Contract Software Engineer / Lead Developer - TypeScript Expert The Role We're looking for an exceptional Software Engineer / Back-End Developer - a true 'super dev' - with proven TypeScript expertise and a deep understanding of software engineering patterns. This is a high-level contract role, suitable for someone operating at Principal Engineer or Lead Engineer level. You'll join a small, highly skilled team building a new platform driven by innovative algorithms, clever data structures, and pattern-based architecture. Working closely with the Head of Architecture, you'll take abstract concepts and requirements, distil them, and deliver high-quality, elegant solutions. This is a role for someone who thrives on independence, can work from a high-level brief, and produces results quickly and to the highest standards. Location: Hybrid - 2 days per week in Yorkshire, possibly less remainder remote Rate: circa £680 per day (inside IR35) Duration: 6 months initially Start: Beginning of September Key Responsibilities Lead the back-end development of a new platform using TypeScript. Apply advanced software engineering patterns and design principles. Translate abstract concepts into working, production-ready solutions. Employ Test-Driven Development (TDD) and SOLID principles. Build robust, scalable algorithms and efficient data structures. Collaborate with other engineers, mentoring and sharing knowledge. Produce maintainable, clean code based on the 'less is more' principle. Essential Skills & Experience Expert in TypeScript, with strong back-end development experience. Extensive experience in applying well-known software patterns. Proven ability to work independently with minimal guidance. Advanced algorithmic approach and abstract problem-solving capabilities. Solid understanding of TDD and SOLID principles. Minimum 5 years' experience in software development/software engineering Excellent technical communication skills. Able to take a concept from discussion to high-quality code delivery. Desirable Degree in Computer Science, Software Engineering, or related discipline highly desirable Experience in high-performance or complex systems. Familiarity with algorithmic analysis and performance optimisation. Work Arrangements Hybrid: 2 days per week in Sheffield office. Flexibility possible for the right candidate. Inside IR35 contract. If you are a high-calibre developer with the skills above and the ability to deliver complex back-end solutions at speed, we'd love to hear from you.