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Job Title: Senior .NET/JavaScript Full Stack Developer
Location: Limerick (Hybrid 2 days)
Type: 12 Months contract
Dayrate: €400-€450/day

Overview:
We are seeking a highly skilled Senior Full Stack Developer with strong expertise in .NET and JavaScript to join our dynamic engineering team. The ideal candidate will have a proven track record of building scalable web applications and delivering high-quality code across the full stack.

Key Responsibilities:

Design, develop, and maintain full-stack web applications using .NET (C#) and JavaScript frameworks (e.g., React, Angular, or Vue).Collaborate with cross-functional teams to define, design, and ship new features.Ensure the performance, quality, and responsiveness of applications.Participate in code reviews and mentor junior developers.Troubleshoot and resolve technical issues across the stack.

Required Skills:

Strong experience with .NET Core / ASP.NET MVC.Proficiency in JavaScript and modern front-end frameworks.Solid understanding of RESTful APIs and microservices architecture.Experience with SQL Server or other relational databases.Familiarity with CI/CD pipelines and cloud platforms (Azure/AWS).

Preferred Qualifications:

Experience with containerization (Docker, Kubernetes).Knowledge of Agile methodologies.Excellent problem-solving and communication skills.

GCS is acting as an Employment Business in relation to this vacancy.

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Service Desk Analyst (L1)
Location: Dublin (Fully On-Site)
Contract: 6 Months (Strong Likelihood of Extension)
Start Date: ASAP

Are you looking to join a growing IT support team in an exciting and fast-paced environment? I'm currently working with a well-established public sector organisation that is expanding its internal IT support function. They are seeking a personable and motivated Level 1 Service Desk Analyst to provide first-line technical support for users across multiple locations.

This is a fantastic opportunity for someone early in their IT career who is eager to grow and develop within a collaborative team. The role is fully on-site in Dublin and offers a strong chance of extension beyond the initial 6-month contract.

Key Focus Areas:ServiceNow: Logging, categorising, and escalating tickets using the ITSM platform.Office 365: Supporting users with Outlook, Teams, and other O365 applications.Active Directory: Assisting with password resets and basic account access issues.What You'll Be Doing:Acting as the first point of contact for IT support via phone, email, and ServiceNow.Troubleshooting issues related to Windows 10/11, Office 365, printers, and mobile devices.Providing clear, user-friendly guidance to non-technical users.Assisting with device setup and support during onboarding/offboarding.Collaborating with Level 2 support and contributing to knowledge base improvements.What We're Looking For:At least 2 years' of experience in a service desk or IT support role.Strong communication and problem-solving skills.Familiarity with ServiceNow (or similar ITSM tools), Office 365, and Windows environments.Exposure to Active Directory is a plus.A proactive attitude and a willingness to learn and grow.

This is more than just a support role - it's a chance to be part of a growing team where your contributions will be valued and your career can progress.

GCS is acting as an Employment Business in relation to this vacancy.

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Location : Hammersmith, London (Hybrid - 2 days onsite/ week)

Duration : 6 months Extendable, moving to permanent afterwards

rate : GBP 410 - 500 p/d Inside IR35

TECHNICAL SKILLS

Must Have

a Data Analystcard processingPayment OperationsSnowflake or SQLtableau - creating reports

Responsibilities

Provides support to acquirers, network-to-network partners, issuers, and processors. Researches complex situations and supports participants with operationsSupports business development teams to expand acceptance and Approval rates optimization Supports participants through the semi-annual release process. Manages and coordinates certification.Ensures participants are in compliance with operating rules and regulations. Responsible for EMEA Compliance activities co-ordination (e.g. waivers, auditing) and BCP data reviews.Engages participants and internal stakeholders to support network initiatives. Settlement issue/resolution co-ordination (Rupay & others) and ProtectBuy/SCA central project management/coordination.Analyzes end-to-end transaction processing, troubleshoots issues and acceptance complaints, and supports issuer & Acquirer launches. Lead Salesforce effort to maximise efficiency and automate EMEA reporting.Manage EMEA data & presentations for forums, business reviews and ad-hoc reporting.Coordinate with Snr Mgrs & Dir. Employee engagement activities.

GCS is acting as an Employment Business in relation to this vacancy.

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QA Lead - Finance / Payments / Contract

Lead QA working on an integral payment system for a major finance company within their payments team. Emphasis on API testing.

Role - QA Lead

Duration - 6 months with very likely extension

Rate - Negotiable

Location - Hybrid / Hampshire - 3 days per week in the office

Skills -

Experience with Java, Junit, Cucumber, Gherkin, Gatling, Xray, Selenium Webdriver, TestNG, Pact Testing, API Testing Frameworks. AWS expertise preferred.Hoppscotch or Postman experience testing APIsExperience identifying test cases using boundary valuation analysis, negative testing, etc.Drives quality discussions around requirements in refinementPayments network experienceExposure to modern software testing practices including but not restricted to Test Automation, Test First, TDD, ATDD and BDD.Experience in DevOps (preferably working with containerized environments) and build tools using Jenkins CI/CD, Gradle, Github, Nexus and SonarQube and other code coverage tools preferred.Experience testing and implementing API service architecture with Spring Boot.3+ years of Hands-on Test Automation required.

GCS is acting as an Employment Business in relation to this vacancy.

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Senior Infrastructure/Automation Engineer - Contract (Sheffield, 3 Days On site)

Location: Sheffield (3 days on site per week)

Contract Duration: Fixed-term with potential for extension

Rates : 525/day Inside IR 35

Key Responsibilities :

We are seeking a Senior Infrastructure/Automation Engineer for an exciting contract opportunity with a prominent banking client in Sheffield. This role is ideal for an experienced professional with a strong background in automation and infrastructure management.

Automation - playbook

AAP Infrastructure side - Automation

Ansible Automation Platform
Scripting Languages Python

This is a fantastic opportunity to work on cutting-edge automation initiatives within a leading banking environment.

Apply today to join a team that values innovation, expertise, and collaboration.

GCS is acting as an Employment Business in relation to this vacancy.

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My client who are are within the investment management industry are looking for a Desktop Support Analyst to join their team on a 3 month contract role

Required:

Ability to respond timely to end users and resolve issues.Above excellent customer service, high levels of communication and the ability to managing problems through to completion whilst keeping the end user updated.Excellent time management skills.Experience supporting Windows 10/11 EnvironmentsExcellent working knowledge of core Microsoft products; Word, Excel, PowerPoint, Outlook, Edge etcOffice 365 experience - User Account Management & TroubleshootingWorking knowledge of Windows Server, Microsoft Active Directory and its associated tools.Experience supporting remote access systems including MFA, Azure Virtual Desktops and Windows Terminal Servers and VPN ConnectivityDemonstrable commitment to quality, service and problem management.

Desirable:

Knowledge of Microsoft AzureKnowledge of AV systems, such as Crestron Cisco and Teams Meeting Rooms.Knowledge of Endpoint Manger (Intune), SCCM, Auto PilotKnowledge of the Private Equity industry is a nice-to-have but not essential as training will be provided.Knowledge and experience of ITIL advantageous

This is an urgent role. Inside ir35

Excellent day rate available

If you are interested please email cvs to [email protected]

GCS is acting as an Employment Business in relation to this vacancy.

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Azure Platform Engineer - Terraform / MLOps - Hybrid

Location: Hybrid (London / Remote - UK Based)
Start Date: ASAP
Duration: 6 months initial

Overview:

We are looking for a talented Azure Platform Engineer with solid data engineering and MLOps experience to join a forward-thinking data platform team. You will play a key role in building and optimising Azure-based infrastructure to support large-scale data and machine learning workloads.

This role sits at the intersection of DataOps, DevOps, and MLOps - ideal for engineers who thrive on automation, scalability, and cloud-native design.

Key Responsibilities:

Design, build, and maintain Azure data and ML platform infrastructureDevelop and manage CI/CD pipelines using Azure DevOps and TerraformAutomate provisioning and configuration of Azure resources (Data Factory, Synapse, Databricks, Key Vault, etc.)Implement MLOps best practices for model training, deployment, and monitoringCollaborate with Data Scientists, ML Engineers, and Platform teams to deliver robust, automated solutions

Essential Skills & Experience:

Azure Expertise:

Strong experience across Azure Data Services (ADF, Synapse, Databricks, Azure ML)Deep understanding of cloud networking, security, and governance

Infrastructure as Code (IaC):

Terraform - advanced use of modules, workspaces, and state managementAutomating resource deployment and scaling in enterprise Azure environments

MLOps / DataOps:

Azure ML, MLflow, or Databricks MLOps frameworksBuilding automated pipelines for model training and deploymentIntegration of CI/CD with data and ML workloads

Please send across an updated CV if this is of interest

GCS is acting as an Employment Business in relation to this vacancy.

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Role: Infrastructure Engineer (PKI) - DV Cleared
Duration: 6-month rolling
Rate: Up to £500/day Outside IR35
Location: UK Onsite

We are seeking a skilled Infrastructure Support Specialist to join our Customers IT Team. This role is key to ensuring the reliability, security, and compliance of our Public Key Infrastructure (PKI) services and related systems. You will provide expert support, manage critical certificates, maintain infrastructure, and enforce security policies.

Key Responsibilities include:

Deliver advanced 2nd and 3rd line support for PKI infrastructure, including root and issuing CAs, resolving issues related to certificate issuance, revocation, auto-enrolment, and chain validation.Respond to and manage incidents, service requests, and change tickets in line with SLA targets, ensuring timely and effective resolution.Configure, maintain, and support core systems such as AzureAD accounts, SSO applications, Microsoft Intune, and Microsoft Defender monitoring.Oversee CA operations, CRLs, OCSP responders, and backup CA keys; perform patching, updates, and maintain an up-to-date cryptographic inventory.Keep comprehensive PKI documentation, review audit logs, implement role-based access controls, and uphold revocation procedures and security best practices.

To find out more, please apply now or drop an email with a copy of your CV to [email protected]

GCS is acting as an Employment Business in relation to this vacancy.

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Global bank based in Canary Wharf.

Role - C# / WPF / WCF / Winform Developer

Duration - 6 months with likely extension

Rate - £415 p/d (inside IR35)

Location - Hybrid / Canary Wharf

Tech Stack

C#WPFWinformsSQLOracle

Tasks

Tasks range from understanding business requirements, designing application structures, business data analysis, programming WPF (Windows Presentation Foundation) applications in Visual C#.NET on both Oracle and SQL Server database, testing with users, implementation through Development, Quality Assurance (QA), Production and Disaster Recovery environments. Supporting users and writing operation documents including User Helps (manuals) will also be required.As well as application development, this role will also include all aspects of system constructions and support for existing programmes which are written as WinForms (C#.NET) applications. Also, applications written in other languages like MS VBA for Excel and Access, MS VB and MS Excel Macros will also be required.

Additional Tasks

Defining Database objects required in systems to connect with SQL and Oracle Database Administrators in both London and New York.Providing script for database inquiry languages, i.e., T-SQL (SQL Server) and PL/SQL (Oracle) to perform data analysis based on requirements from business parties.Setting up a system distribution method to Citrix and application servers for both Web and Window applications.Troubleshooting systems in an event of failure and implementing necessary solutions by checking Windows Operating System, Internet Information Server and any other relevant environments where the applications are running. In some case this role will act to liaise with other application support team staff.Following the existing team programming policy to keep a common development style to be shared in team members.Updating versions of MS .Net Framework and MS Visual .NET platform to include any necessary changes of existing systems running in Production.Liaising with the relevant support teams such as other Development sections, Technical Support, Network and Infrastructure and DBA where Business users experience system problems.Assessing the impact of data processing loads on SQL and Oracle database and, when appropriate, finding alternative approaches.Rolling out changes with a coordination of Release manager. It is important to maintain the change history of applications

GCS is acting as an Employment Business in relation to this vacancy.

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Role: Head of Planning and Operations

Type: Contract (Inside IR35)

Rate: GBP 450 per day

Nature: Remote (need to travel to client sites when required)

OverView of the role-

The candidate must have at least 10 years worth of leadership and management2-3 years in telecoms industry managing Infrastructure Engineers, Logistics stuffs and IT support engineers.Hands on with running a complete planning environment - contact centre / strategis planningKnowledge in Operation centres - NOCS centresThe role is more operational and tactical then strategic.Track performance of the project d- daily, in month performance and estimate whats happening in the next 6 months.Handled huge teams (indirect reporty of 100+)Keep track of the cost involved in running the process and able to minimize it to certain level.

GCS is acting as an Employment Business in relation to this vacancy.

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