Principal Software Engineer

Our client is a UK-based B2B software company specialising in technology for the energy and commodity markets.

They are looking for a hands-on Principal Software Engineer to join a small engineering team building complex software for the European energy and trading market.

This is a technical leadership role first, with people management alongside it. You’ll continue writing and reviewing production code every week while also leading and developing a small team of engineers.

You’ll take ownership of the technical direction of a core product area, working from well-defined requirements through design, development and delivery.

Key responsibilities include:

• Write, review and ship production code regularly using C#/.NET and Azure
• Lead technical design and make architecture decisions, balancing delivery speed with long-term maintainability
• Design, develop, refactor, debug, test and support high-quality software
• Line-manage and mentor a small team of engineers
• Lead code and design reviews and constructively challenge technical decisions
• Own automated unit testing and promote strong engineering practices
• Identify root causes of complex technical issues and implement long-term solutions
• Contribute to planning, estimation and requirements refinement

What We’re Looking For

• 10+ years of commercial software engineering experience
• Strong, recent and hands-on C#/.NET experience, including .NET Core/Web API
• Experience with Azure and cloud-based software development
• Strong system design and software architecture skills
• Experience with SQL and NoSQL databases
• Docker, containerisation and orchestration experience
• Strong understanding of SOLID principles, design patterns and integration patterns
• Experience with automated testing and code reviews
• Proven people management / line management experience while remaining hands-on technically
• Fluent English and strong communication skills
• A stable career history and experience working in complex products

Nice to Have

• Experience in fintech, payments, trading, energy or another complex/regulated domain

• Experience in a smaller product-focused company

• Infrastructure as Code, such as Terraform, Bicep or ARM

• GitHub Actions, SonarCloud or CodeQL

• Experience with multi-tenant SaaS products

• TypeScript, Angular, JavaScript or Python

• Fully remote within India

• Competitive salary + annual bonus

• Private medical insurance

• Flexible working hours

• 24 days’ annual leave plus bank holidays

• Regular in-person team gatherings with travel and accommodation covered

• Opportunity to work on complex software used in live European energy markets