{"id":2852877,"url":"https://alion.io/job/q-tech-data-scientist-search-barcelona","title":"Data Scientist – Search | Barcelona","company":{"id":4449260,"name":"Q-tech","domain":"q-techrec.com","url":"https://alion.io/company/q-tech-2","size_band":"5000+","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Teamtailor","truth_index":{"grade":"B","score":75,"open_postings":27,"ghost_share":0,"stale_share":1,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-10-22T06:10:10Z"}},"role":"Data Science","role_family":"Data Science","seniority":null,"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":59000,"max":70000,"currency":"EUR","period":"year","gross":true,"usd_annual":78696},"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"A/B Testing","optional":false},{"name":"Amazon SageMaker","optional":false},{"name":"AWS","optional":false},{"name":"ElasticSearch","optional":false},{"name":"ETL/ELT","optional":false},{"name":"Feast","optional":false},{"name":"Flyte","optional":false},{"name":"Kubeflow","optional":false},{"name":"MLFlow","optional":false},{"name":"NLP","optional":false},{"name":"Pandas","optional":false},{"name":"Python","optional":false},{"name":"Scikit-learn","optional":false},{"name":"SQL","optional":false}],"status":"live","first_seen_at":"2026-03-25T18:13:38Z","employer_posted_date":"2026-03-25","last_verified_at":"2026-10-22T15:39:54Z","board_verified":true,"closed_at":null,"days_open":211,"trust":{"level":"stale","repost_count":0,"flags":["stale"],"days_open":210},"description":"Colaboramos con una scale-up tecnológica con sede en Barcelona, líder en su categoría en el sur de Europa dentro del sector del marketplace C2C. Alrededor de 300 empleados, más de 15 millones de usuarios y millones de interacciones diarias en plataforma. Llevan más de un año en break-even y han sido adquiridos por uno de los grandes grupos tecnológicos a nivel mundial, lo que les está permitiendo escalar el producto y acelerar su expansión por Europa, manteniendo total autonomía de equipo y de producto.\nEl rol\nBuscan un Data Scientist para reforzar el equipo de Search. El objetivo es mejorar el motor de búsqueda y los sistemas de recomendación de la plataforma, con impacto directo en conversión y revenue. Cuando los usuarios no encuentran lo que buscan, se van. Este rol existe para resolver eso.\nEs un rol end-to-end: defines el problema, trabajas los datos, entrenas y despliegas modelos en producción, y haces seguimiento con A/B testing y dashboards. No es un entorno donde los modelos se quedan en staging.\nTrabajarás dentro del equipo de Data Science (7 personas con un Manager), junto a un Senior ya enfocado en Search, y en colaboración estrecha con Product Managers, Engineers y UX Researchers. Una dinámica transversal donde los Data Scientists participan en las decisiones de producto, no solo en las técnicas.\nQué harás\nMejorar el motor de búsqueda: relevancia, ranking y reducción de queries sin resultado\n\nDesarrollar y mantener modelos de recomendación, items similares y personalización\n\nAplicar NLP y LLMs a query understanding y búsqueda semántica\n\nGestionar el ciclo completo: ETL, modelado, entrenamiento, despliegue y monitorización\n\nValidar modelos mediante A/B testing y construir dashboards de seguimiento\n\nExplorar nuevas tecnologías y proponer PoCs con potencial impacto en producto\n\nStack tecnológico\nPython, SQL, Elasticsearch, búsqueda semántica híbrida, AWS (SageMaker), Pandas, Scikit-learn, NLP, embeddings, LLMs, MLFlow/Flyte.\nPerfil\nExperiencia sólida en Search, sistemas de recomendación o ranking en producción\n\nPython fluido y capacidad de escribir código limpio y mantenible, no solo notebooks\n\nSQL avanzado y experiencia trabajando con grandes volúmenes de datos\n\nConocimiento de NLP y LLMs aplicados a búsqueda y personalización\n\nTrack record demostrable de modelos desplegados en producción con impacto real\n\nFormación en un campo cuantitativo (Ingeniería, Matemáticas, Estadística, Física) o experiencia equivalente\n\nSe valora experiencia en entornos e-commerce o marketplace, y familiaridad con herramientas MLOps (MLFlow, Flyte, Kubeflow, Feast).\nCondiciones\nBarcelona, modelo híbrido (mín. 6 días/mes en oficina, el equipo se autoorganiza)\n59.000-70.000€ brutos/año + bonus 5-10% + benefits muy completos (seguro médico, formación, Urban Sports, 26 días de vacaciones, hardware top, entre otros)","description_format":"text","description_chars":2850,"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":"Spanish","level":"Advanced (C1)","optional":false}]},"benefits":[],"hiring_locations":[{"name":"Spain","iso":"ES","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":[],"lifecycle":[{"event":"open","at":"2026-10-19T13:53:04Z"}],"visa":[],"liveness":{"score":2,"band":"cold","label":"Long shot","p_open":1,"p_active":0.064,"p_room":0.28,"age_days":210,"expected_fill_days":19,"reasons":["conf:3","stale_co","velocity","win:tail","crowd:"],"computed_at":"2026-10-22T06:10:10Z"},"pay":{"stated_usd_annual":78696,"is_top_pay":false},"html_url":"https://alion.io/job/q-tech-data-scientist-search-barcelona","json_url":"https://alion.io/job/q-tech-data-scientist-search-barcelona.json","meta":{"generated_at":"2026-10-23T01:31:55Z","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":2514,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-24T00:00:00Z"}},"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":4449260},"rest":"https://alion.io/mcp/rest/get_company?id=4449260"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fq-tech-data-scientist-search-barcelona"},{"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%2Fq-tech-data-scientist-search-barcelona"},{"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%2Fq-tech-data-scientist-search-barcelona"},{"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/q-tech-data-scientist-search-barcelona\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fq-tech-data-scientist-search-barcelona"}]}