Senior Application Security Engineer

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

Job summary

A leading software supply chain company is looking for a Senior Application Security Engineer based in the UK or Ireland. You will embed security across the software delivery process, covering everything from cloud environments to APIs. Your mission will include performing penetration tests and collaborating closely with engineering teams to ensure a secure development lifecycle. This position supports a flexible remote working model within specified regions.

Qualifications

• Proficiency in Python and some TypeScript preferred.
• Deep application security knowledge and hands-on experience with security tools.
• Experience securing cloud environments (preferably AWS).

Responsibilities

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

Skills

Application Security

Penetration Testing

Threat Modeling

Cloud Security

SAST

DAST

Infrastructure as Code

CI/CD Pipelines

Secure Coding

Collaboration with Engineering Teams

Education

Software Engineering Background

Job description

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Senior Application Security Engineer, York

Client:

Cloudsmith

Location:

Job Category:

Other

-

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 other people’s 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 and some TypeScript 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, and CI/CD pipelines.
• Experience with penetration testing, threat modeling, and developing security tools.
• Bonus points if you’ve secured artifact systems or supply chains before.
• Additional bonus if you’ve worked with Firecracker, gVisor, or security tools like SCA and data enclaves.
• You believe security should enable, not block, engineering.
• You’re diplomatic and can collaborate with engineering teams to secure the SDLC effectively.

This job is remote within Ireland or the UK. You must be physically located in these regions — remote work from other countries is not permitted.

Work permit sponsorship is not available.