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. Requirements 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 Benefits 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