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Hello, I'm

I am passionate about programming, cybersecurity, and reverse engineering. I enjoy creating modern technological solutions that are not only functional but also efficient and scalable. Exploring systems, analyzing how they work, and finding creative ways to improve them is something that truly fascinates me.

Portrait of Dawid Zygmunt, Fullstack Developer
Skills

I am an full-stack developer with a passion for creating innovative solutions. My skills encompass a wide spectrum of domains, allowing me to work efficiently in both front-end and back-end areas.

Frontend
React Js logoReact Js
Tailwind CSS logoTailwind CSS
Next Js logoNext Js
HTML logoHTML
CSS logoCSS
JavaScript logoJavaScript
TypeScript logoTypeScript
Bootstrap logoBootstrap
Backend
Node Js logoNode Js
Express Js logoExpress Js
Nest Js logoNest Js
.NET logo.NET
Python logoPython
SQL logoSQL
PostgreSQL logoPostgreSQL
MongoDB logoMongoDB
Prisma logoPrisma
Cloud
Bash logoBash
Google Cloud logoGoogle Cloud
AWS logoAWS
Docker logoDocker
CI/CD logoCI/CD
Nginx logoNginx
Kubernetes logoKubernetes
Others
Git logoGit
GitHub logoGitHub
GitLab logoGitLab
VS Code logoVS Code
Figma logoFigma
Bruno logoBruno
Playwright logoPlaywright
Experience

My front-end skills enable me to create intuitive and aesthetically pleasing user interfaces, while my back-end skills allow me to efficiently manage databases and business logic.

Sii logo
Software Engineer

Sii

March 2025 - Present

I work on business web applications for clients, mostly on the backend in .NET and C#. I build and maintain REST APIs in ASP.NET Core and talk to databases through Entity Framework, so a lot of my work is about designing endpoints, writing the logic behind them and making sure the queries stay fast as the data grows. I also pick up the frontend in React when a feature needs it. On the database side I work with SQL Server and PostgreSQL, from writing queries to preparing migrations when the model changes. Since the projects are long running and worked on by a whole team, I spend a fair amount of time on code review, keeping things consistent and picking up parts of the system written by other people.

Skills:
• .NET • C# • ASP.NET Core • Entity Framework • REST API • React • TypeScript • SQL Server • PostgreSQL
Brainhub logo
Fullstack Developer

Brainhub

April 2024 - August 2024

I worked as a fullstack developer, so I moved between the frontend and the backend depending on what had to be done that week. On the frontend it was mostly React and Next.js with Tailwind, and on the backend I wrote REST APIs in NestJS and Next.js, with Prisma on top of PostgreSQL. Testing was a normal part of the job here, not something added at the end. I wrote tests before the code and covered the important paths with Playwright, which saved a lot of clicking through the app by hand. Releases went through CI/CD pipelines and Docker, so putting out a new version was boring in a good way. I also built a PWA there, which had to keep working without internet and feel like a normal app on a phone. The code lived on GitHub and GitLab, so reviews and merge requests were part of every day.

Skills:
• React • Next • TypeScript • JavaScript • Github • Gitlab • REST API • Tailwind CSS • CI/CD • Docker • Playwright • Test Driven Development • NestJS • Prisma • PostgreSQL • PWA
YNSAT logo
Frontend Developer

YNSAT

January 2022 - September 2023

This was my first job in the industry. I worked on the frontend of Mapiblocks, building the screens people actually use and making sure they were clear and quick to get around. Most of it was Angular and React with TypeScript, and for the mobile version we used Ionic, so the same code ran in the browser and on phones. The layouts had to look right on every screen size, and all the data came from REST APIs, so a good part of the work was handling loading and errors in a way that does not leave the user guessing. The team was international and spread across a few countries, so everything happened in English. That taught me to write clearly and to ask questions instead of assuming I understood the task.

Skills:
• Angular • React • Ionic • TypeScript • Rest API • Github • RWD
Projects

Throughout my career as a full-stack developer, I've had the pleasure of working on a diverse range of projects that reflect my skills and passion for creating innovative solutions. Below are a few projects I've been involved in