Senior Application Security Engineer

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

Job summary

A leading software supply chain company is seeking a Senior Application Security Engineer in Dartford. The role involves integrating security throughout the software development process, ensuring systems are protected against vulnerabilities while enabling engineering efforts. Candidates should have a strong background in software development and application security, with knowledge in Python and cloud environments. The position is mainly remote but requires residence in the UK or Ireland.

Qualifications

• Experience in cloud security, preferably AWS.
• Hands-on experience with security automation and monitoring.
• Ability to write secure code and review others' code.

Responsibilities

• Embed security across the platform and lead security reviews.
• Conduct ethical penetration testing and extend security automation.
• Build tools and automate tasks to enhance security measures.

Skills

Python

TypeScript

Application Security

Penetration Testing

Threat Modeling

Container Security

API Security

Infrastructure as Code

Education

Background in Software Development

Tools

SAST

DAST

RASP

AWS

CircleCI

GitHub Actions

DataDog

Job description

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Senior Application Security Engineer, Dartford

Client: Cloudsmith

Location: Dartford, 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 encourage engagement).
• Conduct 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 others' code, and help improve everyone's 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, with experience in Python and some 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 points for experience securing artifact systems or supply chains.
• 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 efforts.
• You’re diplomatic and can work with engineering teams to secure the Software Development Life Cycle (SDLC) without causing disruption.

This position is remote but must be based in Ireland or the UK. Remote work from other countries is not permitted.

Work permit sponsorship is not available.