I'm Jan (but everybody calls me kober) — a frontend developer with more than 10 years of experience building software (mostly in banking, where the apps must be friendly but the rules are not 😅).

Although I occasionally build full applications, my main focus is on SDK development — creating secure, reliable building blocks that other developers depend on (and hopefully don’t curse too much).

• Develop and maintain SDKs
• Occasionally build applications using those SDKs (dogfooding is a lifestyle)
• Lead a small team of developers on a daily basis
• Interview developer candidates and help shape the team
• Communicate with customers and handle technical support for the products I develop
• Manage and maintain CI/CD pipelines across different environments

• iOS
• Android
• Flutter
• React Native, Cordova
• Web (React/CSS/HTML)

• Swift, Kotlin, Typescript
• Java, Objective-C
• C, C++
• Bash (for all those mysterious scripts nobody wants to touch)

• Azure DevOps
• GitHub Actions
• Jenkins
• TeamCity

“Jan once fixed a race condition by just staring at the code until it felt ashamed and corrected itself.
10/10 would let him review my PRs again.”
— Definitely Not a Backend Developer

“Our SDK had 327 issues. Jan touched it once, and suddenly it had only 326 issues. Incredible progress.”
— Senior Architect of Unknown Purpose

“Working with Jan is like having a senior developer, support engineer, and stand-up comedian all in one.
He explains complex things simply, jumps in to help anytime, and somehow keeps the team laughing during production outages.”
— Developer that is no longer working with Jan