{"id":36824,"url":"https://alion.io/job/jetbrains-fullstack-machine-learning-developer-junie","title":"(Senior) Machine Learning Developer (Junie)","company":{"id":58,"name":"JetBrains","domain":"jetbrains.com","url":"https://alion.io/company/jetbrains","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":{"grade":"A","score":94,"open_postings":41,"ghost_share":0,"stale_share":0.049,"repost_share":0,"time_to_fill_p50_days":87,"computed_at":"2026-10-17T05:46:00Z"}},"role":"AI/ML","role_family":"AI/ML","seniority":"senior","employment_type":null,"work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"posting_text","remote_working_hours":null,"hiring_geo_confidence":"inferred","locations":["Amsterdam, Netherlands","Berlin, Germany","London, United Kingdom","Prague, Czech Republic","Munich, Germany","Warsaw, Poland","Madrid, Spain","Belgrade, Serbia","Limassol, Cyprus","Paphos, Cyprus"],"countries":["NL","DE","GB","CZ","PL","ES","RS","CY"],"hiring_countries":["AM","DE","GB","CY","CZ","NL","PL","RS","ES"],"hiring_countries_total":9,"salary":null,"salary_estimate":{"min_usd":29000,"max_usd":76000,"period":"year","method":"global_role_cell_scaled_by_country","sample_n":2102},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Agentic Workflows","optional":false},{"name":"AI Agents","optional":false},{"name":"Fine-tuning","optional":false},{"name":"Machine Learning","optional":false},{"name":"Prompt Engineering","optional":false}],"status":"live","first_seen_at":"2026-08-03T16:43:23Z","employer_posted_date":"2026-08-31","last_verified_at":"2026-10-17T08:46:07Z","board_verified":true,"closed_at":null,"days_open":74,"trust":{"level":"ok","repost_count":0,"flags":[],"days_open":74},"description":"Are you an engineer who loves diving deep into ML models, building standalone CLI tools, and exploring how far AI agents can go in autonomous coding? Do you want to rethink how software is built and use the tools you create every single day?\nAbout JetBrains\nWe create intelligent software development tools for developers and teams. More than 15 million users, over 300,000 companies, and 88 of the Fortune Global Top 100 rely on our products to solve real, complex problems. Our mission is simple: make development teams more productive and AI adoptable at scale.\nWhat you’ll do\nWe 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.\nWe 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.\nYou’ll have end-to-end ownership over these initiatives, taking work from early research to production code while shaping the future of autonomous development.\nDay to day, you will:\nDevelop and ship new features for Junie across CLI and model integrations.\nExperiment with model setups, ensembling, and cost efficiency strategies.\nBuild and test autonomous agent behaviors for long-term project maintenance.\nOwn the full development cycle from initial research to production-ready code.\nUse Junie daily to continuously iterate on its quality and user experience.\nWhat you’ll bring\nComfort taking full ownership of decisions and implementation.\nThe curiosity to challenge assumptions and experiment with new ideas.\nThe ability to learn new concepts quickly and adapt quickly.\nA mindset focused on long-term impact rather than short-term workarounds.\nStrong interest in autonomous AI systems and software engineering tools.\nWhat you’ll need\nA proven track record of developing and shipping machine learning or full-stack software products.\nHands-on experience working with LLMs, prompt engineering, or agentic workflows.\nThe ability to write high-quality production code across the full development lifecycle.\nPractical experience building or fine-tuning ML models.\nWhat success looks like\nIn 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.\nWhy join JetBrains? \nStrong base salary. We offer competitive pay that reflects your skills and experience.\nFlexible work location. Enjoy the freedom to work from home or from the office.\nRemote work. Spend up to 30 days per year working remotely from abroad.\nExtra time off. More days to relax, recharge, and do the things you love.\nMedical insurance allowance. Enjoy peace of mind for you and your family\nLearning and development opportunities. Access to conferences, courses, and language classes.\nRelocation support. We help make your move as smooth and stress-free as possible.\nLanguage classes. Pick up the local language or sharpen your English skills.\nFuel your day. Enjoy a hot meal or receive a lunch allowance on workdays.\nMental health support. To help you feel your best, we provide easy access to professional mental health services.\nSports benefit. Enjoy an on-site gym or sports club stipend.\nInternal events. Join company-wide celebrations and team gatherings.\n*Some benefits may vary depending on location.\nWe are an equal opportunity employer\nWe know great ideas can come from anyone, anywhere. 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