Software Engineer III, Backend - Account Experience

Role Description

The merchant experience is only as good as the platform behind it. In the Account Experience team, we build and own the full platform that merchants use to interact with Primer — from initial setup through to day-to-day operations, and increasingly through Primer AI Companion as a first-class interface. This team covers:

• Primer Companion
• Merchant Account Setup
• Monitors
• Workflows
• Auditing
• Cross-cutting platform concerns that keep the merchant experience cohesive and consistent.

As a Backend Engineer L3, you will work within a small, high-calibre team of engineers who own their work end to end. You'll report into the Engineering Manager for Account Experience and contribute to systems that power the merchant platform at scale.

What will you be doing?

• 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.

Qualifications

• 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.

Requirements

• 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.

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).