Senior Application Security Engineer

JR United Kingdom; Chester; Remote; GBP 70,000 - 100,000; Full time

Job summary

A software supply chain security company is seeking a Senior Application Security Engineer in Chester, UK. The role involves embedding security practices, conducting assessments, and collaborating with teams to enhance secure coding practices. Ideal candidates will possess strong skills in Python and application security, along with experience in cloud environments.

Qualifications

• Experience with SAST, DAST, RASP, and securing cloud environments (preferably AWS).
• Knowledge of Infrastructure as Code and APIs.
• Ability to collaborate with engineering teams effectively.

Responsibilities

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

Skills

Python

TypeScript

Application Security

Container Security

CI/CD

Pen Testing

Threat Modeling

Secure Coding

Job description

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Senior Application Security Engineer, Chester

Client: Cloudsmith

Location: Chester, United Kingdom

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 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 others' code, and help everyone improve their secure coding practices.
• Build tools, automate repetitive tasks, and occasionally create a proof of concept for fun.

You need:

• A background in software development, with strong skills in Python and some TypeScript.
• 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 pen testing, threat modeling, and developing security tools.
• Bonus: experience securing artifact systems or supply chains.
• Additional bonus: familiarity with Firecracker, gVisor, or security tools like SCA and data enclaves.
• You believe security should enable engineering, not block it.
• You’re diplomatic and capable of collaborating with engineering teams to secure the SDLC effectively.

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.