Senior Software Engineer

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:

• Part of the Engineering Excellence domain, building internal tools, services and infrastructure that enable teams to ship safely and quickly.
• Hands-on programming work – coding, pair programming, mobbing, testing and shipping functionality.
• Act as a technical lead and work with Principal and Lead Engineers to design, build, and deliver platform capabilities for other teams.
• Lead complex features from conception to completion with high quality and minimal oversight.
• Mentor less-experienced engineers and conduct thorough reviews of code and documentation.

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.
• Thriving in autonomous, agile environments where innovation happens daily.
• AI-conscious – habitually using tools like Copilot, understanding their pros and cons, and guiding others in safe and effective use.
• Strong communication skills – written and verbal; clarity in documentation, proposals, and conversations.
• Ability to surface the effects of engineering decisions 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.

Additional desirable skills:

• Crafting modern .NET applications in C# and designing robust REST APIs.
• Navigating Platform-as-a-Service 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.

Equal Opportunity Employment Statement:

At NewDay, we value all types of diversity. We’re an equal-opportunity employer and believe that our differences create a vibrant, authentic working culture. We want all our colleagues to feel able to bring their whole selves to work. We don’t discriminate on the basis of protected characteristics or identities. We make sure that every job is crafted to be inclusive and that people with disabilities or caring responsibilities can take part in the application and interview process. Tell us if you need accommodations: We’ll put reasonable adjustments in place to support you.

We work with Textio to make our job design and hiring inclusive.

General information:

Permanent – no on-call required. Join us to help people move forward with credit and help our colleagues move their careers forward too. Through innovative consumer credit and embedded finance products powered by groundbreaking technology, we deliver over 300 million transactions every year.