Sr Mobile Infrastructure Engineer II

Tandem Diabetes Care

8d•$165,000 - $185,000•Remote

About The Position

The Mobile Infrastructure team at Tandem Diabetes Care exists to keep our mobile engineering teams moving fast and shipping with confidence. We own the CI/CD systems, build automation, macOS runner fleet, and shared tooling that iOS and Android engineers rely on every day to build life-critical medical device software. We are looking for a Senior Mobile Infrastructure Engineer II to help own our macOS and Linux runner infrastructure and mobile pipelines. This role is central to how we scale CI capacity, maintain runner health, and ship reliable builds for our iOS and Android applications. Working across provisioning automation, cloud-hosted VM platforms, GitHub Actions workflow design, and the Apple toolchain, this role partners closely with mobile engineers to reduce friction throughout the development lifecycle. The CI systems this role owns directly support the reliability, quality, and delivery of FDA-regulated medical device software used daily by people with diabetes.

Requirements

8+ years of experience in software engineering, CI/CD, or build/release engineering with meaningful ownership of production systems.
Bachelor’s degree in engineering or computer sciences or related field or equivalent combination of education and applicable job experience.
Proficiency in Python, shell scripting, YAML, and Git.
Production experience with GitHub Actions, including reusable workflows, matrix strategies, concurrency controls, and composite actions.
Strong iOS CI expertise including deep familiarity with Xcode build configuration, Apple code signing (certificates, provisioning profiles, entitlements), simulator management, and automated TestFlight or App Store delivery.
Experience with cloud-hosted or local macOS VM platforms such as Orka/MacStadium, Tart, or equivalent.
Experience with Apple Developer account management including certificates, provisioning profiles, and App Store Connect API.

Nice To Haves

Experience with Firebase App Distribution for internal mobile build delivery.
Experience with Android build systems and signing pipelines.
Experience integrating mobile testing frameworks — unit, instrumented, snapshot, contract, and end-to-end — into CI pipelines.
Background in iOS or Android mobile development.
Experience in a regulated industry such as medical devices with traceability and compliance requirements.
Experience running multi-flavor/multi-variant Android builds with regional distribution targets.

Responsibilities

Manages and evolves the cloud-hosted macOS VM fleet, including provisioning automation, capacity planning, health monitoring, and recovery; ensures runners are reliable, up-to-date, and consistently configured across environments.
Designs, maintains, and improves build, test, signing, and release workflows for iOS and Android applications; drives improvements in build time, queue time, and flake rates through systematic measurement and iteration.
Builds reusable workflows, composite actions, and shared tooling consumed across iOS, Android, and infrastructure repositories; establishes consistent, maintainable patterns for CI authoring in GitHub Actions.
Writes reliable, well-tested Python and shell scripts for build orchestration, runner management, artifact handling, and secret lifecycle management.
Instruments runner health, build durations, and failure patterns; owns alerting for outages and degraded pipeline states.
Maintains toolchain version consistency across developer machines and CI environments; documents systems and authors runbooks.
Maintains distribution certificates, provisioning profiles, and export configurations for Apple code signing; automates expiry monitoring and rotation across all build variants and environments.
Contributes to Android build and signing workflows, including multi-flavor, multi-variant build pipelines and Firebase App Distribution delivery.