Senior Application Security Engineer

JR United Kingdom; Ipswich; Remote; GBP 70,000 - 100,000; Full time

Job summary

A leading software supply chain company is seeking a Senior Application Security Engineer in Ipswich, UK. This remote role involves embedding security into systems, leading threat modeling, and performing penetration tests. Ideal candidates will have strong backgrounds in application security and a knack for collaboration with development teams.

Qualifications

• Proficiency in Python and some TypeScript.
• Deep application security knowledge.
• Experience with SAST, DAST, and securing cloud environments.

Responsibilities

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

Skills

Python

Application Security

Threat Modeling

Penetration Testing

CI/CD Pipelines

Container Security

API Security

Tools

AWS Security Hub

CircleCI

GitHub Actions

DataDog

Job description

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Senior Application Security Engineer, Ipswich

Client: Cloudsmith

Location: Ipswich, UK (Remote work within the UK is permitted)

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 on infrastructure and applications (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 testing.

  You need:

  • A background in software development, with proficiency 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: experience securing artifact systems or supply chains.
  • Bonus: familiarity with Firecracker, gVisor, or security assessment tools like SCA and data enclaves.
  • You believe security should enable, not block, engineering efforts.
  • You are diplomatic and can collaborate effectively with engineering teams to secure the Software Development Life Cycle (SDLC).

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

  Work permit sponsorship is not available for this role.