Primer

fullstack developer for payments growth

In short

Senior fullstack developer role at Primer, a fintech building unified infrastructure for global payments, focused on leading frontend architecture for the self-serve onboarding and platform experience (about 80% frontend, 20% Python backend). The role requires proven experience architecting complex frontend applications, mentoring engineers, and setting frontend conventions and quality standards, with some backend willingness but no deep backend expertise required. Fully remote, full-time position.

About
Primer provides unified infrastructure for global payments, giving finance and payments teams visibility and control to reduce complexity, improve performance, and capture more revenue through a single platform.
Responsibilities
•Lead frontend architecture and technical direction for the self-serve onboarding and platform experience, owning how it is built
•Spend roughly 80% of hands-on codebase time on frontend and 20% on backend; this split may shift depending on priorities
•Partner with Design to take the onboarding and platform experience from concept to production, shaping merchants' first steps with Primer
•Mentor engineers joining the team and help raise the bar for their frontend craft
•Set frontend conventions and quality standards, including architecture reviews, code quality, and testing approach
•Contribute to the Python backend when needed to unblock frontend work or deliver features end to end
Requirements
•Proven production experience architecting and building complex frontend applications
•Comfortable being the most senior frontend voice in the room and pushing back on Design or Product when frontend realities require it
•Some backend experience and willingness to work in a Python codebase; deep backend expertise is not required
•Experience mentoring other engineers
Nice to have
•Experience building or integrating payment products
•Experience with growth-, onboarding-, or activation-focused product surfaces
Benefits
•Competitive share options
•Uncapped holiday, with 25 days minimum to be taken
•Access to co-working spaces across major cities
•Workations and a company retreat
•Best equipment for the role
•£500 towards home office setup
•Generous learning budget
•Private Medical Insurance
•Additional perks and benefits depending on location

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