Senior software engineer i Work, Jobs in Peterlee, Dur (with Salaries)

We're looking for a Senior Developer/engineer who's genuinely ready for a senior role — someone who can own the full software lifecycle, shape technical direction, and raise the bar for the team around them.

This isn't a stepping stone. It's a role where your experience and instincts will matter from day one. You'll be working on platform systems that power one of the UK's biggest gaming sites — everything built in-house, with real complexity and real stakes.

You'll be expected to drive quality, influence architecture decisions, and be a technical reference point for your peers. But you'll also be coding — we're not looking for someone who's stepped too far from the work. The best senior developers here do both.

What you'll be doing

Owning the full software delivery lifecycle — from requirements through to production
Designing and delivering robust, scalable solutions in C# across tombola's platform
Driving engineering standards — code quality, testing practices, documentation
Influencing technical direction and contributing to architectural decisions
Mentoring and coaching developers at all levels
Leading code reviews and pair programming sessions
Working closely with stakeholders and non-technical colleagues to shape requirements
Monitoring application health and leading performance investigations
Contributing to agile ceremonies — standups, sprint planning, technical refinements
Ensuring compliance and regulatory considerations are built into delivery

What we're looking for

Proven, senior-level C# skills — we're looking for someone exceptional here
Strong knowledge of the .NET ecosystem — both legacy frameworks and modern .NET
Experience owning work end-to-end, from requirements through to live systems
Deep understanding of testing methodologies — unit, integration, and beyond
Ability to design software to a high technical standard, collaboratively
Experience mentoring others and influencing team direction
Excellent communication across technical and non-technical audiences
Understanding of compliance, regulations, and how they affect software delivery

Nice to haves

SQL and data layer experience
Experience working across both backend and frontend codebases
Involvement in hiring and technical interviewing

Why tombola? ️

At tombola, senior developers have genuine influence. Technology decisions are never handed down from above — they're made by the people closest to the work. You'll have real autonomy, real ownership, and the chance to help shape how we build for years to come.

We're a business that's genuinely driven by technology. Every product, every system, every feature — built in-house. That means your work has real impact, and the team you'll join knows and cares about that.

We've also got great benefits. Head to our careers site to see the full picture.

At tombola we know that our differences make us stronger and that thinking differently is key to long-term success. We work hard to create a culture of inclusivity where everyone is free to be themselves. We welcome applications from all backgrounds.

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