{"id":790621,"url":"https://alion.io/job/zefir-software-engineer","title":"Software Engineer","company":{"id":688165,"name":"Zefir","domain":"zefir.fr","url":"https://alion.io/company/zefir-3","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":{"grade":"B","score":70,"open_postings":10,"ghost_share":0.5,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-10-31T05:58:55Z"}},"role":"Backend","role_family":"Backend","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":["Paris, France"],"countries":["FR"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":59000,"max_usd":105000,"period":"year","method":"role_country_seniority_unknown","sample_n":508},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":true,"technologies":[{"name":"Agentic Workflows","optional":false},{"name":"AI Agents","optional":false},{"name":"GraphQL","optional":false},{"name":"LangChain","optional":false},{"name":"LLM","optional":false},{"name":"Nest.JS","optional":false},{"name":"Next.js","optional":false},{"name":"Node JS","optional":false},{"name":"Pinecone","optional":false},{"name":"RAG","optional":false},{"name":"React.js","optional":false},{"name":"TypeScript","optional":false},{"name":"JavaScript","optional":true}],"status":"live","first_seen_at":"2026-04-13T13:10:22Z","employer_posted_date":"2026-04-13","last_verified_at":"2026-10-31T19:15:51Z","board_verified":true,"closed_at":null,"days_open":201,"trust":{"level":"ghost","repost_count":0,"flags":["stale","company_stale"],"days_open":200},"description":"Who We Are\nZefir is building an AI autopilot for home sales in Europe, starting in France: an AI agent runs the entire sale and purchase journey end-to-end, orchestrating local brokers, portals, buyers, and documents.\nBacked by €60 million from top-tier investors Sequoia Capital and Kima Ventures, we're committed to accelerating life changes for millions of current and future European homeowners.\nA note on timing\nThis role is part of our hiring plan, and we will start hiring for it again from mid-November 2026. We are keeping this page open so that we can meet great engineers before then.\nIf you apply now, we will reply within two weeks. If your profile is a strong match, we will set up a first conversation before November. Otherwise, we will get back to you when hiring restarts.\nWith your application, your profile joins our talent pool for up to 2 years. You can ask us to delete it at any time by writing to .\nEngineering Team\nAt Zefir, our Engineering Team is the driving force behind our mission to accelerate life changes. Growing rapidly from 9 to 30+ engineers, we don’t just write code-we solve meaningful problems for our customers.\nFrom ideation to launch and beyond, engineers at Zefir take full ownership of their work, ensuring that every feature delivers the expected impact. We leverage LLM-based development workflows and shared best practices to automate repetitive tasks, allowing us to keep our codebase lean, scalable, and built for speed.\nResponsibilities/Mission\nDevelop and deploy robust, high-performance APIs using Node.js (TypeScript), Nest.js, and GraphQL.\n\nBuild intuitive frontend applications with React.js and Next.js, delivering outstanding user experiences.\n\nCollaborate closely with Product Managers and cross-functional teams (Operations, Growth, Brand) to prioritize features and deliver key objectives.\n\nOwn the full lifecycle of features from ideation and design through implementation, deployment, and performance monitoring.\n\nWrite clean, maintainable, thoroughly-tested code to ensure fast deployments and continuous improvement.\n\nImplement comprehensive end-to-end (E2E) tests to ensure reliability and reduce code review cycles.\n\nProactively contribute to strategic decisions about the future direction of our web applications and infrastructure.\n\nLeverage LLM-based libraries and implement key AI-driven functionalities (RAG, memory, agentic workflows) using stacks like Pinecone and Langchain.\n\nQualification\nEntrepreneurial mindset with a demonstrated ability to turn ambitious ideas into practical solutions.\n\nExcellent problem-solving skills, with the ability to quickly evaluate and recommend effective technological solutions.\n\nHighly collaborative, open-minded, and comfortable working closely with diverse teams.\n\nAmbitious, performance-oriented, and maintains a positive attitude.\n\nFluent in both English and French (required), written and spoken.\n\nBenefits\nThe following is for permanent employees only. For other contracts (interns, apprentices, fixed-term..), please, check with your recruiter. \nCompetitive salary: You can run your own simulation with our salary calculator.\n\nBSPCE (Stock Options): Available for everyone, with monthly vesting after year one, over a 4-year period.\n\nHealthcare plan: Full coverage with Alan for team members, their partners, and children.\n\nOffice in Le Peletier, Paris (9th arrondissement): With flexible remote work options.\n\nSwile meal card: €11 per worked day.\n\nSwile mobility card: €45/month to support sustainable transportation (metro, carpooling, biking…).\n\nTeam events: Monthly Mixers to connect and share good times, and quarterly All Hands to celebrate wins across the company.\n\nOur Operating Principles\nSteep Mountains Are Steep: Setting ambitious goals and working hard to achieve them.\nRide Reality: Actively seeking challenges and thriving by adapting flexibly to changes.\nPlay for the Front of the Jersey: Prioritizing team success over individual recognition.\nApplication & Process\nWe welcome applications from anyone, regardless of background, gender, sexual orientation, religion, age, or experience. Our team values authenticity and diverse perspectives.\nFor all roles, our interview process emphasizes hands-on exercises, case studies, or discussions about specific examples of your previous work. 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