Senior Application Security Engineer

JR United Kingdom; Wakefield; Remote; GBP 50,000 - 80,000; Full time

Job summary

A leading software supply chain company in the UK seeks a Senior Application Security Engineer. The role involves embedding security throughout the software development lifecycle, leading security initiatives, and ensuring robust application security in cloud environments. Candidates should have a solid background in software development and rich experience in application security, including penetration testing and security tool development.

Qualifications

• Experience with SAST, DAST, RASP, and securing cloud environments.
• Background in software engineering, specifically Python.
• Hands-on experience in threat modeling and developing security tools.

Responsibilities

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

Skills

Application Security

Software Development

Penetration Testing

Threat Modeling

Container Security

Job description

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Senior Application Security Engineer, Wakefield

Client: Cloudsmith

Location: Wakefield, 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 services and infrastructure security assessments (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 level up their secure coding game.
• Build tools, automate boring tasks, and occasionally create a proof of concept for fun.

You need:

• A background in software development. At your core, you’re a software engineer. Python for sure and a bit of TypeScript never hurt anyone.
• Deep application security knowledge.
• Hands-on experience with SAST, DAST, RASP, and securing cloud environments (preferably AWS).
• Strong grasp of container security, API security, Infrastructure as Code (IaC), and CI/CD pipelines.
• Experience with pen testing, threat modeling, and developing security tools.
• Big bonus 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 — you need to work with engineering teams to secure the Software Development Lifecycle (SDLC) without causing disruption.

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

Work permit sponsorship is not available.