Principal Java Engineer

JR United Kingdom; Belfast; On-site; GBP 60,000 - 80,000; Full time

Job summary

A cutting-edge payments technology company is seeking a Principal Software Engineer to join their team in Belfast. This role involves designing and maintaining backend services critical to payment systems while collaborating with other teams to address real merchant challenges. The ideal candidate will have significant experience with Java and backend system design, thrive in a fast-paced environment, and contribute to a strong engineering culture focused on meaningful outcomes.

Benefits

Small teams and real ownership

Focus on outcomes, not just output

Strong engineering culture

Qualifications

• 8–10 years of software engineering experience.
• Strong hands-on experience with Java and backend system design.
• Pragmatic mindset balancing clean design with fast delivery.

Responsibilities

• Design, build, and maintain backend services for payment infrastructure.
• Collaborate to turn merchant challenges into technical solutions.
• Champion software quality through clean code and automated testing.

Skills

Java

Backend system design

Systems integration

Messaging middleware

Distributed architecture

Clean design

Job description

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Principal Software Engineer – Shape the Future of Payments

We're hiring on behalf of an innovative payments technology company building the next generation of merchant-first systems. If you're a backend-focused engineer who values autonomy, clarity of purpose, and building products that matter, read on.

The Role

Join a high-impact team delivering scalable backend and portal solutions for a modern payment ecosystem. You'll work in a lean, collaborative environment where your input shapes real outcomes — not just code.

What You’ll Do

• Design, build, and maintain backend services that power critical payment infrastructure
• Collaborate cross-functionally to turn real merchant challenges into elegant technical solutions
• Champion software quality through clean code, automated testing, and CI/CD
• Contribute to architecture, planning, and team best practices
• Own projects end-to-end — from concept to deployment

What You Bring

• 8–10 years of software engineering experience
• Strong hands-on experience with Java and backend system design
• Familiarity with systems integration, messaging middleware, and distributed architecture
• A pragmatic mindset — you balance clean design with delivering value fast
• Comfortable working solo or as part of a team, with a proactive and collaborative approach

Why Join

• Small teams, real ownership, no red tape
• Focus on outcomes, not just output
• Strong engineering culture that values learning, experimentation, and doing things the right way
• Build software that solves meaningful, real-world problems for businesses

If you would like to have a confidential conversation and find out more about this opportunity, then get in touch