As a Senior Software Engineer at NewDay, You’ll design and deliver high-quality C#/.NET applications, create robust APIs, and contribute to event-driven architectures in a hands-on role at the core of our tech ecosystem.
Working in a fast-paced, agile team, you’ll take solutions from code to production and help evolve our Stratus platform—driving reuse, consistency and engineering excellence.
Your impact: faster delivery, better performance, and scalable, future-ready systems that support NewDay’s growth.
How you'll contribute
Collaborate with engineers to build and deliver new platform capabilities.
Engage in hands-on programming, including coding, pair programming, and testing.
Participate in regular scrum ceremonies, contributing to the agile development process.
Work closely with the technical lead to build out Stratus Capabilities for other teams to leverage.
Implement Continuous Delivery practices to ensure fast and high-quality code deployment.
Leverage AI tools (e.g. GitHub Copilot) thoughtfully to improve efficiency and code quality
Own what you build – overseeing the performance and resilience of our systems in production.
Key Skills & Responsibilities
Proficiency in crafting modern .NET applications using C# 12+ (including .NET 8+ and NuGet).
Experience in crafting robust HTTP APIs with tools such as ASP.NET MVC, Web API, Carter, or Nancy.
Experience navigating Platform-as-a-Service (PaaS) cloud environments.
Proven experience with Event-Driven Architecture, designing systems that react in real-time.
Experience building and maintaining CI/CD pipelines (e.g. GitHub Actions, Octopus)
Ability to thrive in autonomous, agile environments where daily innovation is the norm.
Preferred Skills and Experience
Experience working with other technologies aside from .NET ( e.g. Java, Node)
Proven experience working with Microsoft Azure
Knowledge of Event-Sourced Systems, building architectures that track every state change.
Experience working with distributed, scalable database solutions.
Strong understanding of system design principles and modern engineering tooling.
Familiarity with Event Sourced architectures.
Your Impact
By joining NewDay Cards Ltd, you will contribute significantly to delivering top-tier financial solutions. You will be involved in crafting the future of our technology stack and promoting success through collaboration and innovation. You will work on demanding projects that call for creativity and technical skill, keeping us competitive.
Submit your application today to become a member of a team that recognizes your efforts and fosters your professional advancement. We look forward to discovering how you can contribute to accomplishing our ambitious aims and making a difference!
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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.
PermanentJob Profile Summary – Senior Engineer (.Net).docxSkills Required
- Proficiency in C# 12+ and .NET 8+ (including NuGet).
- Experience building HTTP APIs with ASP.NET MVC, Web API, Carter, or Nancy.
- Experience working in Platform-as-a-Service (PaaS) cloud environments.
- Proven experience with Event-Driven Architecture.
- Experience building and maintaining CI/CD pipelines (e.g., GitHub Actions, Octopus).
- Implementing Continuous Delivery practices and owning production performance and resilience.
- Experience working in agile teams and participating in scrum ceremonies.
- Familiarity using AI-assisted coding tools (e.g., GitHub Copilot).
- Experience with Java or Node (preferred).
- Proven experience with Microsoft Azure (preferred).
- Knowledge of Event-Sourced systems (preferred).
- Experience with distributed, scalable database solutions (preferred).
- Strong understanding of system design principles and modern engineering tooling (preferred).
What We Do
At NewDay, our business is focused on a single, clear and defining purpose: to help people move forward with credit. We provide nearly 4 million customers with responsible access to credit, underpinned by best-in-class customer service and exceptional user experience. Our in-house, highly scalable digital platform alongside our proprietary credit decisioning capability unlocks our competitive advantage. Our broad credit product offering enables instalment finance, BNPL, 0% finance and carded and digital revolving credit. We operate multiple direct-to-consumer products and a range of credit solutions with some of the UK’s most loved brands. Our underwriting capability and experience allow us to responsibly say yes to more UK customers making us a merchant partner of choice. We partner to harness the power of data to drive commerce across the UK, creating value at scale.
