21 contract systems engineer jobs found in London, greater london

Senior Network Engineer - 12 month Day Rate Contract (Outside IR35) Location: London (hybrid working of 3 days per week in the office) Duration: Initial 12 months The role will be responsible for designing and implementing solutions that compliment a dynamic, always growing and evolving global network for one of the leading organizations in financial services. Although the core focus of this role will be to act as a Network Engineer with a solid understanding of Network & IT Infrastructure Fundamentals including protocols, switches, routers/firewalls, it will also include exposure to experience operating within Azure & AWS cloud tenants. You will design and manage the local and wide area networks of our organization to ensure maximum up time for our users. Key Responsibilities: - Develop secure, scalable, and highly available network architectures using technologies like VPNs, VPCs, virtual networks, and load balancers. - Provision, configure, and manage cloud-based...

Data Engineer: Contract | Up to £400/day outside IR35 | Hybrid, London | 6 months initial A major consumer goods business is seeking a contract Data Engineer. The programme is consolidating a fragmented estate and standardising how things are done across the group. It's early days, the team is lean and the structure is still being shaped. As a Data Engineer, you'd be building and maintaining the pipelines that take data from disparate Legacy systems across the group and get it into a shared, reliable platform, working closely with senior engineers on the wider platform direction. There's a genuine green field element here, with real support from more senior members of the team as patterns and standards continue to be established. As a contract Data Engineer you'll be competent in: Building and maintaining ETL/ELT pipelines across cloud platforms (AWS/Azure/GCP) Working with modern data stack tooling such as dbt, Airflow, Databricks or Snowflake Supporting the...

Service Desk Support Analyst - 12 Month Contract - Hybrid in City Of London Contract: Initial 12 months (Outside IR35) Rate: £150 per day Location: Hybrid - City of London (Farringdon), 2-3 days on-site per week The Role A well-established American Managed Service Provider is looking for an experienced Infrastructure & Support Engineer to strengthen their internal IT team, supporting operations across the UK and Ireland. The end customer is a US-headquartered organisation currently expanding into the UK, Ireland and wider Europe, and this role has been created to provide additional hands-on support to the team through that growth. This is a broad, "out and out" support role covering networking, data centre infrastructure, systems administration and end-user support - ideal for a versatile engineer who enjoys variety and is comfortable working across the full IT stack. Key Responsibilities Providing IT support across networking, data centres and wider...

Senior Network Engineer - 12 month Day Rate Contract (Outside IR35) Location: London (hybrid working of 3 days per week in the office) Duration: Initial 12 months The role will be responsible for designing and implementing solutions that compliment a dynamic, always growing and evolving global network for one of the leading organizations in financial services. Although the core focus of this role will be to act as a Network Engineer with a solid understanding of Network & IT Infrastructure Fundamentals including protocols, Switches, Routers/Firewalls, it will also include exposure to experience operating within Azure & AWS cloud tenants. You will design and manage the local and wide area networks of our organization to ensure maximum up time for our users. Key Responsibilities: - Develop secure, scalable, and highly available network architectures using technologies like VPNs, VPCs, virtual networks, and load balancers. - Provision, configure, and manage cloud-based...

AI Engineer - LLM & Agentic Systems London - Hybrid. Circa £500 - £675 per day (and negotiable DOE) Contract (Outside IR35) Mid-level, Senior & Lead. Agentic AI / Machine Learning. Company: Our client is a globally established data and information services business, operating across multiple high-value industry sectors. They have established data science and machine learning engineering teams already delivering in production, and are now expanding their AI capability significantly across the global organisation. This is a role for people who ship. If you 've built LLM-powered systems and agentic workflows that are live in production - not demos, not prototypes - and you want to do that at genuine scale, this is worth applying for. What you 'll be working on as an AI Engineer - LLM & Agentic Systems: Designing and building AI agents and agentic workflows - combining LLMs, RAG,...

Outside IR35 contract - 8 months FULLY REMOTE Rate: £260/day Infrastructure Engineer | 8 Month Contract | Outside IR35 | Fully Remote Rate: £260/day Outside IR35 Project duration: 8 months Fully Remote Industry: Highly Regulated Financial Services Organisation Job Summary: We re working with a highly regulated financial services organisation looking for an experienced Infrastructure Engineer to support and enhance their enterprise technology estate. The successful candidate will bring strong Microsoft infrastructure experience, including Active Directory, Windows Server, Azure, Microsoft 365, virtualisation, backup and disaster recovery solutions . Experience working within regulated environments and maintaining business-critical systems is highly desirable. Key Responsibilities Support and maintain core infrastructure platforms across production and non-production environments. Deliver infrastructure improvements, upgrades and operational...

Senior C# Engineer – .NET 9/10, AWS Lambda, SQS, SNS – OUTSIDE IR35 £700–£800 per day • Outside IR35 ? 100% Remote • 11-month rolling contract Takeaway: Contribute to the architecture and build of a major greenfield B2B SaaS platform as a deeply senior, hands-on C# engineer, with heavy emphasis on deep .NET engineering , high-performance distributed systems , and real-world AWS serverless delivery . You’ll also have the opportunity to develop hands-on skills with Claude Code , one of the most advanced AI-assisted development tools in the industry. Role Overview: You’ll operate as the technical spearhead for a greenfield product build, reporting to the Director of Engineering. Expect deep backend engineering, distributed system design, and high-quality serverless delivery, plus the chance to adopt modern AI-assisted development practices as part of your workflow. What You’ll Bring: Senior/Staff-level backend mastery in C# and .NET 9/10 , with...

Initial 6 months - Outside IR35 Contract Rate: Up to £400/day Hybrid: 3-day onsite a week Security Operations Engineer | Microsoft Security Technologies | Contract Outside IR35 Hybrid: 3-day onsite (Bank Station) OR Liverpool office Rate: £350-£400/day (Outside IR35) Contract Duration: Initial 6 months with a potential extension Industry: Highly Regulated Environment Job Summary: Seeking for a Security Operations Engineer to join one of our highly regulated client on a contract basis. you'll be responsible for monitoring, detecting, investigating, and responding to security threats across Microsoft and hybrid environments. you'll play a key role in safeguarding critical business systems through proactive threat hunting, incident response, detection engineering, and operational support of core security programmes. Key responsibilities: Investigate and respond to escalated security incidents and events Perform event-based and policy-based threat...

Senior React Engineer – React, Typescript, Tailwind, Figma, UX & UI – Global B2B SaaS ? £600 - £700 per day ? Outside IR35 ? 12-month contract ?100% remote About the Role: Outstanding contract opportunity to join this global, market leading B2B SaaS organisation. We’re looking for a Senior React UI Engineer who blends strong frontend engineering with credible design instincts to contribute to the frontend design & development of a greenfield platform . You’ll be the person who knows when something is ugly versus broken and you’ll spend your time fixing the latter. We ship fast, we prioritise function over form, and we need someone who thrives in that environment. What You’ll Do: Build and refine UI for a high-growth B2B SaaS product , using React, TypeScript, and Tailwind. Own our Tailwind-based component library , keeping it aligned (best effort, not pixel-perfect) with our Figma design system. Act as a go-to for UX questions ,...

Senior / Lead Software Engineer (Java) Outside IR35 Hybrid (2 Days Onsite in central London) Our client urgently seeks an experienced Senior Software Engineer with extensive Java expertise to take a lead role in the design,development and support of scalable, cloud-native backend applications. Working within an Agile, DevOps environment, you'll help build high-performance microservices, APIs and event-driven solutions powering a next-generation platform used at significant scale. This is an exciting greenfield programme, working alongside engineers, operations and product teams to deliver software that supports critical business operations. Essential Experience Extensive commercial experience developing enterprise applications with Java and Spring Boot Proven track record designing and delivering high-throughput, distributed microservices at scale Strong experience building event-driven architectures using Kafka Expertise with PostgreSQL and Couchbase in...

QA Test Engineer 3-month contract | £340 per day Outside IR35 | Hybrid - London/Remote We are looking for an experienced QA Test Engineer to support a business-critical system replacement programme, covering system integrations, data migration, business processes and user acceptance testing. Responsibilities Create and maintain test plans, scripts and documentation Execute functional, integration, regression and end-to-end testing Validate data migration, data quality and reconciliation Manage defects and work with developers to verify fixes Support UAT, release readiness and go-live activities Experience required Previous QA experience on a business-system implementation Strong manual, integration and regression testing skills Experience testing web applications and business-critical systems Data migration, validation and reconciliation experience Strong communication, documentation and stakeholder-management skills Desirable...

QA Engineer: Contract | Up to £500/day outside IR35 | Hybrid, London | 6 months initial A major consumer goods business is seeking a contract QA Engineer. The programme is consolidating a fragmented estate and standardising how things are done across the group. It's early days, the team is lean and the structure is still being shaped. As a QA Engineer, you'd be building out testing coverage across newly developed and migrated systems, making sure quality standards are established early as new processes and platforms come online. It's hands-on, with plenty of scope to help define how testing is done across the wider programme. As a contract QA Engineer you'll be competent in: Designing and executing manual and automated test cases across web/API/data layers Working with test automation frameworks (eg Selenium, Playwright, Cypress) Identifying gaps in coverage across systems with limited existing documentation Working autonomously in an unstructured environment with...

Back End Developer (Node.js) Senior Software Engineer Pricing & Inventory (Node/TypeScript) Contract: 6 months initially Rate: Up to £420 per day, Outside IR35 Location: Can be worked fully remote We re supporting a high-traffic global E-commerce platform in its search for a Senior Software Engineer to improve its pricing, inventory and availability systems. This is a hands-on role focused on building reliable, scalable services that process millions of customer searches across multiple international markets. What you'll be working on Building and improving pricing, inventory and availability services Developing quote-caching and data freshness strategies Designing resilient APIs and third-party integrations Reducing latency and improving platform performance Balancing pricing accuracy with cache efficiency and infrastructure cost Improving monitoring, tracing and production observability Owning solutions from investigation through to...

Senior Data Engineer: Contract | Up to £550/day outside IR35 | Hybrid, London | 6 months initial A major consumer goods business is seeking a contract Senior Data Engineer. The programme is consolidating a fragmented estate and standardising how things are done across the group. It's early days, the team is lean and the structure is still being shaped. As a Senior Data Engineer, you'd be building the pipelines and data infrastructure that underpin the wider transformation, taking data from disparate Legacy systems across the group and getting it into a shared, reliable platform. There's a genuine green-field element here: patterns and standards are still being established, and you'll have real influence over how the platform evolves. As a contract Senior Data Engineer you'll be competent in: Designing and building scalable ETL/ELT pipelines across cloud platforms (AWS/Azure/GCP) Working with modern data stack tooling (eg dbt, Airflow, Databricks, Snowflake)...

Senior Cloud Engineer - GCP/Kubernetes We are looking for a Senior Cloud Engineer to take ownership of the cloud infrastructure supporting a major new data platform. This is a hands-on contract role focused on GCP, Kubernetes, infrastructure as code, CI/CD and observability within secure, highly regulated environments. The Role You will desiHqagn, build and operate a distributed cloud platform spanning edge and central Kubernetes clusters. The environment uses a predominantly open-source technology stack, placing particular emphasis on networking, inter-cluster connectivity, platform security and deployment into restricted environments. You will work within an autonomous engineering team, establishing the infrastructure foundations that enable reliable and secure software delivery. Key responsibilities will include: Designing and operating secure, resilient infrastructure within Google Cloud. Building and managing production Kubernetes clusters using GKE. Supporting a...

Outside IR35 contract - 8 months FULLY REMOTE Rate: £260/day Infrastructure Engineer | 8 Month Contract | Outside IR35 | Fully Remote Rate: £260/day Outside IR35 Project duration: 8 months Fully Remote Industry: Highly Regulated Financial Services Organisation Job Summary: We re working with a highly regulated financial services organisation looking for an experienced Infrastructure Engineer to support and enhance their enterprise technology estate. The successful candidate will bring strong Microsoft infrastructure experience, including Active Directory, Windows Server, Azure, Microsoft 365, virtualisation, backup and disaster recovery solutions . Experience working within regulated environments and maintaining business-critical systems is highly desirable. Key Responsibilities Support and maintain core infrastructure platforms across production and non-production environments. Deliver infrastructure improvements, upgrades and operational...

A public sector organisation is seeking a Senior AWS Platform Engineer to join via a Consultancy to join a strategic programme delivering and evolving a cloud-based occupancy data platform hosted within AWS. The platform ingests and processes data from a range of sources including WiFi networks, IoT sensors and wider property technology systems, generating occupancy insights that support data-driven decision making across a large-scale estate. As the Senior AWS Platform Engineer you will play a key role in the design, build and support of the cloud infrastructure, integrations and automation capabilities that underpin the platform. This is an excellent opportunity for an experienced AWS specialist who enjoys solving complex technical challenges, building cloud-native services and working across platform engineering, DevOps and systems integration. This is an initial contract until May 2027 with potential to be extended, it is one day per week in the office in Central...

Data & Software Engineer £550- £590 per day | Outside IR35 | Fully Remote | 6-Month Contract THE COMPANY A leading digital business operating within a highly data-driven online environment is seeking a Data & Software Engineer to support the development of critical commercial and operational data platforms. This organisation processes large volumes of transactional, revenue, and user performance data, using these insights to drive key business decisions. As part of a growing engineering function, they are investing heavily in their data ecosystem and require an experienced contractor to support several high-priority initiatives. Candidates from online gaming, iGaming, betting, gambling, esports, or other high-volume digital platforms are particularly encouraged to apply. THE ROLE As a Data & Software Engineer, you 'll work across backend engineering, data processing, and systems integration, helping to enhance platforms that provide...

Senior Software Engineer - Outside IR35 - Contract (Energy) About the role We are looking for a Senior Software Engineer (ideally with some Data Engineering experience) to join our client team in the energy trading sector. End date is not certain, but likely to be December 2026 or early Q1 2027. We are looking for experience in the following technologies: Microsoft Azure ecosystem Understanding of networking & security options in Microsoft Azure Infrastructure-as-code (preferably Bicep) Python Experience in the below would also be beneficial: Azure DevOps (pipelines) SQL We generally spend 2 days per week on-site with the client in central London (Monday & Thursday). £500-600 per day outside IR35 Start date: 10/08/2026 End date: December 2026 or early Q1 2027 About Softwire Softwire is a leading UK technology and strategy consultancy. From enterprise to government, we help visionary organisations turn...

Senior Data Migration Engineer - SAP London Based - Onsite 1 day per week, mostly remote after the first month 6 month contract Outside of IR35 £410.00 We are seeking experienced Data Migration Analysts to support a large-scale global transformation programme that is replacing core ERP and Middle Office platforms across a substantial multi-site UK operation. Data migration is critical to the success of the programme, and you'll play a key role in preparing high-quality data for pilot go-live and subsequent deployment phases. This is an exciting opportunity to join a high-profile transformation initiative and take ownership of hands-on data migration activities, enabling operational teams to focus on subject matter expertise and business validation. What You'll Be Doing As a Data Migration Analyst, you'll be responsible for executing the end-to-end data preparation process across multiple data domains, ensuring data is mapped, cleansed and ready for migration....