O Oskar Karpiński

CV / Professional profile

Fullstack developer for web products, mobile apps, and backend systems

I work across backend, web applications, mobile apps, and deployment. I fit best in projects where requirements need to become a working, maintainable product.

Strongest areas

Where I can create value quickly

I do not treat the stack as a keyword list. What matters more is where I can take responsibility and deliver a concrete part of the product.

Backend & API

Designing REST APIs, data models, authorization, integrations, and services with Spring Boot, Ktor, Go, and .NET.

  • Spring Boot
  • Kotlin
  • REST API
  • SQL
  • Docker

Mobile applications

Native Android apps with Kotlin and Jetpack Compose, plus cross-platform solutions when the product calls for them.

  • Kotlin
  • Jetpack Compose
  • Material 3
  • Flutter

Web & frontend

Fast websites, panels, forms, and web applications with attention to UX, SEO, and maintainable code.

  • React
  • Astro
  • Next.js
  • Tailwind CSS

Deployment & maintenance

Docker, CI/CD, Linux, basic automation, and preparing projects so they can keep evolving after launch.

  • Docker
  • Linux
  • GitHub Actions
  • CI/CD

How I work

How I work in a project

  • Independence in requirements analysis, scope planning, and implementation ownership.
  • Experience working across the full application surface: UI, APIs, backend, data, deployment, and maintenance.
  • Clear communication around risks, technical dependencies, and product trade-offs.
  • A product-minded approach: I choose solutions for the goal, team, and project stage.
  • Code written with future development, handoff, and maintenance in mind.

Want to talk about working together?

Reach out if you are looking for a developer for your team, a freelance project, or technical support for an existing product.