{"id":2022854,"url":"https://alion.io/job/our-clients-ab-lead-full-stack-developer","title":"Lead Full Stack Developer","company":{"id":2367615,"name":"Thermosphr","domain":"thermosphr.com","url":"https://alion.io/company/thermosphr","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Welcome to the Jungle","truth_index":null},"role":"Backend","role_family":"Backend","seniority":"lead","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":58000,"max_usd":100000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":60},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"AWS","optional":false},{"name":"Azure","optional":false},{"name":"Claude Code","optional":false},{"name":"GCP","optional":false},{"name":"JavaScript","optional":false},{"name":"Python","optional":false},{"name":"TypeScript","optional":false},{"name":"MQTT","optional":true},{"name":"Terraform","optional":true}],"status":"live","first_seen_at":"2026-09-23T15:53:42Z","employer_posted_date":"2026-10-07","last_verified_at":"2026-10-11T01:59:48Z","board_verified":true,"closed_at":null,"days_open":17,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":17},"description":"Join our team as a Lead Full Stack Developer, where you'll have the opportunity to lead and set direction while staying hands-on with coding. You'll be responsible for building and maintaining a robust backend and cloud infrastructure, as well as translating commercial and product priorities into technical work. This hybrid position is based in Central Paris, with 1-2 days per week on-site.\nMissions\nImplement, maintain, and continuously improve a robust, scalable, high-performance backend and cloud infrastructure.\nTranslate commercial and product priorities from the leadership team and internal stakeholders into technical work, and give an honest read on cost, risk, and sequencing before anything is committed.\nDefine what the team needs, run technical interviews, make the call on candidates, and own whether people ramp up well.\nProfil recherché\n**The position****You report to the CTO** (Aaron) and work alongside **two senior software engineers** (Sylvain and Tim). **You are the technical authority on the platform** and the day-to-day lead for the team.\n**We have no dedicated ops team (yet)**, so running your own services in production is part of the job. There is no on-call rotation.\nThis is a **hybrid position based in Central Paris, 1-2 days per week on site**. The alignment part of this role works better in person, and the people you will be translating for are here.\n**What you bring**\n* **Professional fluency in English (C1/C2)**.\n* **Advanced programming skills in Python 3.12+, and JavaScript (or TypeScript)**.\n* **Product judgment**. You can tell the difference between a request and a requirement, and you have opinions about what should be built that you are willing to defend and to drop.\n* **Senior-level experience building and operating back-end systems in critical production environments**, including a period as tech lead, lead developer, or the de facto technical owner of a small team.\n* **Working front-end experience**. You do not need to be a front-end specialist, but you need to be able **to ship a feature end-to-end without waiting for someone else**, and to review front-end work credibly.\n* Ability **to explain and trivialize technical subjects** clearly to non-technical audiences\n* **Real experience with GCP or an equivalent (AWS, Azure)**, or a clear willingness to get there fast.\n* **Analytical and critical thinking**, the ability to take responsibility for quality from prototype to production, and **the ability to say no**.\n* **Fluency with AI-assisted coding tools (Claude Code and similar)**, including the ability to **critically evaluate AI-generated code** and continuously improve internal procedures.\n* **Comfort with a die and retry philosophy**: **fail fast** in development, rigor in production.\n* **A genuine interest in producing battle-tested**, **production-grade code** within a distributed environment, and in staying current on software engineering and security.\n* **Entrepreneurial mindset**: you find solutions, take initiative, and accept that at our size responsibilities do not come in neat boxes.\n**Bonus points**\n* **High bonus: familiarity with IoT, MQTT, or building automation (HVAC)**.\n* **High bonus: networking knowledge**: routers, VLANs. You will be asked to handle those.\n* **Ability to challenge existing architectures**, including ones that have worked for years.\n* **True fullstack experience** (from prototype to production, any framework, any language) and the ability to maintain a production fleet.\n* **Infrastructure as code with Terraform**.\nYou are curious and willing to learn. So are we. Even if you do not tick every box, we encourage you to apply.","description_format":"text","description_chars":3657,"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":"English","level":"Advanced (C1)","optional":false}]},"benefits":[],"hiring_locations":[{"name":"France","iso":"FR","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Real Estate","Property Development","Urban Planning"],"lifecycle":[{"event":"open","at":"2026-10-07T13:23:40Z"}],"visa":[],"liveness":{"score":58,"band":"ok","label":"Likely open","p_open":1,"p_active":0.777,"p_room":0.75,"age_days":16,"expected_fill_days":23,"reasons":["conf:0","velocity","win:late"],"computed_at":"2026-10-10T05:45:15Z"},"pay":null,"html_url":"https://alion.io/job/our-clients-ab-lead-full-stack-developer","json_url":"https://alion.io/job/our-clients-ab-lead-full-stack-developer.json","meta":{"generated_at":"2026-10-11T03:56:37Z","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","counted_by":"address","units_charged":1,"used_today":2114,"day_limit":5000,"remaining_today":2886,"minute_limit":60,"resets_at":"2026-10-12T00:00:00Z"}},"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":2367615},"rest":"https://alion.io/mcp/rest/get_company?id=2367615"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Four-clients-ab-lead-full-stack-developer"},{"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%2Four-clients-ab-lead-full-stack-developer"},{"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%2Four-clients-ab-lead-full-stack-developer"},{"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/our-clients-ab-lead-full-stack-developer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Four-clients-ab-lead-full-stack-developer"}]}