{"id":142061,"url":"https://alion.io/job/flo-health-senior-backend-engineer","title":"Senior Backend Engineer","company":{"id":51646,"name":"Flo Health","domain":"flo.health","url":"https://alion.io/company/flo-health","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":{"grade":"A","score":88,"open_postings":14,"ghost_share":0,"stale_share":0.5,"repost_share":0,"time_to_fill_p50_days":40,"computed_at":"2026-10-24T06:02:35Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":null,"work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Vilnius, Lithuania"],"countries":["LT"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":6500,"max":10000,"currency":"EUR","period":"month","gross":null,"usd_annual":134772},"salary_estimate":null,"experience_years_min":7,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Java","optional":false},{"name":"Python","optional":false},{"name":"Scala","optional":false},{"name":"SQL","optional":false},{"name":"AWS","optional":true},{"name":"GCP","optional":true}],"status":"live","first_seen_at":"2025-10-01T09:22:24Z","employer_posted_date":"2026-10-15","last_verified_at":"2026-10-24T15:32:41Z","board_verified":true,"closed_at":null,"days_open":388,"trust":{"level":"stale","repost_count":0,"flags":["stale"],"days_open":387},"description":"500M+ downloads. 80M+ monthly users. A decade of building - and we’re still accelerating.\nFlo is the world’s #1 health & fitness app worldwide on a mission to build a better future for female health. Backed by a $200M investment led by General Atlantic, we became the first product of our kind to reach a $1B valuation in 2024 - and we’re not slowing down.\nWith 7M paid subscribers and the highest-rated experience in the App Store’s health category, we’ve spent 10 years earning trust at scale. Now, we’re building the next generation of digital health - AI-powered, privacy-first, clinically backed - to help our users know their body better.\nThe job\nBuild systems that power the #1 Health App for Women\nWe’re not a startup guessing what might work anymore, we’re operating at serious scale. Flo is used by 1 in 4 women aged 18-44 in the US. And we just hit our biggest month ever with 8.6M installs and a 2.8M MAU jump. The engineering behind that? Complex, distributed, secure and yours to help shape.\nAt Flo, backend engineering is core product work.\nWe build:\nData-driven health insights that genuinely change lives\nDistributed systems that stay fast, available and scalable under massive real-time demand\nPrivacy-first features like Anonymous Mode - recognised in TIME’s Best Inventions\nTooling and platforms that help Flo’s teams move faster, with fewer bottlenecks\nWe’re tech-agnostic when hiring for backend. If you’ve built and run distributed systems and want to work in Scala (or already do), great. We’ll support your ramp-up. What matters most: you can solve problems, own outcomes, and keep learning.\nYour Experience\nYou’ll thrive here if you:\nHave 7+ years’ experience building distributed backend systems\nKnow what it takes to make systems fast, reliable and secure and when to prioritise each\nAre fluent in Java, Scala, Python or similar (and curious enough to learn Scala with us)\nGet DevOps, databases (SQL and NoSQL) and love designing APIs that just work\nHave a strong handle on writing clean, documented, version-controlled code\nTake ownership, show initiative and don’t wait to be told\nAre product-minded and always thinking about the end-user impact\nBonus if you’ve worked with:\nStream processing\nPublic cloud infrastructure (AWS, GCP etc.)\nWhat’s in it for you?\nYou’ll join a senior engineering team that moves fast, thinks big and builds tech used by millions daily. You’ll work on meaningful problems with real impact - in health, privacy and scale. This isn’t just code for the sake of code. This is building the future of personalised health.\n#LI-Hybrid #LI-LM12\nSalary Range - gross per month (ranges may vary based on skills and experience)\n€6.500—€10.000 EUR\nHow we work\nWe’re a mission-led, product-driven team. We move fast, stay focused and take ownership - from brief to build to impact. Debate is encouraged. Decisions are shared. We care about craft, ship with purpose, and always raise the bar.\nYou’ll be working with people who take their work seriously, not themselves. It takes commitment, resilience, and the drive to keep going when things get tough. Because better health outcomes are worth it. \nWhat you'll get\nWe support impact with meaningful reward. Here’s what that looks like:\nCompetitive salary and annual reviews\nOpportunity to participate in Flo’s performance incentive scheme\nPaid holiday, sick leave, and female health leave\nEnhanced parental leave and pay for maternity, paternity, same-sex and adoptive parents\nAccelerated professional growth through world-changing work and learning support\nIn-person collaboration and work in a hybrid model, with 3 days per week spent in the office\n5-week fully paid sabbatical at 5-year Floversary\nFlo Premium for friends & family, plus more health, pension and wellbeing perks\nDiversity, equity and inclusion\nOur strength is in our differences. At Flo, hiring is based on merit, skill and what you bring to the role - nothing else. We’re proud to be an equal opportunity employer, and we welcome applicants from all backgrounds, communities and identities. Read our privacy notice for job applicants.","description_format":"text","description_chars":4098,"description_truncated":false,"requirements":{"experience_years_min":7,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Equity","Parental leave"],"hiring_locations":[{"name":"Lithuania","iso":"LT","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Women’s Health & Maternity","Consumer Health Apps"],"lifecycle":[{"event":"open","at":"2025-10-01T09:22:24Z"},{"event":"open","at":"2026-09-25T19:22:27Z"}],"visa":[],"liveness":{"score":6,"band":"cold","label":"Long shot","p_open":1,"p_active":0.202,"p_room":0.28,"age_days":387,"expected_fill_days":40,"reasons":["conf:3","stale_co","velocity","win:tail","crowd:"],"computed_at":"2026-10-24T06:02:35Z"},"pay":{"stated_usd_annual":134772,"is_top_pay":false},"html_url":"https://alion.io/job/flo-health-senior-backend-engineer","json_url":"https://alion.io/job/flo-health-senior-backend-engineer.json","meta":{"generated_at":"2026-10-24T17:42:32Z","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":25777,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-25T00:00:00Z"}},"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":51646},"rest":"https://alion.io/mcp/rest/get_company?id=51646"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fflo-health-senior-backend-engineer"},{"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%2Fflo-health-senior-backend-engineer"},{"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%2Fflo-health-senior-backend-engineer"},{"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/flo-health-senior-backend-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fflo-health-senior-backend-engineer"}]}