pentester jobs in London

Astrum Search is seeking a Senior Consultant in cyber security for work across London, Birmingham, or Nottingham. The role emphasizes expertise in testing against NCSC, NIST, and CAF frameworks and hands-on offensive security and pen testing.The ideal candidate will hold industry certifications (PenTest+, CREST, OSCP, etc.), with experience using Kali Linux,...

Sarah's Cool Company is seeking a Security Engineer to manage the security posture of our software and protect against threats. You will conduct penetration tests, secure cloud infrastructure, and oversee SOC II controls while coordinating with the security team.Ideal candidates have 3+ years in penetration testing, strong Linux knowledge, and experience...

RSM UK Group LLP is seeking an enthusiastic Cyber Security Consultant to join our consulting team. You will deliver offensive security services including digital footprint reconnaissance, social engineering, penetration testing and vulnerability assessments for high-profile clients.Working with experienced specialists, you’ll scope assignments, conduct...

Barclay Simpson is seeking an experienced Application Security Engineer to join its security function in a hybrid role across the UK. The position focuses on secure code reviews, SAST/DAST, vulnerability assessments and embedding security throughout the CI/CD lifecycle.You will perform pre-release manual PenTesting and threat modelling, with strong emphasis...

Maria Petersen - Alpha Demo (For Product Release) is seeking a Security Engineer to manage security posture and protect the application from threats. You will perform web app pentests, secure cloud infrastructure, and oversee SOC II controls, with the ability to pull the plug on risky features.A strong background in security testing and proactive risk...

Hamilton Barnes is sourcing a Mobile Security Engineer (AppSec) for a 12-month hybrid contract in the UK, based in London or Bristol with 3 days on-site. The role focuses on the mobile channel security, delivering a framework, consulting, and penetration testing services for a major retail and banking organisation.The ideal candidate has 6+ years in mobile...

Matchtech is seeking an AI Software Engineer for a permanent remote role in the UK. You will design and deploy AI agents that automate penetration testing, build sandboxed lab infrastructure with Docker/Kubernetes, and deliver AI features from design through production with guardrails.The role emphasizes security tooling, evaluation, and cost optimisation....

Barclay Simpson is partnering with a leading UK financial services organisation to hire an Application Security Engineer. You will focus on secure code reviews, SAST/DAST, vulnerability assessments and embedding security throughout the CI/CD lifecycle.The role requires experience with OWASP Top 10, Veracode, DevSecOps, and cloud security across Azure/AWS,...

Synthesia - Marketplace Account is seeking a Security Engineer to manage our security posture and protect our application from threats. You will oversee pentesting, firewall management, SOC II controls, and security audits, with a focus on both red and blue team exercises.Ideal candidates have 3+ years in web app pentesting, cloud security and experience in...

trg. in London is seeking its first dedicated security hire to own security end-to-end for AI/LLM powered products; you'll threat model new features, drive CVE remediation, manage scanning tooling, perform pen tests and incident response.You'll shape the security function as the team scales, collaborating with engineering, product and operations; the role is...

Our AI Pentest product is gaining traction in a rapidly growing market, helping businesses rethink how they approach penetration testing. We’re looking for an Account Executive to build on that momentum, win new customers and drive revenue growthYou’ll own the full sales cycle, develop strategic partnerships and help scale our commercial presence in a...

🌍 We’re making security suck less for developers.Security tools haven’t kept up with how software is built today. They interrupt teams, slow releases, and turn security into a bottleneck instead of a capability. We built Aikido to change that. Aikido builds developer-first security products that reduce real risk without getting in the way of shipping...

Aikido is hiring an Account Executive to lead the full sales cycle for our AI Pentest product, winning new customers and driving revenue growth. The role involves owning the process from prospecting to close, managing opportunities, and developing strategic partnerships to scale our commercial presence.Remote-friendly with flexible hours, based in London or...

Aikido is hiring an Account Executive to own the full sales cycle for our AI Pentest product, driving revenue and building strategic partnerships. You will manage opportunities, follow up inbound leads, and prospect outbound opportunities, contributing to growth initiatives.Ideal candidates have a commercial background in a technical domain, proven startup...

DescriptionWe are looking for a Security Engineer to join Continuous Security Testing (CST), the AWS team that thinks like an adversary against systems running in production. You will follow real-world signals to where testing matters most, work out what an adversary could do, and leave behind detections and tools that keep watch long after you've moved...

We’re working with a leading UK financial services organisation looking for an experienced Application Security Engineer to join its security function. You’ll work closely with engineering and DevSecOps teams, focusing on secure code reviews, SAST/DAST, vulnerability assessments and embedding security throughout the CI/CD lifecycle. You will also do some...

At Stantec, we have some of the world’s leading professionals passionate about enabling our business to be its best. Our business teams include finance, procurement, human resources, information technology, marketing, corporate development, HSSE, real estate, legal, and practice services. We bring diverse backgrounds, skills, and expertise and create a...

Accenture UK & Ireland seeks a Cyber Security Penetration Testing Consultant to perform hands-on testing of client web apps, APIs and infrastructure across UK-wide engagements. You will operate within a collaborative team, report findings, and support remediation under CHECK/CREST guidance.With 2–4 years of practical pentesting experience and...

10Nex Consultancy in London is seeking a Security Testing Consultant to join a growing cybersecurity team. You'll perform penetration testing across web apps, infrastructure, cloud, and APIs, with opportunities to explore mobile, red teaming, and emerging security areas.You'll own testing engagements, write clear reports, present findings to clients, and...

TripleLift is seeking a Senior Application Security Engineer to drive secure software development and maturity within Engineering and Security. You will build a global security program based on NIST CSF, scale with automated testing, and promote secure SDLC across CI/CD pipelines.Responsibilities include threat modeling, vulnerability management, pentest...