Senior/Lead Backend Engineer at flohealthflohealth · Vilnius

Workplace: Hybrid

Posted: 2026-11-10

Skills: Python, Java, SQL, AWS500M+ downloads. 80M+ monthly users. A decade of building – and we’re still accelerating. Flo 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. With 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. The job Build systems that power the 1 Health App for Women We’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. At Flo, backend engineering is core product work. We build: Data-driven health insights that genuinely change lives Distributed systems that stay fast, available and scalable under massive real-time demand Privacy-first features like Anonymous Mode - recognised in TIME’s Best Inventions Tooling and platforms that help Flo’s teams move faster, with fewer bottlenecks We’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. Your Experience You’ll thrive here if you: Have 7+ years’ experience building distributed backend systems Know what it takes to make systems fast, reliable and secure and when to prioritise each Are fluent in Java, Scala, Python or similar (and curious enough to learn Scala with us) Get DevOps, databases (SQL and NoSQL) and love designing APIs that just work Have a strong handle on…Sign in to see the original postingBrowse more developer jobs on RoleBurst