Application Security Contract Jobs in London
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Teaching Assistant (Unqualified & Trainee's Accepted)
Posted 1 day ago by Jam Coding Worcestershire/Herefordshire
This role involves delivering Computing lessons for 10 hours per week in various schools across the London SW region, wi...
- Rate £25 per hour
- Category Undetermined
- Work type Onsite
- Location London, England, United Kingdom
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About Our Application Security Contract Roles in London
What does a application security contractor do?
Application Security contractors are engaged to identify, assess, and help remediate security vulnerabilities within software applications across the development lifecycle. The work spans a range of activities including secure code review, penetration testing of web and mobile applications, threat modelling, security architecture review, and the integration of security practices into DevSecOps pipelines. Application Security contractors are brought in when organisations need specialist security expertise that their development teams do not hold, when a specific application requires a security assessment ahead of launch, or when a security remediation programme requires dedicated resource.
Technical skills in Application Security contracting are deep and specialised. Contractors need strong knowledge of the OWASP Top 10 and broader application vulnerability classes, hands-on experience with penetration testing tools such as Burp Suite, and the ability to conduct both manual and automated security assessments of web applications, APIs, and mobile applications. Experience reviewing code for security issues across languages such as Java, Python, JavaScript, or .NET is a common requirement. For DevSecOps-focused roles, knowledge of integrating security tooling into CI/CD pipelines using tools such as SonarQube, Snyk, or Checkmarx is increasingly required. Relevant certifications including OSCP, CEH, or GWAPT are well regarded and frequently listed as requirements.
What is the market like for application security contractors?
Application Security contracting is a high-demand specialist market, driven by the increasing pace of software delivery and the growing recognition that security must be embedded in development processes rather than applied retrospectively. The shift towards DevSecOps across technology organisations is creating sustained demand for contractors who can work within agile engineering teams as well as conducting standalone assessments. Financial services, fintech, and e-commerce organisations are among the most active buyers, though demand is growing across all sectors that handle sensitive data or operate regulated digital services. Supply of experienced Application Security contractors remains limited relative to demand, supporting strong rate levels.
What is the contracting market like in London?
London dominates the UK contractor market by volume, depth, and rate levels. The capital concentrates the headquarters and major offices of most FTSE 100 companies, the largest global banks, the Big Four professional services firms, and the central government departments that collectively generate the majority of UK contract demand. Every contracting discipline covered on this site has active demand in London, from niche specialisms like threat intelligence and LLM engineering through to high-volume disciplines like project management and business analysis. The sheer density of employers means contractors in London typically have more choice of engagement at any given time than anywhere else in the UK. Day rates carry a premium of 15 to 25 per cent over the national average across most disciplines, reflecting both the concentration of complex, high-value programmes and the cost of operating in the capital.
How much do application security contractors usually earn in London?
Contract rates for application security roles in London typically range from £605 to £1045 per day, depending on the scope of the role, required expertise, and the delivery expectations of the engagement.
How many application security vacancies in London are there on Quality Contracts?
Over the past twelve months, we have tracked over 150 application security contract roles across the site, with London accounting for roughly one in three of those. Data reviewed up to June 2026.