Senior Application Security Engineer

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

Job summary

A leading software supply chain company is seeking a Senior Application Security Engineer to enhance its security measures across cloud-native systems. The role requires a strong background in software development, profound application security knowledge, and the ability to work collaboratively with engineering teams to ensure a secure software development life cycle. This position also involves architecturing security controls and performing ethical pen-testing, all while working remotely within the UK or Island of Ireland.

Qualifications

• Background in software development, specifically as a software engineer.
• Deep knowledge of application security and hands-on experience with security tools.
• Strong understanding of securing cloud environments, preferably AWS.

Responsibilities

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

Skills

Python

TypeScript

Application Security

Cloud Security

Pen Testing

Threat Modeling

Security Tools Development

Container Security

API Security

Infrastructure as Code (IaC)

Job description

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Senior Application Security Engineer, Telford

Client: Cloudsmith

Location: Telford, United Kingdom

Job Category: Other

EU work permit required: Yes

Job Views: 7

Posted: 07.06.2025

Expiry Date: 22.07.2025

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 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 practices.
• 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. Python is a must, and some TypeScript is a plus.
• 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 (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 you’ve worked with Firecracker, gVisor, or security tools like SCA and data enclaves.
• You believe security should enable, not block, engineering.
• You’re diplomatic and able to work collaboratively 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 outside these locations is not permitted.

Work permit sponsorship is not available.