Senior Application Security Engineer

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

Job summary

A leading software supply chain company seeks a Senior Application Security Engineer in Basildon to enhance security across their platform. The ideal candidate will have a solid foundation in software development with essential skills in application security, threat modeling, and penetration testing, as well as a collaborative approach to work with engineering teams. This role offers the flexibility of remote work but requires candidates to be based in the UK or Ireland.

Qualifications

• Experience with DAST, RASP, securing AWS cloud environments.
• Hands-on experience developing security tools and conducting security reviews.
• Understanding of Infrastructure as Code (IaC) and securing artifact systems.

Responsibilities

• Embed security across the platform from source to production.
• Perform penetration testing and lead threat modeling efforts.
• Automate security practices and improve secure coding.

Skills

Python

Application Security

Threat Modeling

Penetration Testing

Container Security

CI/CD Pipelines

API Security

Education

Background in software development

Job description

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Senior Application Security Engineer, Basildon

Client: Cloudsmith

Location: Basildon, 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 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 practices.
• Build tools, automate repetitive tasks, and occasionally develop proof-of-concept exploits for testing purposes.

You need:

• A background in software development. You’re fundamentally a software engineer. Experience with Python is essential, and some knowledge of TypeScript 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 for securing artifact systems or supply chains.
• Additional bonus if you’ve worked with Firecracker, gVisor, or security solutions like SCA and data enclaves.
• You believe security should enable, not block, engineering efforts.
• You have diplomatic skills to collaborate effectively with engineering teams to secure the Software Development Life Cycle (SDLC), without causing friction.

This job is remote but must be based on the Island of Ireland or in the UK. Remote work from other countries is not permitted.

Work permit sponsorship is not available.