AI Coding Agent Engineer

What you’ll do

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.