Jakub is available for hire
Hire JakubJakub Pilecki
Verified Expert in Engineering
Architect and Full-stack Developer
Gdańsk, Poland
Toptal member since April 17, 2017
Bio
Jakub is a software architect and hands-on CTO with 21 years of experience building products from idea to production. He delivers practical AI features using RAG, output testing, and cost-aware model selection. He has built platforms serving 600+ U.S. healthcare providers and 100,000+ users, led teams of 20, and managed migrations of 10 million records. He combines technical leadership with hands-on engineering to deliver reliable systems.
Portfolio
coLAB Impact / coVERVE
.NET, C#, PostgreSQL, Redis, RabbitMQ, Entity Framework, Docker, Azure...
Advanced Metrics
C#, ASP.NET Core, RabbitMQ, Entity Framework Core, OData, Kubernetes, GraphQL...
DoNotCopy
C#, PostgreSQL, Redis, RabbitMQ, Entity Framework Core, Docker...
Experience
- Software Engineering - 20 years
- SQL - 20 years
- Architecture - 20 years
- C# - 15 years
- .NET - 15 years
- API Architecture - 12 years
- Docker - 9 years
- .NET Core - 7 years
Work Experience
Chief Technology Officer | Solution Architect | Co-founder
2025 - PRESENT
coLAB Impact / coVERVE
- Defined coVERVE’s architecture and wrote its core application code, taking the product from concept to a live release in six months.
- Built OpenAI-based RAG pipelines that turn surveys and documents into stakeholder reports and improvement plans; engineered prompts, confidence tests, and task-specific model selection to control quality and cost.
- Led a three-person engineering team and owned delivery priorities, code quality, security, and technical debt.
Technologies: .NET, C#, PostgreSQL, Redis, RabbitMQ, Entity Framework, Docker, Azure, Kubernetes, GraphQL, Software Architecture, Technical Leadership, ASP.NET Core, Python, Unit Testing, Artificial Intelligence (AI), Prompt Engineering, Claude, Large Language Models (LLMs), TypeScript, .NET Aspire, Microservices Architecture, API Design, OpenAI, Retrieval-augmented Generation (RAG), GraphQL API, Global Business, Full-stack Design, Database Schema Design, Design Leadership, New Products Strategy, Azure Kubernetes Service (AKS), Microsoft Copilot, AI Pipeline, ChatGPT Prompts, Claude Code
Chief Technology Officer
2024 - 2025
Advanced Metrics
- Promoted to CTO in June 2024; led a multidisciplinary engineering team of 20 and managed a $500K budget, aligning technical strategy with business priorities.
- Oversaw modernization and migration of 10 million records and five major customers, retiring three legacy solutions.
- Oversaw SOC 2 and HIPAA requirements and participated in audits.
Technologies: C#, ASP.NET Core, RabbitMQ, Entity Framework Core, OData, Kubernetes, GraphQL, Docker, MongoDB, Microsoft SQL Server, Angular, Software Architecture, Technical Leadership, API Design, React, Azure Cosmos DB, HIPAA Compliance, PostgreSQL, Redis, Azure, SOC 2, Team Leadership, Change Leadership
Solution Architect | Co-founder
2023 - 2025
DoNotCopy
- Designed and built the complete MacroTag SaaS platform, owning frontend, backend, databases, and deployment.
- Delivered an MVP within a few weeks, enabling early product validation.
- Implemented security controls aligned with SOC 2 and ISO 27001 expectations and designed data-protection and resilience measures.
Technologies: C#, PostgreSQL, Redis, RabbitMQ, Entity Framework Core, Docker, Microservices Architecture, REST APIs, Database Design, ASP.NET Core, SOC 2, ISO 27001, OpenID Connect (OIDC), OAuth 2, Linux, Full-stack Design, New Products Strategy, OAuth
Solution Architect | Lead Full-stack Engineer
2019 - 2025
Recoveri Tag What's Yours
- Rebuilt the platform end to end in approximately six months, from the Angular frontend and .NET microservices to identity, databases, infrastructure, and delivery pipelines.
- Implemented Volkswagen, eNatis, and other vendor integrations and maintained a 99.9% SLA over seven years.
- Supported growth to 541 client organizations, 114,981 users, and 1,345,486 registered vehicles.
Technologies: C#, Entity Framework Core, Docker, RabbitMQ, Angular, CI/CD Pipelines, API Integration, Single Sign-on (SSO), Azure Cosmos DB, OpenID Connect (OIDC), ASP.NET Core, TypeScript, PostgreSQL, CouchDB, Kubernetes, Azure DevOps, Jira, GitHub, OAuth 2, DevOps, APIs, Azure Cloud Services, Back-end Development, Distributed Systems Solution Architecture, Back-end APIs, Identity, OAuth
Director of Technology | Solution Architect
2023 - 2024
Advanced Metrics
- Promoted to Director of Technology in July 2023 and led a multidisciplinary engineering team of 10.
- Aligned product delivery, customer migration, and legacy retirement with senior leadership.
- Owned Qualo’s architecture and core services for a platform adopted by 600+ U.S. healthcare providers.
Technologies: C#, ASP.NET Core, PostgreSQL, Redis, RabbitMQ, Docker, Kubernetes, Azure, GraphQL, Software Architecture, Technical Leadership, Team Leadership, Agile Leadership
Lead Software Development Engineer | Solution Architect
2020 - 2023
Advanced Metrics
- Designed Qualo’s architecture and implemented core libraries and services for a healthcare SaaS platform.
- Built reusable dynamic forms, OData, messaging, notification, and event services used across the application suite.
- Led Healthy Pathways development and coordinated frontend delivery, helping launch the new product in approximately one year.
Technologies: C#, ASP.NET Core, PostgreSQL, Redis, RabbitMQ, Docker, Azure, GraphQL, OData, Angular, Software Architecture, API Design, Jira, Scrum, OWIN, Docker Compose, .NET 6, Azure Cloud Services, Back-end as a Service (BaaS), Next.js, Azure Functions
Lead Mobile Developer | API Integration Engineer
2020 - 2021
Depoway
- Built and maintained the iOS and Android mobile applications using Xamarin.
- Implemented integrations with banks, financial-rating providers, and payment gateways.
- Led mobile delivery as part of the founding team and worked directly on core product integrations.
Technologies: C#, Kotlin, Xamarin.Forms, Xamarin.iOS, Xamarin.Android, Xamarin, Android, API Integration, Payment Gateways, Unit Testing, iOS, REST APIs, Xcode, MacOS
Solution Architect | Lead Full-stack Developer
2020 - 2020
General Technology
- Architected and built Visiting Teachers’ backend and frontend with .NET Core and Angular.
- Replaced legacy Microsoft Access workflows while preserving compatibility with the existing data model.
- Designed a plugin system for customer-specific extensions without maintaining separate product forks.
Technologies: C#, .NET Core, Entity Framework Core, Angular, TypeScript, Microsoft SQL Server, Solution Architecture, SAML, HTML, CSS, OpenID Connect (OIDC), ASP.NET Core, API Design, Visual Studio, Visual Studio 2019, Windows Server
Software and Hardware Engineer
2018 - 2019
Vegan House
- Designed and built Raspberry Pi devices with custom PCBs and device-control software.
- Developed a central management server and delivered Xamarin iOS and Android apps for room access and resort facilities.
- Owned architecture and delivery from hardware and device APIs through application deployment.
Technologies: C#, Internet of Things (IoT), Xamarin, PostgreSQL, Docker, .NET Core, MongoDB, Python, Raspberry Pi, REST APIs, TeamCity
Contracted Senior Software Engineer
2018 - 2018
Payobox
- Built a JavaMoney/JSR-354 currency-exchange microservice for a distributed fintech platform.
- Delivered messaging microservices integrating SendGrid and SMSApi.pl.
- Designed a provider abstraction for future messaging integrations and improved core platform components.
Technologies: PostgreSQL, MongoDB, Docker, REST APIs, Java, Spring Boot, Redis, MinIO, RabbitMQ, Microservices Architecture, API Integration, Scrum, Upsource
Freelance Senior Software Engineer
2017 - 2018
Advanced Metrics
- Built an offline Windows tablet assessment application with synchronization on reconnect.
- Created a reusable WYSIWYG forms editor and refactored legacy modules for maintainability and performance.
- Introduced dedicated synchronization and email/SMS services within the existing application.
Technologies: C#, JavaScript, Entity Framework, ASP.NET, ASP.NET MVC, ASP.NET Web API, Microsoft SQL Server, Universal Windows Platform (UWP), Azure Blobs, HIPAA Compliance, SQL Server Reporting Services (SSRS), Visual Studio, DevExpress
Freelance Senior Developer
2017 - 2017
Recoveri Tag What's Yours
- Implemented mobile image uploads backed by Azure Blob Storage.
- Integrated SendGrid and built the application’s email delivery workflow.
- Reviewed and refactored application flows to improve security, reliability, data handling, and usability.
Technologies: Azure Blob Storage API, Cordova, Node.js, Android, Azure SQL, Entity Framework, Web API, JavaScript, C#, REST APIs, Azure Mobile, Azure SQL Databases, Microsoft Azure Mobile Services
Software Engineer | Full-stack Developer (Contract)
2014 - 2017
UniDoc
- Developed document-management modules and client-specific extensions for Wirtualna Polska, ESV, and Cubatex.
- Built OCR, barcode, and layout-matching workflows for intelligent document intake.
- Delivered an HTML5 PDF invoice viewer and an Android client with offline document access.
Technologies: MySQL, Hibernate, Spring, Java, SOAP, Android, API Integration, HTML, SQLite, JavaScript, Tesseract
Chief Software Engineer
2014 - 2017
inviPay.com
- Joined the early engineering team and co-designed the online factoring platform’s architecture; later served as Chief Software Engineer.
- Owned public REST/SOAP APIs and banking, accounting, and payment integrations; built change tracking, smart-card signing, POS/payment-gateway components, and BIRT reporting.
- Introduced MongoDB alongside PostgreSQL for large-scale external data ingestion and processing, mentored engineers, and resolved critical production issues.
Technologies: Hibernate, JavaScript, Docker, AngularJS, MongoDB, PostgreSQL, Java Message Service (JMS), Spring, Java, SOAP, Software Architecture, API Integration, Technical Leadership, Payment Gateways, REST APIs, Integration, NoSQL, GitHub, APIs, IntelliJ IDEA, Hibernate OGM, Apache Maven, Back-end Development, Back-end Performance, Relational Database Design, Database Schema Design, Back-end APIs
Founder | Chief Technology Officer | Software Architect
2012 - 2016
Syneo.pl
- Acted in the roles of founder, lead programmer, and IT department director.
- Had an impact on all projects done by the company (see portfolio).
- Managed the IT team and projects—created the specifications, designed the architecture, and led the programming efforts.
- Chose the technology stack for each project, advised clients, and closely worked with them on the project.
- Led the technology stack and developed the architecture for each project.
Technologies: C#, Windows, MySQL, Entity Framework Core, JavaScript, AngularJS, Knockout (Knockout.js), Windows Communication Foundation (WCF), Windows Presentation Foundation (WPF), PostgreSQL, Microsoft SQL Server, Java, .NET, REST, C#.NET WinForms, SOAP, Software Engineering, .NET 4, ASP.NET MVC, LINQ, API Architecture, Database Architecture, SQL Management Studio, Visual Studio 2017, SignalR, SQL, Android, Full-stack, Back-end, C#.NET, Databases, WebRTC, Database Design, Architecture, MVC Design, Concurrent Programming, Model View ViewModel (MVVM), Engineering, Computer Engineering, Software Architecture, API Integration, Full-stack Development, Leadership, Agile, Technical Leadership, Agile Software Development, Software as a Service (SaaS), New Products, Strategy, Distributed Systems, Solution Architecture, Entity Framework, Web API, Endpoint Security, Web Development, Payment Gateways, SaaS, RESTFul APIs, ASP.NET Identity, JSON, Relational Databases, API-first Development, Back-end Architecture, HTML, CSS, Windows API, CTO, SQL Server, XAML
Senior Developer
2010 - 2012
UVDesign
- Delivered the company’s .NET, Java, and Objective-C projects.
- Built UVD DataLink for two-way synchronization with offline systems and contributed to Actualizer CMS.
- Developed custom web, desktop, and mobile applications for the company’s clients.
Technologies: C#, Objective-C, Java, .NET, JavaScript, ASP.NET MVC, API Integration, Content Management Systems (CMS), PHP, MySQL, Windows Communication Foundation (WCF), Perl, WinAPI
Owner | Developer
2005 - 2010
Self-employed
- Built custom websites, applications, and portals, owning requirements, implementation, and client delivery.
- Created the Wendigo PHP framework and content management system.
- Delivered a local-news platform deployed in five towns across Poland.
Technologies: JavaScript, Microsoft SQL Server, Database Design, Content Management Systems (CMS), HTML, CSS, PHP, MySQL, Web Development
Project History
coVERVE — AI Assessment and Reporting
https://colabimpact.comcoVERVE helps nonprofit organizations turn assessments into practical improvement plans. I defined the architecture, wrote the core application code, and built OpenAI-based RAG pipelines that transform surveys and documents into stakeholder reports and recommendations. I engineered prompts, confidence tests, and task-specific model selection to control quality and cost. I led a three-person team and delivered the live product in six months.
Qualo
https://qualo.net/I designed Qualo’s architecture and built core libraries, dynamic forms, OData, messaging, notification, and event services. I led engineering delivery through launch and later modernization, customer migration, and legacy retirement as Director of Technology and CTO. The platform was adopted by 600+ U.S. healthcare providers. As CTO, I led a team of 20, managed a $500K budget, and oversaw migration of 10 million records and five major customers.
Recoveri — Vehicle and Asset Security
https://recoveri.netI rebuilt Recoveri’s vehicle and asset security platform end to end, from the Angular frontend through .NET microservices, identity, databases, infrastructure, and delivery pipelines. I delivered the new version in approximately six months, implemented Volkswagen, eNatis, and other integrations, and maintained a 99.9% SLA over seven years. The platform supports 541 client organizations, 114,981 users, and 1,345,486 registered vehicles.
DoNotCopy
https://donotcopy.digital/I designed and built the complete MacroTag SaaS platform, a digital authentication solution for goods and documents, owning frontend, backend, databases, hosting, and delivery. I shipped the MVP within a few weeks and implemented security controls aligned with SOC 2 and ISO 27001 expectations, alongside data-protection and resilience measures.
Project "California" for Vegan House Resort
https://veganhouse.plI delivered a smart-access system for resort guests, owning the complete solution from custom Raspberry Pi PCBs and device software to a central .NET server and Xamarin iOS/Android applications. Guests could use their phones to access rooms and facilities. I also owned the build and deployment pipeline.
Payobox
I developed a JavaMoney/JSR-354 currency-exchange microservice and messaging services integrating SendGrid and SMSApi.pl. I designed a provider abstraction to simplify expansion to additional messaging providers and improved core components of the distributed fintech platform.
Maxwell Home Visiting
I developed core features for Maxwell, a home-visiting platform used by Maryland health and family-support programs. I reviewed and refactored legacy code, improved security and maintainability, and later led development. I built reusable data-collection forms and supported reporting and assessment workflows.
Maxwell Offline Application
I built a Windows 10 UWP tablet application for collecting home-visit assessments offline. I reused forms from the main online system and implemented synchronization when connectivity returned, including the REST API connecting the tablet app to the central platform.
Recoveri | Tag What's Yours (2017)
I improved Recoveri’s client-facing mobile application through code review and security- and performance-focused refactoring. I implemented camera-image uploads backed by Azure Blob Storage and integrated SendGrid email delivery to support vehicle and asset-management workflows.
inviPay — Online Factoring Platform
inviPay was an online factoring platform that helped businesses improve cash flow through invoice financing. I helped design and build it from the early stages, owning public APIs and integrations with banks and accounting systems. I developed change tracking, smart-card signing, reporting, and payment components; introduced MongoDB alongside PostgreSQL for large-scale data processing; and later served as Chief Software Engineer.
FeturaCloud
FeturaCloud is a solution developed for Wesstron. The solution is an ambitious take on an IoT idea.
In cooperation with DTM Systems, we developed the full software and hardware solution for livestock breeding facilities—it allows the automation, monitoring, and live control over those facilities.
The system consists of locally deployed hardware elements such as automatic feeders, water pumps, box gates, and more, along with local supervising SOA software that controls those elements according to preconfigured plans and/or as a response to current conditions (i.e., humidity, temperature, noise, and more).
On top of that, there is a central cloud application that gives control over the systems in those local facilities from any place and provides aggregated reports and other insights.
In this project, I oversaw the R&D process, core architecture design, communication protocols development, team management, and programming for the core elements.
In cooperation with DTM Systems, we developed the full software and hardware solution for livestock breeding facilities—it allows the automation, monitoring, and live control over those facilities.
The system consists of locally deployed hardware elements such as automatic feeders, water pumps, box gates, and more, along with local supervising SOA software that controls those elements according to preconfigured plans and/or as a response to current conditions (i.e., humidity, temperature, noise, and more).
On top of that, there is a central cloud application that gives control over the systems in those local facilities from any place and provides aggregated reports and other insights.
In this project, I oversaw the R&D process, core architecture design, communication protocols development, team management, and programming for the core elements.
Slingshot | Optimes
Slingshot (rebranded as Optimes) is an application for production processes planners.
Its core element is the sophisticated interactive Gantt diagram that presents all past, current, and future actions that makes up any production process from start to end.
The application is created as an ASP.NET intranet central software with satellite components such as Microsoft Reporting Services node for printouts and reports, dedicated Windows Service for long running threads (schedulers, email senders, recalculations, and more).
Its core element is the sophisticated interactive Gantt diagram that presents all past, current, and future actions that makes up any production process from start to end.
The application is created as an ASP.NET intranet central software with satellite components such as Microsoft Reporting Services node for printouts and reports, dedicated Windows Service for long running threads (schedulers, email senders, recalculations, and more).
CloudFlex
DTM Systems is an automation systems manufacturer for whom I developed a web application for their service technicians.
The purpose of this application is to provide a remote tool for the configuration and supervision of deployed systems based on their proprietary CloudFlex hardware. Examples of such systems are automated garage doors, lights, and more that are controlled with remote control by end users.
The CloudFlex application provides unified, remote access to those hardware nodes, registration, and management of remote controllers (also in the form of smartphone applications), the live monitoring of events, and issuing commands from anywhere the technician has a basic internet connection.
The scope of this project was not only pure software architecture and development but also required close cooperation with the client's hardware team in developing the final devices, communication protocols, and more.
The purpose of this application is to provide a remote tool for the configuration and supervision of deployed systems based on their proprietary CloudFlex hardware. Examples of such systems are automated garage doors, lights, and more that are controlled with remote control by end users.
The CloudFlex application provides unified, remote access to those hardware nodes, registration, and management of remote controllers (also in the form of smartphone applications), the live monitoring of events, and issuing commands from anywhere the technician has a basic internet connection.
The scope of this project was not only pure software architecture and development but also required close cooperation with the client's hardware team in developing the final devices, communication protocols, and more.
Flood Simulator
Flood simulator is a module for the client's Natural Threads Prevention platform.
The purpose of this module is to simulate a flood wave transition along a river, described as a semi-graph structure, while taking into account multiple conditions along the way, such as reservoirs, river branches, and more.
Technically the project is divided into three components. At the core is a calculations back end that takes care of all the simulation of the semi-graph. Multiples of those calculation nodes can be deployed and are connected to API back ends via the JMS queue. The API back end serves as a thin entry point for commands and results sent back and forth to the front-end.
The front-end is an HTML/JavaScript application that, by using Knockout.js, is able to visualize calculations on a simplified river map. The map displays the fronts of the waves and the water level at measuring points and provides a control for time travel and playback of the simulation.
The purpose of this module is to simulate a flood wave transition along a river, described as a semi-graph structure, while taking into account multiple conditions along the way, such as reservoirs, river branches, and more.
Technically the project is divided into three components. At the core is a calculations back end that takes care of all the simulation of the semi-graph. Multiples of those calculation nodes can be deployed and are connected to API back ends via the JMS queue. The API back end serves as a thin entry point for commands and results sent back and forth to the front-end.
The front-end is an HTML/JavaScript application that, by using Knockout.js, is able to visualize calculations on a simplified river map. The map displays the fronts of the waves and the water level at measuring points and provides a control for time travel and playback of the simulation.
Distributed Scale Monitoring Service
In cooperation with Kalisto (a manufacturer of industrial scales) and Polskie Sklady Wegla (a coal distribution company), I created software for remote monitoring and data collecting from industrial scales deployed in coal distribution centers across Poland.
This project consists of two parts—the local scale monitoring service that is directly connected to the scale at a distribution center and collects data about the weight of coal trucks that drives through the scales situated at the gates. The centralized web application that enables higher management to monitor all those remote locations.
This project consists of two parts—the local scale monitoring service that is directly connected to the scale at a distribution center and collects data about the weight of coal trucks that drives through the scales situated at the gates. The centralized web application that enables higher management to monitor all those remote locations.
Observer.NET
Optiguard is a leading anti-theft electronics manufacturer in Poland. Their line of products consists of electronic devices that are used in stores to secure displayed merchandise along with proprietary software that enables shop owners to monitor those devices.
The goal of the Observer.NET project was to introduce another layer of that infrastructure—the cloud-based intranet application that gathers data from multiple shops and their devices, aggregates it and displays it in real-time in a web browser. On top of that, it provides remote interaction capabilities with sensors and also historical data browsing and reporting.
The goal of the Observer.NET project was to introduce another layer of that infrastructure—the cloud-based intranet application that gathers data from multiple shops and their devices, aggregates it and displays it in real-time in a web browser. On top of that, it provides remote interaction capabilities with sensors and also historical data browsing and reporting.
Optical Questionnaire Recognition Service
For Infosys Poland, I developed an optical questionnaire recognition service. The main purpose of this internal tool is to handle the batch-processing of scanned hand-filled questionnaires to ease data input procedures.
The application is created as an OWIN-based API service with a REST interface. It utilizes computer vision and layout matching techniques to provide transformation invariant processing of images. The experimental tesseract-based OCR functionality also serves for text recognition for open question fields.
The application is created as an OWIN-based API service with a REST interface. It utilizes computer vision and layout matching techniques to provide transformation invariant processing of images. The experimental tesseract-based OCR functionality also serves for text recognition for open question fields.
Lithium
Lithium is a WebRTC-based communication platform. Its goal is to provide teleconferencing straight from the website without the need to install any plugins or auxiliary software.
The software is split into two components: a back-end service (based on OWIN and SignalR that takes care of data signaling and management of users and chat rooms) and a front-end JavaScript application that needs to be embedded onto the target website by the simple importation of JavaScript scripts and initializing it with a simple function call.
The software is split into two components: a back-end service (based on OWIN and SignalR that takes care of data signaling and management of users and chat rooms) and a front-end JavaScript application that needs to be embedded onto the target website by the simple importation of JavaScript scripts and initializing it with a simple function call.
Unistore Android Application
I developed the Android client for Unistore, enabling users to browse, view, and manage documents stored on the SaaS platform. I implemented local caching for selected documents so users could retain access offline, with layouts suitable for both smartphones and tablets.
Optical Form Recognition Component for UniDoc
I built UniDoc’s intelligent document-intake component using Tesseract OCR, barcode recognition, layout matching, and learning algorithms. The system matched scanned documents to templates and extracted values into electronic forms, reducing manual entry for invoices and other business documents.
UVD DataLink
I built UVD DataLink to synchronize closed offline applications with online services and shops. I designed a plugin-based Windows service that acquired, transformed, and exchanged data through database access, ActiveX integrations, and other interfaces, supporting software without public APIs.
PZWL Catalog
PZWL is one of the largest medical book publishing houses in Poland. For them, I developed a Windows desktop application in WPF technology that was an interactive drugs catalog for students and doctors.
The application was distributed on the CD-ROMs added to books printed by clients and as an online standalone purchase.
The main challenge here was to cope with the large database size that, at the same time, was encrypted but needed to be searched in a fast and efficient manner.
The application was distributed on the CD-ROMs added to books printed by clients and as an online standalone purchase.
The main challenge here was to cope with the large database size that, at the same time, was encrypted but needed to be searched in a fast and efficient manner.
BIG InfoMonitor App
For one of the largest national debtors registries that were a client of UVDesign, where I worked, I developed the Android and iOS application for fast contractor debt checking in InfoMonitor's databases as a part of their Finance Credibility Certificate product line.
Wendigo
Wendigo is a PHP MVC lightweight framework written from scratch to speed the development of secure, object-oriented applications. Its main goal was to be as light and modular as possible, contradictory to other frameworks of that time, such as CakePHP or Symfony, that were monolithic and took hours to install them.
On top of that, there was a Wendigo CMS—a content management system built with the Wendigo framework as a foundation. It was used then in projects such as NetKurier, CentrumGSM, or Wrozka Kindergarten.
On top of that, there was a Wendigo CMS—a content management system built with the Wendigo framework as a foundation. It was used then in projects such as NetKurier, CentrumGSM, or Wrozka Kindergarten.
NetKurier
Based on the Wendigo CMS, I developed a local news portal that was running in five towns across Poland. It consisted of multiple subsites, event pages, blogs, galleries, public bulletin boards, small advertisements, and more.
CentrumGSM
For CentrumGSM, I cooperated with a team on the creation of their online marketplace and online warranty service.
The application was based on the Wendigo framework and used Microsoft SQL as a data store and data logic back end. Microsoft SQL Server use here was dictated by other applications used by clients that relied on RDBMS.
The application was based on the Wendigo framework and used Microsoft SQL as a data store and data logic back end. Microsoft SQL Server use here was dictated by other applications used by clients that relied on RDBMS.
I.R.I.A.
My software engineer bachelor's thesis was focused on the then-emerging multitouch interfaces. I designed and built a full-sized multitouch table that took advantage of the Frustrated Total Internal Reflection phenomenon to detect the user's fingers touching the table's surface.
On the software side, the full low-level driver-like application was developed in Java that took care of recording, analyzing, and transforming input from a camera sensor. Then it translated that to standard Windows mouse cursor movements. Along with that, there was also a demonstration of the photo browsing software.
On the software side, the full low-level driver-like application was developed in Java that took care of recording, analyzing, and transforming input from a camera sensor. Then it translated that to standard Windows mouse cursor movements. Along with that, there was also a demonstration of the photo browsing software.
Blaze
My thesis for my master's degree was about complex data classifiers able to level a concept-drifting phenomenon. For that, I developed my own classification algorithm, Blaze, partially inspired by Kyosuke Nishida's ACE method.
The objective was to create an algorithm that can quickly adjust itself to the concept of drifting without waiting for cutpoints which is a main flaw of all moving window-based classification algorithms.
In certain scenarios, Blaze outperformed well-established algorithms such as ACE, AWE, and ADE.
The objective was to create an algorithm that can quickly adjust itself to the concept of drifting without waiting for cutpoints which is a main flaw of all moving window-based classification algorithms.
In certain scenarios, Blaze outperformed well-established algorithms such as ACE, AWE, and ADE.
Tesseract Box Creator
https://github.com/EvilVir/tesseract-box-creatorA simple application created as a side project that allows you to create and edit Tesseract OCR's learning files to refine them. It was used as part of some OCR projects I did and then released as open source for others to benefit from.
Ninject Autobinding Extension
https://github.com/EvilVir/Ninject.Extensions.AutoBindingThis is an extension of a popular Ninject framework that enables programmers to automatically configure their dependency services by just putting appropriate attributes on service classes. It mimics Spring's @Component annotation.
This is very helpful in larger applications where adding all the dependencies to the container by hand is tedious and hard to maintain.
This is very helpful in larger applications where adding all the dependencies to the container by hand is tedious and hard to maintain.
WiringPI.NET
https://github.com/EvilVir/WiringPi.NETA simple .NET wrapper around Drogon's library WiringPi. It enables the use of Raspberry Pi's GPIO under Microsoft .NET and Mono Framework applications. This is an open-source project used in a variety of other projects.
GPIOTool
https://github.com/EvilVir/GPIOToolA simple mono application for fiddling with RPI's GPIO pins. It runs as a CLI application that gives you a simple list of all the GPIO pins on your board, and then you can change individual pin properties like state, mode, and direction, pool for its state (in read mode), tag them, and more. It is good for simple fiddling and prototyping with Raspberry Pi.
Second Place at Microsoft's Win the Web Competition
As a part of my activities in the .NET group, I participated with two team members in Microsoft's Win the Web Competition. It was a 24-hour ASP.NET programming marathon carried out at Microsoft Poland HQ.
We won 2nd place there, missing 1st place just by a hair after Hewlett Packard's team.
We won 2nd place there, missing 1st place just by a hair after Hewlett Packard's team.
.NET Group Science Club at the University of Technology and Life Sciences in Bydgoszcz
During college, I lectured at a local .NET group. There was a science club, assisted by Microsoft, that was focused on programming technologies from Microsoft.
I carried out multiple lectures and also was the main organizer of 2 IT Academic Days in Bydgoszcz—university events that consisted of lectures by students, professors, local IT companies, and Microsoft employees.
I carried out multiple lectures and also was the main organizer of 2 IT Academic Days in Bydgoszcz—university events that consisted of lectures by students, professors, local IT companies, and Microsoft employees.
Azure IoT Hub Research Side Project
Based on Raspberry Pi 2 and Azure IoT Hub, I prototyped a cloud-enabled application that manages sensors connected to those computers.
Readings from an ambient temperature sensor (DS18B20+) are sent as messages to the device's twin in the hub, and from there, they are consumed via WebSocket and displayed on the sample web application.
Also, communication from the cloud to the device was established using the twin's properties to toggle connected LEDs.
Readings from an ambient temperature sensor (DS18B20+) are sent as messages to the device's twin in the hub, and from there, they are consumed via WebSocket and displayed on the sample web application.
Also, communication from the cloud to the device was established using the twin's properties to toggle connected LEDs.
Home Automation System
With Odroid C1+ and Node.js, I created my home automation system that exposes some equipment, such as computers, lights, and so on, to Apple Home. This enables me to control them via iPhone's Home app and widgets.
Education
2009 - 2011
Master of Computer Science Degree in Engineering (Intelligent Decision Support Systems)
Poznań University of Technology - Poznań, Poland
2005 - 2009
Bachelor's Degree in Computer Engineering
The University of Computer Sciences and Skills in Łódź - Bydgoszcz, Poland
Skills
Libraries/APIs
Entity Framework, LINQ, SignalR, REST APIs, Web API, API Development, WebRTC, Azure Blob Storage API, Xamarin.iOS, Xamarin.Android, Windows API, OpenAI API, Java Message Service (JMS), Node.js, WinAPI, GraphQL API, Back-end APIs, React
Tools
Jira, TeamCity, Docker Compose, SQL Management Studio, RabbitMQ, Ninject, Git, IntelliJ IDEA, Visual Studio 2019, Upsource, Hibernate OGM, Azure Mobile, GitHub, C#.NET WinForms, Codex, Claude Code, Visual Studio, Xcode, Apache Maven, Azure Kubernetes Service (AKS), Microsoft Copilot, AI Prompts, Claude
Languages
C#, SQL, JavaScript, C#.NET, GraphQL, HTML, Java, TypeScript, Python, SAML, CSS, XAML, Perl, Objective-C, Kotlin, PHP
Frameworks
Entity Framework Core, ASP.NET Web API, ASP.NET MVC, Hibernate, ASP.NET Core, Spring, .NET, Mono, ASP.NET, .NET Core, .NET 4, .NET 6, ASP.NET Identity, Windows Presentation Foundation (WPF), AngularJS, Angular, OAuth 2, Next.js, Spring Boot, Knockout (Knockout.js), .NET Aspire
Paradigms
API Architecture, Service-oriented Architecture (SOA), Model View ViewModel (MVVM), MVC Design, Dependency Injection, Concurrent Programming, Microservices Architecture, Microservices, REST, Application Architecture, API-first Development, Back-end Architecture, HIPAA Compliance, Scrum, DevOps, Agile, Agile Software Development, Mobile Development, Unit Testing, Database Design, Azure DevOps
Platforms
Docker, Visual Studio 2017, Windows, MacOS, Universal Windows Platform (UWP), Microsoft Azure Mobile Services, Xamarin, Azure, iOS, Android, Kubernetes, Windows Server, Linux, Azure Functions, Raspberry Pi
Storage
Database Architecture, PostgreSQL, MongoDB, Databases, JSON, Relational Databases, SQL Server Reporting Services (SSRS), Microsoft SQL Server, NoSQL, MySQL, Azure Blobs, Azure SQL, Azure SQL Databases, Azure Cloud Services, Azure Cosmos DB, Redis, CouchDB, SQLite
Other
Engineering, APIs, OWIN, Architecture, Full-stack, Back-end, Software Engineering, Software Architecture, API Integration, Full-stack Development, Software as a Service (SaaS), New Products, Distributed Systems, Solution Architecture, CTO, RESTFul APIs, API Design, Endpoint Security, Web Development, Cloud, Payment Gateways, Scalability, SaaS, Identity, Single Sign-on (SSO), Integration, SQL Server, Customer Data, MinIO, Internet of Things (IoT), Windows Communication Foundation (WCF), Xamarin.Forms, SOAP, CI/CD Pipelines, Leadership, Technical Leadership, Cloud Architecture, Strategy, SOC 2, ISO 27001, OAuth, Communication, Content Management Systems (CMS), OpenID Connect (OIDC), Large Language Models (LLMs), OData, Computer Engineering, Cordova, Tesseract, Global Business, Full-stack Design, Back-end Development, Back-end Performance, Back-end as a Service (BaaS), Relational Database Design, Database Schema Design, Team Leadership, Design Leadership, Change Leadership, Agile Leadership, New Products Strategy, Distributed Systems Solution Architecture, Videos, Artificial Intelligence (AI), Prompt Engineering, AI Pipeline, ChatGPT Prompts, DevExpress, OpenAI, Retrieval-augmented Generation (RAG)
Collaboration That Works
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1
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Work with your chosen talent on a trial basis for up to two weeks. Pay only if you decide to hire them.
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