Senior Platform Engineer

CACI Ltd; City Of London; On-site; GBP 60,000 - 80,000; Full time

Job summary

A leading technology consultancy in London is seeking an experienced AWS Platform Engineer to lead architecture decisions for cloud solutions. You will collaborate with expert engineers, drive innovations, and deliver secure cloud platforms for critical national infrastructure. The ideal candidate has hands-on experience with AWS cloud infrastructure and must be a British passport holder for security clearance.

Benefits

25 days holiday + bank holidays

Up to 5% employer pension contribution

Educational allowance

Flexible Working Arrangements

Qualifications

• Hands-on experience designing and managing AWS cloud infrastructure.
• Deep expertise in multi-tenanted platform architectures and multi-account AWS setups.
• Expert-level knowledge of AWS Networking, TLS, and security best practices.

Responsibilities

• Lead the architecture and evolution of AWS platforms at scale.
• Develop and maintain Infrastructure as Code solutions.
• Champion security, compliance, and observability.

Skills

AWS cloud infrastructure design

Multi-tenanted platform architectures

Python programming

Go programming

Container orchestration

Security best practices

Problem-solving

Tools

Terraform

CloudFormation

AWS CDK

Kubernetes

Grafana

ELK

Job description

About CACI

Headquartered in London, CACI Ltd is a wholly owned subsidiary of CACI International Inc., a publicly listed company on the NYSE with annual revenue in excess of US $6.2bn and employing approx. 22,000 people worldwide.

CACI Ltd is an international data and technology consultancy with £154m turnover and 1200 employees. We are passionate, progressive and unafraid of challenge; our mission is to use technology and data-driven insight to make a commercial difference.

We provide expert advice and hands-on system management to help our national and global clients get the most from technology and data. We use innovation wisely to deliver well thought-out digital solutions and software.

CAC I G's Information Intelligence Group provides a range of software, Consultancy and managed services to clients. With experience and understanding of systems integration, analytics and secure cloud and managed services, we help clients improve operational processes, gain greater insight into their business and reduce costs.

From data integration, web reporting and activity-based costing to mobile working, telecom operational support systems and online transactional solutions, we help our clients to understand their business, manage performance and deliver value for money services to their customers.

Founded in 2006, the CACI IIG is an agile, exciting, growing and progressive business unit within CACI UK. We currently have over 400 intelligent, professional and engaging staff. Through a rigorous emphasis on quality, the company has grown considerably to become one of the UK's most well-respected Software Engineering Companies.

IIG's company mission statement is to delight our customers and employees by delivering core mission solutions that keep the UK safe, secure and sustainably moving forward.

Our strategy is to do great things for our customers on work that is at the heart of their core mission. We bring together highly capable, creative, curious and passionate problem solvers to:

• Seek excellence, delivering real customer value in an open, honest and friendly way

• Run and grow a sustainable and profitable business

• Work alongside our customers to exceed their expectations and set the standard for our competitors- Be the trusted technical partner of choice in our chosen markets

• Provide employees with a great working environment focussed on support, growth and empowerment

Our mission is to support government departments to use information intelligently to make mission critical decisions and advance the security, sustainability and prosperity for the UK.

Job Summary

At IdentityE2E (a CACI business), we're redefining what's possible in AWS platform engineering. As the first UK company to achieve AWS Vetted Partner Program (VPP) status for National Security and Defence, we design cutting-edge solutions for complex, highly regulated environments at large scale. Our Jezero Secure Landing Zone Accelerator and Cydonia biometric cloud solutions set industry benchmarks for scalability, security, and innovation.

We're looking for an experienced AWS Platform Engineer who's ready to lead architecture decisions, experiment boldly, and push boundaries in delivering secure, scalable, and dynamic cloud platforms. You'll collaborate with expert level engineers, have opportunities to work in collaboration with AWS, and to influence the next generation of cloud services while working on critical national infrastructure and large-scale projects.

Due to the industries we work in, we require all our team to be able to obtain security clearance. To qualify for this, you must be a British passport holder and have lived permanently in the UK for the last 5 years.

Key Responsibilities

• Lead the architecture and evolution of AWS platforms at scale, leveraging AWS Organizations, Landing Zones, and multi-account best practices.
• Develop and maintain Infrastructure as Code solutions using Terraform, CloudFormation, and AWS CDK.
• Champion security, compliance, and observability by integrating services like AWS Security Hub, GuardDuty, and Inspector.
• Design CI/CD pipelines to enable seamless deployments and self-service models for customers.
• Innovate with AWS Networking, KMS, IAM, and container orchestration (Kubernetes, ECS).
• Mentor and collaborate with a team of talented engineers, fostering a culture of technical excellence.

Skills, Knowledge and Expertise

• Hands-on experience designing and managing AWS cloud infrastructure.
• Deep expertise in multi-tenanted platform architectures and multi-account AWS setups.
• Proficiency in Python, Go, or similar languages for automation and scripting.
• Expert-level knowledge of AWS Networking, TLS, and security best practices.
• Experience with container orchestration (Kubernetes, EKS) and observability tools (Grafana, ELK).
• A passion for innovation, problem-solving, and delivering high-impact solutions.

Why Work For Us?

• 25 days holiday + bank holidays
• Up to 5% employer pension contribution
• Educational allowance, training programmes, certifications, conference attendance, and other activities to help employees stay current with new technologies and industry trends.
• Flexible Working Arrangements

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.

• 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.

We are committed to creating a diverse environment and are proud to be an equal-opportunity employer. All qualified applicants will receive consideration for employment without regard to race, colour, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status.

Successful candidates must have the right to work in the UK.