Marcin Kowalczuk

The goal of the project was to build a Windows Application (WinForms) that would read loads of data from the API, process/convert it according to certain rules, store the processed data in a new SQL Server DB instance, create its backup and store it on a hard drive.

It also exposed an interface which allowed the operator to choose/filter data from the API.

Worked on it alone. Full success.

The goal of the project was to create a smart app (web and mobile) that makes the registration of working hours much simpler and more convenient.

I designed and built the architecture of the web application (and API behind the mobile app). I was a back-end developer (and a deputy front-end developer) in this project for around two years.

What was particularly interesting about that project was a number of 3rd party integrations it had. It read/wrote data to (among others):
- Microsoft Graph API
- Google Calendar and Gmail
- various bookkeeping tools
- various project management tools
- various file formats, like Excel or iCal

I was a C#/WinForms developer in a medium-size team for a project that started many years earlier.

My task was primarily to implement new functionalities or modifications according to requirements provided by business analysts.

During this project, I also spent a lot of time working on implementing advanced SQL Server Stored Procedures as well as on optimizing existing ones. I learned a lot about execution plans, query analyzers, optimization hints and other ways of measuring and improving database performance.

The goal was to create a highly personalized feature-rich eCommerce platform.

I joined the project when it was already a few years old. The code was bloated and the business logic resided partially in c# code and partially in SQL database's Stored Procedures.
My role was to re-architecture the front end part and rebuild it from old .aspx to fresher asp.net MVC, which I did.
In addition to that, I was responsible for running the solution on a back-then new Windows Azure - I was the first one in my company who used it as a hosting platform.

When I joined this project it had a huge technical debt. The goal was to make it understandable and usable for the rest of the team that I was leading and then to take over its maintenance and further development.

Together with my team, we introduced a suite of automated functional tests (Selenium). We refactored certain parts of the application and (among others) introduced the 3-tier architecture (which wasn't there earlier).

I took over the maintenance part pretty smoothly and after a relatively short time was able to start introducing new features, fixing bugs, or adjusting existing features.