Security Engineer — FinTech AI & Cloud Security

Saturn; Greater London; Hybrid; GBP 90,000 - 150,000; Full time

Benefits offered by this job

Competitive salary and equity

Office in London

Learning and development budget

Dental and medical insurance

Gym and wellness facilities nearby

Job summary

Saturn is a Series A fintech building the AI-native operating system for financial advice. As a Security Engineer, you’ll own the security of critical systems handling real client data and regulated workflows across applications, cloud infrastructure and engineering practices.

You will help teams design secure systems, perform threat modelling, implement automation, and respond to incidents, ensuring Saturn meets regulatory expectations without slowing engineering velocity.

Qualifications

• 3+ years in security engineering or related role with track record improving production security
• Strong command of web and API vulnerabilities including OWASP Top 10 and auth/secrets/encryption
• Hands-on experience securing AWS or another major cloud platform and IAM/network security
• Threat modelling and architecture reviews with proportionate controls
• Ability to write software and automation in Go, TypeScript or Python and integrate security into engineers' workflow
• Experience in security logging, monitoring, incident investigation and remediation
• Ability to prioritise risk at startup pace with clear communication

Responsibilities

• Own security of Saturn systems including applications, cloud infrastructure and CI/CD pipelines
• Secure API surfaces, authentication, authorisation and data separation across services
• Perform threat modelling and security reviews early in projects
• Lead vulnerability management from discovery to verification across code and cloud resources
• Develop and maintain security tooling and automation to reduce manual work
• Drive detection, incident response and post-incident improvements
• Address AI security concerns including prompt injection and data exposure
• Provide evidence and assurance for SOC 2 and enterprise reviews

Skills

Security engineering

Application security

Cloud security

Threat modelling

Go

TypeScript

Python

CI/CD

AWS

Tools

OAuth

OIDC

SAML

Job description

Saturn is a Series A fintech building the AI-native operating system for financial advice. As a Security Engineer, you’ll own the security of critical systems handling real client data and regulated workflows across applications, cloud infrastructure and engineering practices.

You will help teams design secure systems, perform threat modelling, implement automation, and respond to incidents, ensuring Saturn meets regulatory expectations without slowing engineering velocity.