{"id":3093534,"url":"https://alion.io/job/lexroom-senior-ai-engineer","title":"Senior AI Engineer","company":{"id":678416,"name":"Lexroom","domain":"lexroom.ai","url":"https://alion.io/company/lexroom-2","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":{"grade":"B","score":83,"open_postings":13,"ghost_share":0,"stale_share":0.692,"repost_share":0,"time_to_fill_p50_days":27,"computed_at":"2026-10-25T05:49:26Z"}},"role":"AI/ML","role_family":"AI/ML","seniority":"senior","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Barcelona, Spain"],"countries":["ES"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":70000,"max":100000,"currency":"EUR","period":"year","gross":null,"usd_annual":112251},"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":true,"technologies":[{"name":"LLM","optional":false},{"name":"NLP","optional":false},{"name":"Pre-training","optional":false},{"name":"Python","optional":false},{"name":"RAG","optional":false},{"name":"Reinforcement Learning","optional":false}],"status":"live","first_seen_at":"2026-10-22T13:08:02Z","employer_posted_date":"2026-10-22","last_verified_at":"2026-10-25T09:20:59Z","board_verified":true,"closed_at":null,"days_open":2,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":2},"description":"Lexroom is building the AI platform where legal work gets done. In just over two years, we've grown from zero to €25M ARR, and today more than 20,000 legal professionals across Italy, Spain, Germany, France, and Bulgaria rely on Lexroom.\nWe're backed by $73M from Left Lane Capital, Base10 Partners, and Eurazeo, and we're a team of around 300 builders who move fast, say things straight, and own each outcome.\nOur next goal? Become Europe's most-used legal product.\nWhyLexroom?\nShape the Standard: Be part of the team setting the benchmark for legal AI in Europe.\n\nWork with the Best: Collaborate with exceptional colleagues in a culture that values competence, curiosity, and ambition.\n\nDeliver Meaningful Results: Your contribution will directly influence how legal professionals work-faster, clearer, and more efficiently.\n\nAt Lexroom, we leave buzzwords behind. Here, you’ll build something that lasts: a trusted platform, a strong reputation, a new standard for the legal world.\nWhat You'll Do\nDesign and build agent-driven and RAG-based AI systems to solve complex legal tasks with precision and efficiency.\n\nFine-tune and post-train LLMs using cutting-edge supervised and reinforcement learning techniques to raise response quality.\n\nDevelop and optimize large-scale search pipelines for LLM-powered agents.\n\nImplement and refine NLP algorithms to extract, structure, and validate information from legal documents.\n\nRun end-to-end evaluations to pinpoint bottlenecks, measure performance, and guide continuous improvements.\n\nWork closely with legal experts to design evaluation protocols and build reliable, domain-specific datasets that strengthen every layer of the stack.\n\nMaintain technical excellence by following established best practices, coding standards, and rigorous code-review processes.\n\nWhat You’ll Bring\nProven expertise in building and managing robust ML pipelines.\n\nStrong Python skills with hands-on experience in LLM research and deep learning systems.\n\nKnowledge of search technologies such as full-text search, vector databases, or other large-scale retrieval systems.\n\nCollaborative mindset and readiness to work with legal experts, researchers, and engineers to keep improving the product.\n\nFamiliarity with MLOps and integrating ML models into production backends (a strong plus).\n\nUp-to-date with LLM innovation, ideally with experience in pre-training or deploying large-scale models in real-world scenarios.\n\nFluency in English, both written and spoken, knowledge of Italian is a plus.\n\nWhat Sets Us Apart\nAn Exceptional Team.\nAt Lexroom.ai, you’ll work alongside top talent in tech and legal AI.\nOur focused teams operate with purpose and autonomy, so every contribution delivers visible results.\nYou’ll collaborate with people who pair innovation with rigor, curiosity with discipline, ambition with depth.\nGrowth that Matters.\nWe hire exceptional people to make a difference-and we give them space to lead.\nAs we scale, your work will shape the future of legal technology and set new standards for the field.\nImpact is defined by vision and execution, not by age or title. If you’re ready to take responsibility, you’ll find real opportunities to grow and lead high-stakes projects.\nRewarding Your Contribution.\nWe value excellence and share success:\nAnnual Salary Range: €70,000 - €100,000\n\nEquity Package: Align your growth with the company’s long-term success.\n\nBenefits That Matter\nHybrid Work: Flexibility to balance remote work with in-person collaboration at our Barcelona office.\n\nHealth Coverage: Comprehensive insurance to keep you secure and focused.\n\nMeal Vouchers: Daily support for your lunch breaks.\n\nPerformance Bonuses: Rewards directly tied to measurable results.\n\nTeam Retreats & Off-sites: Dedicated time to connect, collaborate, and spark bold ideas.\n\n**At Lexroom.ai, ambition meets discipline and purpose.\nWe’re not just building a product-we’re setting a new standard for the legal world. If you’re ready to contribute to something lasting and meaningful, we’d love to hear from you.**","description_format":"text","description_chars":4048,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[{"language":"Italian","level":"All levels","optional":true},{"language":"English","level":"Advanced (C1)","optional":false}]},"benefits":["Equity","Hybrid work"],"hiring_locations":[{"name":"Spain","iso":"ES","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Legal AI"],"lifecycle":[{"event":"open","at":"2026-10-22T15:35:06Z"}],"visa":[],"liveness":{"score":63,"band":"ok","label":"Likely open","p_open":1,"p_active":0.632,"p_room":1,"age_days":2,"expected_fill_days":27,"reasons":["conf:0","stale_co","velocity","win:early"],"computed_at":"2026-10-25T05:49:26Z"},"pay":{"stated_usd_annual":112251,"is_top_pay":false},"html_url":"https://alion.io/job/lexroom-senior-ai-engineer","json_url":"https://alion.io/job/lexroom-senior-ai-engineer.json","meta":{"generated_at":"2026-10-25T12:55:08Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":18242,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-26T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":678416},"rest":"https://alion.io/mcp/rest/get_company?id=678416"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Flexroom-senior-ai-engineer"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Flexroom-senior-ai-engineer"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Flexroom-senior-ai-engineer"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/lexroom-senior-ai-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Flexroom-senior-ai-engineer"}]}