Senior Developer

Are you a software developer looking for a new opportunity? Now is a fantastic time to start building your career in our exciting, creative and world-class IT team. If you want to learn a lot, help others do the same and be part of delivering public service that makes a real difference, HMRC is a great place to do that. The Senior Software Developer role sits within HMRC’s Chief Digital Product Office (CDPO), in the Business Developed Applications (BDApp) team. This team designs, builds and maintains software solutions that support HMRC’s customer-focused strategy with a portfolio that includes around 140 products, ranging from new applications to legacy systems. The role is central to delivering technological change while ensuring operational stability. It involves leading the design and delivery of BDApps, maintaining and enhancing existing applications, and driving improvements to reduce technical debt and ensure compliance with legislation and HMRC standards. Key responsibilities include Leading the design and development of software products within the BDApp portfolio Ensuring operational stability and performance of existing applications Implementing changes to maintain compliance and improve efficiency Working with stakeholders to deliver secure, effective and sustainable solutions Supporting HMRC’s strategic direction by adopting cloud technologies and modern development practices This position requires a strong understanding of the software development lifecycle and HMRC’s IT infrastructure. It also involves applying knowledge of cloud platforms and enterprise architecture to deliver solutions that meet our organisational goals. The role combines technical leadership with hands‑on development and collaboration across teams Job description This is a challenging role for those looking to deliver technological change during a period of organisational transformation. It offers the opportunity to make a real difference to people’s lives by delivering high-quality digital products. As a Senior Developer, you will take responsibility for the operational stability of our portfolio of Business Developed Applications (BDApp) and ensure changes are implemented with ongoing robustness and reliability Role overview Own the full Software Development Life Cycle, applying agreed software and architectural design principles to deliver fit‑for‑purpose solutions. Lead and engage with stakeholders throughout all stages of development, from feasibility to delivery, ensuring customer needs and timescales are met. Write high‑level software that complies with HMRC and WCAG standards, with a strong focus on accessibility and security. Support the transition to web‑based and microservice architectures, considering evolving technologies to protect customer data. Apply knowledge of technical innovations and HMRC’s technology landscape to shape developments, leveraging corporate robotics, BDApp capabilities and low‑code solutions such as Power Platform Additional responsibilities Work closely with delivery managers and support teams to ensure products meet HMRC and Government governance requirements. Mentor team members and invest in continuous learning to stay ahead of technology changes. Maintain an organised approach to managing tasks for yourself and others. Person specification As a Senior Software Developer, your daily responsibilities may Include : Developing software using C# or other high‑level programming languages. Leading the technical direction of the team, mentoring junior developers and investing in your own learning. Driving adoption of modern technologies, including cloud services, microservices, robotics, and low / no‑code solutions to enhance BDApp products. Leading projects through the full software development lifecycle, providing progress updates to stakeholders via demonstrations and documentation. Designing and writing detailed test scripts, supporting technical testing and User Acceptance Testing with business stakeholders. Producing clear technical documentation and accessible system navigation guides, and supporting the creation of help tools. Reviewing software to ensure compliance with security standards and design principles, highlighting any deviations or risks. Collaborating with colleagues across CDIO to deliver bespoke tools and support wider digital initiatives. Working with the support team to create knowledge articles, resolve complex issues, and take ownership of cases escalated beyond first‑line support Preparing for and attending stakeholder and team meetings, which may involve occasional travel and overnight stays. Supporting team organisation and delivery without current line management responsibilities (subject to change under the operating model). Essential Criteria Significant experience developing in a high‑level programming language (such as C# or Java), including WPF, HTML, CSS and .NET technologies. Knowledge of low‑code solutions is desirable. Strong understanding of SOLID principles, test‑driven development and design patterns such as MVVM and MVC. Experience with Entity Framework or other ORM tools, SQL or NoSQL databases, and relational database architecture including integrity constraints. Good knowledge of web technologies and protocols, including microservice architecture, APIs and containerised solutions. Awareness of software accessibility challenges and how to address them. Ability to communicate system changes, issues and risks effectively to project leads and stakeholders. Proven ability to work independently and as part of a team, demonstrating excellent organisational and interpersonal skills. Experience of sharing knowledge and best practice, and critically evaluating own and others’ work to successfully implement software development best practises. Desirable Criteria Experience of mentoring and technically leading a team in an Agile environments. In‑depth knowledge of exploiting an AWS Platform. Additional Security Information Security Check (SC) clearance or willingness to obtain the clearance for appointment. #J-18808-Ljbffr