Senior Engineer - Growth (FE)

Role Description

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.

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.
• You’ll spend roughly 80% of your hands-on codebase time on frontend and 20% on backend. That split is a guide, not a rule, and it will shift in either direction depending on what we're focused on at the time.
• Partner closely with Design to take onboarding and platform experience from concept to production, shaping the details that decide whether a merchant's first steps with Primer feels effortless or frustrating.
• Mentor and raise the bar for the engineers who join the team; you're the person newer engineers learn frontend craft from.
• Set frontend conventions and quality standards for a team that's still being built — architecture reviews, code quality, testing approach, all early enough that your calls stick.
• Contribute to the Python backend where it's needed to unblock frontend work or ship a feature end to end, without needing deep backend expertise going in.

Qualifications

• Strong, proven frontend expertise — production experience architecting and building complex frontend applications, not just consuming a design system.
• Comfortable being the most senior frontend voice in the room, including pushing back on design or product where the frontend reality demands it.
• Some backend experience and a genuine willingness to work in a Python codebase — depth isn't required, but you shouldn't be reluctant to touch it.
• Experience mentoring other engineers, ideally including people earlier in their career than you.
• Nice to have, not required: Experience building or integrating payment products.
• Nice to have, not required: Experience in a growth, onboarding, or activation-focused product surface.

Requirements

• The team is still forming, so you're inheriting mentoring responsibility for people who haven't been hired yet — the "who" of who you're mentoring is still unknown.
• Remote-first, high autonomy, no hand-holding — you're expected to set your own standards, not follow someone else's playbook.
• Early-stage team means some ambiguity on process and tooling that a more established team would already have solved.

Benefits

• We are fully remote and globally distributed; and have been since day one.
• 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.
• A broad set of additional perks and benefits (depending on location).