1 to 25 of 44 Contract REST Jobs in London

Java Developer

Hiring Organisation
Denizns Ltd
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
£400/day
design documentation What you'll bring Active SC clearance (essential) 3+ years' experience as a Java Developer (Java 8+) building microservices Strong Spring Boot, REST API design and SOAP/WSDL/XML experience TDD and BDD experience using JUnit and Cucumber Docker, Kubernetes, Jenkins, CI/CD and SonarQube ...

Principle Engineer

Hiring Organisation
Sanderson Government and Defence
Location
London, United Kingdom
Employment Type
Contract
Experience operating within Agile and DevOps delivery models. Desirable Skills: Application & Integration Technologies C# .NET Entity Framework JavaScript React Vue.js Windows Presentation Foundation (WPF) REST APIs Microservices architecture AI & Data Technologies AWS SageMaker Large Language Model (LLM) integrations AI-assisted analytics solutions Python-based data analysis tooling Architecture & Governance Enterprise ...

Principal Developer

Hiring Organisation
Sanderson Recruitment
Location
London, United Kingdom
Employment Type
Contract, Work From Home
Contract Rate
Up to £600 per day + Inside IR-35
documentation. Supporting the continuous improvement of engineering capability and delivery processes. Essential Skills Java & Software Engineering Strong commercial Java development experience. Spring Boot. Maven. REST and SOAP services. Experience delivering large-scale enterprise systems handling high transaction volumes. Strong understanding of software engineering best practices and modern development approaches. ...

Blockchain Engineer

Hiring Organisation
Ubique Systems UK Limited
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
GBP Annual
Software Engineering, or a related discipline Fluent English communication skills (C1 level or above) Technical Skills Strong experience in: Java (preferred) Kotlin Spring Boot REST APIs Microservices Architecture Experience with: Event-driven architectures Kafka RabbitMQ or similar messaging technologies SQL and NoSQL databases Containerization (Docker) Kubernetes CI/CD pipelines ...

Python Developer

Hiring Organisation
Hays Technology
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
£550 - £617/day Up to £617.55 per day VIA UMB
APIs. Knowledge of modern Python features, including asyncio, type hints and context managers. Go development experience, including concurrent applications, services, CLI tools and REST APIs. Experience with Go modules, error-handling patterns, testing and code organisation. Strong AWS experience using boto3 and aws-sdk-go-v2. Experience working with ...

Software Engineer

Hiring Organisation
Brio Digital
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
£480 - £500/day
Support CI/CD pipelines and modern DevOps practices Essential Skills & Experience Backend Strong commercial experience with: C# .NET/.NET Core ASP.NET Core REST API development SQL Server Frontend Strong experience with: React TypeScript JavaScript HTML5 CSS3 Cloud & DevOps Strong Azure experience CI/CD pipelines Infrastructure and deployment ...

Rightangle Developer - Inside IR35 - Up to £750 per day - Hybrid in Central London

Hiring Organisation
Hunter Bond
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
GBP Daily
commodity scheduling, logistics, inventory or physical settlement processes. Experience with market data, risk and P&L integration. Experience with Java, Spring/Spring Boot, REST APIs, Kafka or similar enterprise technologies . CI/CD and DevOps experience. Previous experience within a major investment bank or financial institution. Key Competencies ...

Rightangle Developer - Inside IR35 - Up to £750 per day

Hiring Organisation
Hunter Bond
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
GBP Daily
commodity scheduling, logistics, inventory or physical settlement processes. Experience with market data, risk and P&L integration. Experience with Java, Spring/Spring Boot, REST APIs, Kafka or similar enterprise technologies . CI/CD and DevOps experience. Previous experience within a major investment bank or financial institution. Key Competencies ...

Senior Frontend Developer

Hiring Organisation
Rullion Managed Services
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
£650 - £700/day
Query SWR Apollo Client UI & Design Systems Tailwind CSS Styled Components Material UI (MUI) Radix UI Framer Motion Custom Design Systems APIs & Data GraphQL REST APIs Contentful CMS React Hook Form Zod Testing Vitest Jest Testing Library Playwright Storybook MSW Axe/Pa11y DevOps & Infrastructure AWS Terraform GitLab CI Vercel ...

Integration Developer

Hiring Organisation
GCS
Location
Enfield, London, Enfield Town, United Kingdom
Employment Type
Contract
Contract Rate
£600 - £700/day
SSMS SSIS Azure Service Bus Azure Functions Strong SQL and T-SQL development skills. Experience designing and supporting ETL solutions. Hands-on experience with REST and SOAP integrations. Strong knowledge of: JSON XML Data Mapping Data Transformation API Integrations Experience troubleshooting and supporting production integration services. Experience working within Agile ...

SC Cleared QA SDET

Hiring Organisation
ARM
Location
City of London, London, United Kingdom
Employment Type
Contract
Contract Rate
£500 - £540/day Inside IR35 (Negotiable rate)
passion for quality. Preferred Qualifications Salesforce certifications (e.g., Salesforce Administrator, Platform App Builder) are a plus. Experience with API testing tools (Postman, REST Assured) is desirable. Understanding of enterprise-level integration testing. Disclaimer: This vacancy is being advertised by either Advanced Resource Managers Limited, Advanced Resource Managers IT Limited ...

Build & Deployment Engineer

Hiring Organisation
Deerfoot Recruitment Solutions Limited
Location
City of London, London, Coleman Street, United Kingdom
Employment Type
Contract
understanding of .NET Framework and modern .NET build and deployment - this is essential Practical experience with Visual Studio, MSBuild, NuGet, IIS, Windows services and REST APIs Administration or engineering experience with at least two of: Octopus Deploy, TeamCity, GitHub Enterprise, JFrog Artifactory, JFrog Xray, Azure DevOps Server Strong PowerShell, plus ...

Senior Developer Consultant (iPaaS & Automation)

Hiring Organisation
TXP
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
£0.00 - £495 per day
solutions within highly regulated or secure environments. Exposure to cloud transformation or enterprise modernisation programmes. Technical Skills Development Technologies C# Azure Functions Rust (desirable) REST APIs Enterprise Integration Technologies Microsoft Azure Azure Automation Azure Functions Azure Services & Integration Components Hybrid Cloud Environments Automation & Scripting PowerShell PowerShell Runbooks Automation Frameworks Workflow ...

Senior AI Platform Engineer - MCP AWS Agentic AI

Hiring Organisation
Method-Resourcing
Location
London, United Kingdom
Employment Type
Contract
Context Protocol (MCP), including MCP servers, gateways or tool integrations. Experience integrating LLMs, AI agents and agentic workflows into production applications. Strong understanding of REST APIs, service integration, authentication, authorisation and secure software development. Experience taking ownership of complex engineering projects, making architectural decisions and mentoring other engineers. Desirable: Python ...

Senior Backend Developer (Java / Spring Boot / AWS)

Hiring Organisation
Sanderson Recruitment
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
£500 - £600 per day
build and maintain cloud-based services on AWS. The work is hands-on and includes code reviews and input into technical decisions. Responsibilities: Build REST and event-driven microservices in Java and Spring Boot Deploy and support services on AWS (e.g. ECS/EKS, Lambda, RDS, DynamoDB, SQS/ ...

IAM Security Engineer

Hiring Organisation
Sanderson Recruitment
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
£400 - £450 per day
Terraform and/or CloudFormation. Proficiency in Python, Go or Java. Experience with automated testing frameworks such as pytest, Behave or JUnit. Knowledge of REST/SOAP APIs, DevOps practices and CI/CD delivery. Previous experience within financial services or a large-scale enterprise environment. ...

Full Stack Developer

Hiring Organisation
CBSbutler Holdings Limited trading as CBSbutler
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
£500 - £525/day
Python (Flask) on the backend and JavaScript (React) on the frontend. Key skills: Strong Python development experience Hands-on experience with Flask JavaScript & React REST API development and integration Full-stack application development Agile development experience Active SC Clearance - must be held by the Home Office or another government body ...

Full Stack Developer

Hiring Organisation
Experis
Location
City of London, London, United Kingdom
Employment Type
Contract
Contract Rate
£600 - £630/day
inside IR35 - Umbrella only Required skills Azure experience including Functions, App Services, Key Vault, Monitor, and general cloud native design. C#, .NET 10, REST API development, and enterprise backend engineering. Frontend development with TypeScript, JavaScript or NHS Digital Design System components. Confident and experienced use of AI development agents ...

Murex Risk Developer

Hiring Organisation
ARM
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
£60 - £63/hour
Technical Skills Strong experience with several of the following: * SQL* Oracle/relational databases * Unix/Linux * Shell scripting * Python * Java * XML/JSON * REST APIs/integration technologies * Git or equivalent source-control tools * CI/CD and DevOps processes * Batch scheduling/enterprise schedulers Strong SQL and Unix ...

Network Architect Data Centre / Automation

Hiring Organisation
Flint Technology Services
Location
East London, London, United Kingdom
Employment Type
Contract
EVPN-VXLAN and multi-site EVPN architecture, including live production migration design and rollback within constrained change windows. Python for production-quality automation and REST API integration (e.g. NDFC, ServiceNow, Infoblox, Red Hat AAP, Sentinel, Vault), including use of Python data structures to model intent and state. YAML data modelling ...

Senior C# .Net Developer

Hiring Organisation
ARM
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
£500/day Umbrella Inside IR35
application modernisation and cloud adoption. Mandatory Skills Strong commercial C#/.NET development experience .NET Core/.NET 6+ ASP.NET Core/Web API REST APIs and microservices SQL Server, including complex queries, stored procedures and optimisation Entity Framework/ORM Object-oriented design and design patterns Distributed systems …/Angular Cloud-native development Application observability and performance engineering DevSecOps and secure coding Preferred Stack C# | .NET Core/.NET 8 | ASP.NET Core | REST APIs | SQL Server | Entity Framework | Azure | Azure DevOps | Git | Docker | Kubernetes | Kafka | Redis | JSON/XML | Swagger/OpenAPI Disclaimer: This vacancy is being advertised ...

Python Django Developer

Hiring Organisation
Invitise Ltd
Location
City of London, London, United Kingdom
Employment Type
Contract, Work From Home
Contract Rate
£720 per day
need to hold or be eligible to obtain SC clearance for this role. Interested? Please apply below. Lead Software Engineer, Technical Lead, Python, Django, REST APIs, System Design, Software Architecture, TDD, Agile, GDS, London, Manchester, Birmingham, Cardiff, Hybrid/Remote, Contract, Inside IR35 ...

Solution Architect - Banking & Payments

Hiring Organisation
Gazelle Global Consulting Ltd
Location
London, United Kingdom
Employment Type
Contract
ensure solutions are secure, scalable, resilient and ready for production. Key Skills & Experience Enterprise solution architecture within banking, cards, payments or core-banking integration. REST/SOAP APIs, microservices, event-driven architecture and batch integration. Java and Spring Boot ecosystems. Google Cloud Platform (GCP), Kubernetes and hybrid-cloud environments. ...

iOS Developer

Hiring Organisation
Korn Ferry
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
GBP 400 Daily
Skills & Experience Strong commercial experience developing native iOS applications. Excellent knowledge of Swift and exposure to Objective-C. Experience with UIKit, MVVM architecture and REST API integrations. Familiarity with build and CI/CD tooling. Experience with automated testing frameworks. Strong debugging, problem-solving and performance optimisation skills. Ability ...

Integration Developer (SSIS Package Integration) - SC Active

Hiring Organisation
GCS
Location
Enfield, London, Enfield Town, United Kingdom
Employment Type
Contract
Contract Rate
£550 - £600/day
Azure Data Factory, SSIS, Logic Apps Proficiency in programming languages such as SQL. Strong understanding of data formats, protocols, and standards (e.g., JSON, XML, REST, SOAP). Excellent problem-solving skills and attention to detail with a focus on delivering high-quality integration solutions. Strong communication and interpersonal skills with ...