15 of 15 Contract API Design Jobs

Kong API Gateway Specialist

Hiring Organisation
EUROPEAN SOFTWARE SOLUTIONS (UK) LIMITED
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
£450 per day
Summary We are seeking an experienced Kong API Gateway Specialist to lead the development, implementation, and governance of our enterprise API ecosystem. This role will be responsible for establishing API governance standards, designing and managing API lifecycle processes, and driving the adoption of best practices across … integration and middleware platforms. The ideal candidate will possess deep expertise in Kong API Gateway, API management, security, integration architecture, and governance frameworks. They will work closely with enterprise architects, development teams, security teams, and business stakeholders to ensure APIs are secure, scalable, reusable, and aligned with organisational ...

DLT Payments Solution Architect

Hiring Organisation
Fuel Recruitment
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
GBP 775 Daily
digital bonds, gilts and money market funds for its business, corporate and institutional customers. We are looking for a DLT Payments Solution Architect to design and deliver the architecture that connects public blockchains and tokenised money to a bank's core payments and event-driven platforms. You will shape … . You will: Define the end-to-end solution architecture for DLT-enabled payments, including stablecoin and GBTD use cases, from target-state design through to delivery. Design and govern the integration of public blockchains with the bank's core banking, payments, ledger and financial crime systems, covering ...

Integration Architect - Java, AWS, FS - OutsideIR35

Hiring Organisation
Sanderson Recruitment
Location
City of London, London, United Kingdom
Employment Type
Contract
Contract Rate
£550 - £600 per day + Outside IR35
connectivity across the clients core systems. Key Responsibilities: Own and evolve integration architecture aligned with enterprise standards Define and govern integration patterns across teams Design and deliver event-driven, API-first, and messaging solutions (NATS, REST) Lead end-to-end integration delivery, including hands-on development (Java/… Spring) Ensure scalable, cloud-native solutions on AWS Produce architecture artefacts (blueprints, contracts, ADRs) Guide teams on best practices, API governance, and event design Engage stakeholders and align cross-team integration efforts Primary Skills: Event-driven architecture and messaging systems (NATS, pub/sub, async patterns) API ...

Application Developer

Hiring Organisation
Experis
Location
Sheffield, South Yorkshire, United Kingdom
Employment Type
Contract
Contract Rate
£420 - £473/day
MUST BE ELIGIBLE FOR BPSS MUST BE PAYE THROUGH UMBRELLA We are looking for a highly skilled Application Developer with strong expertise in identity API development, data ingestion and transformation, and event-driven (Pub/Sub) architectures. This role focuses on building secure, scalable identity and access workflows across … APIs, Pub/Sub pipelines, and cloud-native applications. You will collaborate closely with tech leads, Cloud Security, DevOps, and Application Engineering teams to design and implement robust IAM automation, identity lifecycle workflows, and secure service integrations that support enterprise-level cloud and Identity operations. Key Responsibilities 1. Identity ...

Lead Azure Engineer

Hiring Organisation
Teksystems
Location
Sheffield, South Yorkshire, United Kingdom
Employment Type
Contract
Contract Rate
£400 - £550/day
Title: Azure Engineer Job Description This role leads the design and delivery of cloud-native, full stack products on Microsoft Azure, running on Azure Kubernetes Service (AKS). You will be hands-on across the stack while setting technical direction, strengthening engineering standards, and ensuring solutions are secure, resilient … full stack delivery across React (TypeScript) front-end applications and Java/Python back-end services, including microservices and APIs. Own cloud-native solution design for AKS-based platforms, defining service boundaries, resilience patterns, scaling approaches, deployment strategies, and operational readiness. Design, build, and operate back-end services ...

Senior Integration Architect

Hiring Organisation
TXP
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
£700/day
teams, you will help shape the future integration strategy while ensuring high-quality, scalable, and maintainable solutions are delivered across the programme. Key Responsibilities Design and deliver integration solutions, migrating services from legacy platforms to modern strategic integration platforms. Define API specifications and integration patterns, including the transformation … legacy SOAP services into modern RESTful APIs. Apply API-first and domain-driven integration approaches to support reuse, resilience, and long-term maintainability. Contribute to end-to-end solution design, ensuring alignment with wider enterprise architecture principles and transformation objectives. Promote modern engineering practices including automated testing ...

Scala Engineer | SC Cleared | London | £620 pd

Hiring Organisation
Hays Technology
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
£620/day £620 per day (inside IR35)
services while supporting the ongoing evolution of the platform architecture. Key responsibilities Help define the future vision and consolidation strategy for Attribute Reputation services Design and develop scalable, secure and testable backend solutions Build and enhance REST APIs that deliver attribute insights to digital services Improve existing services … simplified technology stacks where appropriate Collaborate with product owners, business analysts, data engineers and wider teams to develop effective solutions Contribute to database design and application development with strong security and data protection principles Support operational excellence through monitoring, reliability and incident resolution Work within a continuous integration environment ...

API Gateway Engineer - Envoy

Hiring Organisation
Axiom Software Solutions Ltd
Location
Glasgow, Lanarkshire, United Kingdom
Employment Type
Contract
Contract Rate
GBP Annual
Title: API Engineer - Envoy Location: Glasgow, UK (Onsite) Type: Contract Job Description: We are looking for an API Engineer with experience in Envoy Proxy/Envoy Gateway , along with strong knowledge of cloud-native technologies, APIs, security, and DevOps tools. Required Skills: Programming languages: Advanced proficiency … more programming languages - Golang or Java. Cloud-native operations: Practical, hands-on cloud-native experience. ENVOY: Professional experience with Envoy Proxy or Envoy Gateway. API design: Strong understanding of the OpenAPI Specification (OAS) for RESTful APIs. Authentication & authorization: Hands-on experience implementing authentication and authorization at the gateway ...

Software Engineer - Backend Developer

Hiring Organisation
Randstad Digital
Location
Manchester, North West, United Kingdom
Employment Type
Contract
Contract Rate
£70 - £72 per hour
deployed via Kubernetes and AWS environments. Strong working knowledge of event-streaming tools like Apache Kafka or comparable messaging backbones. Deep understanding of RESTful API design, external integrations, distributed transaction handling, and canonical data models. solid grasp of TDD/automated testing, CI/CD pipelines, and active ...

Java Developer

Hiring Organisation
GCS
Location
Sheffield, South Yorkshire, United Kingdom
Employment Type
Contract
Contract Rate
£550 - £551/day
Required: Languages: Java 11+, HTML5, JavaScript Front-End Frameworks: Angular APIs: RESTful API Design Databases: Neo4j, PostgreSQL Testing: Junit, Mockito, Cucumber Building: Maven Tooling: GitHub, JIRA, Confluence, GitHub Copilot The Developer Experience (DevX) Standards and Controls function is building a platform for control owners and development teams … well as modernising the application and resolving dependency issues. YOUR RESPONSIBILITIES Collaborate with developers, testers and the wider organisation to build and run products Design, develop & implement back-end features as per backlog/priority with a small element of front-end development. Collaborate with the rest ...

Scala Data Engineer - Contract - SC Clearance - London

Hiring Organisation
CBSbutler Holdings Limited trading as CBSbutler
Location
London, United Kingdom
Employment Type
Contract
Contract Rate
£530 - £580/day insideIR35
Clearance to join a team developing secure, high-volume and highly available backend services and APIs supporting fraud detection and data integrity. Responsibilities: * Design and develop scalable, secure and low-latency backend services. * Develop clean, testable Scala code and REST APIs. * Work with databases and AWS services. * Improve … Support production services and contribute to incident resolution. * Work within an Agile & Continuous Integration. Skills and Experience: * Scala * Play Framework or MVC/REST API frameworks * SQL/Databases * AWS * Continuous Integration * Agile methodologies * API design and development * Testing and automation * Production support/SRE awareness ...

Senior .NET Developer

Hiring Organisation
Pontoon
Location
Bromley, London, United Kingdom
Employment Type
Contract
Contract Rate
£700 - £750/day Inside IR35
development role. You will be expected to have years of experience of commercial development experience utilising: TECHNICAL SKILLS: Deep functional knowledge or hands on design experience with Web Services (REST, SOAP, etc) Understanding of API design and documentation .NET 8.0/10 (C#) .Net CORE (C#) .NET … Framework 4.7+ Angular (v2+), JavaScript Net MVC 5.0 & Web Api 2 ORM (EntityFramework/nhibernate/Dapper) MS SQL Server 2008+, DB2 Dependency injection and frameworks, e.g. Unity Practical experience with TDD and CI/CD OTHER SKILLS: An aptitude for problem analysis and resolution and eye for details. ...

SC Cleared Senior Scala Engineer

Hiring Organisation
fortice
Location
United Kingdom
Employment Type
Contract
Contract Rate
GBP 620 Daily
Front End Attribute Reputation services (APIs) to Digital services to provide attribute insights for fraud detection and prevention across HMRC. This work involves: Help design a future vision for our Att Rep services, including consolidation, to allow us to provide a consistent and easy to use experience for users. … maintenance efforts through incremental re-architecting - eg reducing the number of technologies that are required to support the pipeline & using managed services where appropriate. Design and develop clean functioning, testable code on the Back End, write effective APIs, develop and manage well-functioning databases and applications with security ...

Senior Scala Engineer CGEMJP00355784

Hiring Organisation
Experis
Location
West End, London, Stratford and New Town, United Kingdom
Employment Type
Contract
Contract Rate
£590 - £637/day
Attribute Reputation services (APIs) to Digital services to provide attribute insights for fraud detection and prevention across the business. This work involves: Help design a future vision for our Att Rep services, including consolidation, to allow us to provide a consistent and easy to use experience for users. Consideration … maintenance efforts through incremental re-architecting - e.g. reducing the number of technologies that are required to support the pipeline & using managed services where appropriate. Design and develop clean functioning, testable code on the back-end, write effective APIs, develop and manage well-functioning databases and applications with security ...

Software Developer C and Linux

Hiring Organisation
System Recruitment
Location
Lymington, Hampshire, South East, United Kingdom
Employment Type
Contract
Contract Rate
£60,000
immediate requirement for an experienced C/Linux Software Developer. Key Skills: Software Developer, Software Engineer, C, Linux, Autotools, LDAP, Active Directory, Terraform, OpenTofu, API Location: Hybrid but must be able to reach the office near Lymington - SO41 9AZ Salary: £60,000 - £65,000 + benefits Essential Skills Experience … equitant system initialisation frameworks and how they operate at a low level Understanding of secure configuration delivery and deployment auditability of newly provisioned systems API Design & Implementation (maybe): Experience/Familiarity with: Working with OpenAPI (Swagger) specifications to define service interfaces Implementing APIs in C or similarly ...