500M+ 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
We are looking for a Director of Engineering who is driven by the challenge of scale and the purpose of our platform. You will lead the engineering teams responsible for building innovative, product features that empower women to make informed decisions about their bodies every single day. If you want to use your technical leadership to close the gender health gap and deliver a world-class consumer product that truly matters, this is your opportunity to lead the way.
Your responsibilities
Product Engineering & Delivery
- Define the technical roadmap for our core product areas. You’ll ensure our mobile and backend architecture supports rapid feature iteration and a flawless user experience.
- Champion a culture of product engineering excellence. You’ll set the standards for clean code, smart testing, and building maintainable features.
- Oversee the technical design of complex product features, ensuring seamless integration across our platforms to deliver a highly responsive and intuitive app experience.
- You’ll define what "quality" looks like from the user's perspective, setting the metrics for app performance, smooth transitions, and a crash-free experience.
Strategy & Collaboration
- Work side-by-side with Product leaders to turn big ideas into technical realities. You’ll help figure out the "how" behind the "what."
- You’ll explain technical wins, risks, and trade-offs to non-technical stakeholders in a way that is clear, honest, and compelling.
- You’ll make high-level decisions that balance technical coolness with business needs and budget realities.
People & Culture
- You’ll coach and mentor our Engineering Managers, helping them become the supportive, effective leaders their teams need.
- You’ll drive hiring strategy to attract top-tier talent and help scale our organization.
- Help your team grow by setting clear goals and development paths. You’ll ensure everyone knows how to get to the next level in their career.
Must haves:
- You have a solid background in software architecture, specifically for large-scale, consumer-facing mobile and web applications.
- You have a track record of managing other managers or overseeing multiple product-engineering teams.
- You know how to take a complex product vision, break it down, and get user-facing features across the finish line on time.
- You have experience driving agile delivery and release management, ensuring new features roll out smoothly to millions of users without a hitch.
- You play well with others. You have a knack for negotiating and collaborating deeply with peers in Product, Design, and the C-Suite.
- You have experience building diverse, high-performing teams that succeed.
The salary for the role in the UK starts from GBP 160,000 gross (the final salary depends on the skills and experience of the chosen candidate)
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 equal opportunity employer, and we welcome applicants from all backgrounds, communities and identities. Read our privacy notice for job applicants.
Top Skills
What We Do
Flo is the essential female health partner. We are building a better future for female health by helping women harness the power of their body signals.
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Flo in numbers:
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#1 period tracker in the USA by active audience
#1 most downloaded female health app worldwide
47 million monthly active users
240 million installs
28M women got pregnant while using Flo (the number indicates users who logged pregnancy in app during 2015-2022)
Flo prioritizes safety and keeps a sharp focus on being the most trusted digital source for women's health information.
Flo intensively uses Data Science and AI to deliver the most personalized content and services available.
Flo is currently available in 22 languages on iOS and Android. 55% of users are located in the US and Europe.
We are committed to putting privacy of our users first. Our users trust our technology to keep their sensitive information private and we are responsible for providing a safe and secure platform for them to use. We regularly carry out privacy assessments to monitor risks including data protection impact assessments and third-party risk assessments. In March 2022 Flo completed an external, independent privacy audit which confirmed there are no gaps or weaknesses in our privacy practices.
