{"id":779040,"url":"https://alion.io/job/mercado-libre-software-engineer-sr-fullstack-frontend","title":"Software Engineer Sr Fullstack Frontend","company":{"id":237,"name":"Mercado Libre","domain":"mercadolibre.com","url":"https://alion.io/company/mercado-libre","size_band":"5000+","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Eightfold","truth_index":{"grade":"A","score":88,"open_postings":59,"ghost_share":0,"stale_share":0.492,"repost_share":0,"time_to_fill_p50_days":35,"computed_at":"2026-09-27T05:45:00Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":null,"work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Buenos Aires, Argentina"],"countries":["AR"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":57000,"max_usd":116000,"period":"year","method":"role_seniority_country_cell","sample_n":9},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"CI/CD","optional":false},{"name":"Git","optional":false},{"name":"JavaScript","optional":false},{"name":"Machine Learning","optional":false},{"name":"Node JS","optional":false},{"name":"Python","optional":false},{"name":"React.js","optional":false},{"name":"TypeScript","optional":false}],"status":"live","first_seen_at":"2026-09-03T13:48:01Z","employer_posted_date":"2026-09-11","last_verified_at":"2026-09-28T01:42:29Z","board_verified":true,"closed_at":null,"days_open":24,"trust":{"level":"ok","repost_count":0,"flags":[],"days_open":23},"description":"Como Senior Fullstack Frontend Developer en Mercado Libre, diseñarás y escalarás sistemas innovadores y seguros que resuelven problemas reales y de alto impacto. Trabajarás en un entorno dinámico con tecnología de vanguardia, aplicando buenas prácticas de ingeniería, modelos de IA propios y aprendizaje continuo, con el propósito de democratizar el comercio electrónico y los servicios financieros en América Latina.\nImagináte emprendiendo proyectos desafiantes, dinámicos e innovadores y siendo responsable de:\nDiseñar y desarrollar interfaces web escalables, intuitivas y robustas, con foco en Developer Experience, performance, usabilidad y mantenibilidad.\n\nConstruir soluciones frontend y fullstack que integren GenAI, LLMs, agentes y MCPs, facilitando su adopción mediante experiencias simples, modulares y reutilizables.\n\nDesarrollar soluciones end-to-end integrando APIs, microservicios y componentes backend, trabajando junto a equipos de producto, datos, backend y machine learning.\n\nImpulsar buenas prácticas de ingeniería como componentización, testing automatizado, code review, diseño limpio, documentación y estándares de desarrollo.\n\nInstrumentar métricas de adopción, productividad e impacto, incorporando nuevas tecnologías y tendencias que permitan evolucionar continuamente las soluciones.\n\n¿Qué buscamos en vos?\nTener experiencia sólida en desarrollo frontend con React, TypeScript, JavaScript, HTML y CSS para construir aplicaciones escalables, performantes y mantenibles.\n\nContar con conocimientos de arquitectura frontend, componentización, manejo de estado, testing y buenas prácticas de diseño de interfaces.\n\nPoseer experiencia integrando APIs RESTful, servicios backend y microservicios, junto con conocimientos fullstack en Python, Node.js o tecnologías similares.\n\nManejar prácticas y herramientas de ingeniería como Git, CI/CD, testing unitario, mocking, code review y buenas prácticas de delivery.\n\nDemostrar conocimientos o fuerte interés en GenAI y LLMs, mentalidad de producto, foco en Developer Experience, capacidad de trabajo en equipos interdisciplinarios e inglés técnico.\n\n¿Te animás a dejar huella en la tecnología de América Latina? ¡Postulate y sumate a nuestro propósito!\nModalidad de trabajo híbrida. Site Híbrido: Buenos Aires, Argentina","description_format":"text","description_chars":2284,"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":[],"hiring_excludes":[],"relocation_offered":false,"industries":["Marketplaces","Payment Processing & Gateways","Consumer Loans & Pawnshops"],"lifecycle":[{"event":"open","at":"2026-09-11T23:59:42Z"},{"event":"close","at":"2026-09-13T00:42:40Z"},{"event":"reopen","at":"2026-09-13T12:43:02Z"}],"liveness":{"score":70,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.782,"p_room":0.9,"age_days":23,"expected_fill_days":35,"reasons":["conf:2","velocity","win:mid","comp:brand"],"computed_at":"2026-09-27T05:45:00Z"},"pay":null,"html_url":"https://alion.io/job/mercado-libre-software-engineer-sr-fullstack-frontend","json_url":"https://alion.io/job/mercado-libre-software-engineer-sr-fullstack-frontend.json","meta":{"generated_at":"2026-09-28T04:26:28Z","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":2682,"day_limit":5000,"remaining_today":2318,"minute_limit":60,"resets_at":"2026-09-29T00:00:00Z"}}}