Senior Software Engineer - .NET

We are looking for an experienced Senior .NET Developer (C#) to join the Acquisitions & Originations engineering team within Experian's Credit & Verification Services business. The Domain The Acquisitions & Originations team develops and provides level 3 support for the Delphi Select and Evaluate platforms, which are used across the Acquisitions and Originations business. These are complex, configuration-driven, multi-client systems: each client (bank, lender or other financial institution) runs its own decisioning strategies, rules and data configurations on a shared codebase. Clients depend on these systems to make real-time lending and origination decisions, so reliability, data integrity and controlled release processes are central to the role. This is a hybrid, Nottingham based role (40% in the office) reporting to the Lead Developer. Key Responsibilities - Own features end-to-end across the full software development lifecycle: requirements analysis, technical design, development, unit and integration testing, code review, deployment and post-release support. - Design, develop and maintain scalable, maintainable C#/.NET services and components within a complex, multi-client system, ensuring changes are safe across all client configurations. - Translate high-level and client-specific requirements into robust technical designs, in collaboration with the Technical Lead, Architects, Business Analysts and Product Owners. - Maintain and improve automated test coverage (unit, integration and regression) to support safe, frequent releases into a live multi-client platform. - Contribute to and help evolve CI/CD pipelines (Git, Jenkins) - Identify and help remediate technical debt, and contribute to ongoing modernisation of the platform, including its migration towards cloud-native (AWS) architecture. - Mentor Intermediate and Junior developers, sharing technical knowledge and supporting their growth, including in the effective use of AI-assisted development tools. Required Skills / Knowledge - Strong expertise in .NET Core / .NET Framework and C#, including object-oriented design and common design patterns. - Proven experience across the full software development lifecycle, ideally supporting a live, business-critical production system. - Solid experience with SQL Server / T-SQL, including writing and optimising queries and stored procedures against production data. - Experience designing and consuming RESTful APIs, and working with service-oriented or microservice architectures. - Practical experience with unit and integration testing frameworks (e.g. xUnit, NUnit or MSTest). - Experience with version control and CI/CD tooling (e.g. Git, Jenkins, or equivalent). - Direct experience working in a Scrum or other Agile team, including sprint planning, stand-ups and retrospectives. - Hands-on, everyday experience using AI-assisted development tools (e.g. GitHub Copilot, Cursor, Claude, ChatGPT) for tasks such as code generation, refactoring, test writing, debugging and documentation Useful Skills (beneficial, not mandatory) - Exposure to AWS services (e.g. DynamoDB, S3, EC2 ) or a strong interest in developing cloud skills as the platform migrates to AWS. - Experience with Infrastructure as Code (e.g. Terraform, CloudFormation). - Knowledge of containerisation (Docker, Kubernetes). - Experience in financial services, lending, credit decisioning or a similarly regulated domain. - Exposure to front-end technologies such as React or modern JavaScript/TypeScript. - Experience working with configuration-driven or rules-engine-based systems.