Software Engineer, Backend

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.

Unfortunately we are unable to offer sponsorships or relocation packages at this time.

As it stands, we currently have multiple teams hiring for backend engineers. Our talent team will be able to provide you with more information on what these teams cover at the interview stage.

Reporting to an Engineering Manager, you’ll join a team of backend, full-stack, and frontend engineers all working together alongside our Product team.

The team adopts a ‘you build it, you own it’ approach, working with infrastructure, doing their own testing and QA.

Our tech stack includes: Python, Typescript, React, AWS, Kubernetes and Terraform, amongst lots of other things.

• Designing and implementing core backend services for high performance, complex distributed systems

• Driving and using modern development practices such as BDD and TDD would be highly beneficial

• Creating clear, modern, well tested code

• Collaborating across teams in a product-driven environment

• Taking ownership of key technology decisions, building for scale and optimising for output

• Conducting code reviews and continuously look at ways of improving our ways of working

• Creating detailed internal documentation for the projects you work on

• Experience coding Python in modern, complex technical environments

• Experience with testing frameworks and a good approach to writing testable, maintainable code.

• Understanding of the entire development process (design, development and deployment)

• Highly motivated self-starter who values autonomy and getting things done

• Excellent verbal and written communication skills

• Experience working in a fast-paced environment.

• You will need to be based in: Poland, Portugal, Hungary, Romania or South Africa.

• 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

• 30 minute call with a Talent Partner

• 45 minute interview with an Engineering Manager

• 90 minute pair programming interview

• 60 minute final stage values-alignment interview

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

Our 2025 Product Showcase

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.

🌍 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)

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.