Senior Application Security Engineer

JR United Kingdom; Newport; Remote; GBP 50,000 - 90,000; Full time

Job summary

A leading software supply chain company seeks a Senior Application Security Engineer in Newport. You'll embed security across various platforms and lead efforts in threat modeling, penetration testing, and building secure systems. With your development background and application security expertise, you'll collaborate with engineering teams to enhance the Software Development Life Cycle (SDLC). This role allows for remote work within the UK or the Island of Ireland.

Qualifications

• Background in software development required.
• Deep application security knowledge and hands-on experience.
• Strong understanding of container, API security, and securing cloud environments (AWS).

Responsibilities

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

Skills

Application Security

Python

TypeScript

Penetration Testing

Cloud Security

CI/CD Security

Tools

CircleCI

GitHub Actions

DataDog

AWS Security Hub

Firecracker

gVisor

Job description

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Senior Application Security Engineer, Newport

Client: Cloudsmith

Location: Newport, United Kingdom

Job Category: Other

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EU work permit required: Yes

Job Views:

9

Posted:

09.06.2025

Expiry Date:

24.07.2025

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 skills.
• Build tools, automate repetitive tasks, and occasionally create proof of concept exploits for fun.

You need:

• A background in software development. You are a software engineer at heart, with experience 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 (IaC), and CI/CD pipelines.
• Experience with penetration testing, threat modeling, and developing security tools.
• Bonus: experience securing artifact systems or supply chains.
• Bonus: experience with Firecracker, gVisor, or advanced security tools like SCA and data enclaves.
• You believe security should enable engineering, not hinder it.
• You are diplomatic and can work collaboratively with engineering teams to secure the Software Development Life Cycle (SDLC).

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.