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.
Read lessLondon, England, United KingdomContract
We're looking for a Senior Full Stack Developer to join a cutting-edge AI programme building next-generation Agentic AI... Read more
We're looking for a Senior Full Stack Developer to join a cutting-edge AI programme building next-generation Agentic AI solutions on Microsoft Azure.
Essential SkillsStrong React and TypeScript development experienceBackend development with PythonExperience deploying applications to Azure (AWS also considered)API & Micro services integrationDocker and containerised environmentsCI/CD and cloud-native developmentExperience working with AI/LLM technologies, OpenAI, Azure OpenAI, Lang Chain, Semantic Kernel, RAG, or Agentic AI frameworksWhat You'll Be DoingBuilding scalable, high-performance web applicationsDeveloping AI-powered solutions and user experiencesDeploying and optimising applications on AzureWorking closely with Cloud, AI, and Engineering teamsDriving technical design and delivery within a greenfield programme
GCS is acting as an Employment Business in relation to this vacancy.
Read lessLondon, England, United KingdomContract
Senior Full Stack Developer (React, Python & Azure AI)Location: London/ Hybrid Start: ASAPAbout the OpportunityWe are seeking an... Read more
Location: London/ Hybrid
Start: ASAP
We are seeking an experienced Senior Full Stack Developer to join a cutting-edge programme focused on delivering AI-powered solutions on Microsoft Azure.
This initial workstream is dedicated to building an Agentic AI capability using Python and Azure technologies, working closely with business stakeholders to define the technical foundation, architecture, and product direction for a wider enterprise AI programme.
This is an exciting opportunity to work on innovative AI initiatives, cloud-native applications, and large-scale data-driven solutions while helping shape future platform capabilities.
The RoleAs a Senior Full Stack Developer, you will play a key role in designing, developing, and deploying modern web applications that integrate with AI-powered services and large-scale distributed systems.
You will collaborate with cloud engineers, architects, data specialists, and AI teams to deliver scalable, secure, and high-performing solutions in Azure environments.
Key ResponsibilitiesDesign, develop, and maintain scalable full-stack applications using React, Python, JavaScript, and TypeScriptBuild responsive, high-performance front-end solutions capable of handling large data volumesDevelop and integrate APIs, microservices, and distributed systemsDeploy and manage applications within Microsoft Azure environmentsIntegrate applications with LLM-based services, Agentic AI workflows, and AI-driven platformsWork with containerised solutions using Docker and cloud-native deployment approachesSupport and enhance CI/CD pipelines to ensure reliable and repeatable deploymentsCollaborate closely with architecture, cloud, and AI teams to deliver production-ready solutionsDrive performance optimisation, observability, scalability, and application reliabilityRequired Skills & ExperienceEssentialExtensive experience as a Senior Full Stack DeveloperStrong expertise in:ReactJavaScript / TypeScriptPythonDeep understanding of modern React development:HooksState managementComponent architecturePerformance optimisationProven experience deploying applications to cloud environments, ideally Microsoft AzureStrong experience integrating APIs, microservices, and distributed architecturesHands-on experience with Docker and containerised deploymentsExperience building applications that support high traffic volumes and large datasetsStrong understanding of frontend performance, monitoring, and observabilityExperience working within Agile delivery teamsDesirableAzure AI ServicesAzure OpenAIAgentic AI frameworksAzure Container AppsAzure Kubernetes Service (AKS)Infrastructure as CodeExperience with AWS cloud platformsExposure to enterprise-scale AI transformation programmesWhat You'll Be Working OnAI-powered enterprise applicationsAgentic AI and intelligent workflow solutionsAzure cloud-native platformsLarge-scale data processing and visualisation solutionsProduction-grade deployment pipelinesModern React front-end architecturesIdeal CandidateYou are a hands-on Senior Engineer who enjoys solving complex technical challenges and building products that deliver real business value. You have strong cloud deployment experience, enjoy working with modern web technologies, and are excited by the opportunity to work at the forefront of AI and Azure innovation.
Interested?If you have strong experience with React, Python, Azure cloud technologies, AI integrations, and modern full-stack development, we'd love to hear from you. Apply now to be part of a pioneering AI programme shaping the future of enterprise solutions.
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.
Read lessLondon, England, United KingdomContract
Hiring AlertSenior Quicksight DeveloperWe are looking for a Senior Quicksight Developer with strong data modeling experience, and owning... Read more
Hiring Alert
Senior Quicksight Developer
We are looking for a Senior Quicksight Developer with strong data modeling experience, and owning and rebuilding the manufacturing reporting layer, ensuring accurate, trusted, and automated operational reporting. The ideal candidate will work closely with operations, software engineering, and data engineering teams to validate business metrics, redesign datasets, and deliver scalable QuickSight dashboards.
Key Responsibilities
Strong data modeling experience, including designing fact and dimension schemas from business requirements and creating intuitive data models for business users.Designing the data model. Identify a sensible, simple model (fact and dimension tables) that would yield those dashboardsAssess existing QuickSight dashboards, Athena/Redshift datasets, and reporting workflows.Analyze and resolve data quality and reporting discrepancies.Validate KPIs and business metrics with operations stakeholders.Rebuild and optimize the reporting layer from source tables through dashboards.Develop and automate WBR/MBR dashboards using Amazon QuickSight.Work with AWS data platforms including Athena, Redshift, S3, Glue, and PySpark.Implement reporting logic for calendars, shifts, utilization, throughput, cycle times, on-time delivery, yield, and backlog metrics.Create self-service datasets, templates, and documentation for business users.Support future analytics, data, and automation initiatives.Required Skills
10 years of experience in BI, Analytics Engineering, or Data Engineering.Experience owning the reporting layer end-to-end, from source data through dashboards.Strong SQL expertise, including complex joins, window functions, and performance tuning.Hands-on experience with Amazon QuickSight (SPICE, calculated fields, row-level security, dashboards).Strong AWS experience with Athena, Redshift, S3, Glue, and PySpark.Python/PySpark experience for data validation, profiling, and transformation.Experience working with operational, manufacturing, supply chain, logistics, or production data.Preferred Skills
Manufacturing, MES, ERP, or shop-floor analytics experience.Experience supporting WBR/MBR reporting and KPI frameworks.Knowledge of operational metrics such as utilization, throughput, downtime, cycle time, yield, and on-time delivery.
GCS is acting as an Employment Business in relation to this vacancy.
Read lessDallas, Texas, United States of AmericaContractRemote
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.
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.
Read lessLondon, England, United KingdomContract
Job SummaryWe are seeking an experienced Senior Application Developer / Systems Analyst to design, develop, implement, and support... Read more
We are seeking an experienced Senior Application Developer / Systems Analyst to design, develop, implement, and support enterprise applications. The ideal candidate will work closely with business stakeholders and technical teams to deliver scalable, high-quality solutions aligned with business goals and architectural standards.
Key ResponsibilitiesGather and analyze business and technical requirements.Design, develop, test, deploy, and support application solutions.Participate in all phases of the Software Development Life Cycle (SDLC).Develop high-quality, reusable, and maintainable code.Recommend new development approaches and code reuse opportunities.Contribute to application, component, and data architecture design.Monitor application performance and resolve production issues.Support system integrations, product evaluations, and build-vs-buy assessments.Ensure timely delivery of solutions that meet quality standards.QualificationsBachelor's degree in Computer Science, Information Systems, or a related field (or equivalent experience).10+ years of experience in software development and systems analysis.Strong knowledge of application development, system integration, and SDLC methodologies.Experience with application design, testing, implementation, and production support.Excellent analytical, problem-solving, and communication skills.
GCS is acting as an Employment Business in relation to this vacancy.
Read lessNew York City, New York, United States of AmericaContractRemote
Job SummaryWe are seeking an experienced Senior Application Developer / Systems Analyst to design, develop, implement, and support... Read more
We are seeking an experienced Senior Application Developer / Systems Analyst to design, develop, implement, and support enterprise applications. The ideal candidate will work closely with business stakeholders and technical teams to deliver scalable, high-quality solutions aligned with business goals and architectural standards.
Key ResponsibilitiesGather and analyze business and technical requirements.Design, develop, test, deploy, and support application solutions.Participate in all phases of the Software Development Life Cycle (SDLC).Develop high-quality, reusable, and maintainable code.Recommend new development approaches and code reuse opportunities.Contribute to application, component, and data architecture design.Monitor application performance and resolve production issues.Support system integrations, product evaluations, and build-vs-buy assessments.Ensure timely delivery of solutions that meet quality standards.QualificationsBachelor's degree in Computer Science, Information Systems, or a related field (or equivalent experience).10+ years of experience in software development and systems analysis.Strong knowledge of application development, system integration, and SDLC methodologies.Experience with application design, testing, implementation, and production support.Excellent analytical, problem-solving, and communication skills.
GCS is acting as an Employment Business in relation to this vacancy.
Read lessSeattle, Washington, United States of AmericaContractRemote
Job SummaryWe are seeking an experienced Senior Application Developer / Systems Analyst to design, develop, implement, and support... Read more
Job Summary
We are seeking an experienced Senior Application Developer / Systems Analyst to design, develop, implement, and support enterprise applications. The ideal candidate will work closely with business stakeholders and technical teams to deliver scalable, high-quality solutions aligned with business goals and architectural standards.
Key ResponsibilitiesGather and analyze business and technical requirements.Design, develop, test, deploy, and support application solutions.Participate in all phases of the Software Development Life Cycle (SDLC).Develop high-quality, reusable, and maintainable code.Recommend new development approaches and code reuse opportunities.Contribute to application, component, and data architecture design.Monitor application performance and resolve production issues.Support system integrations, product evaluations, and build-vs-buy assessments.Ensure timely delivery of solutions that meet quality standards.QualificationsBachelor's degree in Computer Science, Information Systems, or a related field (or equivalent experience).10+ years of experience in software development and systems analysis.Strong knowledge of application development, system integration, and SDLC methodologies.Experience with application design, testing, implementation, and production support.Excellent analytical, problem-solving, and communication skills.
GCS is acting as an Employment Business in relation to this vacancy.
Read lessCamden, New Jersey, United States of AmericaContract
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