Software Engineer III, Backend – Account Experience

Primer

Backend Engineer L3 contributing to the Merchant platform for payment solutions at Primer. Partnering in a high-calibre team to enhance the backend services and shape architecture decisions.

Posted 5/29/2026full-timeRemote • 🇵🇱 PolandJuniorMid-LevelWebsite

Tech Stack

Tools & technologies

Distributed Systems

About the role

Key responsibilities & impact

Take full ownership of backend features from scoping through to production, keeping the team informed on progress, risks, and blockers without being chased.
Design and deliver backend services that handle real payment volume, with a strong focus on reliability, performance, and correctness at scale.
Contribute to architecture discussions, bring proposals to the engineering council, and advocate for clear service contracts and simple, maintainable system design.
Monitor the production impact of your own work, identify issues early, and drive incidents to resolution when they arise.
Write code that your peers consider high quality: production-ready, well-considered on error paths, and built with the next engineer in mind.
Actively contribute to Primer's engineering standards, raise concerns when you see gaps, and help the team hold a consistent bar.
Collaborate with engineers across the Account Experience team on scoping sessions, code reviews, and technical decisions that shape how the system evolves.

Requirements

What you’ll need

Solid backend engineering experience, with the ability to take ambiguous requirements and deliver working, production-ready software with minimal direction.
Strong grasp of distributed systems fundamentals: you understand why things fail in production and you build accordingly.
Comfortable working with REST APIs and the patterns that make services reliable, observable, and easy to reason about.
Experience owning work end to end — not just writing code but thinking about monitoring, rollout, and what happens after deployment.
The confidence to contribute to architecture discussions, ask the right questions, and push back when a design decision doesn't make sense.
Experience in a payments, fintech, or infrastructure context is a plus, though depth of engineering matters more than the specific industry.

Benefits

Comp & perks

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)

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

backend engineeringdistributed systemsREST APIsproduction-ready softwaremonitoringsystem designservice contractserror handlingcode reviewstechnical decision making

Soft Skills

ownershipcommunicationcollaborationproblem-solvingadvocacyconfidencecritical thinkingattention to detailproactiveadaptability