Mast - Platform & Security Engineer

Remote - London, England, United Kingdom; UK (Remote)£90k - £100k/year+ Equity1mo ago

Remote Senior EMEA Cloud Computing Security Engineer Platform Engineer AWS Terraform Linux Ruby Ruby on Rails

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 • Desired Attributes • Desired Attributes • Thrives in fast-paced startup environments with a strong sense of ownership and urgency • Pragmatic and solutions oriented, with strong execution skills • Strong operational mindset and calm under pressure during incidents • Self directed, highly organised, and capable of driving initiatives independently • Curious and adaptable, with a continuous improvement mindset • Focused on building practical, scalable systems that improve operational efficiency and developer experience • Experience with Ruby on Rails applications and infrastructure is highly desirable

Responsibilities

• Cloud & Platform • 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 • 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

Benefits

• Location: London or UK Remote • Salary: £90,000 to £100,000 + Stock Options • Stock Option Plan • 25 days holiday + bank holidays • 4 - 10 weeks work from anywhere, based on tenure (for UK based roles) • Vitality Health insurance • 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 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.