{"id":1231727,"url":"https://alion.io/job/sonarsource-ai-researcher-post-training-2","title":"AI Researcher - Post-Training","company":{"id":4925,"name":"SonarSource","domain":"sonarsource.com","url":"https://alion.io/company/sonar","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Lever","truth_index":{"grade":"A","score":90,"open_postings":104,"ghost_share":0,"stale_share":0.192,"repost_share":0,"time_to_fill_p50_days":66,"computed_at":"2026-10-03T05:45:00Z"}},"role":"AI/ML","role_family":"AI/ML","seniority":"middle","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Geneva, Switzerland"],"countries":["CH"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":91000,"max_usd":260000,"period":"year","method":"global_role_cell_scaled_by_country","sample_n":585},"experience_years_min":4,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"AI Agents","optional":false},{"name":"C#","optional":false},{"name":"C++","optional":false},{"name":"Java","optional":false},{"name":"LLM","optional":false},{"name":"Machine Learning","optional":false},{"name":"Post-training","optional":false},{"name":"Python","optional":false},{"name":"Rust","optional":false},{"name":"SonarQube","optional":false},{"name":"Fine-tuning","optional":true},{"name":"GRPO","optional":true},{"name":"PEFT","optional":true},{"name":"PPO","optional":true},{"name":"SFT","optional":true},{"name":"Synthetic Data","optional":true},{"name":"Transformers","optional":true}],"status":"live","first_seen_at":"2026-08-05T16:22:28Z","employer_posted_date":"2026-08-05","last_verified_at":"2026-10-04T01:35:22Z","board_verified":true,"closed_at":null,"days_open":59,"trust":{"level":"ok","repost_count":0,"flags":[],"days_open":58},"description":"Position description\nAt Sonar, we are seeking an ambitious senior researcher to join our cross-disciplinary team, innovating and developing the next generation of solutions to build enterprise-grade coding agents and models. You will harness Sonar’s deep experience in static analysis, and combine it with your experience and leading techniques in large language model post-training. If you are interested in being hands-on with state-of-the-art research, building practical solutions that deliver high-impact for customers, and working within a team of innovative researchers and engineers, this role is for you.\nWhat you will do\nOutcome Driven Development: Work in a team developing and implementing advanced products that enable customers to post-train models to power their agentic coding practices. These agents need to generate high-quality code that meets their enterprise standards and software development best practices.\n\nTranslate Prototypes to Products: Collaborate closely with researchers, research engineers, MLOps and engineers within the team to design hypotheses and experiments, iterate proofs-of-concept quickly and develop successful prototypes into cutting-edge products.\n\nSubject Matter Expert: You will contribute and discuss ideas within our cross-disciplinary team, driving towards the next generation of coding model post-training for enterprises.\n\nSpearhead Research & Innovation: Stay up-to-date with the latest LLM and agentic developments; you are driven by learning and teaching others. You will need to explain complex technical details and concepts to both technical and non-technical audiences.\n\nExperience and qualifications\nThe ideal candidate will have:\nAn advanced academic background (Master’s or PhD) in Computer Science, Machine Learning, or a related quantitative field.\n\n4+ years industry experience in machine learning, with a solid understanding of modern software engineering practices and tools.\n\nFluency with Python including core ML frameworks, experience with Rust or any of SonarQube’s flagship languages (C#, C++, JS/TS, Java) is a plus.\n\nExpertise in post-training of large language models, including:\n\nPolicy optimization algorithms (e.g. GRPO, PPO)\n\nVerifier-based RL frameworks (RLVR)\n\nSupervised fine-tuning (SFT)\n\nData-centric AI methods, including synthetic data and curation\n\nParameter-efficient fine-tuning (PEFT)\n\nPreference and Safety Alignment\n\nExperience of driving research projects, delivering valuable findings and prototypes, and then converting them into products.\n\nExcellent communication skills in English and a talent for explaining complex scientific topics clearly and concisely.","description_format":"text","description_chars":2655,"description_truncated":false,"requirements":{"experience_years_min":4,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"master","optional":false},"security_clearance":false,"languages":[{"language":"English","level":"All levels","optional":true}]},"benefits":[],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":["Application Security","Software Testing & QA","Developer Tools"],"lifecycle":[{"event":"open","at":"2026-09-25T15:07:37Z"}],"visa":[],"liveness":{"score":42,"band":"fade","label":"Fading","p_open":1,"p_active":0.702,"p_room":0.6,"age_days":58,"expected_fill_days":66,"reasons":["conf:12","velocity","win:late","crowd:brand"],"computed_at":"2026-10-03T05:45:00Z"},"pay":null,"html_url":"https://alion.io/job/sonarsource-ai-researcher-post-training-2","json_url":"https://alion.io/job/sonarsource-ai-researcher-post-training-2.json","meta":{"generated_at":"2026-10-04T01:43:28Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","usage":{"tier":"crawler","counted_by":"address","units_charged":1,"used_today":2278,"day_limit":5000,"remaining_today":2722,"minute_limit":60,"resets_at":"2026-10-05T00:00:00Z"}}}