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Senior Application Security Engineer

runtime • United Kingdom
Full Remote
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Leads threat modeling, secure code reviews, and security tooling for cloud-native AWS platforms. Requires hands-on security experience, software engineering background, and deep AWS security expertise. Focuses on peer collaboration with engineering teams to embed security early in development.

Key Highlights
Peer collaboration with engineering teams for security integration
Hands-on security tooling development (SAST, DAST, SCA, IaC hardening)
Focus on cloud-native AWS security and vulnerability remediation
Key Responsibilities
Lead threat modeling and secure design reviews with engineering teams
Conduct secure code reviews and coach engineers on vulnerability detection
Own SAST, DAST, and SCA tooling, including automation and integrations
Harden APIs, containers, IaC, and CI/CD pipelines across AWS
Run penetration tests and vulnerability assessments
Act as technical lead during incident response and red/blue exercises
Build security tooling from scratch to production standard
Technical Skills Required
Application Security (AppSec) AWS Security Secure Code Review
Benefits & Perks
Up to £130,000 + equity (IPO trajectory)
35 days annual leave + birthday off
Fully remote with flexible hours
Pension matched up to 8%
Private medical, dental, and optical cover
Paid sick leave, income protection, and life insurance
Nice to Have
Experience with CTFs, bug bounties, or home labs
Collaborative, low-ego teamwork style

Job Description

Built software first. Now you’d rather break it.

The problem: Most attacks exploit dependencies, packages, or libraries. This company builds infrastructure to address this, leveraging AI and cloud-native AWS stacks.

You’ll sit with engineering teams as a peer, reviewing designs and code, and building security tooling that runs in production. Key tasks include:

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