Oskar KarpińskiFull-stack Developer · Radom, Poland · PL / EN
I'm Oskar Karpiński. For companies I build business websites, web applications and backends — from interface and content, through APIs and integrations, to production deployment. No agency, no passing responsibility around.
Track record
01Projects
Projects showing how I work: a production sales platform, a growing e-commerce codebase, a fully open technical project and a native mobile app.
01Full-stack platform · PL / NO
One sales system for two markets
02Commercial project
Developing and securing a live marketplace
03Open-source project
Android app, backend and encrypted synchronization
04Android app · Kotlin
Native app with grades and timetable
A lightweight, modern mobile app that lets students conveniently check grades, their timetable and homework, while also communicating efficiently with teachers.
02Services
I build business websites, web applications and backends, or take over a focused module: interface, API, integration or deployment. The scope starts with the business goal, not a technology list.
03Process
Clear and concrete: first the goal and scope, then the technology. You see working results at every stage.
We map your offer, customers, current website or system, and the outcome that should change. Afterwards you get a concrete scope proposal.
I split the project into stages: what ships in version one, what comes later, which integrations, which risks. No scope inflation.
I work in stages and show working flows for testing. I don't disappear for a month promising it 'will be ready'.
Release, production configuration and documentation. I can stay for further development or prepare the project for handoff.
04FAQ
Short and straight. If your question isn't here, write to me — you'll get a concrete answer.
Small and medium companies that need a business website, a web application or a backend — from scratch or as an extension of an existing system. I work solo, so I take on projects one person can genuinely deliver.
As a rule of thumb: a simple business website takes 1–3 weeks, a web app or dashboard 3–6 weeks, larger systems are split into stages. After the first call you get a concrete timeline for your scope.
Every project is quoted individually after a short call — based on scope, integrations and timeline. You get a clear per-stage breakdown instead of a number from nowhere.
Yes. That's how I run RudaKlara.pl — taking over from a previous developer without stopping sales: marketplace integrations, security and infrastructure costs. I start with a code audit and a safe-change plan.
I can stay for further development or prepare the project for handoff: documentation, key-flow tests, Docker configuration. I don't lock your company to me.
Yes, on the technical side: fast loading, responsiveness, accessibility, metadata and Google-ready structure. I don't run ad campaigns.
I settle projects through the Useme platform. For larger projects we sign a contract on the platform, which issues you a full VAT invoice. For smaller jobs, issuing the invoice alone is possible, without signing a contract.My Useme profile
Contact
Three short steps — it takes two minutes. The more concrete your description, the sharper my proposal, usually within 24 hours.
Fill in the form — I usually reply within 24 hours.
I'll get back to you, usually within 24 hours, with a concrete scope proposal and a next step.
