Senior iOS Build & Test Infrastructure Engineer

Ōura • Hybrid - Helsinki, Uusimaa • 3w ago

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 Build & Test Infrastructure Engineer to own and evolve the iOS build and test foundations used by all iOS engineers at Oura. This role plays a critical part in improving 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).
Git 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.