Overview

.Net Software Engineer - Senior & Principal at Primis, Belfast, Northern Ireland, United Kingdom.

This role offers opportunities to work across multiple seniorities in a .NET team, from Senior Software Engineer through to Principal Engineer. The role can focus on deep coding, or evolve into a more strategic, cross-team position with real impact on the platform and engineering practices.

You’ll be joining a fast-moving tech company building a merchant-first ecosystem where quality, scalability and resilience are priorities. The environment blends a modern cloud stack with complex integration challenges, providing scope to shape core platform capabilities and influence engineering practices across the business.

These are high-impact, hands-on roles: designing and building APIs, portals and services, optimizing performance, and embedding best practice in how software is delivered. You’ll collaborate closely with engineers, architects and product teams to solve real problems the right way.

Tech environment

• Event-driven and service-oriented architecture
• SQL, caching, message brokers (RabbitMQ)

Responsibilities

• Design and build APIs, portals and services with a focus on scalability and reliability
• Optimize performance and embed engineering best practices in delivery
• Collaborate with engineers, architects and product teams to solve real problems

What we’re looking for

• Senior Engineers with 5+ years’ experience delivering enterprise-grade systems
• Principals with 10+ years’ experience, blending deep coding expertise with architectural leadership
• Strong OO design (SOLID), refactoring, and system integration experience
• Ability to influence technical direction while staying hands-on in code
• Remote-first within the UK & Ireland
• Private family healthcare
• Clear growth path – without leaving the code behind

Seniority level

• Mid-Senior level

Employment type

• Full-time

Job function

• Information Technology and Engineering

Industries

• IT Services and IT Consulting
• Financial Services
• Staffing and Recruiting

Note: Referrals increase your chances of interviewing at Primis.