Cyber Security Engineer (Junior/Entry Level) in London

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. When exploitation happens in hours, watchTowr delivers what no one else can: time to respond.

We are a global team of operators, researchers, and engineers who have spent years thinking like attackers – and we are now building the technology to stop them. Our work is recognised across the industry, with original vulnerability research from watchTowr Labs and innovations like Instinct and Attacker Eye shaping the future of cybersecurity. Backed by $29M in funding, recognised by Gartner, and scaling fast across the globe, we are in a high-growth phase of our journey. We are a young, high-energy, and research-driven team, obsessed with building world-class technology – and we want exceptional people to join us.

We are looking for an ambitious fresh graduate or early-career cyber security enthusiast engineer to join us and work with the watchTowr Labs to help expand our offensive security capabilities. You’ll work closely with senior engineers and researchers to help organisations understand how they could be compromised – in real time – by contributing to the systems and tooling that simulate real-world adversary behaviour at scale.

Sounds great – what will I do?

• Offensive Security Innovation: contribute to R&D projects that push the limits of offensive security, replicating adversary tactics at scale, helping to uncover vulnerabilities and provide actionable insights.
• Scalable Engineering: support the design and implementation of cloud-based infrastructure that underpins our offensive security tooling, learning how to build systems that operate at internet-wide scale.
• Cloud-Driven Engineering: work with cloud-native services to help develop resilient, big data solutions that form part of our offensive security & data processing capabilities.
• Data Pipeline Development: assist in building and maintaining robust data pipelines that seamlessly process attack surface & offensive security data, delivering real-time insights to enhance our Red Team capabilities.

What specifics are you looking for?

We would love to talk to you if you are passionate about cyber security and early in your career (final year of university or a recent graduate), together with the following traits:

• Offensive Security Foundations: exposure to offensive security concepts, tooling, or labs, with a strong interest in adversary tactics, techniques, and procedures (TTPs).
• Cloud Fundamentals: some experience or familiarity with cloud platforms and distributed systems.
• Curiosity and Problem Solving: a desire to learn, experiment, and tackle complex technical problems.
• Networking and Security Fundamentals: a solid understanding of core networking concepts, with an interest in how vulnerabilities can be exploited in real-world environments.
• Programming Skills: experience in Python, Go, or similar languages, with a strong emphasis on building scalable, maintainable code.
• Extracurricular Engagement: evidence of active interest in cyber security outside of formal study, such as participation in CTFs, security clubs/societies, hackathons, open-source projects, labs, or personal research projects.
• Relevant Academic Background: currently in the final year of, or a recent graduate from, a degree in Computer Science, Information Security, Cyber Security, or a closely related technical discipline.

Bonus Experience

It’ll also be great if you:

• Have worked on and/or contributed to open source projects.
• Have hands-on experience through labs, CTFs, or personal projects (e.g., red teaming experience, vulnerability research, or capture the flag competitions).
• Have a basic understanding of common vulnerabilities and weaknesses on application security, network security, or cloud security.

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.

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.