> Markdown version of [/jobs/ext/3032336-application-security-engineer](https://www.wearedevelopers.com/jobs/ext/3032336-application-security-engineer). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

---

# Application Security Engineer

- **Company:** RemoteJobsOne
- **Location:** London, UK (Remote available)
- **Salary:** £62,400.0 - £208,000.0
- **Contract:** Contract
- **Skills:** Java (Programming Language), Application Programming Interfaces (APIs), Artificial Intelligence, Software System Penetration Testing, Automation of Tests, Software Bug Management, C++ (Programming Language), Code Review, Cyber Security, Data Structures, Software Debugging, Python (Programming Language), Node.Js, Open Web Application Security, Secure Coding, TypeScript, Rust (Programming Language), Enterprise Software Applications, Software Security, Backend, Codebase, Code Restructuring, Vulnerability Analysis, Golang
- **Published:** September 23, 2026
- **Apply:** https://www.adzuna.co.uk/jobs/details/5894631629

## About the Role

1. Strong backend experience in Java, Node.js, Go, Rust, Typescript, Python, C++ or similar
 2. A track record building scalable services and APIs
 3. Comfort with debugging, performance work and automated testing
 4. Solid code review instincts
 5. A cybersecurity or SecOps background is a big plus - secure coding, appsec, pentesting, vulnerability assessment, OWASP/CWE, or security-focused reviews., 1. Proven experience in backend development, with a track record of delivering high-quality and performant projects.
 2. Background in cybersecurity, such as penetration testing, vulnerability assessment, or security code reviews.
 3. Demonstrated success in identifying and resolving software bugs and system bottlenecks.
 4. Experience with codebase refactoring and implementing complex features in large-scale applications.
 5. Strong understanding of algorithms, data structures, and foundational computer science concepts.
 6. Excellent analytical, problem-solving, and technical communication skills.

A note on the process: our interview and assessment stages are designed to see how you think, so we ask that you complete them without outside assistance. The same applies once you're on the project - the value of the work comes from your own judgment.

## Description

Job Summary: In this role, you'll apply your expertise to help train next-generation AI systems. Your work will shape how models learn, reason, and perform through high-quality, real-world input. No prior experience in AI is required - your domain knowledge is what matters.

You'll create realistic, interesting and challenging coding tasks for AI to solve involving feature implementation and bug fixes, and implement deterministic verifiers that accept reasonable valid solutions and reject everything else.


## Related Videos

- [Go with the Flow: Stop the Leaks Before Your Memory's a Waterfall!](https://www.wearedevelopers.com/videos/100073-go-with-the-flow-stop-the-leaks-before-your-memory-s-a-waterfall)
- [Developing the Backend with Stefan Lingler, CTO at Shpock](https://www.wearedevelopers.com/videos/100360-developing-the-backend-with-stefan-lingler-cto-at-shpock)
- [Stop using Node.js like in 2020! What changed and what you can do today with Node.js](https://www.wearedevelopers.com/videos/100011-stop-using-node-js-like-in-2020-what-changed-and-what-you-can-do-today-with-node-js)
- [Security Pitfalls for Software Engineers](https://www.wearedevelopers.com/videos/726-security-pitfalls-for-software-engineers)
- [Scoring 2000 Products per Request: Performance Pitfalls in Golang](https://www.wearedevelopers.com/videos/2073-scoring-2000-products-per-request-performance-pitfalls-in-golang)
- [You can’t hack what you can’t see](https://www.wearedevelopers.com/videos/41-you-can-t-hack-what-you-can-t-see)

## Related Articles

- [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs)
- [Is Software Engineering Over-Saturated?](https://www.wearedevelopers.com/magazine/418-is-software-engineering-over-saturated)
- [The 12 Best Jobs for Software Engineers](https://www.wearedevelopers.com/magazine/401-the-12-best-jobs-for-software-engineers)
- [Why Upskilling And Reskilling is Important For Developers](https://www.wearedevelopers.com/magazine/428-why-upskilling-and-reskilling-is-important-for-developers)
- [Where to Find Entry-Level Software Engineering Jobs](https://www.wearedevelopers.com/magazine/397-where-to-find-entry-level-software-engineering-jobs)
- [Where To Find Software Engineering Jobs](https://www.wearedevelopers.com/magazine/396-where-to-find-software-engineering-jobs)