Senior Backend Engineer

Role:

Senior Backend Engineer (Product Platforms)

About You:

Are you the kind of engineer who enjoys owning complex backend systems and making them more reliable, scalable and maintainable? Do you thrive on solving production challenges, improving operational resilience and building software that directly impacts customers and business performance? Are you comfortable taking responsibility for systems you did not originally build, understanding how they work, identifying opportunities for improvement and confidently leading technical delivery? If you enjoy solving difficult engineering problems and want to play a key role in one of the UK's fastest-growing companies, DFYNE could be exactly where you belong.

About DFYNE:

A picture paints a thousand words... and we're sure you don't want to sit here reading a corporate essay about who we are. Honestly, how can you really get under the skin of DFYNE from a few lines on a screen? So instead, go have a look for yourself, see what we're about, what we stand for, and why people love us: www.dfyne.com .

About the role - DFYNE Your Career:

Before I tell you more about the role, let me introduce myself. I'm Bruce, Head of Development at DFYNE, and I'm looking for a Senior Backend Engineer who can help us scale and strengthen the technology that powers our business. This is a hands-on engineering role sitting within our engineering team and reporting directly to the Head of Development. You will be trusted to take ownership of key backend platforms, improve reliability and performance, contribute to architectural discussions and deliver robust software that can support DFYNE's continued growth. You'll work closely with Product, Engineering and Operations teams while helping to raise technical standards across the wider engineering function.

Attitude:

• Ownership mentality
• Builder mindset
• Technical curiosity
• Calm under pressure
• Continuous improvement

Key Responsibilities:

• Design, develop and maintain scalable backend services and APIs.
• Own critical production systems and ensure reliability, performance and maintainability.
• Take ownership of existing platforms and services, gaining a deep understanding of how they operate and identifying opportunities to improve reliability, performance and maintainability.
• Troubleshoot and resolve complex technical and operational issues.
• Participate in incident response and post-incident learning activities.
• Support architectural decisions that improve scalability and resilience.
• Collaborate with Product, Engineering and Operational stakeholders.
• Contribute to engineering standards, code review practices, release discipline and software delivery best practice.
• Mentor less experienced engineers and support team development.
• Improve observability, monitoring and operational visibility.
• Identify and address technical debt and system risks.
• Support integrations with third-party services, logistics partners and business systems.
• Contribute to continuous improvement across engineering processes.

Skills & Experience:

• Significant commercial experience as a Backend Engineer, including ownership of production systems in a commercial environment.
• Strong TypeScript or Python development experience.
• Experience building and operating production systems at scale.
• Strong understanding of distributed systems and API design.
• Experience working with relational databases and performance optimisation.
• Experience working within cloud environments, ideally Google Cloud Platform.
• Strong debugging and problem-solving capabilities.
• Experience supporting production services and operational environments.
• Excellent communication and stakeholder management skills.
• Proven ability to deliver business-critical software.

Nice to Have:

• E-commerce experience.
• Logistics or fulfilment systems experience.
• Payment or commission platform experience.
• Terraform and Infrastructure as Code.
• Google Cloud Platform.
• Next.js or tRPC familiarity.
• FastAPI experience.

So, what's in it for you? If you've made it this far down without being put off, brilliant. I'd genuinely love to hear from you. Beyond joining a work family and a genuinely great place to build your career, you'll have the opportunity to build technology that directly impacts one of the UK's fastest-growing businesses. You'll work on meaningful systems, solve challenging engineering problems and have genuine ownership from day one. You'll be part of a high challenge; high reward culture.

Salary starting from £65K per year.