Senior iOS Platform Engineer - Oura

The App DevX team exists to improve the day-to-day effectiveness of mobile engineers at Oura by providing fast, stable, and observable CI/CD systems, robust build and test infrastructure, and strong developer-facing tooling. We focus on systemic improvements that scale across teams and measurably improve developer productivity.

We are looking for a Senior iOS Platform Engineer to own and evolve the iOS platform, build and test foundations used by all iOS engineers at Oura. This role plays a critical part in improving application observability, build performance, test stability, and CI reliability while reducing operational risk. 

What you will do

Own iOS build system performance and reliability

• Act as a deep technical owner of the iOS build system, including Xcode configuration, build internals, and performance characteristics.
• Diagnose and resolve build-time bottlenecks, non-determinism, and performance regressions in both local and CI environments.
• Improve build debuggability and predictability for day-to-day iOS development.

Own iOS test architecture and stability

• Define and evolve test architecture for iOS unit, integration, and UI tests, with a strong focus on determinism and signal quality.
• Lead the design and adoption of integration testing frameworks and patterns suitable for iOS at scale.
• Set clear standards and policies for flaky tests, including detection, quarantine, remediation, and enforcement.
• Partner with Testing and Release teams to shift meaningful iOS test signals earlier into CI and local workflows.
  
  

Own iOS CI execution models

• Design and maintain iOS CI execution models, including simulator usage, sharding strategies, and test parallelization.
• Improve CI runtime, queue time, and failure rates for iOS pipelines through systematic measurement and iteration.
• Partner closely with CI and infrastructure engineers to ensure iOS workloads are efficiently supported by the CI fleet.
  
  

Own Tuist project generation and tooling

• Own and evolve Tuist-based project generation, structure, and tooling.
• Improve developer workflows around project generation, caching, and incremental builds.
• Define best practices and guardrails to keep the iOS project structure scalable over time.
  
  

Improve developer feedback loops

• Ensure iOS build and test results are clear, actionable, and surfaced early.
• Reduce “works on my machine” issues by improving local–CI parity.
• Use metrics and data to guide prioritization and prevent regressions.
  
  

We would love to have you on our team if you have

• Strong experience as an iOS engineer with a focus on build systems, test infrastructure, or developer tooling.
• Deep understanding of Xcode builds, dependency graphs, and build performance optimization.
• Experience designing or evolving iOS test architectures, including integration or UI testing at scale.
• Experience operating and improving iOS build and test systems in CI environments.
• Proven ability to improve local developer build and test loops for iOS engineers.
• Comfort using CI metrics, logs, and failure patterns to guide debugging and prioritization.
• Strong root-cause analysis skills and the ability to debug complex, non-deterministic failures.
• Clear communication skills and the ability to work effectively with iOS engineers, platform teams, and partners.

Technical expertise in (not all required)

• Xcode build internals, build settings, and performance optimization.
• iOS test frameworks and integration testing approaches.
• CI execution models for iOS (simulators, parallelization, sharding).
• Tuist project generation and related tooling.
• macOS environments and iOS toolchains.
• Scripting and automation (Bash, Swift, Python).
• Github workflows and CI-based development.
  
  

Nice to have

• Familiarity with developer-facing observability or instrumentation in pre-release environments.
• Experience contributing to or shaping CI standards beyond a single platform.
• Interest in mentoring other iOS engineers in build and test best practices.
• Exposure to cross-platform mobile build or test systems.

Current iOS environment (for context)

Today, our iOS build and test infrastructure includes:

• Xcode projects generated via Tuist
• fastlane for build, test, and release-related automation
• Swift and XCTest-based unit, integration, and UI test suites
• CI execution primarily using simulator-based test sharding
• GitHub Actions for CI orchestration, running on macOS-based runners

Benefits:

• Competitive Salary
• Lunch benefit
• Wellness benefit
• Flexible working hours + work-life balance
• Collaborative, smart teammates
• An Oura ring of your own
• Easy-to-reach offices in Oulu Teknologiakylä and in Helsinki city center
• Latest equipment of choice