Job Description

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.

Requirements

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

Nice to have

Stream processing
Public cloud infrastructure (AWS, GCP etc.)

Company offers

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