Senior Application Security Engineer

JR United Kingdom; Stevenage; Remote; GBP 50,000 - 80,000; Full time

Job summary

A leading software supply chain company is seeking a Senior Application Security Engineer in Stevenage. The role involves embedding security measures, leading security reviews, and ensuring application and cloud security. Candidates should have a strong software development background, proficiency in Python, and experience in various security challenges.

Qualifications

• Background in software development and proficiency in Python and TypeScript.
• Deep application security knowledge and hands-on experience with security tools.
• Experience with SAST, DAST, RASP, and cloud environment security.

Responsibilities

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

Skills

Application Security

Penetration Testing

Software Development

Python

TypeScript

Cloud Security

Infrastructure as Code

Job description

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Senior Application Security Engineer, Stevenage

Client: Cloudsmith

Location: Stevenage, UK

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 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 develop proof of concept exploits for fun.

You need:

• A background in software development. You are fundamentally a software engineer. Proficiency in Python and some TypeScript is preferred.
• 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 for familiarity with Firecracker, gVisor, or advanced security tools like SCA and data enclaves.
• You believe security should enable, not block, engineering.
• You are diplomatic and able to work collaboratively with engineering teams to secure the SDLC without causing disruption.

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

Work permit sponsorship is not available.