Senior Application Security Engineer

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

Job summary

A software supply chain company seeks a Senior Application Security Engineer to enhance security measures across their platform. This position involves embedding security in all phases of software delivery, conducting penetration tests, and ensuring the Software Development Life Cycle (SDLC) supports security without hindrance. Candidates should have strong software development backgrounds, particularly in Python, and possess deep knowledge of application security practices including experience with AWS.

Qualifications

• Background in software development required.
• Deep application security knowledge expected.
• Experience with SAST, DAST, RASP, and securing cloud environments.

Responsibilities

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

Skills

Application Security Knowledge

Python

Threat Modeling

Penetration Testing

Cloud Security

CI/CD Pipelines

Job description

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Senior Application Security Engineer, Cambridge

Client: Cloudsmith

Location: Cambridge, UK or remote on the Island of Ireland

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 services and infrastructure security assessments (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 other people’s code, and help everyone level up their secure coding game.
• Build tools, automate boring tasks, and occasionally drop a ‘sploity’ proof of concept for fun.

You need:

• A background in software development. At your core, you’re a software engineer. Python for sure and a bit of TypeScript never hurt anyone.
• Deep application security knowledge.
• Hands-on experience with SAST, DAST, RASP, and securing cloud environments (preferably AWS).
• Strong grasp of container security, API security, Infrastructure as Code (IaC), and CI/CD pipelines.
• Experience with pen testing, threat modeling, and developing security tools.
• Big bonus if you’ve secured artifact systems or supply chains before.
• Additional bonus if you’ve worked with Firecracker, gVisor, or security solutions like SCA and data enclaves.
• You believe security should enable, not block, engineering.
• You’re diplomatic and can work with engineering teams to secure the Software Development Life Cycle (SDLC) without causing friction.

This job is remote on the Island of Ireland or in the UK. You need to be physically located here - remote work from other countries is not permitted.

Work permit sponsorship is not available.