Staff Software Developer (Kotlin Libraries)

JetBrains
Amsterdam, Netherlands
10 days ago
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Role details

Contract type
Permanent contract
Employment type
Full-time (> 32 hours)
Working hours
Regular working hours
Job source

Tech stack

Java (Programming Language) Application Programming Interfaces (APIs) Software Design Documents Java Virtual Machine (JVM) Software Engineering Kotlin Information Technology Api Design

Job description

  • 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

Requirements

  • 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.

Benefits & conditions

  • Strong base salary. We offer competitive pay that reflects your skills and experience.
  • Flexible 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. More days to relax, recharge, and do the things you love.
  • Medical insurance allowance. Enjoy peace of mind for you and your family
  • Learning and development opportunities. Access to conferences, courses, and language classes.
  • Relocation support. We help make your move as smooth and stress-free as possible. (keep if relevant for the role)
  • Language classes. Pick up the local language or sharpen your English skills.
  • Fuel your day. Enjoy a hot meal or receive a lunch allowance on workdays.
  • Mental health support. To help you feel your best, we provide easy access to professional mental health services.
  • Sports benefit. Enjoy an on-site gym or sports club stipend.
  • Internal events. Join company-wide celebrations and team gatherings.

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Good distractions

Talks and stories from around this role — technically off-topic, practically not.

1:16 min

Designing cross-platform APIs with team collaboration

Andrea Della Porta Andrea Della Porta · World Congress 2026 Europe

3:09 min

Understanding Kotlin Multiplatform and its compiler targets

Petar Marijanović · LIVE

3:10 min

Understanding the core concepts of API design

Alen Pokos · LIVE

1:22 min

Understanding software engineering as more than just coding

Lilia Gargouri Lilia Gargouri · World Congress 2026 Europe

3:01 min

Introduction to Kotlin and Java interoperability

Christian Woerz · LIVE

2:15 min

Developing front-end client applications using Kotlin Multiplatform libraries

Mario Bodemann Mario Bodemann

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