Lead Application Security Engineer

WeDo
Sheffield
6 months ago
Applications closed

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Lead Application Security Engineer / Ethical Hacker / Security Researcher


Location:Fully Remote (UK-based only)

Salary:Up to £130,000 base + Bonus

Sector:FinTech – Digital Payments / Credit Platforms


About the Company

We are partnering with a UK-based FinTech at the forefront of redefining consumer credit. With a secure, cloud-native platform and a mission to simplify the customer finance experience, this business is scaling rapidly while maintaining a deep focus on technology, security, and user trust.

With a mature DevSecOps environment and Secure SDLC already in place, this is an opportunity to join a business where security is embedded, respected, and essential.


The Role

We are seeking aLead Application Security Engineerwith a strong technical background in software and payment security. This is not a governance or compliance role. You will be responsible for identifying and addressing vulnerabilities in the company’s applications – particularly across authentication and payment processing systems – using manual techniques, ethical hacking, and creative security research.

You will operate as a subject matter expert in application security, reporting directly to the CIO and working closely with the Head of Information Security (compliance-focused). The successful candidate will also have the opportunity to shape and grow a team underneath them.


Key Responsibilities

  • Proactively identify application-level vulnerabilities across authentication, payment flows, and core transactional systems
  • Perform manual penetration testing, code reviews, and threat modelling across a modern FinTech platform
  • Collaborate with engineering teams to remediate risks and implement secure development practices
  • Take ownership of the company’s application security layer and continuously assess risk exposure
  • Act as a technical leader in all matters related to AppSec, working with architecture, development, and infrastructure teams
  • Support and improve the existing Secure SDLC and DevSecOps environment
  • Provide guidance on security in design, development, and implementation phases


Required Experience

  • Demonstrable hands-on experience inapplication security, penetration testing, or ethical hacking
  • Proven background incard payment systems, payment processing, or credit card platforms
  • Strong technical understanding of web applications, APIs, authentication, and data security
  • Ability to identify and exploit vulnerabilities manually – beyond commercial tools
  • Knowledge of OWASP Top 10, secure coding principles, and threat modelling frameworks
  • Experience working in or with high-compliance environments (e.g. PCI DSS, ISO27001)
  • Comfortable working independently in a remote-first environment
  • Right to work in the UK


Nice to Have

  • Experience working in a FinTech, payments, or digital banking environment
  • Familiarity with modern cloud environments (e.g. Azure, AWS)
  • Background in software engineering, particularly in secure coding or architecture


Interview Process

  • Initial conversation with Head of Engineering
  • Second-stage interview with the CIO
  • Final stage including a potential take-home technical exercise


What’s on Offer

  • Salary up to £130,000 base + performance bonus
  • Fully remote working (UK-based only)
  • High-impact, high-autonomy role
  • Opportunity to build and lead a growing application security function
  • Join a business with a strong engineering culture and security mindset already in place

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