Senior/ Lead Android 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.

As an Android Engineer at Flo, you'll help shape the mobile experience for millions of people, and do genuinely meaningful work in women's health. Our app is trusted by 1 in 4 women aged 18–44 in the US and used across 100+ countries, with machine learning and AI powering accurate cycle predictions and personalised,...

Developing features using modern frameworks, libraries and in-house components - contributing to a shared codebase built to last
Delivering polished, intuitive user experiences that meet a high bar for design and usability
Maintaining and improving a continuous delivery pipeline, ensuring fast, reliable and safe releases to production

#LI-Hybrid #LI-AJ1
Annual Salary Range (ranges may vary based on skills and experience)
£95,000—£120,000 GBP
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.

Knowledge of Kotlin programming language, Clean Architecture and reactive programming
An eye for UX and interaction design - you care about how things feel, not just how they work
Hands-on experience with mobile CI/CD tooling, including build, test and release automation
Experience integrating with analytics and BI systems, including A/B testing frameworks
Experience with alternative Android markets
Experience optimising data usage over mobile networks and building offline-first applications