Senior Application Security Engineer

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

Job summary

A leading software supply chain company in Luton is seeking a Senior Application Security Engineer to enhance security practices across cloud-native systems. You will be responsible for embedding security into the software development life cycle, conducting assessments, and improving secure coding practices. This role offers the chance to work remotely within the UK or Ireland, focusing on ethical security measures.

Qualifications

• Background in software development with proficiency in Python.
• Deep application security knowledge and experience with securing cloud environments.
• Experience with SAST, DAST, pen testing, and threat modeling.

Responsibilities

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

Skills

Python

Application Security

Container Security

API Security

Infrastructure as Code

CI/CD Pipelines

Threat Modeling

Penetration Testing

Security Automation

Job description

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Senior Application Security Engineer, Luton, Bedfordshire

Client: Cloudsmith

Location: Luton, Bedfordshire, United Kingdom

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 others' code, and help everyone improve their secure coding practices.
• 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 is essential, and some TypeScript experience 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 pen testing, threat modeling, and developing security tools.
• Bonus points for securing artifact systems or supply chains.
• Additional bonus for experience with Firecracker, gVisor, or advanced security tools like SCA and data enclaves.
• You believe security should enable, not block, engineering.
• You’re diplomatic and able to collaborate effectively with engineering teams to secure the Software Development Life Cycle (SDLC).

This position is remote within the Island of Ireland or the UK. You must be physically located here; remote work from outside these areas is not permitted.

Work permit sponsorship is not available for this role.