Staff Software Engineer, Mobile (App Infrastructure)

About the Role

App Infrastructure is the team behind Affirm's shared mobile app infrastructure — the platform every other mobile feature team builds on. We own the app’s shared components: design system, networking, observability, experimentation, CI/CD, app releases, developer tooling, availability/stability, and more.

We care about ownership: shipping tools and runbooks other teams actually adopt, writing specs before building, and being the go-to experts for the mobile tech stack. We're small, technical, and highly collaborative.

What You'll Do

• Set technical strategy for your team on a year-long time scale, connecting it to critical, business-impacting projects.
• Collaborate across teams in the product development lifecycle with product management, design, and analytics to ensure technical sustainability, risks, and trade-offs are well understood and managed.
• Act as a force-multiplier for your team through your definition and advocacy of technical solutions and operational processes.
• Take ownership of your team’s operations and availability by ensuring the right monitoring, triage rotations, playbooks, policies, testing, and alerting are in place to support “keep the lights on” and on-call efforts.
• Foster a culture of quality and ownership by setting code review and design standards, advocating for them through writing and tech talks.
• Help develop talent on your team by providing feedback, guidance, and leading by example.

What We Look For

• 7+ years of experience developing and architecting mobile applications; 4+ using React Native.
• Proficient in working with JavaScript/TypeScript.
• Hands-on experience with React Native and Expo, including authoring or migrating native modules and components.
• Experience with complex state management in a React app (proficiency with Redux Toolkit is a bonus).
• Experience performing React Native SDK major updates and debugging across the JS↔native boundary under the New Architecture.
• Up-to-date knowledge on native OS releases and how they land in a React Native app.
• Experience with mobile testing and observability tooling (E2E frameworks like Maestro/Appium, crash reporting like Sentry/Crashlytics, and experimentation/feature-flagging platforms like Statsig/LaunchDarkly).
• Proficient and up to date on AI-assisted development (Claude Code or comparable agentic tooling) with sound judgment on guardrails and quality.
• Proven track record of driving a team to execute large projects.
• Experience delivering major features, system components, or deprecating existing functionality with technical execution plans and high-quality code.
• Ability to thrive in ambiguity, moving from low-level language idioms to large system architectures.
• Strong verbal and written communication skills supporting collaboration across a global engineering team.
• Either equivalent practical experience or a Bachelor’s degree in a related field.