Senior Application Security Engineer

JR United Kingdom; Norwich; 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 security across platforms. This role includes embedding security, performing penetration tests, and collaborating with engineering teams. Candidates should possess significant experience in application security, Python, TypeScript, and various security tools. Remote work within the UK or Ireland is permitted, aiming to secure systems effectively while enabling engineering functions.

Qualifications

• Background in software development, particularly in Python and TypeScript.
• Deep knowledge of application security.
• Hands-on experience with security testing tools and methodologies.

Responsibilities

• Embed security across the platform and architect security controls.
• Perform penetration testing and extend security automation.
• Write secure code and review others' practices.

Skills

Python

TypeScript

Application Security

Penetration Testing

Continuous Integration/Continuous Deployment (CI/CD)

Infrastructure as Code (IaC)

Container Security

API Security

Tools

SAST

DAST

RASP

CircleCI

GitHub Actions

DataDog

AWS Security Hub

Job description

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Senior Application Security Engineer, Norwich

Client: Cloudsmith

Location: Norwich, UK or Ireland (remote work allowed)

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 make them engaging).
• Perform penetration testing services ethically.
• Extend security automation and monitoring with tools like CircleCI, GitHub Actions, DataDog, AWS Security Hub, etc.
• Harden systems from container runtimes to APIs to artifact pipelines.
• Write secure code, review others' code, and help elevate secure coding practices.
• Build tools, automate tasks, and occasionally develop proof of concepts.

You need:

• A background in software development, especially in Python and TypeScript.
• 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 if you have secured artifact systems or supply chains before.
• Additional bonus if familiar with Firecracker, gVisor, or security tools like SCA and data enclaves.
• You believe security should enable, not block, engineering.
• You are diplomatic and able to work with engineering teams to secure the SDLC without causing disruption.

This position is remote within the UK or Ireland. You must be physically located in these regions; remote work from outside is not permitted.

Work permit sponsorship is not available for this role.