Senior Engineer, Fullstack - Growth

Primer.io; United States; Remote; USD 140,000 - 190,000; Full time

Benefits offered by this job

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Uncapped holiday

Remote work

Co-working spaces

Home office stipend

Learning budget

Company retreat

Private Medical Insurance

Job summary

Primer is a remote-first, globally distributed company building the payments layer for leading merchants. You will own frontend architecture for the self-serve onboarding and platform experience, with a high degree of ownership over how it’s built and shipped.

You’ll split time between frontend and backend work, mentoring engineers and setting conventions. This role offers a high-autonomy culture with strong onboarding and a collaborative environment.

Qualifications

• Strong, proven frontend expertise with experience architecting and building complex frontend applications.
• Willing to be the most senior frontend voice, able to push back on design/product when needed.
• Some backend experience and willingness to work in a Python codebase.

Responsibilities

• Lead frontend architecture and technical direction for the onboarding and platform experience.
• Spend about 80% of time on frontend and 20% on backend; split may vary by project.
• Partner with Design to shape onboarding and platform experiences from concept to production.
• Mentor and raise the bar for engineers joining the team.
• Set frontend conventions and quality standards for an evolving team.
• Contribute to the Python backend where needed to unblock frontend work.

Skills

Frontend architecture

Technical leadership

Mentoring

Python backend familiarity

Code ownership

Tools

Python

Job description

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 >

Read up on our $100m Series C

Learn more about our culture >

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:

• 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

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

What’s the culture like at Primer?

We’re building a culture where people can do their best work and be proud of the impact they have. You’ll be working with people who are mission-driven, smart, and reflective, and who are genuinely invested in building exceptional products and delivering success for our merchants.

We work remotely, and have done since day one. We believe that building a successful, profitable company goes beyond proximity. We invest in our relationships through great remote working practices and thoughtfully designed face-to-face time, including workations, our annual company retreat, and access to co-working spaces across most major cities.

The work is challenging. Scaleups are a challenge, and building category-defining products is a challenge. But there’s a meaningful difference between a challenge and a struggle. At Primer, the right challenge comes with the right support: strong onboarding, a collaborative environment, and a team that is genuinely invested in your success. It’s never something you face alone.

Our 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)

Don’t meet every single requirement?

At Primer, we’re dedicated to building a diverse, inclusive, and authentic workplace. If you’re excited about this role but your experience doesn’t align perfectly with every qualification listed, we encourage you to apply. You may be the right candidate for this or other roles.

Primer is committed to the equal treatment of all current and prospective employees and adopts a zero-tolerance approach to discrimination, regardless of age, disability, sex, sexual orientation, pregnancy and maternity, race or ethnicity, religion or belief, gender identity, marriage and civil partnership, or any other background or belief.