Senior Application Security Engineer

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

Job summary

A leading software supply chain company seeks a Senior Application Security Engineer in Guildford. This role focuses on embedding security across platforms and requires a solid software engineering background, deep application security knowledge, and experience with security testing. The position offers a unique opportunity to develop security tools while collaborating with engineering teams.

Qualifications

• Background in software development, preferably with Python and TypeScript.
• Deep application security knowledge with hands-on experience in SAST, DAST, and RASP.
• Experience securing cloud environments, especially AWS.

Responsibilities

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

Skills

Application Security

Penetration Testing

Python

Cloud Security

Threat Modeling

CI/CD Pipelines

API Security

Infrastructure as Code

Job description

Social network you want to login/join with:

Senior Application Security Engineer, Guildford

Client:

Cloudsmith

Location:

Guildford, 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 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 other people’s 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. At your core, you’re 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.
• Bigger bonus if you’ve worked with Firecracker, gVisor, or security automation tools like SCA and data enclaves.
• You believe security should enable, not block, engineering efforts.
• You’re diplomatic and able to collaborate with engineering teams to secure the Software Development Lifecycle (SDLC) without causing disruption.

This position 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 for this role.