500M+ downloads. 77M+ 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 6M 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:
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:
Bonus if you’ve worked with:
What’s in it for you?
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
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:
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 equal opportunity employer, and we welcome applicants from all backgrounds, communities and identities. Read our privacy notice for job applicants.
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Flo is the fastest-growing AI-powered women's health platform that encompasses accurate cycle predictions, personalized daily health insights and a closed secure community of experts and peers. Flo meets the needs of women of all ages and goals, - from periods to menopause, from pregnant women to young moms, - and is truly a one-stop health solution for women during an entire reproductive cycle. Flo prioritizes safety, and keeps sharp focus on being the only platform to which women can entrust their most intimate health-related concerns. Flo is the first to use artificial intelligence (AI) for the most accurate cycle predictions - by 54.2% more accurate compared to traditional statistical models. This gives women with irregular periods a chance to get reliable predictions. With Flo, women around the globe can track and predict menstrual cycles;- increase the chance of conception with expected conception and fertile days;- and get support and reminders of pregnancy from the community;- and improve their health status by using a variety of apps, tips, and other health information;- and symptoms;-
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