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Global bank based in Canary Wharf.

Role - C# Developer - Desktop Applications

Duration - 6 months with likely extension

Rate - £416 p/d (inside IR35)

Location - Hybrid / Canary Wharf

Tech Stack

C#WPFWinformsJavascriptSQLOracle

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 Title: .Net IAM Developer

Location: Sheffield (Hybrid - 2-3 days per week onsite)

Role Category: Inside IR35

Contract Duration: Until 30th November with extension

Overview

We're recruiting for an experienced .Net IAM Developer to join the Identity & Access Management team of a leading global financial services organisation.

This role offers the opportunity to work on enterprise-scale identity solutions, developing secure integrations and supporting identity lifecycle management across a complex technology estate.

Responsibilities

Develop enterprise IAM solutions using .NET Core, ASP.NET and C#.Build and support integrations with SailPoint IdentityNow.Develop custom connectors and REST API integrations.Configure integrations with Active Directory, Microsoft SQL and Web Services.Support identity lifecycle processes including Joiner, Mover and Leaver.Implement and support Role-Based Access Control (RBAC).Investigate and resolve provisioning and access-related issues.Work closely with business stakeholders, infrastructure teams and third-party suppliers.Produce technical documentation and knowledge transfer materials.Support CI/CD automation using Jenkins, GitHub and Ansible.Contribute to cloud-based IAM solutions within Azure and AWS environments.

Required Skills

5+ years' experience in enterprise software development.Strong experience with .NET Core, ASP.NET and C#.Microsoft SQL Server.REST API development and enterprise integrations.Experience integrating with Active Directory.Experience with SailPoint IdentityNow or another enterprise IAM platform.Knowledge of Identity Lifecycle Management, Access Provisioning and RBAC.Experience using Jenkins, GitHub and Ansible.Azure and/or AWS exposure.Excellent troubleshooting and communication skills.

Desirable Skills

SailPoint IdentityNow custom connector development.CyberArk, HashiCorp or Centrify.Angular.Docker and Kubernetes.QA and automated testing.JIRA and Confluence.

This is an excellent opportunity to join a high-performing engineering team delivering secure, enterprise-scale Identity & Access Management solutions using modern .NET technologies, cloud platforms and automation practices.

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

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C# Developer Role - Hybrid / Liverpool street - 6 month Contract - Banking

Role - C# Developer (T/SQL, PL/SQL)

Duration - 6 months with very likely extension

Location - Hybrid / Liverpool Street (London) - 3 days per week in a Liverpool Street office

Rate - £690 per day (Inside IR35)

Tech Stack

C#SQLOracle

Tasks

Tasks include understanding business requirements, designing applications, business data analysis, programming in Visual C#.NET using both Oracle and SQL Server database, Unit testing, Quality Assurance (QA), Implementation, Production and Disaster Recovery environments supporting users and preparing documents.Along with the application development, this role will also include supporting the existing C# and .NET applications. General IT Support to maintain environmentDefining database objects required in the systems. Interactions with the SQL and Oracle Database Administrators in both London and New York.Providing script for database enquiry languages, i.e., T-SQL (SQL Server) and PL/SQL (Oracle) so that data analysis can be performed based on requirements from relevant business parties.Support setting up a system distribution method for Citrix and application servers for both Web and Window applications.Troubleshooting systems in the event of failure and implementing solutions (Code fix, SQL scripting etc), including checking Windows Servers, Databases (SQL Server or Oracle) and any other relevant environments where the system is running. In some cases, this will involve liaising with other application support team staff across London and New York offices.Following the development teams' programming policy and procedures to maintain common programming practice.Updating versions of MS .Net Framework and MS Visual .NET platform to include any necessary changes of the existing systems running in Production environment.`Liaising with the relevant support teams such as other Development team sections, Technical Support, Network and Infrastructure and DBAs whenever Business users experience system problems.Assessing the impact of data processing loads on SQL and Oracle databases and when appropriate, finding alternative solutions.Actively assisting rolling out changes through coordination with the Release team. It is also very important to maintain the change history of the applications.Communicating with primary support Helpdesk staff in London and New York to provide the necessary system supports.

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

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C# Developer Role - Hybrid / Liverpool street - 6 month Contract - Banking

Role - C# Developer (T/SQL, PL/SQL)

Duration - 6 months with very likely extension

Location - Hybrid / Liverpool Street (London) - 3 days per week in a Liverpool Street office

Rate - £690 per day (Inside IR35)

Tech Stack

C#SQLOracle

Tasks

Tasks include understanding business requirements, designing applications, business data analysis, programming in Visual C#.NET using both Oracle and SQL Server database, Unit testing, Quality Assurance (QA), Implementation, Production and Disaster Recovery environments supporting users and preparing documents.Along with the application development, this role will also include supporting the existing C# and .NET applications. General IT Support to maintain environmentDefining database objects required in the systems. Interactions with the SQL and Oracle Database Administrators in both London and New York.Providing script for database enquiry languages, i.e., T-SQL (SQL Server) and PL/SQL (Oracle) so that data analysis can be performed based on requirements from relevant business parties.Support setting up a system distribution method for Citrix and application servers for both Web and Window applications.Troubleshooting systems in the event of failure and implementing solutions (Code fix, SQL scripting etc), including checking Windows Servers, Databases (SQL Server or Oracle) and any other relevant environments where the system is running. In some cases, this will involve liaising with other application support team staff across London and New York offices.Following the development teams' programming policy and procedures to maintain common programming practice.Updating versions of MS .Net Framework and MS Visual .NET platform to include any necessary changes of the existing systems running in Production environment.`Liaising with the relevant support teams such as other Development team sections, Technical Support, Network and Infrastructure and DBAs whenever Business users experience system problems.Assessing the impact of data processing loads on SQL and Oracle databases and when appropriate, finding alternative solutions.Actively assisting rolling out changes through coordination with the Release team. It is also very important to maintain the change history of the applications.Communicating with primary support Helpdesk staff in London and New York to provide the necessary system supports.

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

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C# Developer Role - Hybrid / Liverpool street - 6 month Contract - Banking

Role - C# Developer (T/SQL, PL/SQL)

Duration - 6 months with very likely extension

Location - Hybrid / Liverpool Street (London) - 3 days per week in a Liverpool Street office

Rate - £690 per day (Inside IR35)

Tech Stack

C#SQLOracle

Tasks

Tasks include understanding business requirements, designing applications, business data analysis, programming in Visual C#.NET using both Oracle and SQL Server database, Unit testing, Quality Assurance (QA), Implementation, Production and Disaster Recovery environments supporting users and preparing documents.Along with the application development, this role will also include supporting the existing C# and .NET applications. General IT Support to maintain environmentDefining database objects required in the systems. Interactions with the SQL and Oracle Database Administrators in both London and New York.Providing script for database enquiry languages, i.e., T-SQL (SQL Server) and PL/SQL (Oracle) so that data analysis can be performed based on requirements from relevant business parties.Support setting up a system distribution method for Citrix and application servers for both Web and Window applications.Troubleshooting systems in the event of failure and implementing solutions (Code fix, SQL scripting etc), including checking Windows Servers, Databases (SQL Server or Oracle) and any other relevant environments where the system is running. In some cases, this will involve liaising with other application support team staff across London and New York offices.Following the development teams' programming policy and procedures to maintain common programming practice.Updating versions of MS .Net Framework and MS Visual .NET platform to include any necessary changes of the existing systems running in Production environment.`Liaising with the relevant support teams such as other Development team sections, Technical Support, Network and Infrastructure and DBAs whenever Business users experience system problems.Assessing the impact of data processing loads on SQL and Oracle databases and when appropriate, finding alternative solutions.Actively assisting rolling out changes through coordination with the Release team. It is also very important to maintain the change history of the applications.Communicating with primary support Helpdesk staff in London and New York to provide the necessary system supports.

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

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Global bank based in Canary Wharf.

Role - C# Developer - Desktop Applications

Duration - 6 months with likely extension

Rate - £490 p/d (inside IR35)

Location - Hybrid / Canary Wharf

Tech Stack

C#WPFWinformsJavascriptSQLOracle

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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SharePoint/ Office 365 Consultant - Hybrid / Canary Wharf - 6 month Contract - Banking

TIER 1 BANK IN CANARY WHARF

Role - SharePoint/ Office 365 Consultant

Duration - 6 months with very likely extension

Location - Hybrid / Canary Wharf - 3 days per week in a Canary Wharf office

Rate - £490 per day (Inside IR35)

Tech Stack -

SharepointOffice 365Power appsPower AutomateHTML, Javascript, CSS

Tasks -

Working with the team and the wider development team to both grow and to help adopt Agile like methodologies with practical implementation alongside the daily operation support people for existing SharePoint/Office 365 applications.Working with the wider Development and Architecture teams to develop and establish best practices of SharePoint/Office 365.Contributing to and regularly leading the technical and design workshops within the team.Critically and actively conducting code review procedures to ensure improvement in skills across the team.Participating in exercises to both plan and estimate upcoming work volumes.Contributing to the rollout of new tools and applications that will improve the development processes.Enhancing performance, scalability and security issues across the design and implementation phases.Following "Change Management Control procedures" to get approvals for any updates in the Production systems and providing "Maintenance reports" for non-Production environments.Participating in both definition and configuration of SharePoint/Office 365 environments in the Disaster Recovery sites.Encouraging and supporting the continuous improvement and upskilling of all members in the team, as well as the wider development departmentDevelopment of Office 365 tools including SharePoint Online (PowerApps, Power Automate and SPFX or ReactJS).Analysing of business requirements and providing constructive feedback.Creating documentation to detail deliverables by the relevant teams with enough depth for both technical and business viewpoints.Providing scripts for database enquiry languages, i.e., T-SQL (SQL Server) and PL/SQL (Oracle) to provide both analysis and exporting data etc. based on business requirements.

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

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C# Developer Role - Hybrid / Liverpool street - 6 month Contract - Banking

Role - C# Developer (T/SQL, PL/SQL)

Duration - 6 months with very likely extension

Location - Hybrid / Liverpool Street (London) - 3 days per week in a Liverpool Street office

Rate - £690 per day (Inside IR35)

Tech Stack

C#SQLOracle

Tasks

Tasks include understanding business requirements, designing applications, business data analysis, programming in Visual C#.NET using both Oracle and SQL Server database, Unit testing, Quality Assurance (QA), Implementation, Production and Disaster Recovery environments supporting users and preparing documents.Along with the application development, this role will also include supporting the existing C# and .NET applications. General IT Support to maintain environmentDefining database objects required in the systems. Interactions with the SQL and Oracle Database Administrators in both London and New York.Providing script for database enquiry languages, i.e., T-SQL (SQL Server) and PL/SQL (Oracle) so that data analysis can be performed based on requirements from relevant business parties.Support setting up a system distribution method for Citrix and application servers for both Web and Window applications.Troubleshooting systems in the event of failure and implementing solutions (Code fix, SQL scripting etc), including checking Windows Servers, Databases (SQL Server or Oracle) and any other relevant environments where the system is running. In some cases, this will involve liaising with other application support team staff across London and New York offices.Following the development teams' programming policy and procedures to maintain common programming practice.Updating versions of MS .Net Framework and MS Visual .NET platform to include any necessary changes of the existing systems running in Production environment.`Liaising with the relevant support teams such as other Development team sections, Technical Support, Network and Infrastructure and DBAs whenever Business users experience system problems.Assessing the impact of data processing loads on SQL and Oracle databases and when appropriate, finding alternative solutions.Actively assisting rolling out changes through coordination with the Release team. It is also very important to maintain the change history of the applications.Communicating with primary support Helpdesk staff in London and New York to provide the necessary system supports.

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

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Location : Sheffield / London (2/3 days a week in office)

Role Overview

A hands-on Technical Lead to establish and grow a new sitecore development capability from the ground up. This is a foundational role within a newly formed DevOps POD merging into an existing team, requiring someone who leads by technical example, builds team culture, and delivers high-quality Sitecore solutions across backend and frontend.

Key Responsibilities

Provide technical leadership across a cross-functional Sitecore development team, including engineers based in India, Poland and China.Actively contribute to and review pull requests; maintain code quality and architectural standardsUnblock engineers and provide clear, pragmatic technical direction day-to-dayDrive Agile ceremonies - sprint planning, reviews, retrospectives - and embed engineering best practicesEngage directly with business stakeholders to translate requirements into sound technical solutionsDefine and evolve the team's development standards.Support hiring and onboarding of backend and frontend developers as the team scales

Required Skills & Experience

Strong hands-on Sitecore experience (XM/XP/XM Cloud)Proficiency with Sitecore's architecture, content modelling, and multisite configurationsExperience with Sitecore headless delivery (JSS, Experience Edge) desirable.C# / .NET development (ASP.NET Core)RESTful API design and integration patternsSitecore Helix architecture principlesExperience with Azure or other cloud hosting environments is a plus.Working knowledge of modern JavaScript frameworks (React, Next.js preferred)Ability to review frontend code critically and guide frontend engineers effectivelyGit-based workflows, branching strategies, and agile cultureFamiliarity with unit testing, integration testing, and automation testing approachesAbility to instil QA discipline within a development teamProven experience leading a high-performing development team in a hands-on capacityStrong communicator across technical and non-technical audiencesStructured, pragmatic approach to Agile delivery

Nice to Have

Sitecore certification(s)Experience building or rebuilding a team/capability from scratchFamiliarity with Sitecore CDP, Personalize, or Search

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

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Job Title: Senior .NET/JavaScript Full Stack Developer
Location: Limerick (Hybrid 2 days flexible)
Type: 6 Months contract (with possible extension)

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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