Full Stack Developer (React) | London | Contract

Contract Role: Full Stack Developer (React) Contract Location: London 4-5 days onsite each week Contract Start: Starting ASAP (inside IR35) Contract duration: End of 2026 Payroll provider: Rockford Payroll Info for Contingent Workers – Rockford Pay Deloitte are seeking a highly skilled Full Stack Developer to join our team and contribute to the design, development, and delivery of scalable, high-performance applications. The ideal candidate has strong expertise in both front-end and back-end technologies, experience with cloud platforms, and the ability to collaborate effectively across teams while supporting technical delivery. Key Responsibilities: Technical Delivery Design, develop, and maintain full-stack applications using modern frameworks and technologies. Build scalable APIs, microservices, and integrations. Develop high-quality, responsive UI components with an eye for performance and usability. Optimize system performance, reliability, and scalability. Architecture & Design Contribute to application architecture decisions and long-term technology strategy. Create technical designs, sequence diagrams, and solution documentation. Implement coding standards, best practices, and reusable components. Cloud & DevOps Utilize CI/CD pipelines for end-to-end automation. Work with cloud platforms (e.g., Azure/AWS/GCP) for application hosting and deployments. Manage application monitoring, logging, and performance tuning. Collaboration & Leadership Work closely with Product Owners, Designers, and cross-functional teams to deliver features. Perform code reviews and provide technical guidance to junior developers as needed. Participate in sprint planning, grooming, estimation, and Agile ceremonies. Required Skills & Experience Technical Expertise Strong proficiency in front-end technologies: React / Angular / Vue HTML5, CSS3, JavaScript/TypeScript Solid experience in back-end technologies: Node.js / .NET / Java / Python REST APIs, GraphQL Strong understanding of databases: SQL (PostgreSQL, MySQL, SQL Server) NoSQL (MongoDB, Cosmos DB, DynamoDB) Hands-on experience with cloud services, ideally Azure or AWS. Experience with CI/CD pipelines (GitHub Actions, Azure DevOps, Jenkins, etc.). Containerization & orchestration (Docker, Kubernetes) is a plus. Soft Skills Strong problem-solving abilities and analytical thinking. Excellent communication and stakeholder engagement skills. Ability to work independently and support technical initiatives. Experience working in Agile/Scrum teams. Preferred Experience Significant professional full-stack development experience. Experience with microservices, event-driven architectures, or serverless technologies. Exposure to security practices, OAuth2, SSO, and secure coding principles. Prior experience mentoring teams or supporting development streams.