Salary: £33,000 - 73,000 per year Requirements: We require advanced experience with C# and .NET, including .NET Framework and .NET Core. We require frontend development experience with TypeScript, HTML, CSS, and either React or Vue. We require proven experience with AWS, ideally including serverless architectures such as Lambda. We require experience with CI/CD pipelines and Infrastructure as Code, such as Terraform or CDK. We require a strong grounding in clean architecture, SOLID principles, and code maintainability. We require knowledge of API integration and secure development practices, including OWASP. We prefer experience with TDD or BDD methodologies. We prefer familiarity with PCI or ISO standards. We prefer exposure to VoIP technologies. We prefer knowledge of Python or AI-related development. Responsibilities: We design, build, and improve scalable cloud-native applications. We deliver end-to-end software solutions in a modern technology stack. We work closely with product managers, QA, and engineering leadership. We shape system architecture and influence engineering practices. We conduct code reviews and provide mentorship to developers. We maintain and enhance live systems with a focus on continuous improvement. We contribute directly to product evolution and support agile delivery goals. We promote high standards across the development lifecycle. Technologies: .NET Framework AI API AWS Lambda C# CI/CD Cloud CSS Frontend Support OWASP Python React Serverless TDD Terraform TypeScript Vue ASP.NET DevOps More: We are a rapidly expanding SaaS company offering an initial 3-month contract for a Senior Software Engineer. This is an outside IR35 engagement with a day rate of up to £475, and we work in a hybrid model based around London and Ipswich, with occasional travel to either location approximately once per month. You will join a high-performing agile delivery team and have the opportunity to make a strong impact on our system architecture, engineering practices, and product direction while helping us build robust, secure, and scalable SaaS solutions. last updated 24 week of 2026