Principal Software Engineer (Payments)

JR United Kingdom; Cardiff; On-site; GBP 60,000 - 85,000; Full time

Job summary

A leading company in Cardiff is seeking a Principal Software Engineer II to lead technical direction and architect solutions in a growing team. The role emphasizes hands-on coding, mentoring, and developing scalable systems, focusing on delivering value and encouraging innovation within empowered teams.

Qualifications

• 10+ years’ experience in software engineering and architecture.
• Strong skills in .NET, Java, or similar languages.
• Hands-on knowledge of SQL, middleware, caching, system integration.

Responsibilities

• Lead technical direction across platform capabilities (APIs, billing).
• Mentor developers and contribute to architectural decisions.
• Stay 50% hands-on with critical coding tasks related to strategic goals.

Skills

.NET

Java

SQL

Middleware

Caching

System Integration

Performance Issues

Scalability

Communication

Stakeholder Engagement

Education

Bachelor's degree in Computer Science or related field

Job description

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Principal Software Engineer (Payments), cardiff

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Client:

Ocho

Location:

cardiff, United Kingdom

Job Category:

Other

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EU work permit required:

Yes

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Job Views:

2

Posted:

06.06.2025

Expiry Date:

21.07.2025

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Job Description:

Principal Software Engineer II

Are you a senior engineer who wants to stay hands-on while shaping the technical direction of a growing team? Do you enjoy designing and delivering complex systems that have real impact? If so, read on.

We’re building the next generation of tools to support a fast-moving, merchant-first ecosystem. We value empowered teams, practical thinking, and outcome-driven engineering—and we’re looking for someone who shares these values.

What We Prioritise:

• Small teams, real outcomes – Clear goals, the right tools, minimal bureaucracy.
• Growth mindset – Encouraging innovation, skill development, and cross-team learning.
• Solving real problems – Focused on delivering value through practical, scalable solutions.

The Role:

As Principal Software Engineer II, you’ll lead technical direction across a range of platform capabilities (e.g., APIs, billing, settlement). You’ll be responsible for architectural decisions, mentoring teams, and contributing to key delivery efforts—staying 50% hands-on with the code.

Key Responsibilities:

• Define and evolve engineering practices and architecture across teams.
• Own and contribute to technical strategy, standards, and documentation.
• Identify improvement opportunities and lead cross-team initiatives.
• Provide technical leadership and mentorship to developers.
• Guide technology decisions, including build vs. buy assessments.
• Stay hands-on with critical coding tasks tied to strategic goals.

Requirements:

• 10+ years’ experience in software engineering and architecture.
• Strong skills in .NET, Java, or similar languages; SaaS/API experience preferred.
• Hands-on knowledge of SQL, middleware, caching, system integration.
• Track record of addressing performance/scalability issues.
• Experience in mentoring and leading technical teams.
• Excellent communication skills and stakeholder engagement.
• Comfortable working in a fast-moving, evolving environment.

Payments experience is a bonus, but not essential.

Please reach out to Brendan McCrory with any further questions.