Senior Platform Engineer

Work on Technology That Protects What Matters

At SiXworks, we build secure digital solutions that support Defence and National Security missions. Our teams work on complex problems where reliability, security, and speed of innovation matter.

We’re looking for a  Senior Platform Engineer who enjoys solving difficult technical challenges and wants their work to have real operational impact.

Working location will be Cheltenham. Hybrid working available.

What You’ll Do

As a Senior Platform Engineer, you'll showcase your expertise by driving technical direction, setting the technical strategy for deploying new solutions in challenging environments and enhancing existing platforms. You embrace the "MVP" approach, designing & building incrementally and learning quickly from failures. You love tinkering and discovering innovative solutions. You're comfortable setting technical direction, eliciting ideas from both your team and our customers, and confident managing and supporting production systems, balancing reliability, performance, and operational excellence in live environments.

We believe in using the right tools and technologies to deliver the best outcomes for our customers. While expertise in every tool isn't required, we value experience with similar technologies and an understanding of the problems they solve. Knowledge of GitHub and GitHub Actions, Terraform, Kubernetes, Bash would be desirable, along with all of your known DevOps technologies and tools, coupled with experience working within a variety of Cloud based platforms.
 

You'll join a small, high-performing team that supports you from day one and throughout your journey with us. The challenges you'll tackle are unique, whether due to security needs or location constraints, offering you a chance to make a significant impact.   

We are committed to your professional growth, offering continuous learning opportunities, mentorship, and the chance to work with cutting-edge technologies. Your development is our priority, and we provide the time and support you need to thrive and advance in your career.  

What We’re Looking For

We value people who take ownership, think critically, and enjoy working as part of a collaborative team tackling complex challenges. You don’t need to tick every box, but you should apply if: 

• You care about customer outcomes, and you want to know and understand who we work with.   

• You love finding new ways to solve problems.   

• You’re comfortable working in a team that deals with ambiguity.   
• You have experience operating production environments supporting live users.

Just as important are curiosity, strong problem solving ability, and the motivation to continuously improve how technology is designed and delivered.

About SiXworks

SiXworks is a specialist digital innovation partner delivering secure, mission-critical technology to Defence and National Security organisations. We focus on digital experimentation, secure-by-design architecture, cloud technologies, and rapid application development to help our customers move faster and stay ahead of evolving challenges.

Our team combines expertise from across technology, business, and operational backgrounds including the armed forces creating a collaborative environment where practical thinking and innovation thrive.

Why Join Us

Our culture is guided by six principles: Agility, Security, Innovation, Quality, Collaboration and Inclusivity, our North Star for how we work. SiXworks is a leading provider of secure digital solutions, specialising in digital experimentation and focused on fail-safe-fast cutting-edge technology solutions deployed in highly secure environments.

As an end-to-end digital innovation and delivery partner, we turn complex challenges into mission-critical digital advantages. This is a thrilling time for us, with ambitious plans for growth. We are looking for brilliant, experienced, driven and self-motivated people to join the team on our journey.

We offer competitive salaries and a package that supports your wellbeing and development, including 25 days annual leave + bank holidays, free Private Medical cover and Life Assurance, Generous pension, Bonus and Professional development and training support. Additionally we have a newly re-furbished office space with a modern reception and facilities.

A word on UK Security Clearance 

Due to the secure nature of the position and working environment, you must have or be eligible to obtain higher levels of Government Security Clearance. More details relating to UK Security Clearance can be found here:  

United Kingdom Security Vetting: clearance levels - GOV.UK (www.gov.uk) 

Interested? 

Please apply!