Senior Software Security Engineer (£98k-£115k + Equity) at Harmonic Security Inc.

Added 03/09/2026

We are looking for a Senior Software Security Engineer to help build secure, resilient products in a fast-moving technology environment. This is a hands-on role for an experienced engineer who can combine strong software development skills with a deep understanding of application and cloud security. You will work closely with engineering, product and infrastructure teams to embed security throughout the software development lifecycle, from design and implementation through to deployment and ongoing improvement. The position offers a salary of £98,000–£115,000 plus equity. Your responsibilities will include designing and implementing secure, scalable services; reviewing code and architecture for vulnerabilities; developing security...

Founding AI Security Engineer / Researcher at Refractal

Added 01/09/2026

We are seeking a Founding AI Security Engineer / Researcher to define and build the security foundations for advanced artificial intelligence systems. This is an early, high-impact role for someone who is comfortable working across research, engineering, and product development. You will investigate emerging threats affecting machine learning models, AI agents, data pipelines, and deployment infrastructure, translating your findings into practical safeguards and scalable security capabilities. Your responsibilities will include designing threat models for AI systems; identifying vulnerabilities such as prompt injection, data poisoning, model extraction, insecure tool use, and adversarial manipulation; and developing methods to evaluate model and application...

Senior IT Support & Endpoint Security Engineer at Cloudnc

Added 03/09/2026

We are seeking a Senior IT Support & Endpoint Security Engineer to provide expert technical support and help maintain a secure, reliable, and efficient workplace technology environment. This role will combine hands-on troubleshooting with endpoint administration, security operations, and continuous improvement. You will act as an escalation point for complex technical issues, supporting users across a range of devices, operating systems, applications, and cloud-based services. Key responsibilities will include managing and securing laptops, desktops, mobile devices, and other endpoints throughout their lifecycle; administering endpoint management, identity, access, and security platforms; and monitoring device compliance, vulnerabilities, and security alerts. You will...

Cyber Lead - DevSecOps (CTO)

Added 01/09/2026

We are seeking an experienced Cyber Lead to drive the integration of security throughout the software development and technology lifecycle. This is a strategic and hands-on role responsible for establishing and embedding DevSecOps practices across engineering, cloud, infrastructure and product teams. You will help shape secure-by-design principles, improve development standards and ensure that security is treated as a shared responsibility across the technology function. Key responsibilities will include defining and implementing a DevSecOps roadmap; integrating security controls, testing and monitoring into CI/CD pipelines; strengthening application, cloud and infrastructure security; and supporting secure architecture and technical design reviews. You will lead...

Associate Director - Cyber M&A - Private Equity Focus

Added 24/09/2026

An opportunity has arisen for an Associate Director specialising in Cyber M&A, with a strong focus on private equity transactions. This role will support investors, portfolio companies and executive stakeholders through the assessment of cyber risk across acquisitions, disposals, carve-outs and post-deal transformation programmes. You will lead complex engagements from initial scoping and due diligence through to reporting, remediation planning and value creation, providing clear, commercially focused advice on the impact of cyber security on investment decisions. Responsibilities will include directing cyber due diligence reviews; assessing security governance, technology environments, resilience, data protection, third-party risk and regulatory exposure; identifying material...

Head of InfoSec at AIOS — Remote, $150-250k/yr inc equity

Added 18/08/2026

We are seeking a highly skilled and experienced Head of Information Security to lead our cybersecurity initiatives in a fully remote capacity. In this pivotal role, you will be responsible for developing and implementing a comprehensive information security strategy to protect our assets, data, and technology infrastructure. You will oversee the design and execution of security protocols, ensuring compliance with industry standards and regulations while fostering a culture of security awareness across the organization. Your responsibilities will include leading a team of security professionals, conducting risk assessments, and managing incident response efforts to address any security breaches effectively. You will...

Senior Offensive Security Engineer — Founding Security Hire

Added 01/09/2026

We are seeking a Senior Offensive Security Engineer to become the founding security hire and establish the foundations of a high-impact security function. This is a hands-on role for an experienced security professional who enjoys working across product, infrastructure, cloud environments, and organisational processes. You will define and execute a practical offensive security programme, identify meaningful risks, and partner closely with engineering and leadership teams to improve the security of systems, applications, and customer-facing services. Your responsibilities will include planning and conducting penetration tests, red-team exercises, vulnerability assessments, and threat-led reviews across web applications, APIs, cloud platforms, networks, and internal...

Founding Security Researcher

Added 11/09/2026

We are seeking a Founding Security Researcher to establish and lead the security research function from the ground up. This is a highly influential role for an experienced security professional who enjoys investigating emerging threats, translating technical findings into practical defensive strategies, and shaping the direction of a growing security programme. You will work closely with engineering, product, infrastructure, and leadership teams to identify risks, strengthen security controls, and build a culture of security by design. Your responsibilities will include conducting in-depth research into vulnerabilities, attack techniques, malware, exploitation methods, and relevant developments across the threat landscape. You will design...

Security Operations Engineer, AWS Security Cloud Response, Amazon Security Cloud Security Response

Added 14/10/2026

We are seeking a Security Operations Engineer to support cloud security response activities in a fast-paced, highly distributed environment. In this role, you will help protect cloud infrastructure, services, and customer data by investigating security events, coordinating incident response, and improving detection and response capabilities. You will work closely with security engineering, infrastructure, software development, and operations teams to identify threats, contain incidents, and reduce the likelihood of recurrence. Your responsibilities will include monitoring and analysing security alerts, conducting technical investigations, triaging suspected compromises, and supporting the full incident management lifecycle. You will develop and maintain incident response procedures, playbooks,...

M365 Security Consultant ( M365 security, Defender, Sentinel and Microsoft security stack.)

Added 19/08/2026

We are seeking a skilled M365 Security Consultant with a strong focus on M365 security, Microsoft Defender, Sentinel, and the broader Microsoft security stack. In this critical role, you will be responsible for designing, implementing, and managing security solutions that protect our clients’ environments. You will work closely with cross-functional teams to assess security requirements, identify vulnerabilities, and recommend appropriate security measures. Your expertise will help in developing security policies, procedures, and best practices tailored to Microsoft 365 environments. The ideal candidate will have hands-on experience with Microsoft security technologies, particularly Defender for Endpoint, Microsoft Sentinel, and Azure Active Directory....

Cyber Security Engineer, (Cloud Security Specialist)

Added 14/10/2026

We are seeking a Cyber Security Engineer, Cloud Security Specialist, to help protect cloud-based platforms, applications, data and infrastructure across a complex technology environment. This role will contribute to the design, implementation and continuous improvement of secure cloud services, while supporting security operations, risk reduction and regulatory compliance. The successful candidate will work closely with infrastructure, engineering, architecture, development and governance teams to embed security throughout the technology lifecycle. Key responsibilities include developing and maintaining cloud security controls across environments such as Azure, AWS or Google Cloud; managing identity and access controls, privileged access, encryption, key management, network security and...

Senior Security Engineer, AWS Security Verification & Validation Team

Added 14/10/2026

We are seeking a Senior Security Engineer to join a specialist Security Verification and Validation team responsible for assessing the resilience, security, and compliance of complex cloud-based services. In this role, you will help identify security weaknesses before they can affect customers, strengthen defensive controls, and promote secure engineering practices across a large-scale technology environment. You will work closely with software engineers, architects, incident responders, and risk specialists to evaluate systems throughout their development and operational lifecycles. Your responsibilities will include designing and executing security assessments, threat modelling exercises, penetration tests, architecture reviews, and control validation activities. You will investigate...

Security Engineer - Enterprise Security Platform

Added 14/10/2026

We are seeking a Security Engineer to help design, implement and maintain an enterprise security platform that protects critical systems, applications and data across a complex technology environment. You will work closely with infrastructure, cloud, application, identity and risk teams to deliver practical, scalable security capabilities and strengthen the organisation’s overall security posture. Your responsibilities will include engineering and administering security tools and services such as security information and event management, endpoint protection, vulnerability management, identity and access controls, network security and cloud security platforms. You will develop and maintain integrations, detection rules, dashboards, automation and operational procedures, while supporting...