At a Glance
- Tasks: Join us to scale and secure our innovative lending platform using cutting-edge technology.
- Company: Mast is revolutionising specialist lending with a dynamic, high-performance team.
- Benefits: Enjoy competitive salary, stock options, health insurance, and flexible working arrangements.
- Other info: Embrace a culture of transparency, ownership, and continuous improvement in a diverse environment.
- Why this job: Make a real impact in a fast-paced startup while shaping the future of lending technology.
- Qualifications: 5+ years in platform engineering or security roles, with strong AWS and Terraform experience.
The predicted salary is between 90000 - 100000 € per year.
Mast is on a mission to make complex lending simple. The UK's specialist lending market is underserved by technology, with legacy systems that can't handle the nuance of complex income, niche products, or the broker workflows that specialist lenders rely on. We're building modern, cloud-native lending technology, purpose-built for specialist lenders, that helps them process more applications in less time, reach decisions faster, and deliver better experiences for brokers and borrowers. We're pioneering the use of AI in mortgage origination, building it into the platform from the ground up rather than bolting it onto legacy architecture.
We're looking for a Platform & Security Engineer to help scale and secure the Mast platform as we continue to grow. This role combines platform engineering, cloud infrastructure, security, reliability, observability, operational resilience, and compliance. You'll work closely with the Head of Engineering to improve developer experience, modernise infrastructure, strengthen our security posture, and ensure our systems remain reliable and resilient as we onboard more clients and ship more features. This role is suited to an experienced engineer comfortable owning infrastructure, security, reliability, and operational resilience across production systems in a fast moving startup environment.
Responsibilities
- 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
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
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 is an equal opportunity employer and we celebrate diversity and are committed to creating an inclusive environment for all employees.
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.
Platform & Security Engineer in London employer: Mast
Mast is an exceptional employer that champions a flexible, digital-first work culture, allowing employees to thrive in a fast-paced startup environment. With a strong focus on employee growth through learning and development budgets, stock options, and generous holiday allowances, Mast empowers its team members to take ownership of their roles while contributing to pioneering lending technology. Located in London, the company fosters a collaborative atmosphere where innovation and diversity are celebrated, making it an ideal place for those seeking meaningful and rewarding employment.
StudySmarter Expert Advice🤫
We think this is how you could land Platform & Security Engineer in London
✨Tip Number 1
Network like a pro! Reach out to folks in the industry, attend meetups, and connect with people on LinkedIn. You never know who might have the inside scoop on job openings or can put in a good word for you.
✨Tip Number 2
Show off your skills! Create a portfolio or GitHub repository showcasing your projects, especially those related to cloud infrastructure and security. This gives potential employers a taste of what you can do and sets you apart from the crowd.
✨Tip Number 3
Prepare for interviews by brushing up on common technical questions and scenarios relevant to platform engineering and security. Practice explaining your thought process clearly, as communication is key in a collaborative environment like Mast.
✨Tip Number 4
Don’t forget to apply through our website! It’s the best way to ensure your application gets seen by the right people. Plus, it shows you’re genuinely interested in being part of our team at Mast.
We think you need these skills to ace Platform & Security Engineer in London
Some tips for your application 🫡
Tailor Your CV:Make sure your CV reflects the skills and experiences that align with the Platform & Security Engineer role. Highlight your experience with AWS, Terraform, and any relevant security practices to show us you’re the right fit!
Craft a Compelling Cover Letter:Use your cover letter to tell us why you're passionate about specialist lending technology and how your background makes you a great candidate. Share specific examples of your achievements in platform engineering or security to grab our attention.
Show Off Your Problem-Solving Skills:In your application, don’t just list your skills—demonstrate how you've used them to solve real-world problems. We love seeing candidates who can think critically and adapt in fast-paced environments like ours.
Apply Through Our Website:We encourage you to apply directly through our website for the best chance of getting noticed. It’s the quickest way for us to see your application and get you into the process!
How to prepare for a job interview at Mast
✨Know Your Tech Inside Out
Make sure you’re well-versed in AWS, Terraform, and container-based environments. Brush up on your knowledge of Infrastructure as Code and be ready to discuss how you've used these tools in past projects. This will show that you can hit the ground running.
✨Showcase Your Problem-Solving Skills
Prepare examples of how you've tackled complex issues related to security, reliability, or operational resilience. Think about specific incidents where you improved system performance or handled a disaster recovery situation. This will demonstrate your hands-on experience and ability to thrive under pressure.
✨Understand the Company’s Mission
Familiarise yourself with Mast's mission to simplify lending through technology. Be ready to discuss how your skills can contribute to their goals, especially in modernising infrastructure and enhancing developer experience. This shows genuine interest and alignment with their vision.
✨Communicate Clearly and Collaboratively
Since the role involves working with both technical and non-technical stakeholders, practice explaining complex concepts in simple terms. Highlight your communication skills during the interview to show that you can bridge the gap between teams effectively.
