Software Engineer, Frontend

Primer is the world's first unified payment infrastructure, founded by former leaders of Braintree and PayPal. We unify fragmented payment and finance systems into a single, intelligent platform, automating the entire payments lifecycle from acceptance and orchestration to reconciliation, FX, and financial operations.

Trusted by leading merchants worldwide, we give finance, payments, and engineering teams the tools to move faster, reduce complexity, and unlock growth. Our open, modular platform connects to 150+ services across the payments ecosystem, while our expanding CFO product suite brings unified reconciliation, FX management, and financial visibility across markets and currencies.

Backed by Accel, Balderton, ICONIQ, and Tencent, we're setting a new standard for how the world moves money.

Which team will you be joining?

You'll be joining the Acceptance team — the engineering domain responsible for the foundation of Primer's payment platform. Acceptance processes 10 million transactions a day across providers, markets, and payment methods. The team owns everything from the core payment infrastructure to the merchant-facing APIs, SDKs, and checkout experiences that sit on top of it.

Frontend at this level in Acceptance means working on surfaces that real merchants ship to their customers — composable checkout components, developer tooling, and the UI layer that makes a complex payments platform actually usable. The quality bar is high because the stakes are real.

You'll report to an Engineering Manager and work closely with backend engineers, product, and design across a team that values end-to-end ownership and engineers who care about what they build.

🔍 What will you be doing?

• Own frontend projects end-to-end — from scoping through to production — across Acceptance's payment surfaces, checkout components, and merchant-facing tooling.

• Lead architectural decisions on the frontend systems you work on, contributing to design sessions and producing RFCs and ADRs with minimal reliance on more senior engineers.

• Build UI that is composable, performant, and adaptable — payment experiences that merchants can configure and extend to fit their own products.

• Monitor the impact of your work in production, use metrics and dashboards to catch issues proactively, and take full ownership when things need to be fixed.

• Hold a high quality bar for your own code and raise concerns when you see things in the codebase that don't meet it.

• Contribute to incident response when it matters — taking the lead, driving to resolution, and keeping stakeholders informed throughout.

• Share knowledge actively and help raise the quality and confidence of the engineers around you.

👀 What we'd love to see

• Solid frontend engineering experience, with a track record of independently delivering production-grade work across the full lifecycle.

• Extensive experience with Typescript and ideally web components.

• Comfortable taking on a project, scoping it, planning the architecture, and seeing it through without needing to be directed at each stage.

• Strong understanding of how to build accessible, performant, maintainable UI at scale — ideally in a context where quality directly affects end users or downstream integrations.

• Able to contribute meaningfully to architecture discussions and articulate trade-offs clearly.

• Writes clean, well-tested code that peers would consider high quality — and holds yourself to that standard consistently.

• Understands the user and business context behind the work, not just the technical brief.

• Communicates clearly and directly, especially in async-first environments.

Nice to have:

• Experience building SDKs, embeddable components, or developer-facing tooling.

• Familiarity with payments, checkout flows, or high-availability frontend systems.

🚫 You may not like it here if:

• You enjoy working in an office-setting, we are remote-first and always will be!

• You are not comfortable with shifting context and navigating ambiguity

• You don’t enjoy testing your code, we have no testers or QA’s here at Primer

✅ Our interview process

• 30 minutes with a Talent Partner

• 1 hour with an Engineering Manager

• 90 minute Coding interview

• 90 minute System Design interview

• 1 hour Values interview

What’s life like at Primer?

We’ve been recognised as a top global employer, #1 in FinTech for ‘flexibility’!

We’re building a culture where people can come and do their best work and enjoy it. We want our people to be proud of the impact that they have at Primer, and of the work that they are doing. You will be working with a team of people who are mission-driven, smart, and reflective, and who are invested in building exceptional products and delivering success for our merchants (and we also know how to have fun along the way).

We work remotely. We believe that building a successful, profitable company goes beyond proximity. We invest in our relationships with each other through great remote working practices and thoughtfully designed face-to-face time together. Our heads-together time comes in the form of workstations, our annual company retreat, and co-working space access worldwide.

Finally, let’s go ahead and say it. The work that we do is challenging. Startups are a challenge, building category defining products is a challenge. You should be prepared for a challenge at Primer. But, there’s a big difference between a challenge and a struggle. The key difference is that the right challenge comes with the right support structures, an acceptance that not everything always goes to plan, a collaborative environment, and a great team around you. It’s never a challenge that you will 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

📅 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 past experience doesn’t align perfectly with every qualification in the job description, 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, regardless of background or beliefs.

Primer adopts a zero-tolerance approach to discrimination. We are committed to providing equal opportunities to all current and prospective employees regardless of age, disability, sex, sexual orientation, pregnancy and maternity, race or ethnicity, religion or belief, gender identity, or marriage and civil partnership.