Location
London

Hours
Full Time

Salary
Negotiable

About the Role
Flo Health is the world’s #1 health & fitness app worldwide, with over 500 million downloads and 80 million monthly users. Backed by a $200M investment and achieving a $1B valuation in 2024, Flo is on a mission to build a better future for female health. With 7 million paid subscribers and the highest-rated experience in the App Store’s health category, we are now building the next generation of digital health—AI-powered, privacy-first, and clinically backed—to help users understand their bodies better.

The Velocity team exists to eliminate friction by treating internal developers as customers. As Principal DevEx Engineer, you will abstract complexity by building intuitive tooling that enables self-service, allowing developers to focus on product logic. You will standardize excellence by baking best practices, security, observability, and scalability into the core stack so they are not afterthoughts.

You will build self-service tools that empower product teams with autonomy without sacrificing system stability, architect and evolve our core stack (AWS, EKS, Terraform), lead reliability initiatives including business continuity planning and sustainable on-call rotations, support infrastructure for industry-leading privacy features such as our TIME-recognized "Anonymous Mode," and implement best-in-class monitoring (metrics, logs, tracing) to proactively identify and mitigate issues before they impact users.

Experience
15+ years in AWS Infrastructure, Developer Experience, Site Reliability Engineering, or DevOps roles supporting high-traffic, distributed environments.

About you
Deep expertise in AWS and Kubernetes (K8s) is essential.
Proficient in Infrastructure as Code (Terraform) with a coding background; experience with Python, Scala, or Go is beneficial.
Comfortable working across all levels of the stack, from front-end development using React to engineering Terraform modules for infrastructure abstractions.
Strong communication skills with a "doc-first" mentality and ability to collaborate across distributed product teams.
Experience with AI automation’s impact on development teams and software delivery lifecycle, with strong ideas on how to support them.

Qualifications
Bonus points for background in hardening infrastructure for high-compliance or security-sensitive environments.
Experience scaling consumer tech platforms with millions of concurrent users.
Professional accreditations such as AWS Professional Architect, CKAD, or KCSA are advantageous.