Senior Software Developer (UK-based) in London

We’re looking for a passionate and experienced Senior Software Developer to join one of our agile squads. In this role, you’ll be hands‑on in designing, building, and enhancing features across the PCI Pal product suite, while also setting the technical standard through mentorship, code reviews, and driving engineering best practices. You’ll collaborate closely with testers, product owners, and team leads to deliver high‑quality, maintainable solutions in a fast‑moving environment. With responsibilities spanning feature development, infrastructure support, and continuous learning, this is an opportunity to shape both the product and the team around you through expert‑level contribution and thoughtful technical leadership.

The successful candidate must be within commuting distance to both London and Ipswich. This is a hybrid role with expectation that when required, the successful candidate can travel to one of our offices at least once per week.

Job requirements

• Strong experience in modern C#, TypeScript, HTML and CSS
• Strong cloud platform experience, ideally AWS
• Strong CI/CD experience
• Strong experience of using infrastructure as code (e.g., CDK, Terraform)
• Experience developing serverless applications (e.g., Lambda)
• A strong focus on architecture and code quality
• Experience of modern UI frameworks such as Vue or React
• Have a good understanding of SOLID principles and how to use design patterns to create robust, maintainable and testable code
• Strong understanding of object‑oriented programming and Dependency Injection
• Strong experience of integrating with third‑party services using APIs
• Experience writing performance critical code
• Experience using Git or a similar tool to track changes
• Experience with both the full .NET Framework and .NET Core
• Experience using observability systems such as Elastic APM or DataDog to track and diagnose issues in production
• A solid understanding of security principles and secure coding including OWASP Top 10

Nice to haves:

• Experience in VOIP (SIP and RTP advantageous)
• Experience of TDD/BDD/DDD
• Knowledge of PCI compliance and associated standards such as ISO 27001
• Knowledge of accessibility standards and how to apply them (WCAG)
• Experience with developing CRM plugins
• Experience of Python and Data Analytics
• Experience of developing AI applications

Working as part of a close‑knit squad of developers and testers to design, build and deliver high‑quality solutions in line with guidance and best practices of the department. Providing technical guidance and mentorship to other members of your team. Drive best practices – SOLID principles, design patterns and refactoring existing code to be more maintainable and efficient. Writing code to develop, fix or enhance features within the PCI Pal product suite. Working with your team lead and product owner to plan and refine projects. Helping to ensure the team delivers high‑quality features on time in a rapidly changing environment. Supporting the management of web infrastructure and performing associated health checks as needed. Building and maintaining an expert knowledge of PCI Pal’s products, services, and deployment methodology. Creating internal technical and process documentation for your work to ensure knowledge is shared with the wider engineering team. Maintain high standards of software quality within the team by establishing good practices and habits. Writing testable, scalable and efficient code and leading code reviews. Supporting live products. Learning new technologies and keep abreast of existing technologies and be able to apply these to your work.

What we offer

• 25 days holiday, rising to 28 days per annum with length of service
• Medical, dental and optical insurance cover
• An exciting and flexible working environment surrounded by friendly and committed co‑workers
• Electric Vehicle Scheme incentive
• 'Work from anywhere' 2 weeks per year policy
• Reward, benefits and wellbeing hub (offering support, discounts, cashback and savings)
• Training and development opportunities
• Ad‑hoc team events, incentives and competitions