Senior Engineer, Fullstack - Growth

About the role

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.

Watch our showcase > https://primer.io/the-primer-showcase

Read up on our $100m Series C https://www.primer.io/blog/series-c

Learn more about our culture > https://primer.io/careers

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 — always will be.

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

What we're looking for

- 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

- Experience in a growth, onboarding, or activation-focused product surface

What you should be aware of: