Senior Application Security Engineer

JR United Kingdom; Colchester; Remote; GBP 60,000 - 90,000; Full time

Job summary

A leading software supply chain company seeks a Senior Application Security Engineer to embed security into the development lifecycle. You'll be involved in architecting security controls, performing penetration testing, and leading security initiatives while working remotely within the UK or Ireland. The ideal candidate has a strong background in software development and hands-on experience with security practices, ensuring that security enhances engineering efforts.

Qualifications

• Strong background in software development as a software engineer.
• Deep knowledge of application security and cloud security.
• Experience with SAST, DAST, RASP, and CI/CD pipelines.

Responsibilities

• Embed security across the platform from source to production.
• Lead threat modeling and security reviews effectively.
• Perform ethical penetration testing services.

Skills

Python

TypeScript

Application Security

Penetration Testing

Threat Modeling

Security Automation

Container Security

API Security

Infrastructure as Code

Job description

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Senior Application Security Engineer, Colchester

Client: Cloudsmith

Location: Colchester, United Kingdom

Job Category: Other

EU work permit required: Yes

Job Views:

7

Posted:

07.06.2025

Expiry Date:

22.07.2025

Job Description:

Some people like building things. Others like breaking them. You? You love both and more importantly, you love stopping bad actors from breaking the things you helped build. If that sounds like your vibe, we’ve got a job you’ll want to see.

This job is with the software supply chain company - securing and powering how software gets delivered everywhere.

What you'll do:

• Embed security across the platform, from source to production.
• Architect security controls across distributed, cloud-native systems.
• Lead threat modeling and security reviews (and get people to enjoy them).
• Perform penetration testing services ethically.
• Extend security automation and monitoring with tools like CircleCI, GitHub Actions, DataDog, AWS Security Hub, etc.
• Harden everything from container runtimes to APIs to artifact pipelines.
• Write secure code, review others' code, and help everyone improve their secure coding skills.
• Build tools, automate tasks, and occasionally develop proof of concept exploits for fun.

You need:

• A background in software development. You’re a software engineer at heart, with experience in Python and some TypeScript.
• Deep application security knowledge.
• Hands-on experience with SAST, DAST, RASP, and securing cloud environments (preferably AWS).
• Strong understanding of container security, API security, Infrastructure as Code (IaC), and CI/CD pipelines.
• Experience with penetration testing, threat modeling, and developing security tools.
• Bonus: experience securing artifact systems or supply chains.
• Bonus: familiarity with Firecracker, gVisor, or advanced security tools like SCA and data enclaves.
• You believe security should enable engineering, not block it.
• You are diplomatic and can collaborate effectively with engineering teams to secure the SDLC without causing friction.

This job is remote within the Island of Ireland or the UK. You must be physically located here; remote work from outside these regions is not permitted.

Work permit sponsorship is not available.