Backend Engineer - AI platform
Flo
- London, England, United Kingdom
- London, England, United Kingdom
À propos
Backend Engineer
to own the User Profile service—a high-scale system (20k RPS,
User Profile 2.0 , bridging the gap between raw user data and advanced ML feature stores. You will operate in a hybrid model: building core capabilities for AI/ML data representations while governing an inner-source ecosystem that allows other teams to contribute safely. If you are passionate about high-concurrency systems and enabling AI at scale, we want to hear from you!
What you'll be doing:
Develop new features for the User Profile service – the central platform that powers personalization, experimentation, and AI features including Flo Conversational AI
Build User Profile 2.0 capabilities including historical data arrays, AI-ready attribute representations, and integration with ML feature stores
Design and implement data pipelines that deliver user attributes to AI/ML systems for personalized content generation and predictive models
Enable inner-source contributions: establish contribution guidelines, quality gates, and architectural standards for product teams
Review and approve pull requests from contributing teams, providing mentorship and ensuring code quality
Maintain architectural oversight of core components while enabling safe, autonomous contributions from product teams
Build and maintain attribute governance frameworks, cataloguing systems, and documentation standards
Ensure compliance with healthcare regulations (HIPAA, SOC 2, GDPR) and implement privacy-first design patterns
Participate in on-call rotation and drive incident response for this critical platform service
Work in a cross-functional setup alongside other engineering teams (Backend, ML, QA), product, and analytics teams
Your Experience Must have:
7+ years of professional experience building distributed backend systems at scale
Fluency in Scala, Java, or Python – with willingness to work primarily in Scala (we'll support your ramp-up if needed)
Deep experience with AWS services, particularly DynamoDB, EKS, and serverless architectures
Strong understanding of observability – logging, metrics, tracing, and alerting – and how to use it to drive operational excellence
Experience building high-throughput, low-latency APIs serving millions of users
Solid understanding of databases (SQL and NoSQL) and experience designing APIs that prioritise reliability and performance
Experience with code review, mentorship, and establishing engineering standards across teams
Track record of writing clean, documented, version-controlled code
Ownership mentality – you take initiative, don't wait to be told, and see problems through to resolution
Strong communication skills – you can collaborate effectively with multiple teams and explain technical decisions clearly
Nice to have:
Experience with ML infrastructure, feature stores, or data platforms that serve AI/ML workloads
Familiarity with data pipelines and integration patterns for machine learning systems
Experience with inner-source or open-source contribution models and governance
Experience with platform/infrastructure teams supporting multiple product teams
Healthcare compliance framework experience (HIPAA, SOC 2, GDPR)
Experience in the MedTech or HealthTech domain
Experience at a Tier-1 product company or related experience working within a product organisation
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.
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Compétences linguistiques
- English
Avis aux utilisateurs
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