Senior Full Stack Developer - Security

Added 19/05/2026

Senior Full Stack Developer - Identity & Access ManagementPosition SummaryWe are seeking an experienced Senior Full Stack Developer to join a high-performing engineering team supporting enterprise Identity & Access Management (IAM) applications within a large-scale security organization. This role will focus on the design, development, integration, and modernization of secure enterprise applications used internally across the organization.The ideal candidate will possess strong expertise across both frontend and backend development, with deep experience in Angular, Java, Spring Boot, REST API development, cloud-native AWS services, and secure application development practices. This individual will play a key technical leadership role within the team,...

Senior UI Developer (React / Java)

Added 05/05/2026

We are hiring a Senior UI Developer to join a leading banking client working on a greenfield electronic trading platform within their Fixed Income technology team.This is a hands-on development role building a next-generation eTrading application used by front office traders and sales teams to price, quote, and execute trades in real time.London (Liverpool Street) | Hybrid (50% office)💰 Up to £900-1000 per day (Inside IR35)📅 12-month contractThey're looking for someone with:Strong React + AG Grid experience building trading UIsSolid Java backend Front office eTrading / Fixed Income or FX backgroundExperience with low-latency systems & RFQ workflowsIt's a hands-on build...

Senior eTrading Java Developer - FX eRisk

Added 24/03/2026

Join a cutting-edge FX eRisk team driving low-latency trading, pricing, and algorithmic execution. Work on distributed, high-performance systems powering global FX markets. Senior eTrading Java Developer - FX eRisk Location: Canary Wharf, London | Contract: 35 hrs/weekWhat You'll Do:Design, develop, test, and deploy Java-based trading and pricing systems.Build low-latency, multi-threaded, highly available solutions.Collaborate with business stakeholders and global teams.Contribute to algorithmic execution and pricing innovations.You Have:Strong Java server-side development & multi-threading experience.Experience with distributed, low-latency trading systems.Knowledge of FX spot or equities algo execution & pricing.Agile delivery experience and excellent problem-solving skills.Bonus Points:FIX protocol, KDB, lock-free algorithms, enterprise integration, front...

Senior iOS Developer (UI/UX/CX)

Added 20/03/2026

Purpose of the roleTo design, develop and improve software, utilising various engineering methodologies, that provides business, platform, and technology capabilities for our customers and colleagues. AccountabilitiesDevelopment and delivery of high-quality software solutions by using industry aligned programming languages, frameworks, and tools. Ensuring that code is scalable, maintainable, and optimized for performance.Cross-functional collaboration with product managers, designers, and other engineers to define software requirements, devise solution strategies, and ensure seamless integration and alignment with business objectives.Collaboration with peers, participate in code reviews, and promote a culture of code quality and knowledge sharing.Stay informed of industry technology trends and innovations and actively...

Senior Power BI Developer

Added 18/03/2026

Title: Senior Power BI DeveloperLocation: Fully Remote (Ireland-based candidates preferred)Contract Type: Contract (Initial 6 months, strong likelihood of extension)Role OverviewWe are seeking a Senior Power BI Developer to play a key role in reducing a significant BI backlog and advancing the organisation's Power BI capability.This is an end-to-end role requiring expertise beyond visualisation including data modelling, performance optimisation, and working with upstream data. You will act as a technical owner and trusted advisor, contributing to both delivery and strategic direction within a small BI & Digital Transformation team.Key ResponsibilitiesDesign, develop, and deliver high-quality Power BI reports and dashboardsBuild and maintain...

Senior Backend JavaScript Developer Outisde IR35

Added 22/02/2026

Senior Backend JavaScript Developer Outisde IR35 Remote and once in the London office every 2 weeksOur 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 Back End architecture, delivering high-quality code, and ensuring the platform continues to perform at scale as the business expands globally.Key skills Strong proficiency in JavaScript/TypeScript with proven Back End development...

Senior D365 Developer

Added 09/02/2026

Dynamics 365 Developer - Dublin (Hybrid)I'm working with an enterprise client undergoing a major digital transformation and looking for an experienced Dynamics 365 Developer to join their team. What you'll do:Configure & customise Dynamics 365 Build Power Automate flows, BPFs, workflowsDevelop plugins & JavaScriptWork with CI/CD, Azure DevOps & GitSupport integrations and collaborate with architectsOperate within Agile squadsWhat we're looking for:6+ years' experience with D365Experience with Azure integrations If you're an experienced D365 Developer interested in a long-term transformation programme in Dublin, apply here for a confidential chat. GCS is acting as an Employment Agency in relation to this vacancy.

Senior / Lead Consultant

Added 03/06/2026

With a strong reputation for delivering top-tier talent to leading organizations, we foster a dynamic and growth-oriented work environment. We are now looking for a driven 360 Recruitment Consultants to join our Technology division, playing a key role in driving new business and placing high-caliber candidate,Your Role-As a Consultant, you will take full ownership of the recruitment process-from client acquisition and relationship management to candidate sourcing and placement. You'll be instrumental in growing our tech recruitment function, building strong industry connections, and exceeding placement targets.Key Responsibilities -Business Development & Client Engagement-Identify and acquire new clients, building long-term relationships with key...

Senior Data Engineer

Added 25/05/2026

About the RoleOur client is a global data and artificial intelligence (AI) organisation that partners with leading businesses to transform operations, enhance decision-making, and drive growth through advanced analytics and digital solutions.With a large international presence and a strong reputation across industries such as financial services, healthcare, retail, and insurance, the organisation delivers innovative, data-driven solutions at scale. Role Title: Databricks Data EngineerLocation: Dublin, Republic of Ireland (Hybrid) Employment Type: ContractRole OverviewWe are seeking a hands-on Databricks Data Engineer to support a major data transformation programme focused on automating reporting and dashboard solutions.This is a delivery-focused role where you will...

Senior AI Engineer

Added 14/05/2026

Senior AI Engineering Leader - Enterprise GenAI PlatformsA global enterprise organisation is building out its next-generation AI engineering capability and is seeking a senior leader to drive the strategy, architecture, and delivery of enterprise-scale GenAI platforms and applications.This role sits within a central engineering enablement function focused on accelerating software delivery, modernising engineering practices, and embedding AI capabilities across large-scale technology teams.The position will lead multiple engineering teams responsible for delivering scalable, secure, and production-grade GenAI solutions in a highly regulated environment.Key Responsibilities* Define and lead the GenAI engineering roadmap and operating model* Drive enterprise adoption of AI engineering standards...

Senior Python Engineer (AI Platforms & Distributed Systems)

Added 12/05/2026

Senior Python Engineer (AI Platforms & Distributed Systems)Location: Chicago Work Arrangement: Hybrid Employment Type: ContractOverviewWe are seeking a highly specialized Senior Python Engineer to design and build scalable backend platforms, automation frameworks, and distributed systems within a cloud-native environment. This role requires deep expertise in Python development, microservices architecture, API engineering, and high-performance data processing.The ideal candidate will have strong experience developing enterprise-grade applications, building scalable services, and working across modern DevOps and cloud ecosystems.Key ResponsibilitiesDesign and develop scalable backend applications and distributed systems using PythonBuild high-performance RESTful and asynchronous APIsDevelop microservices and event-driven architecturesOptimize application performance, concurrency, and scalabilityCollaborate...

Senior AWS Big Data Architect (Cloud Data Platforms & Streaming Analytics)

Added 12/05/2026

Senior AWS Big Data Architect (Cloud Data Platforms & Streaming Analytics)Location: Chicago Work Arrangement: Hybrid Employment Type: ContractOverviewWe are seeking a highly specialized AWS Big Data Architect to lead the design and implementation of enterprise-scale cloud data platforms and real-time analytics solutions. This role requires deep expertise across AWS data services, distributed processing frameworks, streaming technologies, and large-scale data architecture.The ideal candidate will have extensive experience building modern lakehouse architectures, optimizing high-volume ETL pipelines, and enabling scalable analytics and machine learning workloads within cloud-native environments.Key ResponsibilitiesArchitect and implement scalable big data solutions on AWSDesign modern data lake and lakehouse architecturesBuild...

Senior Golang Engineer

Added 12/05/2026

Senior Golang EngineerLocation: Chicago Work Arrangement: Hybrid Employment Type: ContractOverviewWe are seeking a highly specialized Senior Golang Engineer to join a cutting-edge platform engineering team building scalable, cloud-native distributed systems. This role requires deep expertise in Golang development, Kubernetes orchestration, and high-throughput backend architectures operating within enterprise-scale environments.The ideal candidate will have strong experience developing microservices, optimizing concurrency-heavy applications, and working across modern infrastructure and observability ecosystems.Core ResponsibilitiesArchitect and develop high-performance backend services using GolangDesign scalable microservices and event-driven systemsBuild and maintain gRPC and RESTful APIsDevelop applications optimized for concurrency, resiliency, and low latencyWork closely with SRE and platform teams...

Senior Data Scientist

Added 11/05/2026

🚀 Senior Data Scientist | Ecommerce | Product Analytics & Machine LearningWhat if your next role allowed you to shape the digital experience of millions of users through advanced analytics, experimentation, and machine learning?We're working with a global consumer-focused business undergoing a major digital transformation, and they're looking for a Senior Data Scientist to join their Ecommerce & Digital Analytics team.This is a highly product-oriented role where data science goes far beyond reporting. You'll help build intelligent, data-powered experiences that directly influence customer journeys, personalization, conversion, and business performance at scale.🔹 What you'll be doing:* Building predictive and prescriptive analytics...

Senior Data Scientist

Added 11/05/2026

🚀 Senior Data Scientist | Ecommerce | Product Analytics & Machine LearningWhat if your next role allowed you to shape the digital experience of millions of users through advanced analytics, experimentation, and machine learning?We're working with a global consumer-focused business undergoing a major digital transformation, and they're looking for a Senior Data Scientist to join their Ecommerce & Digital Analytics team.This is a highly product-oriented role where data science goes far beyond reporting. You'll help build intelligent, data-powered experiences that directly influence customer journeys, personalization, conversion, and business performance at scale.🔹 What you'll be doing:* Building predictive and prescriptive analytics...