Create and maintain foundational libraries for Kotlin core primitives that are used by hundreds of thousands of developers
Become an expert in specific domains of computer science and software engineering
Be part of a design committee that decides how the Kotlin API should be shaped
Participate in creating standard Kotlin tools, specifications and language features
JVM development experience down to the implementation details of the Java standard library
Ability to write design documents for complex systems with strong reasoning behind each trade-off and technical decision
Experience in performance engineering or API design As Part Of Our Team, You Will
Create and maintain foundational libraries for Kotlin core primitives that are used by hundreds of thousands of developers
Become an expert in specific domains of computer science and software engineering
Be part of a design committee that decides how the Kotlin API should be shaped
Participate in creating standard Kotlin tools, specifications and language features




JVM development experience down to the implementation details of the Java standard library
Ability to write design documents for complex systems with strong reasoning behind each trade-off and technical decision
Experience in performance engineering or API design
In general, if you see yourself reading a Unicode standard, exploring how five other languages transform strings to bytes, figuring out why some Oceania islands changed their timezone from -10:00 to +14:00 and whether it should be expressed in the API of Kotlin timezones, optimizing interface hierarchy to be more JIT-friendly and is not afraid of re-iterating over documentation a multitude of times, you won't get bored in our team.
Versátil work location. Enjoy the freedom to work from home or from the office.
Remote work. Spend up to 30 days per year working remotely from abroad.
Extra time off. Medical insurance allowance. Relocation support. Pick up the local language or sharpen your English sk

📌 Staff Software Developer (Madrid)
🏢 JetBrains
📍 Madrid