Role DescriptionWe are seeking a highly skilled Senior Fullstack Developer with deep expertise in React and strong experience... Read more
Role Description
We are seeking a highly skilled Senior Fullstack Developer with deep expertise in React and strong experience deploying applications to cloud platforms, ideally Microsoft Azure (AWS experience also welcome). This role will focus on building, deploying, and optimising scalable, high-performance web applications that handle large volumes of data and integrate AI-driven components. You will work closely with backend engineers, cloud specialists, and AI teams to deliver intelligent, production- ready applications at scale.
Key Responsibilities
Design, build, and maintain scalable front-end applications using React, python and modern JavaScript/TypeScript.Build front-end solutions that support high data throughput, performance optimisation, and responsiveness at scale.Collaborate on the deployment of applications to cloud environments (Azure preferred; AWS acceptable).Integrate front-end applications with AI-powered services, including LLM-based APIs and workflows and Agentic AI systemsAutomation and orchestration services (particularly within Azure)Work with containerised environments (e.g. Docker) and contribute to cloud-native deployment pipelines.Support CI/CD processes and promote reliable, repeatable deployments.Required Skills / Experience
Extensive experience as a Senior fullstack Developer or similar role.Expert knowledge of React & Python, including modern patterns, hooks, state management, and performance optimisation.Proven experience deploying applications to cloud platforms, ideally Microsoft Azure.Experience integrating front-end applications with APIs, microservices, and distributed systems.Familiarity with container technologies such as Docker and container-based deployment models.Experience working on applications that handle large datasets or high-traffic environments.Strong understanding of front-end performance, observability, and optimisation techniques
GCS is acting as an Employment Business in relation to this vacancy.
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Full Stack Developer - Javascript/ React / Azure / Agentic AIWe are looking for an experienced Full Stack... Read more
We are looking for an experienced Full Stack Developer to join a technology-focused project, building modern, scalable applications with React, cloud technologies and Agentic AI.
Key Skills & ExperienceStrong commercial Full Stack Development experienceExpert-level React / React.js experienceProven experience deploying applications into Azure or other major cloud platformsExperience with Docker, Kubernetes or other container technologiesGood understanding of CI/CD pipelines and DevOps processesExperience building applications that process large datasets / high volumes of dataKnowledge or hands-on exposure to Agentic AI, AI Agents, LLMs or Generative AIStrong software engineering and application development fundamentalsThis is an excellent opportunity for a Full Stack Developer looking to work across React, cloud engineering and emerging Agentic AI technologies within a modern development environment.
Key skills: React, React.js, Full Stack, Azure, Cloud, Docker, Kubernetes, Containers, CI/CD, DevOps, Large Datasets, Agentic AI, AI Agents, LLM, Generative AI
GCS is acting as an Employment Business in relation to this vacancy.
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DevOps / SRE Engineer - GenAI / RAG / LLM PlatformContract | Hybrid/RemoteWe are looking for an experienced... Read more
Contract | Hybrid/Remote
We are looking for an experienced DevOps / Site Reliability Engineer (SRE) to build and operate production-grade infrastructure for Generative AI, RAG and LLM-based platforms.
This role sits at the intersection of DevOps/SRE, Kubernetes and AI engineering, with a strong focus on deploying, scaling, monitoring and supporting LLM workloads in production.
Key experienceStrong DevOps or SRE background supporting highly available production platforms.Hands-on Kubernetes experience, including deployment, scaling and production operations.Experience building or supporting RAG (Retrieval-Augmented Generation) architectures.Strong understanding of LLMs and production GenAI workloads.Vector database/search experience with Pinecone, Weaviate, pgvector or Azure AI Search.Experience with LangChain, LlamaIndex and/or MCP (Model Context Protocol).LLM observability/evaluation experience using LangSmith, Langfuse or Arize.Experience deploying or managing models through Hugging Face and/or AWS SageMaker.Strong understanding of CI/CD, infrastructure automation, monitoring, reliability and production troubleshooting.Ability to work closely with AI/ML and software engineering teams to take GenAI applications from development into reliable production environments.The roleYou'll help engineer the platform and operational foundations behind LLM and RAG applications, covering Kubernetes infrastructure, model deployment, vector search, observability, reliability and automated paths to production.
This would suit a DevOps/SRE Engineer who has moved into the GenAI/LLM space, rather than a traditional infrastructure engineer with no hands-on AI platform experience.
GCS is acting as an Employment Business in relation to this vacancy.
Read lessLondon, England, United KingdomContract
Contract Opportunity | Tier 1 Investment Bank | Canary WharfOverviewOur client, a Tier 1 Investment Bank based in... Read more
Our client, a Tier 1 Investment Bank based in Canary Wharf, is seeking an experienced C# Developer to join a strategic application modernisation programme. This role sits within a technology team responsible for evolving critical business applications, supporting a transition from legacy desktop solutions to modern web-based and cloud-enabled platforms.
The successful candidate will work across the full software development lifecycle, contributing to the enhancement of existing applications while helping shape the future-state architecture.
Key InformationRole: Senior C# Developer
Location: Canary Wharf, London (Hybrid Working)
Contract Length: 6 Months Initial Contract
Rate: £416 per day (Inside IR35)
Start Date: ASAP
This role forms part of a wider transformation initiative focused on:
Modernising legacy desktop applicationsMigrating technology platforms from on-premise infrastructure to AzureSupporting the transition from desktop-based solutions to web technologiesImproving application performance, maintainability and scalabilityDelivering new functionality aligned to business and regulatory requirementsThe successful contractor will work closely with development teams, business stakeholders and architecture functions to deliver high-quality software solutions within a complex enterprise environment.
Key ResponsibilitiesDevelop and maintain enterprise-grade applications using C#Enhance and support existing WPF and WinForms applicationsContribute to the migration of desktop applications towards web-based architecturesBuild and integrate APIs and backend servicesWrite efficient SQL queries and stored proceduresCollaborate with business analysts, architects and end users to understand requirementsParticipate in code reviews and promote development best practicesTroubleshoot production issues and contribute to continuous improvement initiativesSupport the adoption of Azure technologies as part of the broader cloud transformation strategyRequired Skills & ExperienceEssentialStrong commercial experience developing applications using C#/.NETProven expertise with WPF or WinformsStrong SQL or Oracle development skillsUnderstanding of software design principles and development best practicesExperience working within complex enterprise environmentsExperience working with AzureDesirableExperience with JavaScriptExposure to ReactExperience contributing to application modernisation programmesKnowledge of Azure cloud technologiesExperience within Financial Services, Investment Banking or Capital Markets environmentsPersonal AttributesStrong analytical and problem-solving skillsExcellent communication and stakeholder management abilitiesAbility to work independently in a fast-paced environmentCollaborative mindset and willingness to mentor junior developersComfortable balancing support of legacy systems alongside modernisation initiatives
GCS is acting as an Employment Business in relation to this vacancy.
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Solutions Architect - Tier 1 Bank - Canary Wharf Role - Application ArchitectDuration - 6 months with very... Read more
Solutions Architect - Tier 1 Bank - Canary Wharf
Role - Application Architect
Duration - 6 months with very likely extension
Location - Hybrid / Canary Wharf - 3 days per week in a Canary Wharf office
Rate - £600 per day (Inside IR35)
Experience -
In depth understanding of Object Orientated programming concepts as well as of the full Software Development Life Cycle.Good understanding of MS .NET Framework environments.Knowledge and experience of Agile methodologyKnowledge of Cloud and AI technologies that can be adopted into the workplaceExtensive experience working as a software and solutions architect.Experience in designing of high-level concepts for software solutions.Experience in development of Azure cloud-based as well as on-prem solutions.DevOps and SCRUM experienceExperience in Cloud migration planning and executionTasks -
Create and improve architectural standards for on premise and azure cloud software products, develop cloud migration procedures and guidelines.Assist in cloud migration projects, assess readiness and dependencies, optimize for the Cloud.Create and review blueprints for software products, provide guidance on improving architecture.Coding mission critical parts and performing code reviews.Assist on integrating AI technologies to improve existing systems.Ensure that applications are in line with compliance and regulatory standards and conduct regular security assessments of these applications.Technical writing (creating related documentation)Assist developers with any architecture related issues and queries.GCS is acting as an Employment Business in relation to this vacancy.
Read lessLondon, England, United KingdomContract
AI Copilot Developer - Power Apps - Power platform - Banking - Hybrid Role - AI Copilot DeveloperRate... Read more
AI Copilot Developer - Power Apps - Power platform - Banking - Hybrid
Role - AI Copilot Developer
Rate - £490 per day (Inside IR35)
Duration - 6 months with very likely extension
Location - Hybrid / Canary Wharf - 3 days per week in a Canary Wharf office
Tech Stack
CopilotPowerappsPower platformJavascriptRole
Development and support of low code Business applications using Power platform, M365, C#, JavaScript. You will collaborate closely with business analysts, business users and stakeholders to understand requirements, design innovative solutions, and bring them to life through development, testing, and deployment.Tasks
Design, develop, test, and deploy AI-powered solutions using Microsoft Copilot Studio, Power Platform, and Microsoft 365 technologies.Build and maintain intelligent agents, conversational AI experiences, and automated business processes.Integrate AI solutions with enterprise systems, including Dataverse, SharePoint, Power BI, Microsoft Fabric, SQL, and other business applications.Collaborate with business stakeholders to gather requirements, identify AI opportunities, and deliver innovative solutions that improve efficiency and user experience.Apply best practices for security, governance, compliance, and Responsible AI to ensure enterprise-grade solutions.Support solution architecture, documentation, testing, deployment, and ongoing maintenance activities.Contribute to continuous improvement by identifying opportunities to leverage AI, automation, and low-code technologies to enhance business processes and decision-making.Provide technical support, troubleshooting, and knowledge sharing across AI, Copilot, and Power Platform initiatives
GCS is acting as an Employment Business in relation to this vacancy.
Read lessLondon, England, United KingdomContract
Technical Writer - Software / Financial Services Role - Technical WriterRate - £416 per dayDuration - 6 months... Read more
Technical Writer - Software / Financial Services
Role - Technical Writer
Rate - £416 per day
Duration - 6 months with very likely extension
Location - Hybrid / Canary Wharf - 3 days per week in a Canary Wharf office
Technical Writer to join a London-based technology team operating within a complex financial services environment.
This is a hands-on role working closely with software developers, technical teams and business stakeholders to turn complex systems, processes and requirements into clear, structured and accessible documentation.
The Role
You'll work across the software development lifecycle, producing and maintaining documentation covering both technical and business-facing systems.
Key responsibilities will include:
Creating and maintaining technical and application documentation.Producing requirements and technical specifications, user guides, system documentation, support materials and internal procedures.Working closely with developers and business stakeholders to understand complex systems and translate technical information into clear documentation.Reviewing existing technical documentation and improving its accuracy, consistency and usability.Documenting application functionality, processes and system behaviour.Supporting documentation throughout the SDLC, including development, testing, release and ongoing support.Helping improve documentation standards and consistency across technology teams.Supporting knowledge-sharing sessions for developers and other stakeholders.Taking unclear or evolving requirements and turning them into structured, usable documentation.
What We're Looking For
You'll ideally have:
Proven experience as a Technical Writer within software development, IT or another technology-focused environment.Experience producing technical specifications, requirements documentation, user guides and process documentation.Strong understanding of software development concepts and the SDLC.The ability to understand complex software functionality and explain it clearly to different audiences.Experience working directly with software developers and business stakeholders.Strong analytical skills and attention to detail.Excellent written and verbal communication skills.Strong knowledge of Microsoft Word, Excel, PowerPoint and Visio.
Nice to Have
Experience or knowledge in any of the following would be particularly useful:
Financial services or banking technologyC# / .NETMicrosoft SQL ServerAgile software developmentAzure DevOpsJiraSharePointGCS is acting as an Employment Business in relation to this vacancy.
Read lessLondon, England, United KingdomContract
Project OverviewWe are looking for an experienced Quality Assurance Automation Engineer to support a major technology programme involving... Read more
We are looking for an experienced Quality Assurance Automation Engineer to support a major technology programme involving Microsoft Dynamics 365 Finance & Operations (D365 F&O). The role will focus on ensuring the quality, reliability and integration of financial systems and business processes.
Key ResponsibilitiesPerform functional, integration, end-to-end and automation testing across enterprise systems.
Test D365 Finance & Operations, particularly Purchase-to-Pay (P2P) processes, including purchase orders, invoices, payments and reconciliation.
Conduct API testing using Postman and validate data flows between multiple systems.
Manage test cases, defects and requirements traceability using Azure DevOps Test Plans.
Review and challenge supplier testing, identifying gaps and quality risks.
Coordinate UAT, regression testing, defect resolution and production readiness assessments.
Prepare test strategies, evidence and release quality reports.
Essential Skills & ExperienceStrong experience in Quality Assurance and Test Automation.
Hands-on experience with Microsoft Dynamics 365 Finance & Operations, ideally D365 Finance.
Experience testing financial processes, particularly Procure-to-Pay (P2P).
Strong integration and end-to-end testing experience.
API testing experience using Postman.
Experience with Azure DevOps Test Plans and defect management.
Knowledge of data validation, reconciliation and enterprise system integrations.
Ability to independently assess testing quality and identify release risks.
GCS is acting as an Employment Business in relation to this vacancy.
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AI ArchitectLondon (Hybrid) | Contract | Strong Day Rate | Inside IR35We're supporting a leading organisation undergoing a... Read more
London (Hybrid) | Contract | Strong Day Rate | Inside IR35
We're supporting a leading organisation undergoing a significant AI transformation and are looking for an experienced AI Architect to define, govern and scale enterprise AI capabilities across the business.
This is a senior architecture role focused on establishing the foundations, standards and target architecture for AI adoption. You'll work across business and technology teams to design secure, scalable and governed AI solutions while helping shape the organisation's long-term AI strategy.
Key ResponsibilitiesDefine and own enterprise AI architecture principles, standards and roadmaps.Design scalable AI platforms leveraging Azure AI services and modern AI architecture patterns.Lead the adoption of Agentic AI and AI-powered automation capabilities across the organisation.Establish AI governance, security controls, risk management frameworks and architectural guardrails.Work closely with business stakeholders to identify and prioritise AI use cases and opportunities.Create reference architectures, design patterns and best practices for AI implementation.Provide architectural leadership across multiple AI initiatives and delivery teams.Ensure solutions align with wider enterprise architecture, security and regulatory requirements.Act as the senior technical authority for AI-related architecture decisions.Required ExperienceProven experience operating as an AI Architect, Enterprise Architect or Lead Architect within large organisations.Strong understanding of Generative AI, LLMs, AI Agents and Agentic AI architectures.Experience designing enterprise-scale AI platforms and operating models.Azure AI experience, including Azure OpenAI and Azure AI Foundry.Strong understanding of AI governance, security, compliance and responsible AI practices.Experience defining architecture standards, principles and target-state architectures.Ability to engage and influence senior stakeholders across technology and business functions.Experience working within complex, regulated enterprise environments.Desirable ExperienceAI Centre of Excellence (CoE) design and implementation.Retrieval-Augmented Generation (RAG) architectures.Multi-agent systems and orchestration frameworks.Data platform architecture and modern cloud-native solutions.Experience within utilities, energy, financial services or other regulated sectors.What's on OfferStrong day rate.Inside IR35 contract.Hybrid working with London-based stakeholder engagement.Opportunity to shape and influence enterprise AI strategy at scale.Immediate interview process.To discuss the opportunity in confidence, please apply with an up-to-date CV.
GCS is acting as an Employment Business in relation to this vacancy.
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Senior Project Manager - Finance TransformationLocation: London (Hybrid - 2-3 days per week in the office)Contract: 12 months... Read more
Senior Project Manager - Finance Transformation
Location: London (Hybrid - 2-3 days per week in the office)
Contract: 12 months initially, with potential an extension
The Opportunity
We are seeking an experienced Senior Project Manager / Transformation Lead to provide senior delivery leadership within a major global payroll transformation programme for a leading international organisation.
The programme involves consolidating payroll operations across 35 countries into a single global cloud-based payroll solution, alongside transitioning locally managed payroll support into a centralised Shared Services model.
With the first wave of countries entering parallel run, the organisation is looking for an experienced individual to work closely with senior Finance and Shared Services sponsors, providing leadership, coordination and delivery oversight across the programme.
This is a senior position requiring someone who can operate confidently at executive level while remaining hands-on and closely involved in delivery.
Key Responsibilities
Provide leadership and delivery oversight across the global payroll transformation programme.Work closely with senior executive sponsors across Finance and Shared Services, ensuring alignment on priorities and key decisions.Lead programme governance, including 30, 60 and 90-day reviews, reporting and forward planning.Oversee global payroll consolidation, implementation, parallel runs, testing, cutover and stabilisation.Drive the transition from local payroll operations to a centralised Shared Services model.Manage programme risks, issues, dependencies, budgets and delivery milestones.Coordinate globally distributed teams across the UK, North America and Asia-Pacific.Manage third-party implementation partners and commercial commitments.Oversee dependencies with the wider PeopleFusion HCM programme, particularly employee data and system integrations.Identify delivery challenges and proactively develop practical solutions.
Essential Experience & Skills
Around 15+ years' experience managing complex transformation projects, programmes or portfolios, with strong hands-on delivery experience.Proven experience in finance transformation, global payroll transformation or large-scale enterprise systems implementations.Experience delivering complex, multi-country transformation programmes.Strong understanding of global systems implementation, integration, testing, cutover and transition.Excellent senior stakeholder management and influencing skills, including engagement with executive sponsors and senior Finance leaders.Experience managing programme governance, budgets, risks, dependencies and commercial matters.Proven ability to lead globally distributed teams and manage external implementation partners.Strong communication, leadership and problem-solving skills.
Desirable Experience
Global payroll systems and transformation programmes.ERP implementations such as SAP, Oracle, Workday or similar.Finance operating model transformation and Shared Services transitions.HR / HCM transformation and system integrations.Knowledge of payroll and wider finance processes.PRINCE2, APM, PMI or MSP qualifications.
GCS is acting as an Employment Business in relation to this vacancy.
Read lessLondon, England, United KingdomContract
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