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Job Summary: We are seeking a skilled and proactive Solace Messaging Administrator to join our Messaging team. You will be responsible for managing and supporting our enterprise messaging infrastructure built on Solace PubSub+, ensuring high availability, optimal performance, and reliability across production and non-production environments. This includes working on incident response, capacity planning, WAN optimization, and system observability using tools like Prometheus and Grafana. Key Responsibilities: • Administer and maintain Solace PubSub+ appliances and software brokers across environments (on-prem and cloud)., • Provide production support for messaging-related incidents, including root cause analysis and resolution., • Monitor system performance and health using Prometheus and Grafana; proactively identify and address anomalies., • Configure and optimize Solace across WAN environments, ensuring low-latency, secure, and reliable messaging., • Collaborate with development and application support teams to troubleshoot message flow issues and integration problems., • Perform capacity planning, scaling, and tuning of Solace infrastructure to meet current and future demand., • Automate routine maintenance tasks and support continuous improvement of operational processes., • Implement and maintain monitoring alerts, dashboards, and metrics to ensure visibility into the messaging layer., • Ensure compliance with security policies and participate in audits and vulnerability remediation., • Maintain accurate documentation, including topology diagrams, runbooks, and configuration baselines., • Support proprietary messaging APIs using C++, Java, Python, and C# programming languages., • Provide support for proprietary cache and gateways that integrate applications with the messaging service. Required Skills & Qualifications: • 3+ years of experience administering Solace PubSub+ messaging systems., • Strong background in production support, preferably in a 24x7 enterprise environment., • Experience working with distributed systems over WAN, with an understanding of networking, latency, and failover strategies., • Solid experience with Prometheus and Grafana for system monitoring and alerting., • Proficiency in troubleshooting message delivery, persistence, and topic routing., • Experience with capacity management, performance tuning, and system scaling., • Familiarity with Linux/Unix systems and scripting (Bash, Python, etc.)., • Strong analytical and problem-solving skills, with attention to detail., • Excellent communication and collaboration skills. Nice to Have: • Experience with containerized environments (Docker/Kubernetes)., • Exposure to other messaging platforms (Kafka, RabbitMQ, MQ)., • Understanding of DevOps tools and CI/CD pipelines., • Knowledge of cloud environments (AWS, Azure, GCP) and cloud-native Solace deployments. Why Join Us? • Join a multi-discipline team, delivering advanced Messaging APIs, developing tools, administering , supporting low latency, high throughput messaging system for prices, orders, trades, and mission critical applications., • Exciting opportunity to work with a wide array of technologies., • Chance to further develop your programming skills while administering and supporting one of the most advanced messaging systems available in the market.

Sybase SQL Database Administrator London - Hybrid 2x Days Weekly Onsite Contract until End of 2026 Start Date - 2nd Feb 2026 Required Skills • 7+ years’ experience with Sybase and/or SQL Server, including performance tuning and stored procedure development., • 2+ years’ experience in cloud environments with knowledge of IaaS, PaaS, and DBaaS., • Familiarity with RDS/PostgreSQL., • Strong ability to work under pressure and prioritise effectively., • Experience with at least one programming language., • Background in software development and delivery., • Some experience in Analysis, QA, Delivery Management, and/or Emerging Technologies., • Linux/Windows administration with scripting (shell/PowerShell)., • Exposure to DevOps, CI/CD (Jenkins, GitLab), Terraform, and Ansible., • Experience working in Agile environments. Desirable Skills • SAP Sybase IQ., • Database administration experience., • Sybase Replication / SQL Server Always On., • Terraform and Ansible., • Experience in financial markets., • Logical and physical data modelling (e.g., ERStudio)., • AWS DMS., • System/database decommissioning. Apply with your up-to-date CV in English.

OCI Cloud Administrator l Security Lead l Oracle Cloud Infrastructure l PaaS/IaaS l DV Cleared l Hybrid | Competitive PD l Outside IR35 l London Method Resourcing is working with a partnering consultancy that is looking for an OCI Cloud Administrator/Security Lead to take ownership of the secure operation of Oracle Cloud Infrastructure (OCI) within a highly regulated, security-critical environment. This role requires hands-on OCI experience and active DV clearance, with privileged administrator access across cloud and security tooling. Key Requirements: * Hands-on administration of OCI environments including tenancies, networking, compute, storage and IAM policies * Strong experience across OCI PaaS/IaaS services * Operation of security-critical tooling hosted in IaaS (logging, monitoring, vulnerability scanning) * Implementation and maintenance of preventative and detective security controls * Experience managing environment cloning and data masking activities * Support of secure test, backup and disaster recovery environments * Strong Linux background with experience using Terraform and infrastructure automation * Comfortable operating with privileged access in secure, regulated environments * DV clearance is mandatory Contract Details: * Location: On-site/Hybrid (London as required) * Security Clearance: DV (must be active) * IR35: Outside * Duration: Initial contract with extension potential * Rate: Competitive day rate For more information or to apply, please send your CV to (see below) . OCI Cloud Administrator l Security Lead l Oracle Cloud Infrastructure l DV Cleared l PaaS/IaaS l Hybrid | Outside IR35 l London RSG Plc is acting as an Employment Business in relation to this vacancy.

We are looking for a Cloud and Infrastructure Solutions Consultant to join CACI in London. We aim to be a trusted advisor to our customers at all engaged levels, giving a clear-eyed, data-driven view of the challenge at hand. A technical background is required for this role; key activities include team leadership and stakeholder engagement. Solution design, strategic planning, and service development skills will be called upon occasionally. Key Responsibilities • Technical Leadership: Direct the efforts of multi-disciplinary teams to deliver customer projects. Provide deep knowledge of public cloud, VMware virtualisation, domain services, and infrastructure architecture. Maintain awareness of industry trends., • Stakeholder Engagement: Synthesise information from a variety of sources into a clear high-level management overview. Communicate technical concepts clearly to stakeholders at all levels, enabling them to make informed decisions., • Technology Consultancy: Engage with business stakeholders and end users to identify issues and present high-level solutions with recommendations to management. Clear and professional written communication pitched appropriately to business or technical stakeholders is essential. Once a solution has been selected, produce or oversee the creation of high- and low-level designs to support delivery., • Service Development: Help to define and develop CACI’s cloud services, detailing the offering, approach, benefits, and capability requirements as they evolve within the market., • Collaboration and Development: Work with project teams composed of CACI and customer colleagues to ensure smooth interaction with customer teams and develop designs. Mentor and develop senior CACI engineers. Key Skills & Experience • Strong written and presentational skills., • Technical background focusing on virtualisation, cloud, and DevOps/IaC principles., • Logical approach to technical challenges., • Capable management of skilled engineering teams (direction, not line management)., • Strong relationship building skills, able to both lead projects to successful conclusions and navigate struggling projects through troubled times., • A degree of business acumen sufficient to engage at with other disciplines and at higher management levels. Desirable Skills & Experience • Cloud Solution Consulting, • Cloud Service Definition and Design, • ITT/RFP Cloud Solution Support Qualifications This role would suit a candidate with exposure to a broad range of technologies. They might have (or have had) these certifications: • VMware vSphere or Operations certifications, • VCP - VMware Cloud Foundation Administrator 2V0-17.25, • VCP - vSphere Foundation Administrator 2V0-16.25, • VCP - VMware Cloud Foundation Architect 2V0-13.25, • VCAP - Cloud Foundation 9.0 Operations 3V0-22.25, • Azure Solutions Architect, Network Engineer, or Security Engineer, • Microsoft Certified: Azure Solutions Architect Expert (AZ-305), • Microsoft Certified: DevOps Engineer Expert (AZ-400), • AWS Architect, Engineer (AWS-SAA, AWS-SOA), • Solutions Architect – Associate C03, • Solutions Architect – Professional C02, • CloudOps Engineer – Associate, • Terraform, Git, or other DevOps tool certifications., • Windows and/or Linux Operations certifications (e.g., MCSE, RHCSA, LPIC), • Cisco networking and security certifications (e.g., CCNA-DC, CCNP-DC) Flexibility The key to our success is our teamwork and collaboration. We take a hybrid approach – working remotely and coming into the office depending on the business demand and collaboration required as part of the delivery process. Benefits • Competitive salary, • Target based commission package, • Matched pension contributions up to 5%, • Life Insurance, • Personal Accident Insurance, • Private Health Insurance from 2nd anniversary, • Sickness & Disability income protection from 3rd anniversary, • On site gym membership at our Kensington Office. Equal opportunities CACI is proud to be an equal employer. Embracing the diversity of our people, we are on a journey to build a truly inclusive work environment where no one is treated less favourably due to ethnic origin, age, gender, veteran status, religion or belief, sexual orientation, marital status, and disability or health condition, actively working to prevent discrimination. As a Disability Confident employer, we will: • Provide reasonable adjustments in the recruitment process where requested (contact a member of the recruitment team on 020 7602 6000 to discuss individual requirements further)., • Offer people with health conditions and disabilities, meeting the minimum criteria for a role, an interview., • Our people are unique, and we encourage, and support them, to be confident in contributing to our inclusion journey.

Our client, a leading strategic trading firm, is looking for an Infrastructure Operations Engineer to support their Infrastructure team.The Infrastructure team is responsible for maintaining a resilient, high-availability Linux environment that supports large-scale compute workloads and mission-crit

This is a job posted by our partner Jooble.The most important part of their product will be the enterprise-grade technology platform written in.Twisted with a Django frontend.On a day-to-day basis, the Linux Systems Administrator will:.Please note that the full job description is not provided.To rea

In addition to all systems work both on the desktops and in the datacenters, Five Rings Systems Administrators frequently interact with users at various levels all across our organization. We are a Linux shop both on the server side and the trader desktops. Fluency in Linux administration is a must.

This is a job posted by our partner Jooble.The most important part of their product will be the enterprise-grade technology platform written in.Twisted with a Django frontend.On a day-to-day basis, the Linux Systems Administrator will:.Please note that the full job description is not provided.To rea

Monitor system performance, troubleshoot issues, and ensure high availability of trading systems. Senior Systems Administrator | VMware Expert. Linux Systems Administrator - Elite FinTech - up to £250K + Bonus.

Ensure system security, availability, and performance by applying patches, monitoring systems, and conducting regular audits. Perform root cause analysis on system failures and implement long-term fixes. Maintain documentation for system configurations, processes, and standard operating procedures.

Technical Support Specialist (with device focus).Technical Support Specialist (with device focus).Be among the first 25 applicants.Direct message the job poster from N Consulting Global.Lab Admin – Onsite | 6–12 Month Contract | London, UK.Linux environments, hardware management, and lab operati

A leader in defense and space technology is seeking an Infrastructure System Administrator to design and manage IT infrastructure for naval platforms.The role requires proven experience in IT infrastructure, strong skills in Windows and Linux environments, and hands-on experience with virtualization

OCI Cloud Administrator l Security Lead l Oracle Cloud Infrastructure l PaaS / IaaS l DV Cleared l Hybrid | Competitive PD l Outside IR35 l London Method Resourcing is working with a partnering consultancy that is looking for an OCI Cloud Administrator / Security Lead to take ownership of the secure operation of Oracle Cloud Infrastructure (OCI) within a highly regulated, security-critical environment. This role requires hands-on OCI experience and active DV clearance , with privileged administrator access across cloud and security tooling. Key Requirements: Hands-on administration of OCI environments including tenancies, networking, compute, storage and IAM policies Strong experience across OCI PaaS / IaaS services Operation of security-critical tooling hosted in IaaS (logging, monitoring, vulnerability scanning) Implementation and maintenance of preventative and detective security controls Experience managing environment cloning and data masking activities Support of secure test, backup and disaster recovery environments Strong Linux background with experience using Terraform and infrastructure automation Comfortable operating with privileged access in secure, regulated environments DV clearance is mandatory Contract Details: Location: On-site / Hybrid (London as required) Security Clearance: DV (must be active) IR35: Outside Duration: Initial contract with extension potential Rate: Competitive day rate For more information or to apply, please send your CV to . OCI Cloud Administrator l Security Lead l Oracle Cloud Infrastructure l DV Cleared l PaaS / IaaS l Hybrid | Outside IR35 l London RSG Plc is acting as an Employment Business in relation to this vacancy. TPBN1_UKTJ

Enterprise Services Principal Administrator (Data Centre) Skills: Azure, VMware Cloud Foundation (VCF), Azure Hybrid Services Must have designed a resilient hybrid data centre for a large enterprise Location: Hybrid - onsite 3 days per week - West London Role Purpose Our client is undergoing a multi-year transformation to deliver a modern, resilient, and evergreen hybrid infrastructure, built on cloud-native and software-defined data centre principles. The Enterprise Services Principal Administrator owns the end-to-end physical, virtual, and cloud infrastructure platforms. The role is responsible for shaping and delivering the infrastructure strategy, defining clear roadmaps, principles, and guardrails, and ensuring the platform is secure, scalable, and optimised. This role is central to the next 3-5 years of infrastructure transformation, combining strategic leadership with hands-on expertise, and working closely with Infrastructure, Application, Architecture, and Security teams. Key Responsibilities Own and deliver the hybrid infrastructure strategy and 3-5 year roadmap. Define current and future-state infrastructure landscapes. Lead cloud adoption and modernisation across the organisation. Establish and govern infrastructure standards, policies, and best practices. Provide technical leadership across on-prem, virtualised, and cloud platforms. Advise stakeholders on solution options, risks, costs, and benefits. Identify and mitigate infrastructure risks while maintaining architectural integrity. Drive continuous improvement, quality, and consistency across platforms. Collaborate with Enterprise Architecture, PMO, and delivery teams. Participate in the on-call rota. Key Technologies & Experience VMware VCF (NSX-T, Avi, Tanzu) Cloud & IaC: Azure, Terraform, Ansible, GitLab Containers: Kubernetes, Docker Swarm Operating Systems: Linux (RHEL, Ubuntu) Infrastructure: VMware, HPE, Cisco Networking: WAN/LAN/WLAN, Routing, Firewalls, IDS/IPS, Load Balancing, ZTNA Security & Identity: PAM, IAM, Active Directory, Entra ID TPBN1_UKTJ

Systems Administrator / Engineer (Solace Messaging Linux Networking) London / WFH to £100k Do you have Solace message system administration skills? You could be progressing your career at a global brokerage and technology firm, whilst enjoying a range of perks and benefits. As a Systems Administrator you will support the enterprise messaging infrastructure, built on Solace PubSub+. You'll be responsible for administering and maintaining Solace, providing production support for messaging related incidents, monitoring system performance and configuring and optimising Solace deployments in WAN environments to ensure low latency, secure and reliable messaging. You will collaborate with development and application support teams to troubleshoot message flows and resolve integration issues, whilst overseeing capacity planning, scaling and tuning of Solace infrastructure to meet both current and future operational demands, automating wherever possible. Location / WFH: You'll join colleagues in the prestigious Canary Wharf office, with flexibility to work from home 1-2 days a week. About you: You have strong commercial experience of administering Solace PubSub+ messaging systems, with a good understanding of its architecture and operational demands in enterprise settings You have experience in production support, ideally within a 24x7 environment You have experience of handling distributed systems across WAN, along with a good knowledge of networking concepts, latency management and failover strategies to maintain seamless operations You have a good knowledge of observability, having used tools such as Prometheus and Grafana You have strong troubleshooting skills You have a good knowledge of Linux Operating Systems and scripting skills with Python or bash to automate operational processes You're collaborative and pragmatic with great communications skills What's in it for you: Salary to £100k Private Health and Dental Insurance Life Assurance Pension Gym membership Apply now to find out more about this Systems Administrator / Engineer (Messaging Linux Networking) opportunity. At Client Server we believe in a diverse workplace that allows people to play to their strengths and continually learn. We're an equal opportunities employer whose people come from all walks of life and will never discriminate based on race, colour, religion, sex, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status. The clients we work with share our values. TPBN1_UKTJ

A leading tech recruiting firm is looking for a Senior Linux Systems Administrator to manage and optimize large-scale Linux infrastructure in a fully remote capacity.

This senior‑level Linux Systems Administrator (Red Hat) role focuses on managing and optimizing large‑scale Linux infrastructure in both production and development environments. Ideal candidates are proactive problem‑solvers with deep expertise in Ubuntu and Red Hat Enterprise Linux, skilled

Join a leading investment bank in London as a Senior Linux, AIX & Oracle Database Administrator, playing a key role in maintaining and evolving the technology platforms that power complex trading, treasury, and finance operations. Manage and maintain Linux (RHEL/Oracle Linux) and AIX servers across

They are currently seeking for skilled Linux System Administrator to join the team. Dealing with Linux servers at scale. Configure and maintain Ubuntu based Linux servers.

Roles & Responsibilities: Cloud and Linux Administrator. Linux Administration with a minimum of 3 years of work experience.

Senior Linux System Administrators. You’ll be part of a skilled technical team responsible for maintaining and improving secure Linux environments, ensuring stability, performance, and compliance. Provide 1st and 2nd line technical support for Linux-based systems and infrastructure.

Linux Sys Admin / Linux / VMware / ESXi / Linux / Windows / Python / Bash / PowerShell / Ansible / Terraform / containerisation / virtualisation / IaC / Infrastructure as Code / Security Cleared / Security Clearance / DV / DV Cleared / DV Clearance / Cheltenham / Gloucester. Experience in Linux, Con

Provide first and second level technical support on incidents and problems.Monitor overall system performance and ensure smooth system functionality.Create, maintain, and utilise documentation.Assist building compliance with processes and policies.What you will bring to the team.Excellent organisati

Job Title : Linux System Administrator. We’re looking for an Linux System Administrator to strengthen the ICT department and help manage the computer systems and software environments that our engineers use to build the microprocessors of the future. Install, configure, and maintain Red Hat Enterp

Provide first and second level technical support on incidents and problems.Monitor overall system performance and ensure smooth system functionality.Create, maintain, and utilise documentation.Assist building compliance with processes and policies.What you will bring to the team.Excellent organisati

As the Linux Administrator, you will help to maintain the efficient, secure, and reliable running of company infrastructure including installation, configuration, and maintenance of Linux and UNIX operating systems. Linux Administrator – £80,000 plus benefits - Kingston, Surrey – Hybrid working

Linux Engineer / System Administrator. Linux Engineer / System Administrator. Provide expert administration and support for secure Linux-based operational systems.

Bristol HQ (Hybrid Working – 2 days on-site, 3 days remote).You’ll be part of a collaborative environment where you’ll play a key role in both day-to-day operations and longer-term projects, working across infrastructure, automation, and containerised environments.Administer, configure, and su

Job Title: Linux Administrator. Infrastructure administration (Red Hat Linux/Kickstart/VM Ware Systems). Linux Administration: RHEL or similar (very strong practical application and experience).