Senior Frontend Developer

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.

Important:

The role is hybrid, 1 day per week at the office is mandatory.

Main Responsibilities:

- Design, build, and maintain high-quality applications across web, mobile, and backend environments depending on project needs.

- Take ownership of technical design and delivery for medium to high complexity features and systems.

- Translate complex requirements into scalable, maintainable solutions.

- Act as a subject matter expert in a primary discipline while contributing across other parts of the stack when needed.

- Collaborate closely with cross-functional teams including product, QA, and design.

- Drive improvements in engineering standards, tools, and processes.

- Identify and reduce technical debt while supporting system modernisation efforts.

- Ensure strong performance, scalability, security, and reliability across platforms.

- Lead or contribute to technical initiatives spanning multiple systems.

- Mentor team members and support knowledge sharing and hiring activities.

- Implement testing, monitoring, and observability best practices.

- Contribute to secure development practices and compliance requirements where applicable.

Desired experience:

- Proven experience in a senior engineering role with ownership of complex systems.

- Strong expertise in front-end technologies (JavaScript/TypeScript frameworks) or another core area such as React

- Ability to work beyond a single specialization (T-shaped skillset) — preferred but not strictly mandatory.

- 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.

- Experience mentoring engineers or influencing technical decisions is beneficial but not mandatory.