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...

Founding CTO (+ Equity) at VC-backed AI security startup

Added 24/08/2026

An innovative, VC-backed startup at the forefront of AI security is seeking a visionary Founding CTO to join as a core member of the leadership team. This is a unique opportunity to take charge of the technology strategy and execution within a fast-paced, high-growth environment. As the Founding CTO, you will work closely with the founding team to define the technical roadmap, architect scalable solutions, and build a world-class engineering team. You will have significant influence over product direction and play a pivotal role in shaping the company’s culture and long-term success. Key responsibilities include designing and implementing secure, scalable...

Senior Endpoint & Security Engineer, London office

Added 04/09/2026

We are seeking a Senior Endpoint & Security Engineer to join a high-performing technology team based in our London office. This is a hands-on role for an experienced engineer who can take ownership of endpoint management, workplace security and the continuous improvement of a modern, resilient IT environment. You will help protect corporate devices, identities and data while enabling colleagues to work securely and efficiently across office, remote and hybrid settings. Your responsibilities will include designing, implementing and administering endpoint platforms such as Microsoft Intune, Configuration Manager and Entra ID, alongside device compliance, patching, software deployment, encryption and vulnerability remediation....

Security Engineer – Endpoint & Data Protection

Added 09/09/2026

We are seeking a Security Engineer – Endpoint & Data Protection to strengthen the security of endpoint environments, protect sensitive information and support the ongoing improvement of cyber defence capabilities. In this role, you will design, implement and maintain security controls across laptops, workstations, mobile devices, servers and cloud-connected endpoints. You will help ensure that systems are securely configured, monitored and maintained in line with established policies, regulatory expectations and recognised security frameworks. Your responsibilities will include managing and tuning endpoint protection, detection and response technologies; developing and maintaining data loss prevention controls; investigating security alerts and incidents; and supporting...

Staff Windows Low Level C++ Engineer - Endpoint security

Added 25/08/2026

We are seeking a Staff Windows Low Level C++ Engineer to help build and evolve advanced endpoint security technologies. You will work at the operating-system boundary, developing reliable, high-performance components that protect devices, applications and data against sophisticated threats. This role is suited to an engineer who combines deep Windows internals knowledge with strong systems programming skills and a passion for solving complex security challenges. Your responsibilities will include designing, implementing and maintaining security-focused Windows components in modern C++, including user-mode and kernel-mode functionality. You will investigate operating-system behaviour, process and memory activity, drivers, services, system calls, access controls and...

Endpoint Security Engineer

Added 11/08/2026

We are seeking a dedicated Endpoint Security Engineer to join our dynamic cybersecurity team. In this role, you will be responsible for designing, implementing, and managing endpoint security solutions to protect our organization's data and infrastructure. You will work closely with IT and network teams to ensure seamless integration of security measures across all endpoints, including laptops, desktops, and mobile devices. Your expertise will help assess security vulnerabilities, conduct regular audits, and respond to incidents effectively to maintain a robust security posture. The ideal candidate will possess a strong technical background in endpoint security technologies, including antivirus, anti-malware, and endpoint...

Technical Specialist – Zero Trust & Endpoint Security

Added 15/09/2026

We are seeking a Technical Specialist – Zero Trust & Endpoint Security to strengthen the protection of users, devices, applications and data across a complex technology environment. In this role, you will contribute to the design, implementation and continuous improvement of Zero Trust security capabilities, ensuring access is based on verified identity, device health, contextual risk and business need. You will work closely with infrastructure, identity, networking, cloud and service delivery teams to embed secure, practical and scalable controls across the organisation. Your responsibilities will include administering and improving endpoint security platforms, device compliance policies, endpoint detection and response, vulnerability...

Unified Endpoint Security Lab Lead

Added 20/08/2026

We are seeking a highly skilled Unified Endpoint Security Lab Lead to spearhead our efforts in developing and enhancing endpoint security solutions. In this role, you will be responsible for leading a team of security professionals, conducting research, and implementing innovative security technologies. You will collaborate with cross-functional teams to identify vulnerabilities, assess risks, and develop strategies to mitigate threats across a diverse range of endpoint devices, including desktops, laptops, and mobile devices. The ideal candidate will possess a strong background in cybersecurity, with expertise in endpoint protection platforms, threat detection, and incident response. You will oversee the design and...

Unified Endpoint Security Lab Lead

Added 20/08/2026

We are seeking a highly skilled Unified Endpoint Security Lab Lead to join our dynamic team. In this role, you will be responsible for overseeing the security operations of our endpoint environment, ensuring the integrity and protection of our systems against evolving threats. You will lead a team of security analysts and engineers, guiding them in the implementation of advanced security measures and the development of robust endpoint security protocols. Your expertise will be crucial in assessing vulnerabilities, conducting threat assessments, and responding to incidents to safeguard our technological landscape. Your primary duties will include designing and maintaining a comprehensive...

Junior Network Security Support Engineer

Added 17/09/2026

We are seeking a Junior Network Security Support Engineer to assist with the operation, maintenance and protection of network infrastructure across a dynamic technical environment. This is an excellent opportunity for an early-career professional who is keen to develop practical experience in network security, monitoring and incident response while working alongside experienced infrastructure and cybersecurity specialists. Key responsibilities will include monitoring network traffic, security alerts and system events; investigating and escalating suspicious activity; supporting the administration of firewalls, intrusion detection and prevention systems, secure gateways and access controls; and assisting with vulnerability assessments, patching and remediation activities. You will help...

Technical Security - Support Engineer

Added 04/09/2026

We are seeking a Technical Security Support Engineer to provide expert technical assistance and operational support across security systems, tools, and services. The successful candidate will help maintain a secure, resilient technology environment by responding to security-related incidents, investigating alerts, and supporting the implementation of effective controls. This role is suited to a technically capable professional who enjoys troubleshooting, collaborating with colleagues, and continuously improving security operations. Responsibilities will include monitoring and triaging security events, investigating suspected vulnerabilities or incidents, and documenting findings through clear and accurate reports. You will provide support for security technologies such as endpoint protection, identity...

Network Security Support Engineer

Added 01/09/2026

We are seeking a Network Security Support Engineer to provide technical support, monitoring, and maintenance for secure network environments. The successful candidate will help protect infrastructure, systems, and users by investigating security alerts, resolving network-related incidents, and supporting the implementation of effective security controls. This role will work closely with infrastructure, service desk, and cybersecurity teams to ensure that issues are identified and addressed promptly while maintaining a high standard of service. Key responsibilities include monitoring firewalls, intrusion prevention systems, VPNs, secure gateways, and network traffic for potential threats or operational issues. You will troubleshoot connectivity and security incidents, analyse...

IT Support Engineer & Cyber Security (L2+)

Added 20/08/2026

We are seeking an experienced IT Support Engineer & Cyber Security (L2+) to join our dynamic team. In this role, you will be responsible for providing exceptional technical support to our users, resolving complex IT issues, and ensuring the security of our systems. Your primary duties will include troubleshooting hardware and software problems, managing user accounts, and maintaining IT infrastructure. You will also participate in the implementation and monitoring of security protocols to protect sensitive information from potential threats. The ideal candidate will have a strong background in IT support, with hands-on experience in network administration and cybersecurity measures. You...

Vulnerability Management Support Engineer

Added 25/08/2026

We are seeking a Vulnerability Management Support Engineer to help strengthen the security and resilience of technology environments. In this role, you will support the identification, assessment, prioritisation and remediation of vulnerabilities across infrastructure, applications, endpoints and cloud services. You will work closely with security, infrastructure, development and service management teams to ensure vulnerabilities are accurately recorded, investigated and addressed within agreed timeframes. Your responsibilities will include operating and supporting vulnerability scanning tools, reviewing scan results, validating findings and helping to distinguish genuine risks from false positives. You will maintain accurate vulnerability records, produce regular dashboards and reports, track remediation...