Description
Saturn is a Series A-backed fintech transforming how financial advice is delivered. As a Security Engineer, you will own the security of the systems financial institutions trust with sensitive client data and regulated financial workflows: our applications, our cloud infrastructure and the engineering practices that produce them.
Responsibilities
•Application and API security across Saturn's web applications, backend services and integrations, including authentication, authorisation, session management and firm-level data separation
•AWS security, covering IAM, network controls, secrets, encryption and workload isolation
•Threat modelling and security review for new systems, financial workflows, external integrations and AI capabilities, joining projects early enough to change their design
•Vulnerability management end to end: discovery, prioritisation by real risk, remediation and verification across code, dependencies, cloud resources and employee systems
•Security tooling and automation, including checks built into CI/CD, so the same work is never done manually twice
•Detection and incident response, from logging and alerting through investigation and recovery, turning each incident into a lasting improvement to systems and controls
•AI security, including prompt injection, unsafe tool execution, retrieved data and sensitive information disclosure
•Evidence and assurance for SOC 2, enterprise security reviews and customer due diligence, plus the reusable security patterns engineering teams adopt as standard
Requirements
•3+ years in security engineering, software engineering, infrastructure security or a closely related role, with a track record of improving the security of production software or cloud infrastructure
•Strong command of common web and API vulnerabilities including the OWASP Top 10, and practical knowledge of authentication, authorisation, sessions, secrets and encryption
•Hands-on experience securing AWS or another major cloud platform, including IAM, network security and cloud-native controls
•You have run threat modelling and architecture reviews, and you recommend proportionate controls that fit the system and its stage rather than the textbook answer
•You can write software and automation in Go, TypeScript, Python or a comparable language, and you integrate security checks into how engineers already work
•Understanding of security logging, monitoring and incident investigation, and comfort owning a problem through investigation, remediation and verification
•You start from the likely harm and attack path, separate material risk from low-value security work, and prioritise sensibly with incomplete information
•You describe risks and mitigations clearly enough that engineers, customers and leadership can act on them, and you document accepted risks rather than leaving them implicit
Nice to have
•Security engineering in financial services or another regulated domain
•Application or product security for a B2B SaaS platform, including data isolation in multi-tenant systems
•AWS security services, infrastructure as code, and enterprise identity integrations such as OAuth, OIDC and SAML
•Detection engineering, SIEM or cloud security monitoring, incident response or digital forensics
•SOC 2, ISO 27001 or enterprise customer security reviews
•Penetration testing or working with external security researchers
Conditions
•Competitive salary with regular appraisals
•Competitive equity package at an early stage company with high growth potential
•Our beautiful new five-floor office, "The Dome", equipped with an onsite gym and roof terrace
•Best-in-class dental and medical insurance
•A dedicated budget for learning and professional development
•Access to an additional world-class gym and wellness centre two minutes from the office
•A tight-knit, ambitious team that cares deeply about quality and each other
