09/25/2026 updated
KD
100 % available
Senior .NET/C# Dev · AI & LLM Integration · Self-Hosted Infra
Gdańsk, Poland
Only remote
About me
I've been writing C# professionally for 9 years (17 non-professional) and React/Vue depending on the project. These days I mostly focus on applied AI: wiring LLMs into existing or fresh software, tuning inference, and running self-hosted infrastructure that just work :) Creator of ghostfix.quest
AI AgentsJava (Programming Language)Application Programming Interfaces (APIs)C Sharp (Programming Language)Python (Programming Language)Open Source TechnologySAP ApplicationsSystems IntegrationReact.jsVue.jsKotlinRestful Api
- 9 years of production C#/.NET. Services, APIs, architecture, the occasional performance rescue mission,
- AI integration: OpenAI-compatible APIs, llama.cpp, vLLM, GGUF, ChatGPT, Claude,
- Self-hosted infra: Docker, CI/CD, mail and media servers, I run my own production systems and can set yours up so your data doesn't live in someone else's cloud,
- I'm the creator and maintainer of ghostfix.quest, an open source project that revives abandoned but useful repos. 110 repositories, 5,400+ tests added, 112k lines changed, every PR in public. It runs on an agent-assisted pipeline that I scope, review and own end to end, same approach I'd bring to multiplying your team's throughput,
- I'm a one-person team that can deliver working products from start to finish,
- Availability from 6 AM until 10 PM CEST - if something goes down, I will be there.
Experience
Professional experience5 - 10 years
Freelancer since2018
Languages
EnglishFluentPolishNative speaker
Project history
Managing a team of developers, testers and a project manager while also keeping my previous responsibilities of a .NET Developer with recent addition of managing of an in-house AI server
Developing internal tools based on SAP Business One, in a small, in-house team, everybody having their own projects.
My solo projects ranged from full automation of warehouse management, through smart changing room, to various synchronisations between our SAP and other services