Flo Health - Principal Infrastructure Engineer
Requirements
• Experience: Many years in infrastructure, platform, SRE or DevOps roles running high-traffic, distributed systems in production. You have operated at Principal or Staff scope, setting direction across teams as well as delivering. • Kubernetes depth: You have run Kubernetes in production for real workloads, ideally EKS. You can explain what happens between kubectl apply and a pod serving traffic, and you have debugged it when it didn't. • Kubernetes depth: • Data infrastructure awareness: You understand how PostgreSQL, DynamoDB and Kafka behave under load and when they fail: connection limits, replication lag, hot partitions, consumer lag, retention. You don't need to have been a DBA, but you know what good looks like and when to ask for help. • Data infrastructure awareness: • AWS and infrastructure as code: Strong AWS knowledge and fluent Terraform. Coding experience in Go or Python is a plus. • AWS and infrastructure as code: • Communication: A doc-first habit, and the ability to bring distributed product teams with you. • Communication: • AI first: you will have seen the impact AI automation is having on development teams and the software delivery lifecycle, and have strong ideas on how infrastructure should support it. • Hardening infrastructure for high-compliance or security-sensitive environments (HIPAA, SOC 2, PCI). • Running managed data services in AWS (RDS, Aurora, MSK, DynamoDB) at scale, including migrations and major version upgrades. • Scaling consumer platforms with millions of concurrent users. • Certifications such as AWS Certified Solutions Architect Professional, CKA or CKS.
Responsibilities
• Principal Infrastructure Engineer • More than 80 million women open Flo every month to understand their bodies and their health. Every one of those sessions runs on infrastructure we build, and the data behind it is as personal as data gets. Keeping that fast and private at this scale is the job. • Velocity runs the platform that every Flo engineer builds on: Kubernetes on AWS, the data stores behind our services, and the golden paths that let product teams ship without needing to be infrastructure experts. We treat our internal developers as our customers. You will: • Own the foundations: Design and run the Kubernetes and data infrastructure behind 80 million monthly active users, and make it boring in the best sense. • Own the foundations: • Turn expertise into self-service: Take what you know about running clusters and databases well, and build it into the defaults so product teams get it for free. • Turn expertise into self-service: • Kubernetes at scale: Architect and evolve our EKS estate: cluster lifecycle and upgrades, networking, autoscaling, workload isolation, and the Helm and Terraform that deploy onto it. • Kubernetes at scale: • Data infrastructure: Shape how our services use PostgreSQL, DynamoDB and Kafka. Set the patterns for provisioning, access, backup, failover and capacity, so teams aren't solving these problems one service at a time. • Data infrastructure: • Golden paths: Build self-service tooling and Terraform modules that give product teams autonomy without sacrificing stability or security. • Golden paths: • Reliability: Lead resilience work, including business continuity planning, disaster recovery testing and a sustainable on-call rotation. • Reliability: • Observability: Make sure metrics, logs and traces tell us something is wrong before our users do. • Observability:
Benefits
• High impact: Flo is used by 1 in 4 women aged 18–44 in the US, and has raised $200M to build what comes next. • High impact: • Autonomy: We hire experts and trust them to deliver. • Autonomy: • Modern stack at scale: EKS, Terraform, Kafka, PostgreSQL, DynamoDB and Sentry, serving more than 80 million people a month. • Modern stack at scale: • Annual Salary Range (ranges may vary based on skills and experience) • £130,000—£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 • 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
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