senior ai/ml engineer Work, Jobs in london, eng (with Salaries)

Senior AI/ML engineer
Flo Health —London
- £120,000 - £150,000 a year
- Hybrid work
- Master's degree
- AWS
- APIs
- Annual leave
AI Platform Engineer (EU/UK Based - Remote)
Duvo Inc —London
- £110,000 - £250,000 a year
- Full-time
- Remote
- System design
- APIs
- AI
Senior ML & AI Engineer
Beatport —London
- £80,000 - £88,000 a year
- Full-time
- Remote
- Doctoral degree
- Computer Science
- Master's degree
Quick apply
3d
Tech Lead (EU/UK Based - Remote)
Duvo Inc —London
- £110,000 - £220,000 a year
- Full-time
- Remote
- Management
- System design
- APIs
Senior Staff Generative AI Engineer, Vice President
Citi —London
- Full-time
- Hybrid work
- Management
- Java
- Continuous improvement
Senior AI Engineer
Reward Gateway —London
- £85,000 - £90,000 a year
- Full-time
- Hybrid work
- Master's degree
- SQL
- AWS
Senior Machine Learning Engineer (Chatbot & Generative AI)
Sky —London
- Full-time
- Hybrid work
- AWS
- Machine learning
- Agile
Senior Software Engineer – AI
Durlston Partners —London
- £150,000 - £200,000 a year
- Python
Senior AI/ML Engineer
Limbic —London
- Full-time
- Hybrid work
- Azure
- Doctoral degree
- Engineering
11d
Senior Dev Ops Engineer
MI6 - Secret Intelligence Service —London
- £63,823 a year
- Part-time
- Azure
- DevOps
- AWS
- Annual leave
Deployment Strategist
Normal Computing Corporation —London
- £200,000 - £270,000 a year
- Full-time
- Hybrid work
- Project management
- Product management
- AI
Site Reliability Engineer (EU/UK Based - Remote)
Duvo Inc —London
- £110,000 - £250,000 a year
- Full-time
- Remote
- System design
- APIs
- AI
AI Engineer, Senior Associate
Partners Capital —London
- Azure
- Computer Science
- Master's degree
- Life insurance
Applied AI Solution Engineer - Kearney Activate
Kearney —London
- Full-time
- Azure
- Master's degree
- SQL
Senior Research Engineer
Decagon —London
- £200,000 - £300,000 a year
- Full-time
- AI
- Python
- Life insurance
Senior AI Engineer
Xelix —London
- £80,000 - £90,000 a year
- Full-time
- Hybrid work
- System design
- Master's degree
- Machine learning
- Employee discount
Quick apply
9d
Senior Principal AI Engineer
Synapri —London
- £90,000 - £120,000 a year
- Hybrid work
- Azure
- AWS
- AI
Senior AI Engineer
Bluefish AI —London
- Remote
- Master's degree
- Analysis skills
- Machine learning
Senior Applied AI Engineer
Lawhive —London
- £90,000 - £140,000 a year
- Full-time
- Hybrid work
- Master's degree
- AWS
- APIs
- Annual leave
Senior ML Engineer
Boehringer Ingelheim Ltd. —London
- Full-time
- Hybrid work
- Doctoral degree
- Computer Science
- Machine learning

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Senior AI/ML engineer

Flo Health -
London

Apply Now

Job details

£120,000 - £150,000 a year

Benefits

Annual leave
Company pension
Sabbatical

Qualifications

Law
Kubernetes
Spark
Master's degree
AWS
Terraform
SDKs
Unity
GitHub
APIs
S3
AI
Python

Full job description

500M+ downloads. 80M+ 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 7M 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 a Senior Software Engineer with deep expertise in AI/ML infrastructure to join our AI Platform team and help build the GenAI platform that powers every AI feature at Flo.

You will bridge core infrastructure, data engineering, and LLM development to deliver production-grade medical safety judges, fine-tuning pipelines, evaluation frameworks, and real-time personalisation. The team operates 60+ LLM-based evaluation judges, develops proprietary fine-tuned health models, and maintains active partnerships with Databricks, Google, OpenAI, Anthropic, and AWS.

What you’ll do

LLM Judge Ecosystem: build and scale Judge-as-a-Service, prompt registries, calibration pipelines, and evaluation orchestration using MLflow 3.x
Fine-Tuning and Serving: develop LoRA/SFT/preference optimisation pipelines for health-domain models (Llama, Gemma, MedGemma) and manage model serving at scale on Databricks
Data and Evaluation Pipelines: build synthetic Q&A generation, golden test sets, reward function engineering, and Delta table schemas in Unity Catalog for reliable, reproducible evaluation data
Infrastructure: maintain Terraform-managed AWS infrastructure (EKS, S3, IAM), Databricks AI Gateway, and CI/CD pipelines (GitHub Actions) with evaluation gates and progressive rollout
Cross-Functional Impact: collaborate with Product, Security, Analytics, and Medical teams, develop internal SDKs and APIs consumed by 5+ teams, and engage directly with technology partners on pre-release capabilities

Experience and skills

Must have:

Engineering maturity: 7+ years of software engineering, 4+ years focused on ML/AI platforms
LLM experience: recent hands-on work with at least one of: fine-tuning, prompt engineering, LLM evaluation, or model serving
Technical stack: strong Python across production services and data pipelines, data engineering fundamentals (Spark, Delta tables, Parquet)
Platform and infrastructure: Databricks (MLflow, Unity Catalog, Model Serving), AWS (EKS/Kubernetes, IAM), Terraform, GitHub Actions
Cross-domain flexibility: comfort working across ML, data engineering, and infrastructure. You don’t need to be expert in all three, but you contribute wherever the team needs it

Nice to have:

LLM evaluation frameworks (judges, graders, calibration methodology) or fine-tuning techniques (LoRA, RLHF/DPO, model distillation)
ML data engineering: synthetic data generation, evaluation dataset design, annotation pipelines
Healthcare, regulated industry, or safety-critical AI systems experience
Prompt optimisation frameworks (DSPy or similar), feature stores (Tecton)

#LI-KP1 #LI-Hybrid

Annual Salary Range (ranges may vary based on skills and experience)

£120,000 - £150,000 GBP

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
In-person collaboration and work in a hybrid model, with 3 days per week spent in the office
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.

Apply Now

Refine Your Search

senior ai/ml engineer jobs in london, eng

Senior AI/ML engineer

AI Platform Engineer (EU/UK Based - Remote)

Senior ML & AI Engineer

Tech Lead (EU/UK Based - Remote)

Senior Staff Generative AI Engineer, Vice President

Senior AI Engineer

Senior Machine Learning Engineer (Chatbot & Generative AI)

Senior Software Engineer – AI

Senior AI/ML Engineer

Senior Dev Ops Engineer

Deployment Strategist

Site Reliability Engineer (EU/UK Based - Remote)

AI Engineer, Senior Associate

Applied AI Solution Engineer - Kearney Activate

Senior Research Engineer

Senior AI Engineer

Senior Principal AI Engineer

Senior AI Engineer

Senior Applied AI Engineer

Senior ML Engineer

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