Senior Backend Engineer

500M+ downloads. 80M+ monthly users. A decade of building – and we’re still accelerating.

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.

Build systems that power the #1 Health App for Women

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 writing clean, documented, version-controlled code
Take ownership, show initiative and don’t wait to be told
Are product-minded and always thinking about the end-user impact
Stream processing
Public cloud infrastructure (AWS, GCP etc.)

You’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.
#LI-Hybrid #LI-LM12
Salary Range - gross per month (ranges may vary based on skills and experience)
€6.500—€10.000 EUR
How we work
We’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.
You’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. 
What you'll get
We support impact with meaningful reward. Here’s what that looks like:
Competitive salary and annual reviews
Opportunity to participate in Flo’s performance incentive scheme
Paid holiday, sick leave, and female health leave
Enhanced parental leave and pay for maternity, paternity, same-sex and adoptive parents
Accelerated professional growth through world-changing work and learning support
In-person collaboration and work in a hybrid model, with 3 days per week spent in the office
5-week fully paid sabbatical at 5-year Floversary
Flo Premium for friends & family, plus more health, pension and wellbeing perks
Diversity, equity and inclusion
Our 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