Senior Software Engineer

Salary: £65,000 - 105,000 per year

Requirements:

• We look for strong writing and maintenance of tests throughout the SDLC at all levels.
• We value experience implementing continuous delivery practices to ship quality code safely and in a timely manner.
• We look for the ability to contribute to system architecture decisions with a focus on resiliency, scalability, and maintainability.
• We need people who thrive in autonomous, agile environments where innovation happens daily.
• We value an AI-conscious approach, including habitual use of tools like Copilot, an understanding of their pros and cons, and the ability to guide others in safe, effective use.
• We look for strong written and verbal communication skills, with clarity in documentation, proposals, and conversations.
• We want someone able to surface the effects engineering decisions have across systems and push back against potential red flags.
• We value an enabler mindset and an interest in making other engineers happier through tooling, services, and documentation.
• We look for honesty, pragmatism, and openness to feedback.
• We value experience with observability, metrics, CI/CD, data analysis, or shared developer tooling.
• It is a plus to have experience crafting modern .NET applications in C# and designing robust REST APIs.
• It is a plus to have experience navigating Platform-as-a-Service cloud computing environments, particularly Azure.
• It is a plus to be a .NET/C# or polyglot engineer with pragmatic system thinking and interest in abstracted system-level understanding.
• It is a plus to have experience contributing to engineering principles and technical direction across teams.
• It is a plus to have experience recruiting and onboarding engineers.

Responsibilities:

• We work hands-on across programming, pair programming, mobbing, testing, and shipping functionality.
• We act as technical leads and work with Principal Engineers and Lead Engineers to design, build, and deliver platform capabilities for other teams to use.
• We lead complex features from conception to completion with high quality and minimal oversight.
• We mentor less-experienced engineers and conduct thorough reviews of code and documentation.
• We build internal tools, services, and infrastructure that enable engineering teams to ship safely and quickly.

Technologies:

• AI
• Azure
• C#
• CI/CD
• Cloud
• Copilot
• Support
• LESS
• REST
• ASP.NET
• PaaS

More:

We are NewDay, one of the UKs leading digital consumer finance providers, on a mission to help people move forward with credit and supporting over 6 million customers every day. You may know our own-brand credit cards such as Aqua, Marbles, and Bip, as well as our co-branded retail credit cards with John Lewis & Partners, Argos, and AO. This Senior Software Engineer role sits in our Engineering Excellence domain, where we build the internal tools, services, and infrastructure that help our engineering teams ship safely and quickly. The role is permanent, full time, based in London, with no on-call required. We offer 26 days holiday rising to 30 with service, a holiday buy scheme, double matched pension up to 14% from NewDay, annual performance bonuses, private medical insurance with Bupa including mental health support and cancer care, 26 weeks paid maternity, adoption and shared parental leave, and free breakfast and lunch in the office every day provided by our in-house chefs. We are an equal opportunity employer, value diversity, and aim to make our hiring inclusive and accessible.

last updated 35 week of 2026