Cyber Security Lead

Location: King's Cross

Cyber Security Lead

 * £115,000 - £135,000

* Kings Cross

We're hiring a Cyber Security Lead to secure Descrial's product and cloud platform, and to show enterprise buyers that those protections hold up. We handle confidential investment data and our AI agents act on users' behalf, so it matters a great deal who and what can access each piece of data and what each agent is allowed to do.

You'll own security end to end, from decisions in the code to reassuring clients. The role is roughly 60% hands-on product and cloud security and 40% assurance and client-facing work.

About Descrial

Descrial is a startup inside a twenty-year-old company

Tres Vista has run the analytical work behind private capital since 2006. 2,000 people, 400+ clients including some of the biggest names in the industry, no outside capital and no outside board. That was the first chapter. And we enjoyed getting here!

The next chapter is harder and more interesting

We are moving from services to software, from one firm's workflows to an industry's, and from executing investment decisions to shaping how they get made. Thirty of us in King's Cross, small and senior, with day one founder intensity. At its fullest expression, Descrial changes how every serious investment firm decides.

The role

You report to the Head of Engineering, work with the Cloud Architect on AWS security and partner with Tres Vista's compliance organisation on certification readiness. You make security practical for engineers and credible in client reviews.

Your remit

The product and cloud

You own secure development practices: threat modelling, secure code review, dependency and secrets hygiene, and CI/CD security gates. With the Cloud Architect, you set AWS patterns for IAM, network segmentation, encryption, logging and detection.

The agent boundaries

You set defences against prompt injection and data leakage, tool-use guardrails and model-provider risk assessment. You define what an agent may do for a user, how authorisation is scoped by tenant and how actions are attributed and audited. You own AI supply-chain risk, including model and weights provenance, third-party assessments and detecting provider changes or deprecations.

The evidence

With Tres Vista, you drive SOC 2 and ISO 27001 readiness and prepare for ISO 42001 and EU AI Act obligations, owning the technical evidence. You run penetration testing and vulnerability management through scoping, remediation, verification and reporting. Alongside Compliance, you handle client questionnaires, due diligence and security terms in enterprise contracts.

The operating standard

You establish security monitoring and incident-response runbooks sized for a scale-up. You help engineers adopt secure practices and keep access and joiner/leaver discipline consistent across London and Bengaluru.

Your experience

* You have 7+ years in security engineering, including 3+ years securing cloud-native SaaS. AWS experience is strongly preferred.

* You have hands-on secure development and application-security depth, including threat modelling, code-level findings and OWASP.

* You have implemented SOC 2 or ISO 27001 certification programmes and can explain the evidence behind the controls.

* You have worked directly on client security questionnaires, audits or enterprise due diligence.

* You have a degree in engineering, computer science or a related field, or equivalent experience.

Useful to have, none required

* CISSP, OSCP, CCSP or comparable certifications

* Financial-services security or another regulated industry

* AI/LLM security, including prompt injection, model risk, data boundaries, ISO 42001 or the EU AI Act

* Experience as an early security hire

The reality

This will be difficult.

It demands pace and accuracy. We are building autonomous systems inside high-stakes live businesses, where decisions carry real consequences and impact and waiting for everyone to agree is not always an option.

The systems will sometimes get things wrong. In this phase the London team needs to create the evaluations, visibilities and safeguards that catch mistakes early, reducing them over time and stopping the same failures happening again.

If you want to build the foundations of an enterprise grade technology platform to service a multi-billion $ serviceable market opportunity, and share in that growth, this is your chance to join us.

In our conversations

Come ready to discuss three pieces of work:

* A security boundary you designed: the threat, implementation and evidence that it held.

* A…