Principal Platform Engineer in London

About WatchTowr

WatchTowr is the Preemptive Exposure Management capability trusted by Fortune 500 companies and critical infrastructure providers. By combining proactive threat intelligence, real attacker telemetry, and automated red teaming, WatchTowr continuously identifies and validates real exposure so security teams can outrun real‐world threats. We are a global team of operators, researchers, and engineers who have spent years thinking like attackers. We are in a high‐growth phase and want exceptional people to join us.

We are looking for a Principal Platform Engineer with deep expertise in networking, distributed systems, and large‐scale infrastructure design to help us scale our automated scanning platform to global levels.

Responsibilities

• Architect, scale, and optimise our distributed scanning infrastructure, ensuring high throughput, low latency, and reliable operation at global scale.
• Advance DevOps performance and delivery excellence, continuously improving:

• Deployment frequency
• Change lead time
• Change failure rate
• Mean time to recovery

• Evolving from single‐region to multi‐region/global architecture
• Increasing data processing throughput across workflow pipelines
• Improving overall system availability, observability, and fault tolerance

Ideal Experience

• 8+ years designing and implementing scalable, distributed systems and high‐throughput networked architectures.
• Experience with cybersecurity platforms or security data at scale (ideally Threat Intelligence and/or Offensive Security‐type solutions).
• Proven experience building engineering organisations in early‐stage, B2B startups serving enterprise clients.
• Demonstrated track record scaling high‐throughput and distributed systems in production.
• Hands‐on experience with cloud infrastructure setup, operations, and maintenance.
• Experience working with cross‐functional teams delivering software using Agile methodologies.
• Strong understanding of OSI Layer 3+ networking concepts and performance optimisation.
• Experience owning, operating, and upgrading systems running in production.
• Direct experience scaling a platform from a single region to a multi‐region or global deployment.
• Exposure to cybersecurity platforms, high‐volume data processing, or other distributed compute environments.
• Technical proficiency across:

• Cloud service providers: AWS, Azure, GitHub
• Infrastructure‐as‐Code (IaC): Terraform
• Application platform: Kubernetes (AWS EKS), Helm, Docker, Docker Compose
• Observability: Elastic‐Fluent‐Kibana (EFK) stack, Prometheus, Jaeger/OpenTelemetry, Grafana
• Persistence: PostgreSQL (RDS), MongoDB, Redis, Elasticsearch, Kafka
• Delivery pipelines: GitHub Actions, AWS CodeBuild
• Workflow orchestration: Airflow, Kubernetes
• Software runtimes: Python, Node.js, Go

What's in it for me?

• Competitive compensation – we believe that hard work, skills and ambition should be fairly compensated.
• Meaningful role in a company – you will be a key and early contributor to a fast‐growing cybersecurity business that helps protect some of the world's largest enterprises.
• The best tools and powerful kit – we enable you with the tools to effectively fulfil your role.
• Endless opportunities – we are in a high‐growth phase of our journey, and plan to promote from within as we scale.
• Work with cyber security experts – we are solving cutting‐edge industry‐wide cyber security challenges with some of the world's most advanced organisations.

Equal Opportunity Employer

WatchTowr is proud to be an Equal Opportunity Employer. At WatchTowr, we're dedicated to fostering an inclusive, respectful, and diverse environment where every individual is recognised for their talent and potential. Our hiring decisions are guided by your capabilities, experience, and what you bring to the role – not by unrelated personal attributes.

We have a zero‐tolerance approach to any form of discrimination or harassment. This includes – but isn't limited to – discrimination based on race, ethnicity, religion, colour, nationality, sex, sexual orientation, gender identity or expression, age, disability, pregnancy or parental status, veteran status, or any other characteristic protected by law.

We actively encourage people from all backgrounds to apply. Even if you don't tick every box in the job description, we'd still love to hear from you.