Senior Software Developer (Contract)6 Months Outside IR35 Up to 475/day Hybrid (London / Ipswich)We''re working with a fast-growing SaaS business looking for a Senior Software Developer to join their agile team on an initial 6-month contract. This is a hands-on role with real influence across architecture, engineering standards, and product delivery.You''ll be building and enhancing scalable, cloud-based applications while mentoring others and driving best practices across the team.Key skills:Strong C# / .NET (Framework and Core)TypeScript, HTML, CSS + React or VueSolid AWS experience (serverless/Lambda ideal)CI/CD pipelines and Infrastructure as Code (Terraform/CDK)Strong focus on clean architecture, SOLID principles and code qualityAPI integrations and secure coding (OWASP)The role:Full lifecycle development in a modern tech environmentCollaborating with product, QA, and engineering leadsCode reviews, mentorship, and technical leadershipSupporting live systems and continuous improvementNice to have: TDD/BDD, PCI/ISO knowledge, VoIP, Python/AI exposureHybrid working with occasional travel to London or Ipswich (roughly once per month).Great opportunity to join a high-performing team delivering secure, scalable SaaS products.