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Director of AI Engineering (GenAI Focus)

London

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

What you'll be doing

You'll be responsible for:

  • Leading GenAI technical strategy and implementation, including:
    • Developing model benchmarking and evaluation frameworks
    • Driving AI tooling development and integration
    • Designing human-in-the-loop systems
    • Establishing dataset collection and curation methodologies
    • Architecting AI infrastructure (model serving, monitoring, scaling)
    • Optimizing performance and defining quality metrics
  • Providing cross-functional leadership:
    • Partnering with medical teams for model safety validation
    • Collaborating with product teams to define model usefulness metrics and user needs
    • Working alongside product peers on solution design and user experience
    • Making technical decisions while aligning with business objectives
    • Building and maintaining relationships with key stakeholders across departments
  • Managing people:
    • Building and developing high-performing engineering teams
    • Coaching and mentoring engineering managers
    • Driving hiring strategies and team growth
    • Fostering an inclusive and collaborative team culture
    • Setting clear goals and development paths for direct reports

Your Experience

Must have:

  • Deep technical expertise in GenAI systems and infrastructure
  • Proven track record of leading engineering teams 
  • Strong cross-functional leadership experience
  • Experience with AI safety and evaluation frameworks
  • Track record of successful product delivery
  • Excellence in stakeholder management
  • Strong technical decision-making abilities

The salary for the role in the UK starts from GBP 160,000 gross + Stock options (Band E, one level below C-level).

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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