Full Stack Engineer- AI/ ML- Full remote

Added 03/08/2025

Full Stack Engineer - AI/ MLFully remoteOverview GCS are working with a pioneering AI/ML product company, now seeking a Contract Full Stack Engineer to accelerate development on a next-gen AI-powered platform. You'll help build customer-facing tools that make data consumption seamless through chat interfaces, GenAI, and intelligent assistants - all running on a robust Azure cloud environment.As a Full Stack Engineer you wil be working with product and research teams to integrate advanced models (including ArgenticAI and Azure OpenAI) directly into user experiences.Tech Stack & Tools:Frontend: TypeScriptBackend: Node.jsAI/ML Integration: Azure OpenAI, ArgenticAI, RESTful APIs to LLM backendsCloud: Microsoft Azure (App...

GenAI Full Stack Engineer - RAG- LLM - Remote contract

Added 23/09/2025

Full Stack Engineer - GenAI Specialist LLMs | Python | RAG | ContractLocation: UK / Remote Contract Length: 6 months Start Date: ASAP We are working with an innovative enterprise client on a cutting-edge GenAI platform, and they are seeking a Full Stack GenAI Specialist with strong expertise in LLMs, prompt engineering, and AI-powered automation.You'll play a central role in building AI agents and primitives that drive automated code modernisation, delivering value across the full AI lifecycle - from model training pipelines to production-ready full-stack systems.This is a contract opportunity to work on highly advanced AI use cases using the...

Full Stack Engineer- AI/ ML- Fully remote

Added 01/09/2025

Full Stack Engineer - AI/ MLFully remoteOverview GCS are working with a pioneering AI/ML product company, now seeking a Contract Full Stack Engineer to accelerate development on a next-gen AI-powered platform. You'll help build customer-facing tools that make data consumption seamless through chat interfaces, GenAI, and intelligent assistants - all running on a robust Azure cloud environment.As a Full Stack Engineer you will be working with product and research teams to integrate advanced models (including AgenticAI and Azure OpenAI) directly into user experiences.Tech Stack & Tools:Frontend: TypeScriptBackend: Node.jsAI/ML Integration: Azure OpenAI, AgenticAI, RESTful APIs to LLM backendsCloud: Microsoft Azure (App...

Full Stack Engineer- AI/ ML- Fully remote

Added 01/09/2025

Full Stack Engineer - AI/ MLFully remoteOverview GCS are working with a pioneering AI/ML product company, now seeking a Contract Full Stack Engineer to accelerate development on a next-gen AI-powered platform. You'll help build customer-facing tools that make data consumption seamless through chat interfaces, GenAI, and intelligent assistants - all running on a robust Azure cloud environment.As a Full Stack Engineer you will be working with product and research teams to integrate advanced models (including AgenticAI and Azure OpenAI) directly into user experiences.Tech Stack & Tools:Frontend: TypeScriptBackend: Node.jsAI/ML Integration: Azure OpenAI, AgenticAI, RESTful APIs to LLM backendsCloud: Microsoft Azure (App...

Senior C# .Net Developer (Legacy Migration) - Remote

Added 22/09/2025

For our client who is a leading global information services company, providing data and analytical tools to our clients around the world. we are looking for below hiring . JOB DESCRIPTION:Role : Senior C# .NET Developer (Oracle to PostgreSQL Migration Project)Duration : 6 months extendableLocation : Nottingham ( Fully Remote )Rates : £500 - 520 per day Inside IR35Overview:About the ProjectWe are undertaking a strategic transformation of a legacy system built on PHP and Oracle, migrating to a modern architecture using PostgreSQL and .NET (C#).* 5+ years of experience in .NET/C# development, with a strong focus on backend services and...

Senior .NET/C# Developer

Added 07/07/2025

Role: Sr Developer C# .Net DeveloperType: Contract (Inside IR35)Nature: Hybrid (1 day per week in Nottingham) Overview of the role- Required Skills & Experience5+ years of experience in .NET/C# development, with a strong focus on backend services and data access layers.Proven experience in migrating legacy systems, especially from Oracle to PostgreSQL or similar.Strong understanding of PL/SQL and experience translating stored procedures into application logic.Familiarity with PostgreSQL, including performance tuning and SQL dialect differences.Experience working in hybrid environments where legacy and modern systems coexist.Comfortable using AI tools (e.g., GitHub Copilot, ChatGPT, code translators) to assist in development and migration tasks.Solid understanding...

Senior Oracle Developer (C#/.NET)

Added 07/07/2025

Hi,We are hiring for below:JOB DESCRIPTION: 🚀 Now Hiring: Role: Senior Oracle Developer - Oracle to .NET (C#) Migration ProjectType: Contract Inside IR35 Location : Nottingham[ 1 day in office / week - Hybrid ]Rate : £500 - 560 p/d Inside IR35 Job DescriptionRequired Skills & Experience5+ years of experience developing in Oracle PL/SQL, including deep knowledge of stored procedures, triggers, and packages.Proven experience in migrating business logic from Oracle to .NET (C#), with a focus on re-architecture rather than direct translation.Strong understanding of Oracle internals and how database logic integrates with external systems.Experience migrating data from Oracle to other...

Principal .NET engineer

Added 01/10/2025

We're hiring Back-End Lead / Principal .NET engineers for a greenfield AI platform (Azure, microservices). Dublin hub, hybrid. Worth a quick chat? Looking for contractors and Perm. Brief Description: Tech Stack: .NET Core, Azure services, microservices, and event-driven architectures, along with hands-on experience in GitHub/GitHub Actions for CI/CD. If you're interested, I'd love to connect and discuss further. Would you be available for a quick call today or tomorrow? I look forward to hearing from you soon.GCS is acting as an Employment Agency in relation to this vacancy.

Principal .NET engineer

Added 01/10/2025

We're hiring Back-End Lead / Principal .NET engineers for a greenfield AI platform (Azure, microservices). Dublin hub, hybrid. Worth a quick chat?Looking for contractors and Perm.Brief Description: Tech Stack: .NET Core, Azure services, microservices, and event-driven architectures, along with hands-on experience in GitHub/GitHub Actions for CI/CD. If you're interested, I'd love to connect and discuss further. Would you be available for a quick call today or tomorrow? I look forward to hearing from you soon.GCS is acting as an Employment Agency in relation to this vacancy.

QA Test Analyst (.Net & Oracle)

Added 10/07/2025

Role- QA Test Analyst (.Net & C#) Key ResponsibilitiesDevelop and execute detailed test plans and test cases across both the legacy Oracle-based platform and the new C#/.NET services.Validate that the re-engineered C# logic faithfully reproduces the functionality of existing Oracle PL/SQL procedures, triggers, and packages.Perform end-to-end data validation to ensure consistency and correctness during the migration.Collaborate with developers, DBAs, and business analysts to extract requirements, define expected behaviour, and identify test coverage needs.Support regression, integration, and system-level testing in a hybrid environment where both platforms co-exist temporarily.Assist with implementing or optimising automated testing tools and frameworks to enhance test repeatability...

C# / WPF / WCF / Winform Developer

Added 27/10/2025

Global bank based in Canary Wharf.Role - C# / WPF / WCF / Winform DeveloperDuration - 6 months with likely extensionRate - £415 p/d (inside IR35)Location - Hybrid / Canary WharfTech Stack C#WPFWinformsSQLOracleTasks 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...

Senior Java Developer (Back end engineer)

Added 20/10/2025

JOB DESCRIPTION:Hiring: Senior Java DeveloperType: Contract Inside IR35 -12 months ExtendableExperience : 7+yearsLocation : Hamphshire, UK [ Hybrid - 2 days onsite / week ]Rate : GBP 500 - 650 /day Inside IR35ResponsibilitiesAnalyze, design, program, test, and deploy new user stories and features with high quality (security, reliability, operations) to productionTends to Associate Application Engineers by providing learning tasks as well as work related tasks, directs the work of Senior Associate Application Engineers, and helps them continue to growAchieves team commitments (and influence others to do the same) by using informal leadership & highly developed communication skillsHas an oversight on...

C# / WPF / WCF / Winform Developer

Added 09/10/2025

Global bank based in Canary Wharf.Role - C# / WPF / WCF / Winform DeveloperDuration - 6 months with likely extensionRate - £415 p/d (inside IR35)Location - Remote / Canary WharfTech Stack C#WPFWinformsSQLOracleTasks 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...

Senior C# DotNet Developer (Contract)

Added 30/09/2025

Sr C# .Net DeveloperDublin - Hybrid7+ years required€450/day - €500/day We're looking for a Senior C# developer with strong .NET experience to build and support cloud-ready applications. You'll work across Windows, Mac, and Linux, using AWS services, and you'll get to dive into Systems & Connectivity, Databases, and Software Integrity. If you enjoy clean, test-driven code, automation, and working with Git in a collaborative team, this role offers plenty of technical variety and real impact.GCS is acting as an Employment Business in relation to this vacancy.

Senior Backend Javascript Developer - Remote - outside IR35

Added 25/09/2025

Senior Backend JavaScript DeveloperOutisde IR35 Remote and once in the London office every 2 weeks Our client, an innovative and forward-thinking technology business, is looking for a Senior Backend JavaScript Developer to join their growing engineering team. This is a fantastic opportunity for a seasoned developer who thrives on solving complex problems, building scalable systems, and mentoring others in a collaborative, agile environment.You will play a pivotal role in shaping the backend architecture, delivering high-quality code, and ensuring the platform continues to perform at scale as the business expands globally. Key skillsStrong proficiency in JavaScript/TypeScript with proven backend development experience.Hands-on...