Senior Software Engineer (National Security)

About Us:

At CACI Information Intelligence Group (IIG), we're trusted to solve some of the UK's most complex and mission-critical technology challenges.

As a specialist software consultancy, we design and deliver bespoke digital solutions that support National Security, Defence and Government organisations in making critical decisions and responding to evolving threats. Our teams build cutting-edge systems that have a genuine impact, helping protect the UK's people, infrastructure and national interests.

The Opportunity:

As aSenior Software Engineer, you'll join one of our high-performing Agile delivery teams, working directly with customers to build innovative software solutions that solve real-world operational challenges. You'll be involved throughout the entire software lifecycle, from shaping requirements and architecture through to development, deployment and long-term support. This role offers significant variety, technical depth and the opportunity to work across multiple domains, technologies and delivery environments. This will include:

• Designing, developing and testing robust, scalable software solutions.
• Working closely with customers, product owners and technical teams to solve complex business problems.
• Building secure, resilient systems using modern engineering best practices.
• Developing cloud-native applications and services across AWS and Azure.
• Creating and maintaining CI/CD pipelines using tools such as GitLab.
• Contributing to software architecture and technical design decisions.
• Supporting deployments across public and private cloud environments.
• Championing engineering excellence through code reviews, mentoring and knowledge sharing.
• Influencing technical strategy and helping shape the future direction of projects.
• Depending on experience, leading engineering teams and managing customer engagement.

The Fit:

We're growing and are looking for talented Senior Software Engineers to join our National Security business, helping us deliver innovative solutions to some of the most important challenges facing the country today. This is an opportunity to work on projects where the technology is fascinating, the problems are complex, and the outcomes truly matter.

At present we are interested in speaking to Senior Engineers with hands on Back End or Full Stack experience. You will have commercial experience using a range of languages / technologies including Java, Python, AWS, Azure, JavaScript, React or Typescript. Previous consultancy experience is useful but not essential.

We are looking for someone that ideally holds hold high level security clearance, able to support customers from locations in Bristol, Cheltenham and Manchester. Due to the nature of the sector this is supporting, there will be a 4 to 5 day per week in office requirement.

Culture & Benefits:

We take great pride in taking care of our talent, providing a highly dynamic, inclusive and team-led environment where everyone can thrive. We value every member of our business, and strive to be a place you’re excited to work. Our market-leading package of benefits reflects this.

• WELLBEING - Free 24/7 counselling helpline and employee assistance programme
• WORK YOUR BEST - City-centre offices across the UK, combined with flexitime and at home working
• LEARN & GROW - Assigned Career Coach to holistically guide development
• SOCIAL - Get-togethers throughout the year, from ad hoc socials to the Summer Party in London and annual awaydays
• ONSITE ALLOWANCES - expenses for lunch and drinks

Why Join CACI IIG?

Technology is at the heart of everything we do, but our success comes from our people. With over 600 consultants, engineers, architects, data specialists and delivery experts, we bring together exceptional talent to solve problems that most organisations never encounter. We foster a culture that combines technical excellence, innovation and collaboration, giving our teams the freedom to make a real difference.

Whether you're developing cloud-native applications, designing scalable architectures or helping shape critical national capabilities, you'll be trusted to contribute, innovate and grow.

At IIG, you'll find:

• Meaningful work that directly supports UK national security
• A highly collaborative engineering culture
• Modern technology stacks and cloud-native development practices
• The opportunity to influence technical direction and customer outcomes
• Continuous learning and clear career progression
• A business that combines the agility of a specialist consultancy with the scale and stability of a global organisation

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 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.