Senior Application Security Engineer

JR United Kingdom; Shrewsbury; Remote; GBP 60,000 - 85,000; Full time

Job summary

A leading company in software supply chain security seeks a Senior Application Security Engineer in Shrewsbury, United Kingdom. You will be responsible for embedding security practices across systems, conducting penetration tests, and collaborating with software engineers to enhance security in the development lifecycle. The ideal candidate is a software engineer with strong application security knowledge and experience in cloud environments.

Qualifications

• Proficiency in Python and experience with TypeScript preferred.
• Deep knowledge of application security required.
• Experience with SAST, DAST, RASP, and securing cloud environments.

Responsibilities

• Embed security across the platform from source to production.
• Architect security controls and lead threat modeling.
• Perform penetration testing on services and infrastructure.

Skills

Python

Application Security

Pen Testing

Threat Modeling

Infrastructure as Code

CI/CD Pipelines

Container Security

API Security

Tools

AWS

CircleCI

GitHub Actions

DataDog

Job description

Social network you want to login/join with:

Senior Application Security Engineer, Shrewsbury

Client: Cloudsmith

Location: Shrewsbury, 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 on services and infrastructure 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 a software engineer at heart. Proficiency in Python is essential, and some experience with 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 pen testing, threat modeling, and developing security tools.
• Bonus points if you have 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 engineering, not hinder it.
• You’re diplomatic and able to collaborate with engineering teams to secure the SDLC without causing friction.

This role is remote within Ireland or the UK. You must be physically located in these areas; remote work from other countries is not permitted.

Work permit sponsorship is not available for this position.