Hamilton Barnes

Mainframe Middleware Engineer - 6-Month Contract - Hybrid (London, or Edinburgh) We are seeking a Mainframe Middleware Infrastructure Engineer with strong expertise in CICS Liberty environments on z/OS. This role focuses on infrastructure engineering rather than application development, supporting modern, secure, and highly available Java workloads within CICS. You will work at the intersection of traditional Mainframe systems and contemporary integration and DevOps practices. Key Responsibilities Provide deep systems engineering expertise across CICS running on z/OS, including runtime behavior and infrastructure design Configure, maintain, and optimize IBM WebSphere Liberty within CICS (CICS Liberty runtime) Design and support secure, scalable, and resilient CICS Liberty environments aligned with enterprise standards Manage integration patterns, including REST/HTTP APIs and modern service exposure What You Will Ideally Bring Strong hands-on experience with CICS system setup and configuration (regions, JVM Servers) Solid understanding of z/OS components supporting CICS Liberty (USS, RACF, TCP/IP, SMF) Experience in capacity planning, performance tuning, and high availability/disaster recovery (HA/DR) Proven problem determination skills using dumps, traces, SMF data, and logs Expertise in WebSphere Liberty configuration (server.XML, features, shared libraries) JVM tuning on z/OS (heap sizing, garbage collection behaviour) Experience managing Java workloads within CICS (JVM server life cycle, diagnostics) Contract Details Duration: 6 months (with potential extension) Day Rate: Up to £400 per day (Inside IR35) Location: - Hybrid (2 days onsite per week) - London or Edinburgh Start Date: ASAP

OT Telemetry Specialist - 6 Month Contract - Inside IR35 - Hybrid in Warwick Contract Type: Initial 6 month contract (Inside IR35) Rate: £550 per day Inside IR35 Location: Hybrid in Warrington Role Overview: We are looking for an OT & Telemetry Specialist to join on a 6-month hybrid contract based in Warrington, UK (2-3 days on-site). The role serves as the programme's primary technical authority on outstation communications, telemetry systems, and SCADA integration, leading estate assessment and feasibility workstreams across an active operational technology environment in the utilities sector. Key Responsibilities: Act as technical authority for OT telemetry communications and SCADA integration, leading desktop-based assessment to produce a verified OT & Telemetry Asset Register using asset, GIS, and SCADA data Map end-to-end telemetry communication paths including primary, secondary, and fallback routes, and classify sites by operational and regulatory criticality Scope and assess Proteus to WITS Modern migration complexity, evaluating replacement telemetry bearer options against SCADA, latency, and protocol requirements Lead Ofcom UHF spectrum and licence compliance assessment, engaging with SCADA engineers and field technicians to capture undocumented operational knowledge Lead and support lab and live-site proof of concepts, validating SCADA integration, data integrity, and failover, and input into target architecture and migration sequencing What You Will Ideally Bring: 5+ years hands-on OT telemetry experience in regulated utilities or critical national infrastructure environments, with strong operational knowledge of utility SCADA platforms and historian data flows Proven expertise in RTU commissioning, configuration, and fault diagnosis, with deep knowledge of telemetry protocols - WITS Modern, Proteus, DNP3, IEC 60870-5-101/104, and Modbus TCP/RTU Practical understanding of Legacy UHF radio telemetry systems and the risks and complexities associated with migration programmes Solid knowledge of Ofcom radio licensing within the UK water sector, with experience in spectrum management and licence transition planning Familiarity with IEC 62443 and NCSC CAF applied to telemetry systems, and experience supporting parallel-run migrations with zero service disruption

PowerOn Reliance SCADA Engineer - Wokingham - 6 months - Inside IR35 We are hiring experienced PowerOn Reliance SCADA Engineers to support a major utilities programme, delivering critical system validation and integration across transmission SCADA environments. This role will focus on testing, configuration, and end-to-end validation of GE PowerOn Reliance (PoR) systems, ensuring successful deployment across complex operational landscapes. This is a delivery-focused role requiring strong hands-on expertise in SCADA systems, integration, and testing within live or near-live power environments. Key Responsibilities Design and execute testing and validation across GE PowerOn Reliance (PoR) SCADA and EMS systems Perform functional, non-functional, and integration testing across multiple environments Deliver end-to-end SCADA system validation aligned to business and operational requirements Create and execute detailed test plans, scenarios, and test cases Configure and support PoR components including Application Servers, Database Servers, FEP (Front End Processors), and Historian systems Collaborate with system integrators, vendors, and internal delivery teams to ensure alignment with requirements Support integration of SCADA systems with enterprise applications and external interfaces Act as a subject matter expert across SCADA testing and validation phases Work within Agile teams to support delivery, defect management, and reporting using tools such as JIRA/XRAY Ensure adherence to defined test strategies, standards, and processes Must-Have Experience Strong hands-on experience with GE PowerOn Reliance (PoR) SCADA Experience working within Transmission/Utilities SCADA environments Proven background in SCADA testing including FAT, SIT, UAT, and integration testing Experience in system validation, defect management, and test execution Experience configuring and supporting SCADA/EMS environments Strong knowledge of industry protocols including IEC 101, IEC 104, and IEC 61850 Experience integrating SCADA systems with enterprise platforms and external interfaces Strong understanding of SCADA architecture, data flows, and system dependencies Experience working within Agile environments using tools such as JIRA What's on offer? Day Rate: £425 per day (Inside IR35) Length: 6 months (Extension Potential) Start: ASAP Location: Wokingham (5 Days Onsite)

GCP Cloud Network Engineer - 6-Month Contract - Hybrid (Bristol, Leeds, Halifax, Manchester, or Edinburgh) We are looking for an experienced GCP Cloud Network Engineer to support teams in delivering modern, scalable cloud networking solutions on Google Cloud Platform. In this role, you'll help design, build, and modernise the Virtual Data Centre (VDC) network layer, curate reusable GCP cloud products using Infrastructure as Code (IaC), and drive best practices in cloud networking and DevOps automation. Key Responsibilities Design, implement, and manage GCP Virtual Data Centre (VDC) network architectures for enterprise workloads Configure and maintain VPCs, subnets, Firewall rules, routing, and VPC peering to ensure secure and scalable connectivity Implement hybrid connectivity solutions, including Cloud VPN and Interconnect, for on-prem and multi-cloud integration Develop and maintain Infrastructure as Code (IaC) for network resources using Terraform/Terraform Cloud Automate network provisioning and configuration using Python Scripting Enforce GCP Organisation Policies to meet security and compliance requirements (IP restrictions, encryption, access control) What You Will Ideally Bring Strong hands-on experience with GCP Networking (VPCs, subnets, Firewall rules, routing, peering) Proven expertise in Hybrid Connectivity (Cloud VPN, Interconnect) Solid experience using Terraform/Terraform Cloud for IaC Python Scripting for automation and orchestration Familiarity with CI/CD tools such as Jenkins, GitHub, or Harness Contract Details Duration: 6 months (with potential extension) Day Rate: Up to £500 per day (Inside IR35) Location: - Hybrid (2 days onsite per week) - Bristol, Leeds, Halifax, Manchester, or Edinburgh Start Date: ASAP

Azure Logic App Specialist - 6 months - Remote - Outside IR35 We are seeking a dedicated Azure Logic App Specialist for a 6-month contract to work directly with a key customer. This role involves designing and developing a series of playbooks, providing expert-level support and development of Azure Logic Apps in a fully remote capacity. Key Responsibilities: Design, develop, and maintain Azure Logic Apps workflows and playbooks. Utilize connectors effectively to integrate various services within Logic Apps. Implement error handling, monitoring, and best practices to ensure resilient cloud integrations. Act as the primary subject matter expert (SME) on Azure Logic Apps for the customer. Collaborate closely with the customer to deliver tailored Logic App solutions. Provide continuous support and troubleshooting for Logic App implementations. What You Will Ideally Bring: Deep hands-on experience with Azure Logic Apps and related connectors. Strong understanding of workflow design, error handling, and monitoring within Logic Apps. Proven ability to deliver resilient and scalable cloud integration solutions. Experience acting as a subject matter expert and trusted advisor on Azure Logic Apps. Excellent communication skills and ability to work closely with customers remotely. Strong problem-solving and analytical abilities. Contract Details: Duration: 6 months Location: Remote Day Rate: Up to £500 per day (Outside IR35) Azure Logic App Specialist - 6 months - Remote - Outside IR35

Sentinel SME - 6 months - Remote - Outside IR35 We are seeking an experienced Microsoft Sentinel SME for a 6-month contract to work directly with a key customer. This role involves designing and implementing advanced security playbooks, providing expert-level guidance, and delivering robust security monitoring and response solutions using Microsoft Sentinel. Key Responsibilities: Design, configure, and optimize Microsoft Sentinel environments for effective security monitoring. Develop and maintain custom analytics rules, workbooks, and playbooks. Implement automation and orchestration of incident response using Sentinel and related tools. Act as the primary subject matter expert (SME) on Microsoft Sentinel for the customer. Collaborate with stakeholders to tailor Sentinel use cases to the customer's security requirements. Provide ongoing support, tuning, and troubleshooting of Sentinel implementations. Ensure best practices for threat detection, incident response, and monitoring are applied. What You Will Ideally Bring: Deep, hands-on experience with Microsoft Sentinel and Azure security services. Strong understanding of SIEM concepts, log ingestion, and security operations workflows. Proven ability to design and deliver scalable and resilient security monitoring solutions. Experience acting as a trusted advisor/SME for security operations and SIEM tools. Excellent communication skills with the ability to work closely with customers remotely. Strong problem-solving, analytical, and threat-hunting abilities. Contract Details: Duration: 6 months Location: Remote Day Rate: Up to £500 per day (Outside IR35) Sentinel SME - 6 months - Remote - Outside IR35

Service Desk Associate - 6 months - Crawley- Inside IR35 We are seeking a proactive and technically skilled Service Desk Associate for a 6-month onsite contract role based in Crawley. The ideal candidate will be the first point of contact for IT-related issues, providing timely and effective support to end users across the organization. Key Responsibilities: Handle service desk requests including answering calls, responding to emails, and managing ticket submissions Reset passwords and assist users in regaining access to systems Perform basic troubleshooting for minor software issues and hardware glitches Support configuration challenges and simple setup problems Respond to user inquiries via phone, email, chat, or ticketing systems Log and track IT incidents and service requests accurately What You Will Ideally Bring: Solid understanding of IT infrastructure and common support tools Prior experience in a Service Desk, Helpdesk, or Technical Support role Technical proficiency at L1.5 level Excellent verbal and written communication skills Contract Details: Duration: 6 months (View for Extension) Day Rate: Up to £135 per day (Inside IR35) Location: Crawley Start Date: ASAP Service Desk Associate - 6 months - Crawley- Inside IR35