Senior Application Security Engineer

JR United Kingdom; City of Edinburgh; Remote; GBP 60,000 - 90,000; Full time

Job summary

A renowned software supply chain company seeks a Senior Application Security Engineer to secure and streamline software delivery. In this role, you'll embed security controls, lead threat modeling, and enhance application security across distributed systems. Ideal candidates will possess strong software development backgrounds, especially in Python, and in-depth knowledge of application security practices.

Qualifications

• Background in software development essential.
• Deep application security knowledge required.
• Experience with SAST, DAST, RASP.

Responsibilities

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

Skills

Python

Application security

Penetration testing

Threat modeling

Container security

API security

Infrastructure as Code (IaC)

CI/CD pipelines

Job description

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Senior Application Security Engineer, Edinburgh

Client: Cloudsmith

Location: Edinburgh, United Kingdom

Job Category: Other

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EU work permit required: Yes

Job Views: 4

Posted: 31.05.2025

Expiry Date: 15.07.2025

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 on services and infrastructure (ethically, please).
• 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 repetitive tasks, and occasionally create a proof of concept for fun.

You need:

• A background in software development. You’re fundamentally a software engineer. Proficiency in Python is essential, and some TypeScript experience is a plus.
• 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 pen testing, threat modeling, and developing security tools.
• Bonus points for securing artifact systems or supply chains.
• Additional bonus if familiar with Firecracker, gVisor, or advanced security tools like SCA and data enclaves.
• You believe security should enable development, not hinder it.
• You’re diplomatic and able to collaborate effectively with engineering teams to secure the Software Development Lifecycle (SDLC).

This position is remote within Ireland or the UK. You must be physically located in these regions; remote work from outside these areas is not supported.

Work permit sponsorship is not available for this role.