Senior Application Security Engineer

JR United Kingdom; Kingston upon Hull; 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 their security protocols. This role requires a unique blend of software development and security expertise to ensure the integrity of the software delivery process. The successful candidate will work remotely and play a key role in architecting security controls while engaging effectively with engineering teams.

Qualifications

• Background in software development with strong Python skills.
• Deep application security knowledge and hands-on experience with cloud security.
• Experience with SAST, DAST, penetration testing, and threat modeling.

Responsibilities

• Embed security across the platform from source to production.
• Architect security controls and perform penetration testing ethically.
• Lead threat modeling and extend security automation with various tools.

Skills

Application Security

Software Development

Python

Threat Modeling

Penetration Testing

Container Security

API Security

Job description

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Senior Application Security Engineer, Kingston upon Hull, East Yorkshire

Client: Cloudsmith

Location: Kingston upon Hull, East Yorkshire, 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.
• 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. You’re fundamentally a software engineer. Experience with Python is essential, 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 building security tools.
• Bonus points if you have secured artifact systems or supply chains before.
• 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 with engineering teams to secure the Software Development Life Cycle (SDLC) without causing friction.

This job is remote but requires you to be located in the Island of Ireland or in the UK. You cannot work remotely from another country. Work permit sponsorship is not available.