Staff Engineer- Backend JavaScript -outside IR35

Added 28/02/2026

Staff Engineer- Backend JavaScript (Node.js / TypeScript) Contract - Outside IR35Location: London / Hybrid (once every two weeks) Contract: Outside IR35 Duration: 6 months initial (extension likely) Our client, an innovative and forward‑thinking technology business, is looking for a Backend JavaScript Staff Engineer to join a high‑performing engineering team. This is a fantastic opportunity for a highly experienced, hands‑on backend engineer who enjoys solving complex technical problems, building scalable systems, and providing technical leadership across teams.You will play a key role in shaping backend architecture, improving platform reliability and performance, and raising engineering standards while remaining deeply involved in hands‑on...

Software Engineering Lead- Javascript, AWS- outside IR35

Added 17/03/2026

Software Engineering Lead - Backend (JavaScript / TypeScript, Node.js, AWS, Kafka)Outside IR35Remote with 2 days a month in the office in LondonWe're looking for an experienced Software Engineering Lead with a strong backend development background to lead the delivery of scalable, cloud‑native systems.Key skills:Strong commercial experience with JavaScript, TypeScript, and Node.jsProven experience building event‑driven systems using KafkaStrong AWS experience across modern cloud servicesBackground designing and operating microservices / distributed systemsHands‑on technical leader with experience mentoring engineers and leading deliveryRole overview:Lead backend architecture and development while remaining hands‑onDrive best practices through code reviews and technical leadershipWork closely with Product, DevOps, and...

Full Stack Developer (.Net/JavaScript)

Added 23/04/2026

Job Title: Senior .NET/JavaScript Full Stack Developer Location: Limerick (Hybrid 2 days flexible) Type: 6 Months contract (with possible extension)Overview: 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...

Backend Software Developer (Java/Spring Boot)

Added 31/03/2026

Job Description:We are seeking a Backend Software Developer with expertise in Java and Spring Boot to build robust and scalable enterprise applications. The ideal candidate will have strong problem-solving skills and experience working in agile environments.Key Responsibilities:Develop backend services using Java and Spring BootDesign and manage databases and data modelsBuild secure and high-performance APIsParticipate in system design and architecture discussionsDebug, troubleshoot, and improve existing systemsCollaborate with cross-functional teamsRequired Skills & Qualifications:4+ years of experience in backend developmentStrong knowledge of Java and Spring Boot frameworkExperience with relational databases (MySQL, PostgreSQL)Understanding of RESTful services and API designFamiliarity with build tools like Maven...

Backend Software Developer (Node.js)

Added 31/03/2026

Job Description:We are looking for a skilled Backend Software Developer with strong experience in Node.js to join our growing engineering team. You will be responsible for building scalable APIs, optimizing server-side performance, and collaborating with frontend developers to deliver high-quality products.Key Responsibilities:Develop and maintain RESTful APIs using Node.js and ExpressDesign and implement scalable backend architecturesIntegrate third-party APIs and servicesOptimize application performance and ensure high availabilityWork closely with frontend developers and product teamsWrite clean, maintainable, and well-documented codeRequired Skills & Qualifications:3+ years of experience in backend developmentStrong proficiency in Node.js and Express.jsExperience with databases such as MongoDB or PostgreSQLFamiliarity with cloud...

Backend Software Engineer

Added 09/04/2026

BACKEND SOFTWARE ENGINEERJob Title: Backend Software Engineer Location: Burnsville, MN Industry: Manufacturing / Automation / Fiber OpticsDetailed Job Description:We are seeking a Backend Software Engineer to join a growing automation engineering team developing custom manufacturing equipment for a high-volume fiber optics production environment. This role is focused on backend software development supporting industrial automation systems, equipment control, data acquisition, and manufacturing process integration.You will work alongside mechanical, electrical, and controls engineers to develop the software systems that drive custom automation equipment - from machine-level control applications to data collection, reporting, and integration with manufacturing execution systems. This position is based...

Backend Java Engineer (12 Month contract)

Added 19/03/2026

Backend Java Engineer (12‑month contract)Dublin - Hybrid/OnsiteWe're supporting a major voice‑technology organisation in scaling their third‑party (3P) API integrations across multiple countries. The team is growing and now looking for Backend Java Engineers to join an established engineering group delivering real, high‑impact user experiences.What You'll Work OnEnhancing and scaling existing 3P API integrationsLocalising integrations for new international marketsWorking directly inside an established backend teamPicking up active workstreams with full onboarding supportContributing to distributed, high‑scale systems used globallyCore Requirements✔ Strong Backend Java engineering ✔ API integration experience ✔ Microservices architecture ✔ Distributed systems ✔ Cloud platform experience (AWS‑equivalent acceptable) ✔ Ability...

2nd Line Engineer- Hybrid (Outside IR35)

Added 20/04/2026

Essential RequirementsReliability and infrastructure services. Focus on patching of vulnerabilities with our digital Windows and WMWare environment within our data centers and Cloud environments. Service Scope and DeliverablesSystem and application patching on the following technologies:Citrix.Hardware.VMWare.Windows Server.M365.Core data centre services such as AD, Group Policy, DNS, VPN, AV, MFA, WSUS, SCCM, monitoring tools etc.SAN storage and backup.Multi Factor Authentication.MS AzureVulnerability assessment and patch identification.Patch prioritisation and risk scoringPatching using technologies WSUS and Tanium.Testing and deploying patching to ensure they do not impact productionConfirmation and validation of successful patch deploymentCreation and input into RFC process as part of ITSMGCS is acting as...

Fractional CISO - FinTech (Contract / Outside IR35)

Added 07/04/2026

Fractional CISO - FinTech (Contract / Outside IR35)Location: London (Fully Remote) Engagement: Fractional (2-3 days per week) Duration: 6-12 Months Rate: £1000pd+ (Outside IR35)The OpportunityGCS Cyber are partnering with a rapidly growing PE backed FinTech firm as they scale their security capability and mature their overall cyber posture.This is a Fractional CISO engagement, ideal for a senior security leader who can provide strategic direction while remaining hands-on where needed.You'll be working closely with the executive team, helping shape security strategy in line with business growth, regulatory expectations, and investor confidence.Key ResponsibilitiesDefine and lead the cyber security strategy and roadmapEngage with...

OT Cyber Security Engineer (Outside IR35)

Added 07/04/2026

OT Cyber Security Engineer - Contract (Outside IR35)Location: UK (Remote with occasional travel) Duration: 12 Months Rate: Competitive (Outside IR35)The OpportunityWe're supporting a major programme within the OT / Industrial Cyber Security space, delivering security improvements across critical environments.This is a project focused contract, ideal for an experienced OT Cyber Security Engineer who has worked within live industrial environments and understands the challenges of securing legacy and operational systems.Key ResponsibilitiesDeliver OT security improvements across industrial environmentsSupport security assessments, risk identification, and remediation activitiesWork closely with engineering and operational teams to implement controlsContribute to network segmentation, asset visibility, and monitoring initiativesSupport...

Lead Software Engineer- outside IR35

Added 18/03/2026

Lead Software Engineer (Backend) JavaScript/TypeScript, AWS, Kafka Outside IR35 ContractMy London based client is urgently looking for an experienced Lead Software Engineer with a strong back-end focus to lead the build and evolution of scalable, cloud-native services. You'll set technical direction, mentor engineers, and stay hands-on delivering production code.What you'll do:Lead backend design and development (Node.js, TypeScript/JavaScript)Build and operate event-driven microservices using KafkaOwn AWS-based delivery (scalability, performance, reliability, security)Drive engineering standards: code reviews, testing strategy, CI/CD, observabilityPartner with Product/Architecture to translate requirements into robust solutionsKey skills:Strong commercial backend experience with JavaScript/TypeScript (Node.js)Kafka experience (event-driven systems, distributed messaging)Strong AWS experience across...

Project Manager (Outside Ir35)

Added 17/02/2026

My Utilities client are looking for an experience Project Manager to join their team on an initial 6 month outside ir35 contract roleThe role will require you to be on site 2/3 days a week in their Guildford Office Key responsibilities/Experience Experience delivering complex projects, specialising in financial processes, requirements gathering, and end-to-end delivery.Strong background partnering with Finance and Commercial teams to manage sales ledgers, oversee invoicing, develop robust financial business cases, and report to Senior Leadership teams.Proven experience engaging Sales teams and customers to capture new requirements, produce competitive bids, negotiate commercial terms, and consistently achieve revenue and delivery...

Business Analyst - MS Purview - Outside ir35

Added 16/02/2026

Role: Business Analyst - Microsoft Purview Duration: 6-month rolling contract Rate: Negotiable DOE - Outside IR35 Location: Preston - HybridGCS Cyber are supporting a large organisation enhancing its data governance and data protection capabilities across their Microsoft 365 environment.They are now looking for an experienced Business Analyst to help shape data classification standards, strengthen data loss prevention controls, and coordinate stakeholder engagement across multiple business functions.Must have: * Strong Business Analysis background with experience across IT systems * Experience with Microsoft Purview * Experience defining or refining business rules within the M365 suite * Strong workshop planning, stakeholder engagement and...

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...