Salary: £45,000 - 70,000 per year Requirements: 5 years of backend development experience Strong Visual Basic .NET and C# skills for API development and business logic implementation Expertise in SQL Server, including query optimization, indexing, and stored procedures Proficiency in RESTful API development, with a strong understanding of error handling, logging, and monitoring Good understanding of Windows Forms Experience with Git, version control workflows, and agile development methodologies Experience setting up and managing Azure DevOps pipelines for CI/CD automation (recommended) Familiarity with Swagger for API documentation (recommended) SAP Business One or similar accounting system experience (preferred) Responsibilities: Build and maintain RESTful APIs in VB.NET and C#, integrating with SQL Server and SAP Business One backend tables Write optimized SQL queries, stored procedures, and indexing strategies to efficiently handle large datasets Monitor and enhance API performance, database query execution, and application scalability Maintain clear and detailed documentation for APIs, database structures, and all the back-end infrastructure Work closely with SAP consultants, frontend developers, and DevOps engineers to ensure seamless system integration Conduct code reviews, debugging, and error handling to maintain system reliability Stay up to date with API design standards, database performance tuning, and cloud integration trends Technologies: API Azure Backend C# CI/CD Cloud DevOps Frontend Git SAP SQL Swagger Visual Basic Windows Windows Forms ASP.NET Security Web More: We are an established financial software house based in North London, working with some of the leading brands in retail and media. Our small dynamic team of tech professionals is dedicated to developing in-house financial management systems. We are currently seeking a Senior Developer to join our team, offering a competitive salary of up to £70K. This role is fully office-based, allowing for collaborative work and consistent engagement with our team. last updated 9 week of 2026