Senior Software Engineer

Mission Statement & Summary 

NewDay is one of the UK's leading digital consumer finance providers. We're on a mission to help people move forward with credit, supporting over 6 million customers every day! You may have heard of our own brand credit cards like Aqua, Marbles or Bip, or our co-branded retail credit cards with John Lewis & Partners, Argos and AO.

As a Senior Software Engineer, you play a pivotal role in designing, developing, and maintaining high-quality software solutions. You collaborate closely with cross-functional teams, provide mentorship to other engineers, and contribute to the continuous improvement of engineering practices. Your expertise ensures the delivery of secure, reliable, and scalable products that align with business objectives. 

How you’ll contribute 

• You’ll be part of the Engineering Excellence domain. We build the internal tools, services, and infrastructure that enable our engineering teams to ship safely and quickly. 

• Hands-on programming work – coding, pair programming, mobbing, testing and shipping functionality. 

• You will be acting as a technical lead and working with Principal Engineers and Lead Engineers to design, build and deliver platform capabilities for other teams to use. 

• Leading complex features from conception to completion with high quality and minimal oversight. 

• Mentoring less-experienced engineers and conducting thorough reviews of code and documentation. 

We're looking for these essential skills 

• Writing and maintaining tests throughout the SDLC at all levels. 

• Implementing continuous delivery practices to ship quality code safely and in a timely manner. 

• Contributing to system architecture decisions, ensuring resiliency, scalability and maintainability. 

• Thrives in autonomous, agile environments where innovation happens daily. 

• AI-conscious – habitually using tools like Copilot, understanding their pros and cons, and able to guide others in safe, effective use. 

• Strong communication skills – written and verbal. Clarity in documentation, proposals, and conversations. Able to surface the effects engineering decisions have across systems and push back against potential red flags. 

• Enabler mindset – enjoys making other engineers happier through tooling, services and documentation. Honest, pragmatic, and open to feedback. 

• Experience with observability, metrics, CI/CD, data analysis, or shared developer tooling. No on call required. 

Its a plus if you also have these skills

• Crafting modern .NET applications in C# and designing robust REST APIs 

• Navigating Platform-as-a-Service (PaaS) cloud computing environments, we use Azure. 

• .NET/C# or polyglot engineers with pragmatic system thinking – interested in abstracted system-level understanding over any specific tech stack. 

• Contributing to engineering principles and technical direction across teams.  

• Experience recruiting and onboarding engineers

What's in it for you?

• 26 days holiday, rising to 30 with service

• A holiday buy scheme (up to 5 extra days)

• Double matched pension, with up to 14% from NewDay

• Generous annual performance bonuses

• Private medical insurance with Bupa, including mental health support and cancer care

• 26 weeks paid maternity, adoption and shared parental leave

• Free breakfast and lunch in the office every day, provided by our in-house chefs

…and more, which you can explore here!

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