Oliwier

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Projects

Selected work.

KSeF Importer

Co-founder / Full-stack · FastAPI · PostgreSQL · Redis · KSeF v2

A focused web app for creating and sending invoices online through Poland’s National e-Invoice System (KSeF). A family member who is an accountant was overwhelmed by the new KSeF requirement, and existing tools were either too complex or extremely expensive. Together with my brother we built something that does one job and does it well. This is my most meaningful project — I could really help someone close to me with something that was weighing them down. After more than six months of intense development and feedback from the first user, we launched publicly. Today it serves many active users.

Knoa

Solo · Next.js · PostgreSQL · AWS EC2 · Docker

Knoa is a private Spanish learning app I built to combine language study with hands-on AWS practice and working on real servers. I always wanted to go beyond English, but I lacked a tool I could use from anywhere. Another motivation was slow days at work — instead of doomscrolling, I wanted something useful. Duolingo felt too slow compared to learning from books, so I scanned my entire book, loaded the sentences into the app, and built my own tool for fast, targeted practice. The project covers a full stack (Next.js, PostgreSQL) and a production deploy on AWS EC2 with Docker.

Contact

Happy to talk about collaboration or a new project.

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