Kotlin Backend Developer (Kocelot Team, Platform)
Location: Belgrade, Serbia; Berlin, Germany; Limassol, Cyprus; Paphos, Cyprus; Prague, Czech Republic
Department: Kocelot
At JetBrains, code is our passion. Since 2000, we’ve been building the most effective developer tools in the world – tools that automate routine tasks and empower developers to focus on creativity, exploration, and problem-solving.
We’re looking for a Kotlin Backend Developer to join the Kocelot team and help us build the foundation of a new platform for developing domain-specific languages (DSLs).
Kocelot is an experimental project aimed at rethinking how DSLs are designed, analyzed, and embedded into modern applications. The platform combines language definition tools, reactive data processing infrastructure, and a new take on projectional editing – all designed to work seamlessly in web environments. Our goal is to make it easier for teams to build expressive, embeddable languages tailored to their domains.
You’ll be working on the core backend layer: a system that manages structured user data, tracks changes over time, and powers live, incremental processing of language semantics.
As part of our team, you will:
- Design and develop scalable backend services for DSL semantic analysis and execution.
- Work on versioned, structured data storage for reactive data processing.
- Build Kotlin-based SDKs that expose the platform’s capabilities to DSL authors.
- Contribute to a unified graph-based workspace model used across the platform.
- Participate in architectural discussions and long-term technical decisions.
We will be happy to have you on our team if you have:
- Extensive JVM backend development experience.
- Extensive experience with the Kotlin programming language.
- A solid understanding of distributed systems and scalable service design.
- Prior experience with various modern storage technologies (relational databases, key-value stores, graph databases, and/or triple stores).
- Familiarity with event-driven architectures.
- The ability to prototype and iterate quickly in an experimental setting.
- A passion for clean code and maintainable systems.
- The ability to work effectively in a distributed team.
We’ll be especially thrilled if you have:
- Experience with Kotlin Multiplatform.
- Hands-on work experience with compiler plugins or meta-programming.
- Experience building collaborative editing or reactive data systems.
- Experience building DSLs, IDEs, and language processors.
#LI-YY1
We are an equal opportunity employer
We know great ideas can come from anyone, anywhere. That’s why we do our best to create an open and inclusive workplace – one that welcomes everyone regardless of their background, identity, religion, age, accessibility needs, or orientation.
We process the data provided in your job application in accordance with the Recruitment Privacy Policy.
There are more than 50,000 engineering jobs:
Subscribe to membership and unlock all jobs
Engineering Jobs
60,000+ jobs from 4,500+ well-funded companies
Updated Daily
New jobs are added every day as companies post them
Refined Search
Use filters like skill, location, etc to narrow results
Become a member
🥳🥳🥳 452 happy customers and counting...
Overall, over 80% of customers chose to renew their subscriptions after the initial sign-up.
To try it out
For active job seekers
For those who are passive looking
Cancel anytime
Frequently Asked Questions
- We prioritize job seekers as our customers, unlike bigger job sites, by charging a small fee to provide them with curated access to the best companies and up-to-date jobs. This focus allows us to deliver a more personalized and effective job search experience.
- We've got over 200,000 jobs from 15,000+ vetted companies. No fake or sleazy jobs here!
- We aggregate jobs from 15,000+ companies' career pages, so you can be sure that you're getting the most up-to-date and relevant jobs.
- We're the only job board *for* software engineers, *by* software engineers… in case you needed a reminder! We add thousands of new jobs daily and offer powerful search filters just for you. 🛠️
- Every single hour! We add 2,000-3,000 new jobs daily, so you'll always have fresh opportunities. 🚀
- Typically, job searches take 3-6 months. EchoJobs helps you spend more time applying and less time hunting. 🎯
- Check daily! We're always updating with new jobs. Set up job alerts for even quicker access. 📅
What Fellow Engineers Say