Join our dynamic team at Blockchain as an Infrastructure Security Engineer. In this pivotal role, you will be responsible for designing, implementing, and maintaining robust security architectures to safeguard our cutting-edge blockchain technologies. Your expertise will be essential in identifying vulnerabilities, managing security incidents, and ensuring compliance with industry standards.We are looking for a passionate individual who thrives in a fast-paced environment and is eager to contribute to the future of decentralized technologies.

About the RoleJane Street is seeking a skilled Infrastructure Security Engineer with a robust background in Windows engineering and hands-on experience with contemporary platform security measures to enhance the security of our IT platforms globally. In this pivotal role, you will exercise sound judgement and a keen sense of priorities to manage complex remediation tasks effectively. Your insights will guide our mitigation strategies and provide essential technical guidance for the team.Your responsibilities will include proactively designing, testing, implementing, and documenting strategic security measures. You will lead the coordination and delivery of security solutions across our IT infrastructure while discovering opportunities to automate intelligent workflows. Your expertise will be vital in securing both internal IT and remote working environments through a blend of technical execution, consultancy, and influence over the broader IT team. This position encompasses a variety of tasks, including building scalable security controls, investigating emerging threats, developing innovative security tools, and spearheading vulnerability management initiatives.As part of our IT Engineering department, you will collaborate with a dedicated team of engineers who oversee our operations across a diverse physical and virtual computing landscape spanning three continents. Your analytical skills and technical proficiency will be crucial in supporting our colleagues' daily operations and maintaining our systems at peak performance.

Ebury empowers ambitious businesses to unlock global growth, and we extend the same philosophy to our team members. We promote innovation, collaboration, and problem-solving, creating an inclusive environment where everyone feels valued, supported, and empowered to thrive.If you are a collaborative individual eager to transform how businesses operate on a global scale, we invite you to connect with us. Discover how Ebury can fast-track your career and help you shape the future.Senior Security Engineer - Cloud InfrastructureHybrid (4 days in office) in LondonEbury is making significant investments in its cloud infrastructure security to ensure the integrity and safety of our global financial services. As a Senior Security Engineer specializing in Cloud Infrastructure, you will be responsible for enhancing and managing the security posture of our cloud environments across AWS and GCP, focusing on network security, perimeter defense, and attack surface management.This hands-on position requires extensive expertise in cloud-native security controls, network architecture, and proactive defensive security operations. You will design, implement, and maintain security infrastructure that identifies and mitigates threats before they affect our operations. Collaborating closely with platform, infrastructure, and security operations teams, you will embed security best practices into our cloud foundations.Key ResponsibilitiesManage cloud security posture and attack surface: Ensure comprehensive visibility and control across AWS and GCP environments. Implement cloud-native security monitoring, detection, and alerting mechanisms to proactively identify and mitigate threats, establishing and enforcing security baselines through policy-as-code.Design and oversee web application firewall infrastructure: Maintain WAF configurations across AWS and GCP, creating and fine-tuning detection rules in line with application threat models and emerging attack patterns. Develop operational processes for rule management and incident response integration, collaborating with application teams to implement protections without disrupting availability.Architect network segmentation and isolation: Design and implement strategies ensuring proper separation between development, staging, and production environments. Define consistent patterns across multi-cloud infrastructure, apply zero-trust principles to workload communication, and document reference architectures for engineering teams.

Join Us as an IT Security Engineer5ivetechlimited is seeking a skilled 3rd Line Infrastructure Engineer with a strong background in IT security, specifically with experience in Security Information and Event Management (SIEM) tools such as Splunk, LogRhythm, or QRadar.In this role, you will be responsible for setting up and maintaining networks, servers, and providing 3rd line Business as Usual (BAU) infrastructure support. We are looking for candidates who have successfully executed various security projects utilizing SIEM software.Your expertise will contribute to enhancing our security posture and ensuring our systems are robust and secure.Day Rate: £350

About the RoleWe are seeking a skilled DevOps Security Engineer to integrate security at every level of our infrastructure and deployment pipeline. Your responsibilities will include cloud security, vulnerability management, secrets management, and CI/CD hardening—ensuring that security is a core foundation rather than an afterthought. Reporting to the DevOps Manager, you will collaborate closely with our engineering team. If you believe that security should enhance speed rather than hinder it, this is the perfect role for you.Why ThreatAware?At ThreatAware, we empower security teams with a single source of truth for all devices and tools within their organizations. With over 150 integrations, our platform deploys in under 30 minutes, providing real-time visibility across entire IT estates. Trusted by finance, legal, energy, and healthcare sectors, we are now expanding our capabilities. With six years of precise cyber asset data, we are layering AI to innovate how security teams interact with their data, automate workflows, and proactively manage risks before they escalate. Your role will be critical in establishing secure foundations for this growth.Your ResponsibilitiesDesign and implement secure-by-default infrastructure that enables engineers to deploy confidently.Establish and enforce AWS security best practices: IAM, VPC hardening, encryption, and least-privilege access across all environments.Integrate security scanning into CI/CD pipelines, including static analysis, dependency scanning, container image scanning, and artifact integrity checks.Design and maintain a secrets management architecture, ensuring zero hardcoded credentials across the codebase.Support incident response efforts by investigating security events, containing threats, conducting root-cause analysis, and refining runbooks.Build and maintain observability across infrastructure and security through monitoring, alerting, and dashboards that highlight issues before they escalate.Promote a security-focused culture within the engineering team by delivering training, creating guardrails, and simplifying the process for developers to write secure code.What We Are Looking ForProven experience in DevSecOps or infrastructure security with practical expertise in AWS (IAM, VPC, Config).In-depth knowledge of CI/CD security, container security, and infrastructure-as-code security practices.Proficiency in TypeScript and/or PowerShell for automation.Experience with vulnerability scanning, secrets management tools, and compliance frameworks.Strong analytical and problem-solving skills, with a passion for security.

About Anaplan Anaplan builds AI-powered scenario planning and analysis tools that help businesses make smarter decisions. Over 2,400 organizations worldwide, including Fortune 50 leaders like Coca-Cola, LinkedIn, Adobe, LVMH, and Bayer, rely on Anaplan’s platform to stay competitive. Our teams share a strong commitment to client success and a culture that values innovation, diverse perspectives, and celebrating achievements at every level. We focus on strategic goals, value-driven work, and disciplined execution, creating space for growth, recognition, and connection. Role Overview: Principal Infrastructure Engineer Anaplan is hiring a Principal Infrastructure Engineer to lead the design and deployment of a multi-region HashiCorp Vault platform. This role serves as the Subject Matter Expert for secrets management and governance, supporting hundreds of engineers and global clients. This is a hybrid role based in London, with at least two days per week in the office. What You Will Do Architect, design, and implement a new multi-region HashiCorp Vault platform on public cloud infrastructure. Own the solution architecture, maintaining high-quality design documents and Architecture Decision Records (ADRs). Develop and test strategies to ensure platform resilience, including performance, Disaster Recovery (DR), and High Availability (HA). Act as the primary SME for Vault and modern secrets management, promoting best practices across the organization. Work closely with stakeholders, platform teams, and software engineers to integrate their services securely with the Vault ecosystem. Partner with Security to define and meet control requirements for the Vault platform, covering policy standards, privileged access, audit/evidence, and compliance needs. Lead regular security discussions and maintain a proactive security posture within the company.

Join Our Team as an IT Security Engineer!5ive Tech Limited is on the lookout for an experienced 3rd Line Infrastructure Engineer with a strong background in IT security. This role requires expertise in Security Information and Event Management (SIEM) tools such as Splunk, LogRhythm, or QRadar.As an IT Security Engineer, you will be responsible for setting up networks, servers, and providing 3rd line Business As Usual (BAU) infrastructure support. Your experience in handling various security projects and working with SIEM tools will be instrumental in enhancing our security posture.Join us and be part of a dynamic team dedicated to safeguarding our IT infrastructure!

Palantir Technologies is seeking an Edge Infrastructure Engineer in London to help develop and refine infrastructure solutions. This position involves working closely with teams from different disciplines to support the integration and performance of Palantir’s systems. Role overview This role focuses on building and optimizing infrastructure that supports Palantir’s products at the edge. Collaboration with engineers and other specialists is central to ensuring systems work together smoothly and deliver reliable results. Key responsibilities Develop and improve infrastructure solutions for edge environments Work with cross-functional teams to integrate new technologies and features Monitor and enhance system performance and reliability Location This position is based in London, United Kingdom.

Abound is changing how consumer lending works in the UK and beyond. By combining advanced AI with Open Banking data, the company looks at a person’s complete financial situation, not just a credit score, to make lending decisions that are fairer and more accurate. Since launch, Abound has issued over £1.3bn in loans, with a credit performance that outpaces industry averages. The company became profitable within 2.5 years and has backing from major investors, including Citi and Deutsche Bank. With over £2bn in funding, Abound is recognized as one of Europe’s fastest-growing fintechs. Role overview This Senior Security Engineer position is based in London and sits within the Platform team. The role blends DevSecOps responsibilities, serving as a bridge between product engineering and Corporate IT. As a hands-on contributor, the Senior Security Engineer critically reviews security architecture across both production and internal IT environments. During the first 6 to 12 months, the focus will be on designing and implementing next-generation cloud security architecture in AWS and GCP. The role also involves building and maturing internal SOC capabilities, particularly around detection and response. What you will do Manage Microsoft Sentinel to strengthen SIEM/SOAR capabilities Automate RBAC for identity and access management across AWS, Microsoft Entra, and internal systems Embed security controls into GitLab CI/CD pipelines, including scanning, infrastructure-as-code reviews, and automated policy enforcement Support a shift-left approach by integrating security throughout the software development lifecycle Technology stack Cloud & Compute: AWS, ECS Fargate, Aurora, Lambda, GCP Data Lake: S3, DMS, Glue Security & Identity: Microsoft Defender (XDR), Microsoft Sentinel (SIEM/SOAR), Defender for Cloud (CSPM), Microsoft 365, Entra, Intune Cloud Security Tooling: GuardDuty, Security Hub, Inspector, Security Command Center Code & Infrastructure: Terraform, GitLab CI/CD

airapps is hiring a Security Engineer to help safeguard digital assets and infrastructure in the London Metropolitan Area. This role centers on identifying weaknesses, managing security risks, and ensuring strong security measures are in place. Key responsibilities Identify vulnerabilities throughout information systems Reduce and address security risks as they arise Implement and maintain effective security protocols Support efforts to comply with relevant industry standards Help strengthen the company’s overall security posture Location This position is based in the London Metropolitan Area.

ABOUT AvolutionJoin Avolution, a prestigious global leader in Enterprise Architecture Software with over 20 years of experience. Our established presence spans across London, Sydney, Northern Virginia, and Singapore, and we are recognized in the Gartner Magic Quadrant as an industry frontrunner. Become part of our intelligent, friendly team, where your skills and initiative will drive our growth while enjoying a culture rated as collegial, collaborative, flexible, and supportive by our employees.Key ResponsibilitiesCloud & Infrastructure SecurityDesign, manage, and enhance security configurations across Azure and AWS environments, ensuring seamless integration with Office 365.Implement and enforce industry best practices for identity and access management (IAM) in Azure AD (Entra ID) and AWS IAM.Monitor cloud workloads for vulnerabilities, misconfigurations, and threats utilizing tools such as Microsoft Defender.Collaborate with DevOps/Engineering teams to embed security controls into CI/CD pipelines, advocating for DevSecOps principles.Conduct thorough security assessments, including aiding in penetration testing and risk evaluations to identify and mitigate potential vulnerabilities.Endpoint & Identity SecurityEnhance device posture, compliance, and management utilizing Microsoft Intune and Defender for Endpoint.Develop and maintain solid conditional access, multi-factor authentication (MFA), and endpoint protection policies.Oversee secure identity lifecycle processes, enforcing least-privilege access and zero-trust principles.Security OperationsRespond promptly to security alerts, incidents, and vulnerabilities with thorough investigations and remediation actions.Perform regular risk assessments, security reviews, and internal audits.Manage and optimize security tools, including SIEM, EDR, vulnerability scanners, and the Microsoft Defender suite.Lead incident response efforts and coordinate with cross-functional teams.Compliance & GovernanceSupport ISO 27001:2022 recertification and ongoing compliance activities, including internal audits.Prepare for and assist in obtaining additional compliance certifications (e.g., SOC 2, GDPR) to facilitate company growth.Develop, maintain, and enhance security policies, procedures, and technical documentation.Track, report on, and address audit findings or compliance gaps.Collaboration & CulturePartner with globally distributed teams across EMEA, AMER, and APAC regions.Educate internal teams on security best practices and cultivate a security-first culture through training and awareness initiatives.

Join Turner Townsend, a leading global consultancy, as a Security Cleared Digital Transformation Consultant specializing in Infrastructure. In this role, you will be pivotal in guiding organizations through their digital transformation journeys, leveraging your expertise to enhance operational efficiency and drive innovation.

Role Overview Aircall is looking for a Security Engineer focused on Product Security to help protect our products and platform. This role is based in our London office. What You Will Do Work with teams across engineering, product, and other functions to spot vulnerabilities and address them early in the development process. Implement security measures that fit our product development lifecycle. Lead security initiatives that strengthen customer trust and protect sensitive data. Support efforts to keep our security standards high as our platform evolves. Impact This role directly shapes the security of Aircall’s products and the safety of customer data. The work supports our commitment to strong security practices and helps maintain trust with our users.

Join Us in Shaping the Future of Cyber Security.At Quantexa, we believe in the power of innovation and continuous improvement. Our mission is to forge meaningful relationships with our clients and drive impactful change across various industries. With a diverse workforce comprising over 50 nationalities and 20 languages spoken, we foster an inclusive environment where every voice matters. Here, you will find the autonomy and support needed to craft a career that aligns with your aspirations.The Role.We are seeking a proactive and technically skilled Cyber Security Engineer to join our Security Operations team. In this hands-on role, you will be instrumental in safeguarding Quantexa's digital assets. Your responsibilities will include the operational management, optimization, and monitoring of essential security platforms, focusing on Zscaler, cloud monitoring via Wiz, and endpoint detection and response through CrowdStrike.Collaborating closely with the broader Security Operations team, you will ensure that security alerts, findings, and detections are efficiently triaged, validated, documented, and remediated. Your contributions will directly enhance Quantexa's security posture by minimizing risk, bolstering detection capabilities, and ensuring timely responses to security incidents.This position is ideal for a curious and detail-oriented professional who thrives on working with cutting-edge security tools, embraces disciplined execution, and seeks opportunities for ongoing improvement.Your Responsibilities.Wiz (Cloud Security Posture Management)Daily monitoring and triaging of Wiz findings, validating alerts and assessing operational impact.Engaging in tuning and threat hunting within Wiz and other security tools.Identifying misconfigurations, excessive permissions, and exposed assets while escalating issues as necessary.Tracking remediation progress with engineering teams and ensuring the resolution of high-priority issues.Zscaler (Web Security Tunnel 2.0)Reviewing and triaging Zscaler alerts and policy violations according to documented response procedures.Investigating suspicious traffic, access attempts, and user activity to determine legitimacy.

About the Position Jane Street is seeking a skilled Identity Security Engineer with expertise in engineering hybrid Windows platforms to become a vital member of our expanding team. Our IT Security team is committed to safeguarding access to Jane Street's IT systems. In this role, you will be instrumental in enhancing the organization's security posture through a blend of hands-on technical work and collaborative efforts with cross-functional engineering teams to initiate transformative security projects. Key Responsibilities: Serve as a technical security authority, offering insights on EntraID, M365, Azure tools, and security best practices. Lead the implementation and validation of robust security controls to minimize attack pathways between on-premises and external platforms. Identify security vulnerabilities and recommend operational improvements to meet our security standards. Provide technical guidance and influence cross-functional technology teams to facilitate cloud adoption. We are looking for an individual ready to make an immediate impact, capable of prioritizing work in a fast-paced environment. This position is more than just execution; we will rely on your judgment and quick thinking to guide our remediation and mitigation strategies for our Windows infrastructure. Your decisions will have far-reaching implications across the firm. About You: Possess a solid understanding of Microsoft security policies and configurations across Microsoft cloud services (SaaS/PaaS), IAM, and Privilege Access Management. Exhibit a strong grasp of industry-standard SSO technologies and authentication protocols (OpenID Connect, SAML, OAuth, Kerberos, LDAP, etc.). Have experience designing, implementing, and supporting Microsoft security infrastructure in live environments. Provide security recommendations regarding certificate policies, templates, and key sizes to uphold secure cryptographic standards. Manage and secure Azure resources utilizing a code-driven methodology. Be eager to develop scalable and repeatable security practices through automation, including certificate enrollment and renewal processes. Fluent in English. If you are a recruiting agency interested in partnering with us, please reach out to agency-partnerships@janestreet.com.

Join our dynamic team at Lendable as a Cyber Security Engineer, where you will play a pivotal role in safeguarding our digital assets and ensuring the integrity of our systems. In this position, you will be responsible for the design, implementation, and maintenance of security protocols across our network and applications. You will work closely with cross-functional teams to identify vulnerabilities and develop strategies to mitigate risks.

Application Deadline: We are actively conducting interviews and aim to fill this position promptly as soon as we find the right candidate.THE OPPORTUNITYApollo Research is searching for a Senior Security Engineer to take full ownership of security protocols and practices within our organization. As the first dedicated security hire, you will play a crucial role in maintaining the trust of our innovative AI lab partners and supporting our research mission. This position is embedded within the engineering team and reports directly to the CEO.YOUR RESPONSIBILITIES WILL INCLUDE- Establishing and leading Apollo's security program. You will create and manage the security roadmap, perform risk assessments, and adapt the program as the organization evolves, defining the security posture in relation to our size, threat model, and partner relationships.- Fostering trust with our AI lab partners. You will be the primary contact for security teams of our partners, building relationships with their CISOs, and ensuring our security practices are documented and meet the necessary standards for our partnerships.- Setting security strategies for engineering. You will define security principles and an AppSec strategy that the engineering team will adopt, creating efficient pathways for secure development.- Defining the use of AI tools and integrations at Apollo. You will determine approved tools, data handling procedures, and vetting processes for new technologies, ensuring a balance between security and the need for cutting-edge research tools.- Managing our security tooling stack and automating operations. You will select, implement, and oversee security controls such as EDR/MDR, endpoint management, email protection, and identity management, while automating processes wherever feasible.- Leading compliance and certification efforts. You will spearhead certification initiatives (ISO 27001, SOC 2) as required, integrating compliance into our security practices.- Managing IT administration across the organization. You will oversee Google Workspace and other IT resources.

About the PositionWe are excited to invite applications for the role of Windows Infrastructure Engineer at Jane Street. As a key player in our IT Engineering group, you will be responsible for maintaining and optimizing our internal Windows infrastructure. We welcome candidates who possess substantial expertise in infrastructure management, application support, automation, and Windows operating systems.Windows is the backbone of our desktop environment, and our essential infrastructure services rely heavily on Windows servers. Ensuring these systems operate seamlessly is vital for our business's performance and reliability.In this role, you will focus on enhancing, automating, and standardizing our Windows environment. Proficiency in scripting or programming languages, particularly PowerShell, Python, or C#, is highly desirable. Our scripts are systematically organized in a centralized repository, allowing for efficient collaboration and usage across various teams.As part of a global team, you will collaborate with colleagues both locally and internationally to develop innovative solutions, identify and resolve issues, plan and execute deployments, and document your findings.This position is situated within our dedicated IT Engineering team, which monitors and manages a Windows environment across a diverse global landscape. Your analytical skills and technical knowledge will be instrumental in supporting our colleagues' daily operations and maintaining our systems at peak performance.

Join us at Solve Intelligence, where we are pioneering AI-driven infrastructure for the global Intellectual Property sector. We are seeking a talented Infrastructure Engineer to develop the secure and scalable systems that drive our innovative solutions. Your Role: As an Infrastructure Engineer, you will collaborate with a highly skilled engineering team in London. Your focus will go beyond server management; you will architect multi-region, high-performance systems capable of processing complex AI tasks.Key Responsibilities:Cloud Architecture: Design, implement, and optimize our AWS infrastructure using Terraform for maximum reliability, cost-effectiveness, and scalability.Global Deployment: Create infrastructure patterns to support multi-region deployments and isolated environments tailored for enterprise clients.Developer Efficiency: Build and maintain CI/CD pipelines (using GitHub Actions and Docker) that enable our team to deliver features swiftly and securely.Monitoring & Reliability: Implement observability practices using OpenTelemetry and Datadog to proactively identify and resolve issues before they affect users.AI Performance Optimization: Fine-tune autoscaling and network routing to efficiently handle resource-heavy LLM workloads with minimal latency. About Solve Intelligence: We are a rapidly growing startup reinventing the IP industry.Growth: Achieving 20-30% month-over-month revenue increases; currently serving over 200 global IP teams, including DLA Piper and various tech companies.Impact: Our users experience efficiency improvements of 50-90% through our AI solutions.Funding: Recently highlighted in Sifted, following our $40M Series B funding round, bringing our total investment to $55M from prestigious investors like Y Combinator, 20VC, and others. Your Team: Work alongside a founding group of AI PhDs and top-tier systems engineers.