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  2. Flo

Data Science Lead

Posted on July 26, 2025 (7 days ago)

Job Description

Flo is the world’s #1 health app on a mission to build a better future for female health. With over 400M downloads, 75M+ monthly users, and 6M paid subscribers, Flo has established trust and a leading position in the health app market.
Flo seeks a Data Science Lead in London to build and lead the Predictive Growth Optimization team. This team focuses on ML models that power user acquisition strategy, predict lifetime value, and optimize over $25M annual marketing spend across channels.

Responsibilities

  • Lead and develop a team of 4+ ML and Backend engineers including hiring, mentoring, and setting technical direction.
  • Own the predictive lifetime value (pLTV) strategy, evolving the core models that guide millions in user acquisition decisions.
  • Build production machine learning systems ranging from marketing mix modeling algorithms to real-time forecasting models with millions of predictions per day.
  • Drive cross-functional impacts by partnering with Growth, Product, and Finance teams translating business problems into ML solutions.
  • Shape technical architecture for MLOps infrastructure, monitoring and rapid iteration cycles.
  • Stay hands-on in modeling, architecture decisions, and technical problem-solving as needed.

Qualifications

  • 7+ years of applied machine learning experience building and deploying models in production.
  • 4+ years managing technical teams like ML engineers and data scientists.
  • Expert knowledge of ML fundamentals including supervised/unsupervised learning, time series, causal inference.
  • Experience with modern ML frameworks such as PyTorch, TensorFlow, scikit-learn, CatBoost.
  • Experience with growth analytics, attribution modeling, and marketing effectiveness.
  • Understanding of user acquisition funnels and retention optimization.
  • Ability to translate business requirements into technical roadmaps and strong communication skills to explain complex models to executives.
  • Experience deploying ML models at scale (millions+ predictions per day).
  • Knowledge of MLOps practices including model versioning, monitoring, and automated retraining.
  • Understanding of data engineering fundamentals and cloud platforms.
  • Nice to have: experience with marketing mix modeling, attribution, ad tech, consumer tech, mobile or health tech, privacy-preserving ML techniques, and A/B testing methodology.

Work Culture and Benefits

Flo is a mission-led, product-driven team that moves fast with focus and ownership. They value craftsmanship, purposeful shipping, and raising the bar. The team cares about health outcomes and supports resilience and commitment.
Benefits include competitive salary with annual reviews, performance incentive scheme, paid holiday and leaves including female health leave, enhanced parental leave and pay, accelerated professional growth, flexible office and remote working options, 5-week paid sabbatical at 5-year tenure, Flo Premium for friends and family, and other health, pension, and wellbeing perks.
Flo is an equal opportunity employer committed to diversity, equity, and inclusion, hiring based on merit and skill without discrimination.

How to Apply

Please visit the job posting page on the Flo Health Greenhouse site at https://job-boards.greenhouse.io/flohealth/jobs/6327429003?gh_jid=6327429003 and apply directly through their application form.