Senior Platform Engineer (United Kingdom)

Second Front Systems, United Kingdom, London and Surrounding Areas

The role

Second Front Systems (2F) is seeking an ambitious and capable Platform Engineer to join our UK team. We are a dynamic, fast-growing defence technology company at the intersection of cutting-edge technology and national security, committed to delivering transformative solutions that empower the UK’s defenders. This is an opportunity to play a pivotal role in establishing and scaling our platform capability in the UK market.

What you need

5–7+ years of relevant experience in DevSecOps, systems engineering, and software development.
Senior-level expertise designing and building cloud-native platforms using AWS, Azure, or GCP.
Experience with Kubernetes, Docker, and cloud-native application orchestration.
Strong proficiency in Golang or similar languages
Familiarity with UK and international compliance frameworks such as MOD Secure by Design, JSP 453, NCSC Cloud Security Principles, NIST 800-53.
Experience deploying systems in air-gapped or classified environments.
Experience building and maintaining secure CI/CD pipelines and integrating security throughout the SDLC.
Hands-on experience implementing or managing SIEM, monitoring, and alerting systems.
Understanding of REST APIs, authentication flows, event-driven architecture, and microservice patterns.
Excellent written and verbal communication skills, with strong documentation habits.
Comfortable working independently and in distributed teams, managing competing priorities across complex projects.
Proficient in using AI tools (such as Claude and Gemini) to accelerate and enhance day-to-day work, from code generation, debugging, and documentation to research and problem-solving — with sound judgement about where AI adds value and where human oversight is required.
Certified AWS, Google or Azure Solutions Architect.
Prior experience working within UK defence, national security, or regulated government environments.
Experience working in early-stage or high-growth start-up environments.
Familiarity with UK accreditation and risk-management processes and environments (e.g., MOD Secure by Design).
Familiarity with GitLab, Google Workspace, and Slack.
A genuine interest in national security and mission-driven innovation.

The base salary for this position will fall between £110,00000 - £130,000 Your ultimate compensation will be determined by professional background, technical proficiency, seniority, and regional cost factors. Furthermore, this opportunity includes potential eligibility for equity awards and discretionary bonuses, rounding out a comprehensive total rewards offering.

Success at 2f looks like

Viewing obstacles as opportunities for growth
Having a bias toward action and tangible, measurable results
Striving to be both compassionate and direct with your feedback
Being team-oriented and inclusive with your actions

Senior Platform Engineer (United Kingdom)

The role

Senior Platform Engineer (United Kingdom)

The role

What you will do

What you need

Success at 2f looks like

UK employment information

Are you ready to join our team

Pay and benefits

About Second Front Systems

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Second Front Systems