Senior AI/ML engineer
Flo Health1 month ago
London, United KingdomSenior
Responsibilities
- Build and ship LLM-powered product features such as AI-generated mobile push notifications, personalized content recommendations, custom user journeys, conversational insights, charts, and widgets.
- Improve perceived and actual AI response latency through streaming, pregeneration, and inference-time tradeoffs while collaborating with Product and Design on user experience.
- Iterate on prompts, calibration, fine-tuned health-domain models, and Judge-as-a-Service tooling to maintain safe, relevant, and high-quality outputs.
- Enable A/B testing for model and prompt changes using evaluation gates to measure impact and support safe releases.
- Create synthetic Q&A data, golden test sets, and evaluation datasets for AI features.
- Contribute to Databricks, AWS, Terraform, and CI/CD infrastructure work as initiatives require.
- Collaborate with Product, Security, Analytics, Medical teams, and technology partners on relevant pre-release capabilities.
Requirements
- 7+ years of software engineering experience with recent hands-on experience building product features backed by LLMs.
- Experience with at least one of prompt engineering, LLM evaluation, fine-tuning, or model serving.
- Strong Python skills and comfort with APIs and SDKs that wrap LLM calls, prompt templates, and structured outputs.
- Demonstrated track record of shipping user-facing features with attention to AI-output latency, tone, and quality.
- Ability to learn infrastructure tools such as Databricks, AWS, Terraform, and GitHub Actions as needed.
- Preferred experience with LLM evaluation frameworks, judges, graders, calibration methodology, fine-tuning techniques, DSPy or similar prompt-optimization frameworks, feature stores, personalization or ranking, healthcare or regulated AI, and data engineering fundamentals including Spark, Delta tables, and Parquet.
Benefits
- Annual salary range of £120,000–£150,000 GBP, with annual reviews and eligibility for Flo’s performance incentive scheme.
- Paid holiday, sick leave, female health leave, and enhanced parental leave and pay.
- Professional growth through mission-driven work and learning support.
- Hybrid work model with three days per week in the office.
- Five-week fully paid sabbatical at the five-year Floversary.
- Flo Premium for friends and family plus health, pension, and wellbeing perks.
Tech Stack
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