Senior Frontend Developer with React

One of my client is looking for a Senior frontend developer role able to join their offices in London or New Castle (UK). They build world class apps, middleware and digital products in the global lottery, betting, and gaming space. The role is hybrid, 2 days per week at the office is mandatory. Design, build, and maintain high-quality applications across web, mobile, and backend environments depending on project needs. - Identify and reduce technical debt while supporting system modernisation efforts. - Ensure strong performance, scalability, security, and reliability across platforms. - Implement testing, monitoring, and observability best practices. - Strong expertise in front-end technologies (JavaScript/TypeScript frameworks) or another core area such as React - Experience integrating front-end applications with APIs and backend services. - Solid understanding of distributed systems and cloud environments (AWS preferred). - Familiarity with CI/CD pipelines, automated testing, and modern delivery practices. - Experience with performance optimisation, debugging, and observability tools. - Exposure to legacy systems and modernisation projects is advantageous. - Knowledge of secure coding practices and common security standards. -