Full Stack Developer

CBSbutler Holdings Limited trading as CBSbutler; City of Westminster; On-site; GBP 92,000 - 100,000; Full time

Job summary

CBSbutler Holdings Limited trading as CBSbutler is seeking a seasoned secure full stack developer to design, build and maintain applications using Java, Spring Boot, React and TypeScript for a Defence/National Security programme.

You will deliver scalable backend services, secure RESTful APIs and responsive frontend components, with data persistence across SQL/NoSQL stores. Onsite London work four days per week, DV clearance required, IR35 status outside UK regulations.

Qualifications

• Proven full stack development experience within MOD, Defence, National Security or similarly secure environments.
• Strong Java development experience.
• Strong Spring Boot experience.
• Strong React and TypeScript development experience.
• Experience designing and developing RESTful APIs.
• Experience with SQL and/or NoSQL databases.
• Experience building accessible and maintainable UI.
• Experience with CI/CD pipelines and DevSecOps practices.
• Current DV Security Clearance.
• Ability to work onsite at an MOD location in London four days per week.
• Previous experience delivering within MOD, Defence Intelligence, Strategic Command or wider National Security organisations.
• Comfortable working with OFFICIAL-SENSITIVE and classified material where authorised.

Responsibilities

• Design, develop and maintain secure full stack applications using Java, Spring Boot, React and TypeScript.
• Develop scalable backend services and secure RESTful APIs.
• Build intuitive, accessible and responsive frontend applications.
• Develop reusable frontend components aligned with established design system principles.
• Integrate frontend applications with backend APIs, workflow services and identity/access mechanisms.
• Design and implement data persistence using SQL and NoSQL technologies.
• Develop integrations with enterprise data sources and existing Defence systems.
• Contribute to cloud-native deployment, containerisation and CI/CD pipelines.
• Implement secure coding practices, logging, monitoring and audit capabilities.
• Write automated tests across frontend and backend components.
• Participate in technical design workshops, code reviews and agile ceremonies.
• Work closely with UX Designers, Product, Engineering and Defence stakeholders.
• Support continuous improvement of application performance, usability, reliability and security.

Skills

Full stack development

Java

Spring Boot

React

TypeScript

RESTful APIs

SQL

NoSQL

Docker

Kubernetes

Git

DevSecOps

CI/CD

DV Security Clearance

Tools

Docker

Kubernetes

Git

AWS

OpenSearch

ElasticSearch

Camunda

BPMN

Figma

Istio

MongoDB

Job description

Salary: £? - ? per year

Requirements

• Proven full stack development experience within MOD, Defence, National Security or similarly secure environments.
• Strong Java development experience.
• Strong Spring Boot experience.
• Strong React and TypeScript development experience.
• Experience designing and developing RESTful APIs.
• Experience with SQL and/or NoSQL databases.
• Experience building responsive, accessible and maintainable user interfaces.
• Experience with Git and modern software development practices.
• Experience with Docker, Kubernetes or other container technologies.
• Familiarity with CI/CD pipelines and DevSecOps practices.
• Experience working within agile, multidisciplinary delivery teams.
• Strong understanding of secure software development and scalable application architecture.
• Current DV Security Clearance.
• Ability to work onsite at an MOD location in London four days per week.
• Previous experience delivering within MOD, Defence, Defence Intelligence, Strategic Command or wider National Security organisations.
• Comfortable working with OFFICIAL-SENSITIVE and classified material where authorised.

Responsibilities

• Design, develop and maintain secure full stack applications using Java, Spring Boot, React and TypeScript.
• Develop scalable backend services and secure RESTful APIs.
• Build intuitive, accessible and responsive frontend applications.
• Develop reusable frontend components aligned with established design system principles.
• Integrate frontend applications with backend APIs, workflow services and identity/access mechanisms.
• Design and implement data persistence using SQL and NoSQL technologies.
• Develop integrations with enterprise data sources and existing Defence systems.
• Contribute to cloud-native deployment, containerisation and CI/CD pipelines.
• Implement secure coding practices, logging, monitoring and audit capabilities.
• Write automated tests across frontend and backend components.
• Participate in technical design workshops, code reviews and agile ceremonies.
• Work closely with UX Designers, Product, Engineering and Defence stakeholders.
• Support continuous improvement of application performance, usability, reliability and security.

Technologies

• Backend
• CI/CD
• Cloud
• DevSecOps
• Docker
• Frontend
• Git
• Support
• Java
• Kubernetes
• NoSQL
• React
• SQL
• Security
• Spring
• Spring Boot
• TypeScript
• UX UI Design
• AWS
• OpenSearch
• BPMN
• Camunda
• ElasticSearch
• Figma
• Istio
• MongoDB
• Fullstack

More

We are delivering secure, modern digital capabilities within a Defence environment. Our programme is building a next-generation Defence Intelligence capability designed to improve visibility of operational information, streamline workflows, reduce administrative burden and support faster, more informed decision-making. You will work on a secure, cloud-native development environment using modern frontend technologies, secure backend services and integration with existing Defence systems. This role is based in London at an MOD site, with four days per week onsite, and is offered outside IR35 at £500-£540 per day.

last updated 36 week of 2026