Contract API Design Jobs in the South East

8 of 8 Contract API Design Jobs in the South East

SRE Engineer

London, South East, England, United Kingdom
Robert Walters
across teams. Success in this position requires not only technical proficiency but also excellent interpersonal skills to thrive in an environment that values teamwork, knowledge sharing, and mutual support. * Design, code, test, and deliver software enhancements aimed at improving existing systems by adopting DevOps principles across all cloud database offerings.* Troubleshoot complex incidents efficiently, communicate effectively with stakeholders at … is advantageous for scaling operations smoothly.* Knowledge of leveraging APIs securely along with authentication mechanisms and data structures enhances your ability to integrate systems seamlessly.* Understanding microservice architectures, REST API design/development principles, Docker/Kubernetes containerisation technologies, and CI/CD integration is beneficial. Robert Walters Operations Limited is an employment business and employment agency and More ❯
Employment Type: Contractor
Rate: £400 - £500 per day
Posted:

NET Developer

Hampshire, United Kingdom
Hybrid / WFH Options
Morris Sinclair Recruitment
Automotive Technology Solutions Client : Major automotive industry leader via global consultancy partnership Technical Requirements Backend Development C# .NET Framework/Core - Extensive experience developing robust, scalable backend services RESTful API Development - Design and implementation of web APIs Microservices Architecture - Understanding of distributed systems and service-oriented architecture Frontend Development Blazor - Proficiency in Blazor Server and/or Blazor … Strong experience including hooks, state management, and modern development practices JavaScript/TypeScript - Advanced knowledge of modern JavaScript and TypeScript HTML5/CSS3 - Solid understanding of web standards, responsive design, and cross-browser compatibility Database Technologies Oracle (Preferred) - Database development, PL/SQL, and performance optimization SQL Server (Alternative) - T-SQL and database design experience acceptable Entity Framework … driven development (TDD) Performance optimization and scalability techniques Content Management Systems knowledge Key Responsibilities Develop and maintain full stack applications using C# .NET backend with Blazor/React frontend Design and implement database solutions using Oracle/SQL Server Collaborate with cross-functional teams including UX/UI designers and business analysts Participate in code reviews and maintain high More ❯
Employment Type: Contract
Rate: GBP 300 - 375 Daily
Posted:

.NET Developer

Farnborough, Hampshire, England, United Kingdom
Hybrid / WFH Options
MORRIS SINCLAIR RECRUITMENT LTD
Automotive Technology Solutions Client : Major automotive industry leader via global consultancy partnership Technical Requirements Backend Development C# .NET Framework/Core - Extensive experience developing robust, scalable backend services RESTful API Development - Design and implementation of web APIs Microservices Architecture - Understanding of distributed systems and service-oriented architecture Frontend Development Blazor - Proficiency in Blazor Server and/or Blazor … Strong experience including hooks, state management, and modern development practices JavaScript/TypeScript - Advanced knowledge of modern JavaScript and TypeScript HTML5/CSS3 - Solid understanding of web standards, responsive design, and cross-browser compatibility Database Technologies Oracle (Preferred) - Database development, PL/SQL, and performance optimization SQL Server (Alternative) - T-SQL and database design experience acceptable Entity Framework … driven development (TDD) Performance optimization and scalability techniques Content Management Systems knowledge Key Responsibilities Develop and maintain full stack applications using C# .NET backend with Blazor/React frontend Design and implement database solutions using Oracle/SQL Server Collaborate with cross-functional teams including UX/UI designers and business analysts Participate in code reviews and maintain high More ❯
Employment Type: Contractor
Rate: £300 - £375 per day
Posted:

NET Developer

Farnborough, Cove, Hampshire, United Kingdom
Hybrid / WFH Options
Morris Sinclair Recruitment
Automotive Technology Solutions Client : Major automotive industry leader via global consultancy partnership Technical Requirements Backend Development C# .NET Framework/Core - Extensive experience developing robust, scalable backend services RESTful API Development - Design and implementation of web APIs Microservices Architecture - Understanding of distributed systems and service-oriented architecture Frontend Development Blazor - Proficiency in Blazor Server and/or Blazor … Strong experience including hooks, state management, and modern development practices JavaScript/TypeScript - Advanced knowledge of modern JavaScript and TypeScript HTML5/CSS3 - Solid understanding of web standards, responsive design, and cross-browser compatibility Database Technologies Oracle (Preferred) - Database development, PL/SQL, and performance optimization SQL Server (Alternative) - T-SQL and database design experience acceptable Entity Framework … driven development (TDD) Performance optimization and scalability techniques Content Management Systems knowledge Key Responsibilities Develop and maintain full stack applications using C# .NET backend with Blazor/React frontend Design and implement database solutions using Oracle/SQL Server Collaborate with cross-functional teams including UX/UI designers and business analysts Participate in code reviews and maintain high More ❯
Employment Type: Contract
Rate: £300 - £375/day
Posted:

Java Software Engineer Java, Integration, Kafka

London, South East, England, United Kingdom
Hybrid / WFH Options
Become
and production-grade digital solutions for the financial services sector. This is a hands-on engineering role ideal for someone with deep expertise in Java, Spring Boot, and secure API design , and who thrives in fast-paced, client-facing environments. The successful candidate will play a key role in shaping backend architecture, driving secure service delivery, and contributing … to engineering standards across engagements. Key Responsibilities Design and develop backend services using Java and Spring Boot Architect and implement secure APIs using OAuth2, FAPI, OpenID Connect Ensure backend services are performant, scalable, and resilient Collaborate with frontend, DevOps, and QA teams to deliver integrated solutions Participate in architecture reviews, technical design sessions, and stakeholder workshops Champion modern … architectures and messaging systems (e.g., Kafka) Exposure to Infrastructure as Code (e.g., Terraform, Ansible) Familiarity with observability tools and performance tuning Ability to mentor junior engineers and lead backend design initiatives Engagement Model Outside IR35 12-month initial contract with potential for extension or permanent employment Hybrid working model: minimum 2 days onsite in London, with flexibility to travel More ❯
Employment Type: Contractor
Rate: £600 - £650 per day
Posted:

API Integration Developer

London, South East, England, United Kingdom
Hybrid / WFH Options
Tenth Revolution Group
About the Job:In this contract role, you will design, develop, deploy, and document secure and functional APIs that integrate Employment Hero's HR and Payroll modules with third-party client platforms (such as timesheet and finance systems). You'll work day-to-day with our clients and partners, acting as the technical expert who architects API solutions based on client requirements and Employment Hero's documentation. You will manage the full API lifecycle, liaise with third-party vendors, contribute to solution design workshops, and ensure the integration meets performance, security, anddocumentation standards. Your work will make a direct impact by enabling clients to use automated HR and Payroll processes efficiently. Responsibilities and Duties … API Solution Design & Development Architect and implement secure, scalable RESTful APIs to integrate Employment Hero with external platforms Implement OAuth 2.0 and token-based authentication for API access. Manage the API lifecycle including testing, deployment, version control, logging, and monitoring. Use Python (e.g. FastAPI) and Azure services (e.g. Azure Functions, Microsoft Fabric pipelines) for development and More ❯
Employment Type: Contractor
Rate: £300 - £400 per day
Posted:

Lead Software Developer - OutsideIR35 - Wealth Manager - London

London, South East, England, United Kingdom
Oliver James
Key Responsibilities: Manage, mentor, and motivate a skilled development team across a broad tech stack. Design and develop scalable, secure, and high-quality software in line with architectural standards. Uphold and enhance coding and testing standards through peer reviews and automated/manual testing. Lead initiatives to improve efficiency, reduce technical debt, and modernise systems. Collaborate with Delivery/… improvement. Skills: Relevant degree or equivalent experience. Expert-level proficiency in: .NET Core , C# , Angular , Azure Cloud Terraform , Azure Container Apps , Azure Data Factory , DataVerse SQL Server (T-SQL) , API Design & Development Strong analytical skills with the ability to solve complex technical issues. Proven leadership with excellent stakeholder engagement at all levels. Experience in Agile methodologies. Adaptable and More ❯
Employment Type: Contractor
Rate: Salary negotiable
Posted:

Product Manager - B2B - Wallet to bank open loop

London, South East, England, United Kingdom
Hydrogen Group
lead the development of a new wallet-to-bank payment experience for business customers. This role sits at the heart of their B2B payments innovation agenda, combining product strategy, API design, and a highly user-focused interface built into a global platform. Dual Workstreams: API-Led Payments Infrastructure New Wallet-to-Bank Experience Experience needed: 7+ years More ❯
Employment Type: Contractor
Rate: £800 - £825 per day
Posted:
API Design
the South East
10th Percentile
£426
25th Percentile
£453
Median
£500
75th Percentile
£529
90th Percentile
£564