Senior Engineer, Fullstack - Growth

An Introduction to Primer

Primer is the unified infrastructure for global payments. We give finance and payments teams the visibility and control to reduce complexity, improve performance, and capture more revenue — all from a single platform.

Backed by Sofina, Peak XV Partners, ICONIQ, Tencent, Accel, and Balderton, we're building the payments layer the world's best companies rely on.

Which team will you be joining?

You'll be joining the Growth team, which owns merchant onboarding and activation: everything between a new account and a first live payment. It's a newly formed team taking on a new product area for Primer, so there's a lot of scope to shape both what we build and how. Primer is remote-first and globally distributed.

What will you be doing?

• Lead frontend architecture and technical direction for the self-serve onboarding and platform experience, with real ownership over how it's built, not just what gets shipped.
• Spend roughly 80% of your hands-on codebase time on frontend and 20% on backend (split is a guide, not a rule).
• Partner closely with Design to take onboarding and platform experience from concept to production.
• Mentor and raise the bar for the engineers who join the team.
• Set frontend conventions and quality standards for a team that's still being built — architecture reviews, code quality, and testing approach.
• Contribute to the Python backend where it's needed to unblock frontend work or ship a feature end-to-end.

What we're looking for

• Strong, proven frontend expertise — production experience architecting and building complex frontend applications.
• Comfortable being the most senior frontend voice in the room, including pushing back on design or product where needed.
• Some backend experience and a genuine willingness to work in a Python codebase.
• Experience mentoring other engineers, ideally including people earlier in their career than you.

Nice to have, not required:

• Experience building or integrating payment products.
• Experience in a growth, onboarding, or activation-focused product surface.

What you should be aware of

• The team is still forming, so you're inheriting mentoring responsibility for people who haven't been hired yet.
• Remote-first, high autonomy, no hand-holding — you're expected to set your own standards.
• Early-stage team means some ambiguity on process and tooling.

A typical interview process

• An initial intro call with a Talent Partner
• An interview with the Hiring Manager
• Challenge Stage - Contextualised to the role
• A final, values-alignment interview

Our benefits

• Fully remote and globally distributed team
• Competitive share options
• Uncapped holiday, with 25 days minimum to be taken
• Co-working space access across major cities
• Workations & Company Retreat
• The best equipment for your role
• £500 towards your home office setup
• Generous learning budget
• Private Medical Insurance and additional perks