- 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
- Strong understanding of the domain you've been working with
- 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

Preferable
- JVM development experience down to the implementation details of the Java standard library
- Strong understanding of the domain you've been working with
- 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.
Why join JetBrains?
- Strong base salary. We offer competitive pay that reflects your skills and experie

📌 Staff Software Developer (Madrid)
🏢 JetBrains
📍 Madrid