Senior Software Engineer, Fullstack (App Experience)

Remote · Remote US · USD 153,000-213,000 / year · 5+ years experience · Remote · Posted Oct 9, 2026

At a glance

The Senior Software Engineer, Fullstack (App Experience) works within the Marketplace and App Experience domain at the forefront of front-end facing cross-team projects. This role drives the user journey across mobile and web frontend surfaces by collaborating closely with product management, design, analytics, and other engineering 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 team artifacts by creating and monitoring metrics, escalating when needed, and supporting keep the lights on and on-call efforts.
Contribute to a sense of community on the 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.

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

Remote-first with flexibility built in
Open only to candidates residing in Alberta, British Columbia, Manitoba, New Brunswick, Newfoundland and Labrador, Nova Scotia, Ontario, Prince Edward Island, or Saskatchewan for Remote Canada
Some positions may occasionally require in-person work at an Affirm office