Senior Application Security Engineer

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

Job summary

A leading software supply chain company is seeking a Senior Application Security Engineer in High Wycombe. This role involves integrating security across cloud-native systems, conducting ethical pen-testing, and developing security automation. Ideal candidates will possess a strong software engineering background and deep application security expertise, including proficiency in Python.

Qualifications

• Background in software development essential.
• Deep knowledge of application security required.
• Hands-on experience with SAST, DAST, and AWS security.

Responsibilities

• Embed security across the platform from development to production.
• Lead threat modeling and security reviews.
• Perform ethical pen-testing on services and infrastructure.

Skills

Python

Application Security

Cloud Security

Pen Testing

Infrastructure as Code (IaC)

CI/CD Pipelines

Container Security

API Security

Job description

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Senior Application Security Engineer, High Wycombe

Client: Cloudsmith

Location: High Wycombe, 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 prod.
• Architect security controls across distributed, cloud-native systems.
• Lead threat modeling and security reviews (and get people to enjoy them).
• Perform ethical pen-testing on services and infrastructure.
• 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 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. You’re fundamentally a software engineer. Proficiency in Python is essential, and knowledge of 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 (IaC), and CI/CD pipelines.
• Experience with pen 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 work with engineering teams to secure the Software Development Life Cycle (SDLC) without causing disruption.

This position is remote within the Island of Ireland or the UK. Applicants must be physically located in these areas; remote work from outside these locations is not permitted.

Work permit sponsorship is not available for this role.