Platform & Security Engineer

Cloud & Platform

• Own and maintain cloud infrastructure across AWS and container-based environments
• Design, build, and maintain infrastructure using Infrastructure as Code tools such as Terraform
• Support with future replatforming and infrastructure modernisation initiatives, including migration from Heroku to AWS container platforms

Security & Compliance

• Manage vulnerability remediation processes including CVE tracking, security patching, and maintaining regular patching cadences
• Support operational resilience (OR), disaster recovery (DR), backup strategies, and business continuity planning
• Help maintain and improve security and compliance processes aligned with ISO27001 framework

System Reliability & Observability

• Improve system reliability, scalability, resilience, and performance across the Mast platform
• Troubleshoot infrastructure, platform, networking, and security related issues across environments
• Contribute to incident response processes and ongoing operational improvements
• Build systems and tooling that automate infrastructure management and operational workflows wherever possible
• Implement and maintain observability tooling including monitoring, logging, alerting, and tracing

Developer Experience (DevEx)

• Building tools and platforms that enable product teams to provision resources autonomously (self-service)
• Building and maintaining CI/CD pipelines and deployment workflows to improve developer experience and delivery velocity
• Introducing guardrails for self-service cloud engineering by development teams

Requirements

• 5+ years experience in either platform engineering, cloud infrastructure, SRE, DevOps, or security engineering roles
• Strong experience with AWS and container based infrastructure
• Experience managing infrastructure using Infrastructure as Code tools such as Terraform
• Experience building and operating scalable, reliable production systems
• Experience with CI/CD pipelines, deployment automation, and developer tooling
• Working knowledge of Linux/Unix systems, networking, and cloud security fundamentals
• Experience with observability tooling including monitoring, logging, alerting, and tracing
• Experience supporting incident response, operational resilience, disaster recovery, or business continuity processes
• Comfortable working across infrastructure, security, reliability, and compliance domains
• Comfortable owning operational and infrastructure concerns end-to-end in a fast moving environment
• Strong communication skills and ability to collaborate effectively with both technical and non-technical stakeholders
• Comfortable using AI tools as part of your development workflow

Salary & Location

Location: London or UK Remote

Salary: £90,000 to £100,000 + Stock Options

Benefits

• Stock Option Plan
• 25 days holiday + bank holidays
• 4 - 10 weeks work from anywhere, based on tenure (for UK based roles)
• Vitality Health insurance
• Pension plan
• Equipment budget
• Learning & development budget
• Cycle to Work Scheme
• Monthly team socials + Quarterly Team Meet-ups @ HQ
• Digital-first, employee-first company with a flexible working culture + Central London HQ

Mast. ##### ABOUT US

Mast is a high-performance team of engineers and lending experts building the future of specialist lending technology. We value radical honesty, transparency, and speed. We hire exceptional people, expect a lot from each other, and offer real ownership, fast growth, and the chance to shape an industry.