Publication
Caching and Connection Handling in .NET: An Aspect-Oriented Programming Tutorial
https://www.toptal.com/developers/dot-net/aspect-oriented-programming-tutorial
Marko is available for hire
Hire MarkoMarko Pađen
Verified Expert in Engineering
.NET Developer
Berlin, Germany
Toptal member since August 13, 2019
Bio
Marko has over a decade of experience with large-scale software including architecture, design, coding, testing, documentation, build, and release. He's held a variety of roles throughout his career such as software engineer and architect, technology lead, full-stack developer, scrum master, QA mentor, and DevOps engineer.
Portfolio
Leading Telecommunication Company
.NET, Blazor, Redis, RabbitMQ, Elasticsearch, MariaDB, Azure, Kubernetes...
Wegmans
Azure, Oracle PL/SQL, C#.NET, Azure Blob Storage API, Azure Functions...
Marketing product
.NET, Blazor, Azure, Kubernetes, RavenDB, SQL, Azure Kubernetes Service (AKS)...
Experience
- .NET - 19 years
- SQL - 18 years
- Redis - 7 years
- Test Automation - 7 years
- Elasticsearch - 7 years
- Azure - 6 years
- Amazon Web Services (AWS) - 2 years
- Angular - 2 years
Preferred Environment
Azure, .NET Core, Azure DevOps
The most amazing...
...design and implementation I did was critical parts of DNS ENUM server with UDP load balancer. It's auto-scalable in containerized environment and low latency.
Work Experience
Full-stack Developer
2022 - PRESENT
Leading Telecommunication Company
- Developed payment integrations with Chargebee and Stripe.
- Built multi-tenant CI/CD deployment on Azure DevOps and Kubernetes.
- Coordinated team efforts on the entire front-end, back end, and DevOps development effort.
Technologies: .NET, Blazor, Redis, RabbitMQ, Elasticsearch, MariaDB, Azure, Kubernetes, Azure DevOps
Senior Developer | Enterprise Finance Ops
2023 - 2024
Wegmans
- Developed and maintained code and pipeline for internal financial products.
- Developed new financial services for Azure event-driven workflow.
- Updated and supported legacy applications with the latest frameworks/security patterns.
Technologies: Azure, Oracle PL/SQL, C#.NET, Azure Blob Storage API, Azure Functions, Azure Event Hubs, Oracle, Microsoft Data Transformation Services (now SSIS), SQL Server Integration Services (SSIS), C#, .NET, SAP, Azure Queue Storage, PL/SQL, PL/SQL Tuning, YAGNI, DRY, Clean Architecture, Azure Blobs
Full-stack Developer
2022 - 2023
Marketing product
- Developed Blazor server admin portal and MediatR-based back-end service.
- Established the integration with many marketing providers with recurring Hangfire jobs.
- Worked with multi-stage AKS CI/CD with disposable environments.
Technologies: .NET, Blazor, Azure, Kubernetes, RavenDB, SQL, Azure Kubernetes Service (AKS), Hangfire, Redis, MediatR
Senior .NET Full-stack Developer
2021 - 2022
Communauto, Inc
- Implemented and tested modern security patterns for legacy applications.
- Upgraded front-end frameworks to the latest version with many braking changes.
- Tested the entire IT system for security vulnerabilities, including web and REST.
Technologies: .NET, .NET Core, Active Server Pages (ASP), ASP.NET Core, ASP.NET MVC, REST, SQL, SQL Server 2015, Bootstrap 3+, NPM, jQuery, JavaScript, TypeScript, HTML, CSS, Web Security
Senior Back-end Developer
2020 - 2021
Leading Content SaaS Company
- Developed API integrations with official regulators worldwide.
- Developed event-based fast data processing services.
- Worked on improving code quality by centralizing and organizing documentation and standards.
Technologies: .NET, C#, Azure, Azure Table Storage, Azure DevOps, TeamCity, NuGet, Angular, Azure Service Bus, REST, API Integration
Senior Full-stack Developer
2020 - 2020
Gemini Diversified Services
- Worked on new and existing features in a client-facing Angular application on the front and back end (REST MVC Web API).
- Developed new features for the back-office portal in .NET MVC with Entity Framework over an Azure SQL database.
- Implemented CI/CD with SonarCloud static code analysis, gated pull request, and automated policy-based deployment in Azure DevOps.
- Maintained and improved multiple Azure deployments, including orchestrated deployments, network, and security.
Technologies: SQL, Azure, Angular, .NET
Lead Developer
2019 - 2020
Online Coaching Portal
- Managed and led a team of four developers working on an online coaching platform.
- Worked as front-end, back-end developer, and DevOps. Implemented Twilio WebRTC and Stripe Connect integrations as well as SignalR chat and notification system.
- Developed CI/CD with continuous testing and disposable Azure environments.
Technologies: .NET, ASP.NET, REST, SignalR, Vue, Twilio Programmable Video, Twilio API, Azure, Azure SQL, Azure DevOps, Azure Resource Manager (ARM), Stripe Connect
.NET/Angular Developer
2019 - 2020
Most Investments, LLC Pantheon Software
- Worked on ASP.NET core REST API, backed with Entity Framework and Microsoft SQL Server.
- Worked on Angular front end with Bootstrap and SurveyJS controls.
- Implemented functional JMeter testing for REST API.
- Implemented Jasmine/Karma UI tests.
- Improved Docker setup.
Technologies: Amazon Web Services (AWS), Docker, Microsoft SQL Server, SurveyJS, ASP.NET Core, Entity Framework Core, Angular, C#, .NET
Technology Team Lead - External
2019 - 2019
Roche
- Worked as the tech lead for a project that had Angular in the front end and .NET Core in the back end.
- Developed custom control to fit our current project, and also worked on architectural tasks like HTTP client mocking, build-time configuration, code coverage CI integration, and similar.
- Developed REST API with all the best practices, large file uploads, Azure hosting, and so on.
- Set up CI/CD and Terraform Azure environment creation.
Technologies: Terraform, Azure DevOps, Azure Blob Storage API, Azure Stream Analytics, Azure Event Hubs, Azure, Azure Cosmos DB, Web API, Jasmine, Angular, C#, .NET Core, .NET
Head of Software Development
2018 - 2019
Mitto
- Collaborated with team members on technically and domain challenging tasks.
- Led conversations with the team regarding technology usages and improvements.
- Set up CI/CD according to our internal process. This included release management, testing, development, disposable environments, and nightly builds.
- Developed custom DNS UDP ENUM load balancer used in auto-scalable environments in the cloud.
- Developed custom Prometheus integrations that work well on auto-scalable environments.
Technologies: Amazon Web Services (AWS), PostSharp, jQuery, Kendo UI, Git, TFS, Windows PowerShell, NUnit, Selenium, SoapUI, Apache JMeter, Azure, RabbitMQ, Redis, Elasticsearch, MySQL, .NET Core
Senior Software Engineer
2015 - 2018
Mitto
- Acted as the full-stack developer on https://www.nimbow.com/. Made some interesting features, like auto-extraction of uploaded Excel files of any structure.
- Served as the technology lead on Number Lookup Services. Developed a performant lookup system.
- Designed system improvements to migrate from the data center. In the cloud, we achieved 2,000/s requests served with less than <100ms. The pure time of our system was <20ms, the rest of 80ms was an external dependency.
- Introduced AOP practices based on static proxy and IL weaving to solve problems like DB connection pool management (cluster-ready), generic caching, RPC calls.
Technologies: Amazon Web Services (AWS), PostSharp, jQuery, Kendo UI, Git, TFS, Windows PowerShell, NUnit, Azure, RabbitMQ, Redis, Elasticsearch, MySQL, .NET Core
Senior Software Developer
2012 - 2015
IGT
- Contributed to full-stack development and testing betting software. Developed an interesting MVVM-based event-driven model for betting views - performant on rendering multiple views on multiple screens.
- Mentored team members on new technologies, like WPF, Postsharp, and similar.
- Presented new technologies in-house during development technology stack improvement program. Had a task of presenting WPF with all the benefits it gets on our use cases.
- Mentored 2nd level support and provided them assistance on remote administration tools developed in-house.
- Developed generic tools for using various POS devices in betting.
Technologies: Keyboards, POS, SoapUI, Apache JMeter, TFS, TeamCity, NAnt, Oracle Coherence, Oracle Database, DB, Oracle, Windows Presentation Foundation (WPF), ASP.NET, .NET
Software Developer
2011 - 2012
IT Excellence
- Created custom Kendo UI-based application that imports Excel with Pivot table and creates proper OLAP cubes used later for ETL processes.
- Developed web and Windows Phone part of the application that is a social network for public issues.
Technologies: Windows Phone, Windows Communication Foundation (WCF), jQuery, Kendo UI, HTML, MDX, Microsoft SQL Server, Microsoft Silverlight, ASP.NET, .NET
Software Developer
2011 - 2012
Best Solution Team
- Developed custom HTML-based controls for ASP.NET (like flex-grid, control alignment helpers).
- Developed MS Office plugins which integrate with our web portal.
- Integrated ActiveX TWAIN controls into our portal.
- Automated MS Office processes with ClosedXML framework.
Technologies: Plugins, Entity Framework, Microsoft SQL Server, ASP.NET
Software Developer
2010 - 2011
LMG Group
- Made XML-based configurable white label web site for selling mobile content (Java games, MIDI ringtones, images, videos).
- Integrated phone model database with auto-detecting features.
- Integrated with mobile providers in a secure way. Handled payments.
Technologies: Microsoft SQL Server, ASP.NET
Software Engineer
2007 - 2010
PR Padjen
- Developed custom TCP/IP application protocol for live distributed ERP work.
- Made imports from many popular small ERP systems used locally (MS SQL, IMB db2, FoxPro).
- Made distributed licensing mechanism with payment portal with admin access.
Technologies: Microsoft Silverlight, ASP.NET, Microsoft Access, Microsoft SQL Server, TCP/IP, VB.NET
Experience
Imperfect Dollop
https://github.com/notmarkopadjen/imperfect-dollopA .NET library that helps the user create distributed in-memory cache.
Useful for serving not-so-time-sensitive data to many clients. It has all the benefits of the in-memory cache with added distributed synchronization.
Useful for serving not-so-time-sensitive data to many clients. It has all the benefits of the in-memory cache with added distributed synchronization.
Azure DevOps Workflow
https://marketplace.visualstudio.com/items?itemName=mitto-ag.workflowI designed a workflow for the Scrum process in Mitto AG. The analysis includes a multi-tenant release process, separate feature deployments, and release tracking. It was a crucial part of the pipeline. I also contributed to the development.
Redis Insights
I developed open-source software while employed at Mitto AG. The purpose is to get more insights into the Redis instance. This includes the distribution of the keys per pattern based on a random sample (configurable).
CodinGame Member
https://www.codingame.com/profile/7d385fb020073138ae675a9b4c82a42e5463662Part of challenging algorithm problem-solving community.
ID: not_marko_padjen
ID: not_marko_padjen
Number Lookup
Technology/team lead.
Nimbow
Enterprise SMS sending portal.
Full-stack developer, part of a larger team.
Full-stack developer, part of a larger team.
Sports Betting
Full-stack developer, part of a larger team.
Education
2011 - 2012
Master of Science Degree in Informational Systems and Technologies
Faculty of Organizational Sciences - Belgrade, Serbia
2003 - 2011
Bachelor of Science Degree in Informational Systems and Technologies
Faculty of Organizational Sciences - Belgrade, Serbia
Certifications
NOVEMBER 2017 - PRESENT
Professional Scrum Master I
Scrum.org
FEBRUARY 2017 - PRESENT
Elasticsearch Developer I
Elastic
FEBRUARY 2016 - PRESENT
Galera Cluster for MySQL and MariaDB training
FromDual
JANUARY 2014 - JANUARY 2016
Microsoft Certified Solutions Developer: Windows Store Apps Using C#
Microsoft
DECEMBER 2013 - PRESENT
Microsoft Specialist - Programming in C# Specialist
Microsoft
DECEMBER 2013 - PRESENT
Microsoft Certified Professional
Microsoft
Skills
Libraries/APIs
Entity Framework, Windows Forms (WinForms), REST APIs, Vue, Web API, Azure Blob Storage API, SurveyJS, jQuery, XNA, SignalR, Twilio API, Stripe Connect, MediatR
Tools
xUnit, Microsoft Unit Tests, TFS, Git, Apache JMeter, NAnt, PostSharp, RabbitMQ, SoapUI, Keyboards, Microsoft Silverlight, Microsoft Access, Terraform, Oracle Coherence, TeamCity, ActiveMQ, NuGet, Twilio Programmable Video, Jira, NPM, Azure Kubernetes Service (AKS), Hangfire
Languages
Java, C#, SQL, HTML, HTML5, VB.NET, JavaScript, TypeScript, CSS, UML, MDX, Go, Active Server Pages (ASP), C#.NET
Frameworks
ASP.NET Web API, .NET, .NET Core, NUnit, Blazor, SpecFlow, ServiceStack, ASP.NET, ASP.NET Core 2, ASP.NET MVC, ASP.NET Core MVC, Kendo UI, Kendo UI MVVM, Selenium, Angular, Windows Presentation Foundation (WPF), Bootstrap, Jasmine, Entity Framework Core, ASP.NET Core, AWS HA, Ext JS, Windows PowerShell, Cypress, Bootstrap 3+
Paradigms
Azure DevOps, Object-oriented Design (OOD), Microservices Architecture, Load Testing, Design Patterns, Agile, Test Automation, Object-oriented Programming (OOP), Scrum, AOP, Dependency Injection, Microservices, REST, Inversion of Control (IoC), DevOps, Aspect-oriented Programming (AOP), YAGNI, DRY, Clean Architecture
Storage
MySQL, Redis, Microsoft SQL Server, Elasticsearch, Azure Cosmos DB, Databases, RavenDB, DB, Azure Table Storage, Azure SQL, MariaDB, Oracle PL/SQL, SQL Server Integration Services (SSIS), Azure Queue Storage, PL/SQL, Azure Blobs
Platforms
Amazon Web Services (AWS), Docker, Azure, Azure PaaS, iOS, Azure Event Hubs, Oracle Database, Windows Phone, Oracle, Kubernetes, Microsoft, Azure Functions
Other
Visual Studio Team Services (VSTS), Release Management, APIs, Galera Cluster, WCF Web Services, IT Recruitment, Web Applications, Team Leadership, Containerization, Network Protocols, Orchestration, Office Plugins, Algorithms, Patterns, Cloud, Azure Stream Analytics, Plugins, Windows Communication Foundation (WCF), TCP/IP, DevExpress, POS, Azure Service Bus, API Integration, Azure Resource Manager (ARM), SQL Server 2015, Web Security, Fuzzy Logic, Neural Networks, Software Engineering, Software Integration, Network Engineering, Systems, Statistics, Mathematics, Operational Control, Windows Store, Microsoft Data Transformation Services (now SSIS), SAP, PL/SQL Tuning
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