Senior Application Security Engineer

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

Job summary

A leading software supply chain company is seeking a Senior Application Security Engineer in Swindon. You will be responsible for embedding security controls, conducting threat modeling, and ensuring secure software development practices. Proficiency in Python and experience with cloud environments and application security are essential. The position supports remote work within Ireland or the UK.

Qualifications

• Proficiency in Python is essential, TypeScript experience is a plus.
• Deep knowledge of application security.
• Hands-on experience with SAST, DAST, and securing cloud environments (preferably AWS).

Responsibilities

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

Skills

Python

Application security

Container security

API security

Infrastructure as Code (IaC)

CI/CD pipelines

Penetration testing

Threat modeling

Security tools

Education

Background in software development

Job description

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Senior Application Security Engineer, Swindon, Wiltshire

Client: Cloudsmith

Location: Swindon, Wiltshire, 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 pen-testing services and infrastructure testing 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 repetitive tasks, and occasionally create proof of concepts 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 knowledge of application security.
• 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 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 processes.
• You’re diplomatic — able to collaborate effectively with engineering teams to secure the Software Development Life Cycle (SDLC) without causing disruption.

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

  Work permit sponsorship is not available.