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...

Python Engineer- back end - fully remote

Added 17/09/2025

Python Engineer Back End - Agentic AI & ChatbotsFully remote My client are seeking a Python Back End Engineer with strong Python experience who has worked on AI projects, particularly in the realm of agentic AI or chatbot development. You will be responsible for building and maintaining scalable backend systems that power intelligent conversational agents, integrating advanced AI models into production environments.Key skills:Develop and maintain Python-based backend services supporting agentic AI and chatbot functionalities.Proven backend engineering experience with Python, ideally in AI-driven projects involving conversational agents or chatbots.Understanding of agentic AI concepts, dialogue systems, or autonomous AI workflows.Design and implement...

Senior Java Engineer - Fintech - Remote - Contract or Perm

Added 20/10/2025

Senior Java Engineer - Fintech - Remote - Contract or PermLocation: Remote / UK-based Contract Length: 6-12 months (initial) Start Date: ASAPWe're looking for a Contract Java Engineer to join the team - a high-performing, cross-functional team of UX Designers, Software Engineers, QA Engineers, and Technical Writers.You'll be contributing to the Engagement Banking Platform, delivering new features, proof-of-concepts, and technical improvements across a suite of digital banking products. This is a hands-on engineering role where you'll take ownership from design through to release, working within a modern microservices environment.The RoleAs part of an autonomous Agile team, you'll:Design, build, and deliver...

Delivery Manager - Java / Spring Boot Migration to Kubernetes

Added 14/10/2025

Delivery Manager - Java / Spring Boot Migration to Kubernetes (GCP) Contract Our client, a global technology organisation, is migrating a core on-premise Java Spring Boot application to Kubernetes on Google Cloud Platform (GCP). They're seeking an experienced Delivery Manager to lead this critical modernisation initiative. Role OverviewYou'll manage the end-to-end delivery of the migration, coordinating cross-functional engineering, DevOps, and architecture teams. The role requires strong delivery leadership, technical awareness, and experience driving outcomes in complex, cloud-focused environments. Key Skills & ExperienceProven track record delivering cloud or platform migrations (on-prem to cloud).Solid understanding of Java / Spring Boot, Kubernetes, and...

C# / WPF / WCF / Winform Developer

Added 04/11/2025

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...

Sr .Net Full Stack Developer

Added 31/10/2025

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

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...

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...

Senior C# DotNet Developer

Added 25/09/2025

Sr C# .Net DeveloperDublin - Hybrid7+ years required€70,000 - €80,000 base salary + benefits 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 Agency in relation to this vacancy.

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...

Backend Developer - Fully Remote

Added 19/09/2025

Backend Developer - Fully Remote Outside IR35 - Abu Dhabi-based client - 6 month contractJob Summary:We are seeking a Backend Developer to drive the development and implementation of the Sovereign AI Platform architecture. In this role, you will collaborate with cross-functional engineering teams, define scalable software components, and ensure adherence to best practices in architecture, code quality, and development processes. You will work closely with product managers to translate business requirements into robust technical solutions and lead complex system integrations. This position also involves mentoring team members and establishing a high-performance engineering culture focused on innovation, scalability, and reliability.Key Responsibilities:Lead...

IAM Developer (Azure)

Added 19/09/2025

IAM DeveloperWe are seeking an experienced IAM Developer to join our team and play a key role in building and securing digital identity solutions. The ideal candidate will bring strong development skills, deep knowledge of authentication protocols, and a passion for delivering secure and seamless user experiences.Key ResponsibilitiesDevelop, integrate, and maintain IAM and CIAM solutions across applications and platforms.Implement secure authentication and authorization workflows using OAUTH2, SAML, and FIDO security standards.Apply best practices in change management (TCM) to ensure compliance, security, and system stability.Collaborate with cross-functional teams to enhance Identity Access & Security (IAS).Work with infrastructure-as-code tools (Terraform) to deploy...

C# / WPF / WCF / Winform Developer

Added 18/09/2025

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...