Senior Software Engineer, Fullstack (App Experience)

Remote US · 5+ years experience · Remote · Posted Oct 9, 2026

At a glance

Affirm is seeking a Senior Software Engineer, Fullstack (App Experience) to work on the Marketplace and App Experience domain, driving user journeys across mobile and web frontend surfaces.
This role involves leading front-end facing cross-team projects, collaborating closely with mobile and web technologies, and partnering with product experience teams.

Break down larger projects into individual tasks with the support of your team’s tech lead and manager, deliver them in multiple phases, and collaborate with others to ensure timely delivery.
Support peers and stakeholders in the product development lifecycle by collaborating with product management, design & analytics through ideation, articulating technical constraints, and partnering on decisions considering risks and trade-offs.
Support operations and availability of your team’s artifacts by creating and monitoring metrics, escalating when needed, and supporting 'keep the lights on' & on-call efforts.
Contribute to a sense of community on your team by engaging in growth and development activities such as participating in the interview process.

You have a total of 1.5+ years of experience as a software engineer.
You have experience shipping web apps using declarative UI frameworks like React or Vue.
You have experience shipping mobile apps using native or cross-platform languages like React Native.
You have experience designing, developing and launching APIs at scale using languages like Kotlin or Python.
You have mastered taking a simple problem or business scenario into a solution that interacts with multiple software components, and executing on it by writing clear, easily understood, well tested and extensible code.
You are comfortable navigating a large code base, debugging others' code, and providing feedback to other engineers through code reviews.
Your experience demonstrates that you take ownership of your growth, proactively seeking feedback from your team, your manager, and your stakeholders.
You have strong verbal and written communication skills that support effective collaboration with our global engineering team.
This position requires either equivalent practical experience or a Bachelor’s degree in a related field.

100% subsidized medical coverage, dental, and vision for employees and their dependents
Monthly stipends for health, wellness, and tech spending
Flexible time off and generous holiday calendars
Employee stock purchase plan (ESPP)