Fullstack Machine Learning Developer (Junie)

We build Junie, our AI coding agent, available across JetBrains IDEs and as a standalone CLI. We're combining the latest advancements in AI and LLMs with our decades of software development expertise.

We are working in three main areas: growing Junie CLI into a general-purpose agent independent of any IDE, optimizing model ensembling and setups for the best cost-to-intelligence ratio without compromising code quality, and pushing next-level autonomy so Junie can own, maintain, and evolve entire subsystems over multi-day horizons.

You’ll have end-to-end ownership over these initiatives, taking work from early research to production code while shaping the future of autonomous development.

Day to day, you will:

• Develop and ship new features for Junie across CLI and model integrations.

• Experiment with model setups, ensembling, and cost efficiency strategies.

• Build and test autonomous agent behaviors for long-term project maintenance.

• Own the full development cycle from initial research to production-ready code.

• Use Junie daily to continuously iterate on its quality and user experience.

What you’ll bring

• Comfort taking full ownership of decisions and implementation.

• The curiosity to challenge assumptions and experiment with new ideas.

• The ability to learn new concepts quickly and adapt quickly.

• A mindset focused on long-term impact rather than short-term workarounds.

• Strong interest in autonomous AI systems and software engineering tools.

What you’ll need

• A proven track record of developing and shipping machine learning or full-stack software products.

• Hands-on experience working with LLMs, prompt engineering, or agentic workflows.

• The ability to write high-quality production code across the full development lifecycle.

• Practical experience building or fine-tuning ML models.

What success looks like

In this role, success means taking bold experiments in agent autonomy and cost efficiency and turning them into reliable, production-ready capabilities. You'll know you're succeeding when Junie can tackle complex multi-day engineering tasks autonomously and the tool you build every day actively improves your own engineering workflow.

Why join JetBrains? 

• 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.

*Some benefits may vary depending on location.