5 of 5 Contract High Availability Jobs in the City of London

Senior Network Engineer

Hiring Organisation
Adecco
Location
City of London, London, United Kingdom
Employment Type
Contract
Contract Rate
£450 - £500/day
across the institution. The successful candidate will contribute to the migration from Cisco to Extreme Networks infrastructure, with a strong focus on delivering robust, high-performing wired and wireless services that meet the needs of students, faculty, and staff. Key Responsibilities Support the design and implementation of network infrastructure … optimisation activities. Execute migration activities, including staging, deployment, testing, and validation. Troubleshoot and resolve complex network issues across LAN, WAN, and WLAN. Ensure high availability and performance of wireless networks, particularly in high-density environments (e.g., lecture halls, student accommodation). Assist with the production and maintenance ...

Unified Communications & Audio Visual Engineer

Hiring Organisation
McCabe & Barton
Location
City of London, London, United Kingdom
Employment Type
Contract
Contract Rate
Up to £300 per day
platforms across the business. This role blends deep technical UC engineering capability with hands-on AV and meeting support, ensuring reliable, secure, and high-quality collaboration experiences for end users, executives, and trading environments. The successful candidate will support and evolve platforms including Cisco CUCM, WebEx (Dedicated Instance), Microsoft … customer-focused mindset, operating within a global, distributed team. Key Responsibilities Unified Communications Engineering Design, configure, support, and enhance the global UC environment, ensuring high availability, performance, and security. Administer and troubleshoot Cisco Unified Communications Manager (CUCM), including dial plans, call routing, SIP integrations, upgrades, and incident resolution. ...

Senior Java Engineer (Payments)

Hiring Organisation
Randstad Technologies Recruitment
Location
City of London, London, United Kingdom
Employment Type
Contract
Contract Rate
£400 - £500/day
banking client as they move away from restrictive legacy "black-box" engines toward a flexible, cloud-native architecture. Your focus will be on delivering high-availability systems capable of handling millions of requests while ensuring strict compliance with ISO 20022 standards. Essential Skills 5 + years of hands ...

Cloud Telephony & Contact Centre Engineer

Hiring Organisation
CMC Markets UK Plc
Location
City of London, London, United Kingdom
Employment Type
Contract
stakeholders across IT, customer operations, and business teams to deliver requirements. Collaborate with vendors and third-party providers to implement and integrate solutions. Ensure high availability, resilience, and performance of telephony systems. Produce technical documentation, configuration guides, and implementation artefacts. Support testing, rollout, and post-migration stabilisation activities ...

IBM Mainframe Engineers / z/OS Systems Programmers Contract

Hiring Organisation
Essential Consulting
Location
City of London, London, United Kingdom
Employment Type
Contract, Work From Home
Contract Rate
From £500 to £575 per day (inside IR35)
This is an opportunity to join a large-scale enterprise environment, working on a complex and business-critical IBM z/OS estate supporting high-volume, mission-critical systems. We are interested in speaking with contractors with strong Mainframe infrastructure experience, particularly within z/OS environments, across areas … resolve complex production issues Work across core mainframe tooling including JCL, TSO/ISPF and SMP/E Support critical banking systems in a high-availability environment Contribute to both BAU support and project-based initiatives Key Skills & Experience: Strong experience within IBM Mainframe (z/OS) environments ...