Senior Application Security Engineer

JR United Kingdom; Preston; Remote; GBP 50,000 - 75,000; Full time

Job summary

A leading software supply chain company in Preston is seeking a Senior Application Security Engineer to enhance their security posture. You will embed security within the development process, conduct penetration tests, and collaborate with engineering teams to ensure secure coding practices. The role requires strong application security knowledge, proficiency in Python, and experience with cloud environments like AWS.

Qualifications

• Background in software development required.
• Deep application security knowledge essential.
• Experience with SAST, DAST, RASP desired.

Responsibilities

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

Skills

Python

Application security knowledge

Penetration testing

Threat modeling

Cloud security

Container security

API security

Infrastructure as Code (IaC)

CI/CD pipelines

Tools

AWS

CircleCI

GitHub Actions

DataDog

Job description

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Senior Application Security Engineer, Preston, Lancashire

Client: Cloudsmith

Location: Preston, Lancashire, 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 on services and infrastructure (ethically, please).
• 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 a proof of concept for fun.

You need:

• A background in software development. You’re fundamentally a software engineer. Proficiency in Python 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 penetration testing, threat modeling, and developing security tools.
• Bonus points for experience securing artifact systems or supply chains.
• Additional bonus if familiar with Firecracker, gVisor, or advanced security tools like Software Composition Analysis (SCA) and data enclaves.
• You believe security should enable, not block, engineering.
• You’re diplomatic and able to collaborate 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 outside these regions is not permitted.

Work permit sponsorship is not available.