Kotlin Backend Developer (Kocelot Team, Platform)

JetBrains; Berlin; Vor Ort; EUR 60.000 - 80.000; Vollzeit

Zusammenfassung

A leading software development company in Berlin is looking for a Kotlin Backend Developer to join the Kocelot team. This position involves designing scalable backend services for domain-specific language (DSL) semantic analysis and building related Kotlin-based SDKs. The ideal candidate should have extensive Kotlin experience, a solid understanding of distributed systems, and a passion for clean code. This role offers a unique opportunity to contribute to innovative projects in an experimental environment.

Qualifikationen

• Extensive experience with Kotlin programming.
• Solid understanding of distributed systems and scalable service design.
• Experience with modern storage technologies.
• Ability to work effectively in a distributed team.

Aufgaben

• Design and develop scalable backend services for DSL semantic analysis.
• Work on versioned, structured data storage.
• Build Kotlin‑based SDKs for DSL authors.
• Participate in architectural discussions.

Kenntnisse

Kotlin programming

Distributed systems

Scalable service design

Event-driven architectures

Prototyping skills

Clean code principles

Team collaboration

Tools

Relational databases

Key-value stores

Graph databases

Triple stores

Jobbeschreibung

Kotlin Backend Developer (Kocelot Team, Platform)

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 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.

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