Senior Backend Kotlin Developer (JetBrains AI Platform LLM)

Senior Backend Kotlin Developer (JetBrains AI Platform LLM)

At JetBrains, our mission is to make professional software development more productive and enjoyable. We are dedicated to continuous innovation and excellence, providing solutions that empower developers and teams to help shape the future of technology. Our products are designed to address the complex needs of software developers, data scientists, and other IT professionals, ensuring they can work more efficiently and effectively.

We are developing a microservice platform that provides AI capabilities to all JetBrains products. Through a unified cloud‑based API, our products can access models from external providers (OpenAI, Anthropic, Google, and others), as well as JetBrains’ own text and code models.

We are looking for a Senior Backend Kotlin Developer to join our team.

In this role, you will:

• Work on existing support for large language models (LLMs) and introduce support for new ones, including those from top‑tier providers like OpenAI, Anthropic, and Google.
• Develop various APIs on top of LLM features.
• Engage with external LLM providers and internal clients.
• Review code written by colleagues and provide valuable feedback during architecting sessions.
• Maintain the service to ensure server stability.

We will be happy to have you on our team if you have:

• Experience in JVM server and microservice development.
• A deep understanding of popular frameworks, such as Ktor or Spring.
• The ability to write clean code that is easy to read and support.
• Knowledge of modern concurrency practices.
• Strong teamwork skills, with the willingness to listen to diverse opinions and the ability to support your points with sound reasoning.
• The ability to work in a self‑organized manner.
• Proficiency in English, both written and verbal.

We would be especially thrilled if you:

• Have previous experience working with LLMs.
• Professionally worked with Kotlin, Ktor, and Kotlin coroutines.
• Can combine working on routine tasks with creative thinking, such as analyzing incoming information, clarifying details, suggesting alternative solutions, and evaluating and choosing the most appropriate technologies to solve a given problem.
• Have prior experience building with Gradle.
• Are passionate about learning new things and trying new approaches.

Our technological stack includes:

• Kotlin Multiplatform/JVM, coroutines, and Gradle.
• Ktor.
• AWS (both ECS and EKS) and GCP.
• GitHub and TeamCity.
• Redis, Exposed, and RabbitMQ.

Team

JetBrains AI

Locations

Netherlands (Amsterdam)

Poland (Warsaw)

United Kingdom (London)

Benefits and perks

Depending on office facilities and local market rules

• Fascinating work in a friendly team.
• 30 days of paid vacation (local regulations apply).
• An office library with specialized work‑related books and magazines.
• A comfortable working environment, ergonomic workstations, a gym and leisure facilities, and a range of commuter benefits.
• Excellent opportunities for professional and personal development, including travel to professional conferences worldwide, access to the LinkedIn Learning platform, and more.
• Additional benefits include: lunch, free refreshments, and snacks provided in the office, and much more.
• Hybrid work from your home in any location where JetBrains' offices are

Diversity & Inclusion

At JetBrains, we believe that the best ideas come from diverse perspectives, experiences, and talents. We are committed to fostering an inclusive environment and encourage candidates from all backgrounds (e.g. sex, gender identity or expression, race, ethnicity, national origin, sexual orientation, disability, age, and religion) to apply.

We want you to have a great experience throughout the hiring process – please let us know if you require any accommodations, so we can best support you!

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