Senior CI / Build Systems Engineer

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 mentoring engineers or leading cross-te