
At Flo, our purpose is to build a better future for female health. We are the world’s leading period and ovulation tracker, empowering over 420 million women globally to take control of their health. With 75 million monthly active users, including 25% of US women, Flo has become a trusted partner in women's health. As the first European femtech unicorn, following a $230M Series C in July 2024, we're proud to lead the way in innovation and investment in women's health. With over 120+ medical experts, Flo is committed to supporting women at every stage of their health journey, from menstruation to conception, pregnancy, and menopause. We provide curated cycle and ovulation tracking, tailored health insights, daily bite-sized visual content, and a private community for users to share their questions and concerns. Flo addresses critical challenges in women’s health by: *Expanding access: Through partnerships like UNFPA, Flo provides free Premium access to up to 1 billion women in 66 countries, with 17 million subscriptions donated, helping bridge healthcare disparities. *Improving health literacy: By delivering accurate, accessible information and daily insights, Flo empowers millions to better understand their health and make informed decisions. *Advancing women's health research: Collaborating with leading institutions, Flo contributes to evidence-based women’s health research. In a world where women's health data is increasingly vulnerable, Flo is dedicated to providing a safe and secure platform. Recognized for its commitment to privacy, Flo's Anonymous Mode feature was named one of TIME's Best Inventions of 2023 and a finalist for Fast Company's 2023 World Changing Ideas Awards. Anonymous Mode allows users to access Flo's health features without associating personal information with their health data, setting a new industry standard for reproductive health data privacy.

At Flo, our purpose is to build a better future for female health. We are the world’s leading period and ovulation tracker, empowering over 420 million women globally to take control of their health. With 75 million monthly active users, including 25% of US women, Flo has become a trusted partner in women's health. As the first European femtech unicorn, following a $230M Series C in July 2024, we're proud to lead the way in innovation and investment in women's health. With over 120+ medical experts, Flo is committed to supporting women at every stage of their health journey, from menstruation to conception, pregnancy, and menopause. We provide curated cycle and ovulation tracking, tailored health insights, daily bite-sized visual content, and a private community for users to share their questions and concerns. Flo addresses critical challenges in women’s health by: *Expanding access: Through partnerships like UNFPA, Flo provides free Premium access to up to 1 billion women in 66 countries, with 17 million subscriptions donated, helping bridge healthcare disparities. *Improving health literacy: By delivering accurate, accessible information and daily insights, Flo empowers millions to better understand their health and make informed decisions. *Advancing women's health research: Collaborating with leading institutions, Flo contributes to evidence-based women’s health research. In a world where women's health data is increasingly vulnerable, Flo is dedicated to providing a safe and secure platform. Recognized for its commitment to privacy, Flo's Anonymous Mode feature was named one of TIME's Best Inventions of 2023 and a finalist for Fast Company's 2023 World Changing Ideas Awards. Anonymous Mode allows users to access Flo's health features without associating personal information with their health data, setting a new industry standard for reproductive health data privacy.
Sector: Femtech / Women's health app
Founded: 2015
Scale: ~70 million monthly active users (company-reported range 2024–2025)
Unicorn status: Valued > $1B after Series C in July 2024
Notable investor: General Atlantic (Series C, >$200M)
ISO 27001 and ISO 27701 certifications
| Company |
|---|
Female reproductive and menstrual health; personalized health insights and lifecycle care.
2015
IT Services and IT Consulting
> $200,000,000
Minority investment that valued the company above $1 billion post-money.
$50,000,000
“General Atlantic led a >$200M Series C in 2024, providing growth-stage investor support and resulting in a >$1B valuation.”
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 We are looking for an AI/ML Platform Engineer to join the AI Platform team. This team builds and maintains Flo's shared platform for artificial intelligence, enabling every product team to use AI safely, efficiently, and at scale. If you're passionate about cutting-edge generative AI technologies and driven by building robust ML infrastructure that delivers value to millions of users, we would love to hear from you!
In this role, you will work at the intersection of machine learning engineering and MLOps, owning both the development and operationalization of AI/ML systems. Your responsibilities will span from fine-tuning and optimising large language models to building and maintaining the infrastructure that enables rapid experimentation and reliable deployment at scale. You will work with state-of-the-art technologies including LLMs, model evaluation frameworks, and modern ML infrastructure to build solutions that are medically safe and work at scale.
The AI Platform team acts as the central enabler of machine learning and AI initiatives across the organisation. Its mission is to reduce operational overhead and maximise ROI from ML use cases. The team builds and maintains critical infrastructure including LLM evaluation frameworks (AI Judges), model deployment pipelines, fine-tuning infrastructure, user profiles store, experiment tracking systems, and monitoring frameworks. By working closely with domain teams, the AI Platform team delivers scalable, high-quality solutions that accelerate time-to-market while ensuring compliance and maintaining the highest standards of performance.
What You'll Be Doing
Must have:
Nice to have:
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.