Senior Full Stack Developer
Confirmed on the employer's own hiring board on Oct 12, 2026. First seen by Alion on Sep 9, 2026.
Job Role: Senior Full Stack Developer
Job Type: Permanent
Base Office: London
Working Structure: Hybrid
About Us
We are a growing digital team working with a wide range of clients to build, scale and maintain robust, high-quality web applications.
Our culture is collaborative, innovative and focused on delivering solutions that make a real impact. We work together to solve complex technical challenges, continuously improve how we work and build software that we can be proud of.
We are looking for a Senior Full Stack Developer to join our team and play a key role in designing, delivering and maintaining modern, scalable and maintainable web applications for a range of clients.
What You’ll Be Doing
In this role, you will:
Take a leading role in the design, development and delivery of high-quality web applications for a range of clients.
Work closely with developers, testers, designers, project managers and client stakeholders to deliver robust and effective technical solutions.
Provide technical leadership within project teams, helping to make sound technical decisions and ensuring solutions are scalable, secure and maintainable.
Write clean, well-structured and maintainable code, setting a strong example for development best practices and coding standards.
Contribute to application architecture and technical design, working with the wider team to make appropriate technology and implementation decisions.
Lead and contribute to code reviews, helping to maintain quality and supporting the development of other team members.
Mentor and support less experienced developers, helping them develop their technical skills, confidence and problem-solving abilities.
Advocate for automated testing and work closely with QA and developers to improve and extend automated test coverage.
Investigate complex technical issues and take ownership of identifying and delivering effective solutions.
Provide technical input into project planning, including estimations, identifying risks and dependencies, and breaking down complex work into clear, actionable tasks.
Participate in client meetings, clearly communicating technical approaches, progress, risks and potential blockers.
Help establish and continuously improve development standards, processes and best practices across the team.
Use AI-assisted development tools to improve productivity and support activities such as coding, debugging, testing, documentation and technical research.
Help establish good practices for the responsible use of AI-assisted development, ensuring AI-generated outputs are understood, reviewed, tested and meet appropriate standards for security, quality and maintainability.
Stay up to date with emerging technologies and approaches, including developments in AI-assisted software engineering, and identify opportunities where they could provide value.
What We’re Looking For
Required Skills & Experience:
Take a leading role in the design, development and delivery of high-quality web applications for a range of clients.
Work closely with developers, testers, designers, project managers and client stakeholders to deliver robust and effective technical solutions.
Provide technical leadership within project teams, helping to make sound technical decisions and ensuring solutions are scalable, secure and maintainable.
Write clean, well-structured and maintainable code, setting a strong example for development best practices and coding standards.
Contribute to application architecture and technical design, working with the wider team to make appropriate technology and implementation decisions.
Lead and contribute to code reviews, helping to maintain quality and supporting the development of other team members.
Mentor and support less experienced developers, helping them develop their technical skills, confidence and problem-solving abilities.
Advocate for automated testing and work closely with QA and developers to improve and extend automated test coverage.
Investigate complex technical issues and take ownership of identifying and delivering effective solutions.
Provide technical input into project planning, including estimations, identifying risks and dependencies, and breaking down complex work into clear, actionable tasks.
Participate in client meetings, clearly communicating technical approaches, progress, risks and potential blockers.
Help establish and continuously improve development standards, processes and best practices across the team.
Use AI-assisted development tools to improve productivity and support activities such as coding, debugging, testing, documentation and technical research.
Help establish good practices for the responsible use of AI-assisted development, ensuring AI-generated outputs are understood, reviewed, tested and meet appropriate standards for security, quality and maintainability.
Stay up to date with emerging technologies and approaches, including developments in AI-assisted software engineering, and identify opportunities where they could provide value.
Nice to Have:
Strong experience with Docker and containerised development environments.
Experience designing and working with cloud infrastructure on platforms such as AWS, Azure or similar.
Experience designing and developing RESTful APIs and integrating with third-party services.
Experience with application performance optimisation, including database optimisation, caching and improving application performance.
Experience contributing to or defining application architecture and technical standards.
Experience implementing or improving automated testing strategies.
Experience evaluating and introducing developer tools, including AI-assisted development tools, into engineering teams.
Experience with React Native or other mobile application development frameworks.
Equal Opportunities:
CACI is proud to be an equal opportunities employer. Embracing the diversity of our people, we are on a journey to build a truly inclusive work environment where no one is treated less favourably due to ethnic origin, age, sex, gender identity, veteran status, religion or belief, sexual orientation, marital status, and disability or health condition, actively working to prevent discrimination.
As a Disability Confident employer, we will;
Provide reasonable adjustments in the recruitment process where requested (contact a member of the recruitment team on 020 7602 6000 to discuss individual requirements further).
Offer people with health conditions and disabilities, meeting the minimum criteria for a role, an interview.
Our people are unique and we encourage, and support them, to be confident in contributing to our inclusion journey.