Job Description
Our client is a growing, mission-led consultancy delivering secure and modern software solutions across the UK Government and Defence sectors. They are now looking for an experienced Principal Full Stack Software Engineer to join their collaborative and forward-thinking engineering team.
This is an exciting opportunity for a senior engineer who enjoys staying hands-on across both back-end and front-end development while also helping shape technical direction, mentoring teams, and driving engineering best practice.
You will work on secure, scalable cloud-native platforms, modern web applications, APIs, and digital services that support meaningful and high-impact programmes.
What Youll Be Doing
* Leading the design, development, and delivery of secure full-stack applications using Java, React, and modern web technologies
* Building scalable back-end services, APIs, and distributed systems
* Developing responsive and user-focused front-end applications using React and associated frameworks
* Designing and maintaining cloud-native solutions across AWS, Azure, and private cloud environments
* Driving DevOps and automation best practices including CI/CD, containers, and infrastructure-as-code
* Supporting and mentoring engineers within agile delivery teams
* Collaborating closely with clients, stakeholders, architects, and multidisciplinary teams to shape technical solutions
* Contributing across the full software development lifecycle, from discovery and architecture through to deployment and production support
* Promoting engineering excellence, clean coding standards, and continuous improvement across teams
What Were Looking For
* Strong commercial experience developing full-stack software applications using Java and modern front-end frameworks such as React
* Previous experience operating at Senior, Lead, or Principal Engineer level
* Strong understanding of software architecture, API design, and scalable distributed systems
* Experience building cloud-native applications and working within AWS, Azure, or similar cloud environments
* Strong knowledge of DevOps tooling, CI/CD pipelines, containers, and automation
* Experience delivering secure, production-grade systems within agile teams
* Excellent communication, stakeholder engagement, and technical leadership skills
* Passion for balancing hands-on engineering with mentoring and leadership responsibilities
Nice to Have
* Experience working within Government, Defence, or National Security environments
* Familiarity with secure or classified programmes
* Knowledge of ITSM or operational support environments
* Experience working within highly regulated or mission-critical sectors
Whats on Offer
* Flexible remote and hybrid working options
* 37.5-hour working week
* Learning & development budget for certifications, conferences, and training
* Private healthcare
* Matched pension scheme
* Monthly socials and quarterly company meetups
* Clear progression opportunities into senior technical and leadership positions
* Opportunity to work on meaningful projects supporting important UK programmes and services
Diversity & Inclusion
Our client is committed to creating an inclusive environment where everyone feels supported, valued, and able to thrive. They welcome applications from individuals of all backgrounds and experiences and are proud to be an equal opportunities employer and Disability Confident organisation.
Interested?
If you are an experienced Principal Full Stack Software Engineer with strong Java and React expertise and are looking for an opportunity to work on impactful technology projects within a collaborative and supportive environment, we would love to hear from you.
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