400M+ downloads. 75M+ monthly users. A decade of building – and we’re still accelerating.
Flo is the world’s #1 health app 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
As an Android Engineer at Flo, you’ll help shape the mobile experience for millions. Our app is used by 1 in 4 women aged 18–44 in the US and trusted by users across 100+ countries.
We build large-scale mobile application with rich, intuitive interfaces – optimised for speed, accessibility and privacy. You’ll be part of a cross-functional team working across the full mobile lifecycle, from feature ideation to release and iteration.
We’re not a feature factory. We own the product, the quality and the outcomes. Our engineers are problem-solvers and collaborators who thrive in fast-moving environments and ship with purpose. Read more about our mobile tech stack
Your Experience
Must have:
- Expert-level knowledge of Android with 7+ years of experience developing, shipping, and maintaining mobile applications
- Experience developing large mobile applications with rich UI, preferably for global consumer markets
- Proficient in Java with strong object-oriented design skills
- Strong knowledge of different versions of Android, Android UI design principles, patterns, best practices, dealing with different screen sizes and aspect ratios
- Experience with Google technologies, development guidelines, Google Play processes for app submission and maintenance
- Good understanding of a mobile product life cycle; acquaintance with Agile methodologies
- Agile mindset, ambitious, motivated and a good team player
Nice to have:
- Knowledge of Kotlin programming language, Clean Architecture and reactive programming
- Knowledge of UX and Interaction design
- Experienced with mobile continuous delivery tooling (build, test and release automation)
- Integration with BI and analytical systems. A/B testing
- Experience with alternative Android markets
- Optimizing data usage over mobile networks and experience with offline-first apps
What you'll be doing
You'll be responsible for:
- Modern frameworks and libraries along with in-house components
- Spicy user experience and attractive design
- Continuous Delivery
#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:
- 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
- Flexible office + home working, up to 2 months a year working abroad
- 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.
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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.
