Senior Application Security Engineer

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

Job summary

A leading software supply chain company is seeking a Senior Application Security Engineer in Northampton. This role involves embedding security into software production processes, handling threat modeling, and performing ethical penetration testing. Ideal candidates will have deep application security knowledge and a development background, especially in Python. The position is remote within the UK or Ireland but not available for sponsorship.

Qualifications

• Proficiency in Python; TypeScript is a plus.
• Hands-on experience with SAST, DAST, RASP, and AWS Cloud.
• Experience developing security tools; bonus for artifact systems and supply chains.

Responsibilities

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

Skills

Application security knowledge

Software development

Pen testing

Threat modeling

Infrastructure as Code (IaC)

CI/CD pipelines

Cloud security

Container security

Tools

CircleCI

GitHub Actions

DataDog

AWS Security Hub

Job description

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Senior Application Security Engineer, Northampton

Client: Cloudsmith

Location: Northampton, 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 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 other people’s code, and help everyone improve their secure coding skills.
• Build tools, automate boring tasks, and occasionally create a proof of concept for fun.

You need:

• A background in software development. You’re a software engineer at heart. Proficiency in Python and some TypeScript is a plus.
• Deep application security knowledge.
• Hands-on experience with SAST, DAST, RASP, and cloud security (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 for securing artifact systems or supply chains.
• Additional bonus if familiar 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 effectively with engineering teams to secure the Software Development Life Cycle (SDLC).

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

Work permit sponsorship is not available.