Paweł Szydziak

PROJECT BRIEF
A set of apps used to collect sports data. Some of these were created from scratch in the newer technology stack, and others required maintenance and development of new features, as they were legacy projects.

I read the referee's guides to implement the most complex sport's rules. This project united my two passions, sports and programming, and I thoroughly enjoyed it every step of the way. I learned a lot about architecture, how the technology works behind the scenes, and how to create a clean desktop product.

STACK

Built an MVVM front-end in WPF and created our MVVM library from scratch, similar to Caliburn.Micro or Prism. I applied the .NET framework as a standard and C# and VB.NET. VB.NET was used mainly for the older projects. I learned to use it on this project. For communication between collection stations, we used ActiveMQ and later RabbitMQ.

OTHER

Delivered the stations' synchronization on a tight schedule and provided data to clients, including performance, event sourcing, and legacy code. The data delivery time was under a strict SLA, so we had to implement it quickly or pay fines for breaching the agreement.

PROJECT BRIEF

A complex application for integrated, independent patient and machine QA. SunCHECK is a software that simplifies complex radiation therapy. The web application is in Vue.js, connected with a legacy part written in JavaScript with Knockout.js, allowing the management of all patients and machine QA in the same place to save time and reduce the likelihood of undetected errors.

SunCHECK is designed to work in secure multitenant architecture on-premises and in the cloud. The project provides possibilities to register a new hospital or even hospital networks in a minimal amount of time with the help of serverless computing.

A big part of the project was oriented around software for devices used to test specialized radiotherapy devices. Devices like Linear Accelerator need settings adjustments every day, as patients' safety comes in the first place.

STACK
Front-end: Vue.js, JavaScript, and Knockout.js
Repository: GitHub with CI/CD
Cloud: AWS
Serverless: Tenant management implemented as serverless Node.js applications
Back-end:NET: Moved the whole project from .NET Framework to .NET 5, WCF for quick communication, SignalR, quick communication with the front-end, REST API, and a personalized database layer

PROJECT BRIEF
An MVP web and mobile application that provides a highly secure fintech way of selling real estate shares. To reduce banking fees, we introduced a solution using Dwolla Wallets. To satisfy the US banking standards, the app used KYC, AML, and an escrow account for transaction verification.

I am quite proud of this project because, as a developer lead, I significantly influenced the choice of the technology stack and the right people to fit into the team. I was challenged with MVP estimation, which was accurate despite the project's complexity.

STACK
Both web and mobile applications shared a common Lerna module to not duplicate business logic. The web app was based on Next.js and React, and the mobile one on React Native.

The back-end was designed as a .NET microservice. The communication between the back-end and front-end was solved with the help of GraphQL. We used third-party solution providers such as Dwolla, Plaid, and North Capital on the back end. Implemented Auth0 for the authentication and authorization layer.

PROJECT BRIEF
A web application that controls a medical appointment management workflow with different flows for various clients and providers.

This project was special to me, as I was the first person on the project, from the POC through MVP till the final release. Holding a back-end tech lead position on a big enterprise project that reached production without any major bugs was a significant achievement for me. I also designed the architecture with the newest technology stack, including React, GraphQL, and .NET Core 3.1, which had been released just a week prior.

STACK
I implemented the business workflows, set up the databases in MongoDB, and integrated .NET Core microservices with a GraphQL API back-end. Set up the database operations with the code-first approach using Entity Framework Core 3. Redis was used not only as a cache but also as a subscription and queue, and we chose Redis because the client was used to it. The whole product was fully Dockerized.

A set of apps used to collect sports data, create new clients in the more recent technology stack, maintain and develop older and legacy ones.

Developing a new feature in spring to watch it in summer on TV during your favorite champions league; it's a great feeling! I read the referee's guides to implement the most complex sport's rules. This project united my two passions, sports and programming, and I thoroughly enjoyed it every step of the way. I learned a lot about architecture, how the technology works behind the scenes, and how to create a clean desktop product.

STACK
Built an MVVM front end in WPF and created our own MVVM library from scratch, similar to Caliburn.Micro or Prism. I applied the .NET framework as a standard and C# and VB.NET. VB.NET was used mainly for the older projects, and I learned to use it on this project. For communication between collection stations, we used ActiveMQ and later RabbitMQ.

TEAM
International scrum team of seven.

OTHER
Delivered the stations' synchronization on a tight schedule and provided data to clients, including performance, event sourcing, and legacy code. The data delivery time was under a strict SLA, so we had to implement it quickly or pay fines for breaching it.

The Toptal React Academy is an exclusive learning program that teaches the React framework to select members of the Toptal network. After a month of study, all graduates are tasked with completing a 30-40 hour final project to build and deliver a React app from scratch.