Senior CI / Build Systems Engineer

Our mission at Oura is to empower every person to own their inner potential. Our award-winning products help our global community gain a deeper knowledge of their readiness, activity, and sleep quality by using their Oura Ring and its connected app. We've helped millions of people understand and improve their health by providing daily insights and practical steps to inspire healthy lifestyles. Empowering the world starts with living our values and empowering our team. As a quickly growing company focused on helping people live healthier and happier lives, we ensure that our team members have what they need to do their best work — both in and out of the office. The App DevX team exists to improve the day-to-day effectiveness of mobile engineers at Oura by making CI/CD fast, stable, and observable, and by providing robust build and test infrastructure for iOS and Android. We are looking for a Senior CI & Build Systems Engineer to own and evolve our mobile CI, build, test, and developer-facing observability systems end-to-end. This role sits at the intersection of mobile build systems, CI infrastructure, and shared cloud-based execution environments - directly unblocking progress across testing, observability, and quality gating while establishing App DevX as a trusted platform team. What you will do: Own and evolve mobile CI systems at scale - design, maintain, and improve PR, merge, and release pipelines for iOS and Android; drive improvements in CI runtime, queue time, and merge failure rates through systematic measurement and iteration Build and operate CI infrastructure - manage CI runner fleets including capacity planning and reliability; implement caching, sharding, and parallelization strategies; partner with infrastructure teams on capacity and performance expectations Own mobile build system expertise - serve as technical owner for Gradle (Android) and Xcode / Tuist (iOS); improve build performance, determinism, and local–CI parity to reduce "works on my machine" failures Own test architecture and stability - define and evolve test architecture for unit, integration, and UI tests; set standards for flaky test detection, quarantine, and remediation; partner with Testing and Release teams to shift meaningful signals earlier into CI Own developer-facing observability - own logging, metrics, and tracing practices for pre-release workflows; ensure CI environments surface actionable signals about app behavior, performance, and regressions Set technical direction and long-term strategy for mobile CI, build systems, and observability; mentor other engineers; act as a technical partner to infrastructure and backend teams Requirements We would love to have you on our team if you have: 8+ years in software engineering, CI/CD, or build systems with meaningful ownership of production systems Experience operating CI, build, or test systems across multiple teams or a large codebase A systems-first mindset with a track record of improving reliability, performance, and developer productivity at scale Experience supporting high-velocity mobile development teams Comfort reasoning about distributed systems, shared infrastructure, and capacity-related failure modes Strong root-cause analysis skills and comfort debugging complex, non-deterministic failures Excellent communication skills and ability to work effectively across teams and org boundaries Technical expertise in (not all required): Mobile CI systems at scale: runner fleets, caching, sharding, and parallel execution Mobile build systems: Gradle (Android) and/or Xcode / Tuist (iOS) Test stability tooling and diagnosing flaky or non-deterministic failures CI observability: metrics, dashboards, and alerting Scripting and automation (e.g. Bash, Python), Linux and macOS environments, Git workflows Familiarity with cloud-based execution environments (e.g. AWS) Nice to haves: Mobile development background (iOS, Android, or both) Deeper hands-on AWS experience beyond CI execution Experience