1 to 25 of 28 API Design Jobs in London

integration layer behind a new generation of AI-powered products. This is a genuinely full-stack engineering role, combining production-grade backend development, API design, AI integrations and frontend engineering. You'll work across the full application lifecycle, designing the services and interfaces that connect AI capabilities … products customers and colleagues use every day. You'll play a key role in building MCP integrations, agent-to-agent connectivity and robust API services, while also developing responsive, accessible interfaces in React and TypeScript. What you'll be doing Own the application and integration layer of AI products ...

play a key part in driving the adoption of AI across engineering, leveraging emerging technologies and embedding AI-native workflows to improve how they design, build, and deliver software. This role is predominantly hands-on, with around 2030% of time on technical leadership: architecture, mentoring, and shaping … generated code to our standards for security, reliability, and cost-efficiency (FinOps). These are first-class concerns in agentic pipelines, not afterthoughts. Design, build, and operate software across our platform, applying the same rigour to AI-augmented work as to anything else you ship. Embed deeply with Product ...

lead the next phase of our technology transformation journey to create great products and services for the organisation. Main Responsibilities Responsible for the overall design and solution architectureinvolvinglargedata. Lead and maintain key design decisions and existing solution architecture documents. Demonstrate a Product delivery mindset, and drive capabilities … existing eCommerce and data infrastructure for scalability and expansion. Skills: Detailed knowledge and previous experience with AI and Claude. Strong understanding of architecture, discovery, design and delivery of Enterprise, Cloud and Security technologies, preferably in a Microsoft technology stack. C# .NET Core, REST API Design and Development ...

data services, and cloud platforms. You will own end-to-end integration architecture, champion modern engineering standards, and guide engineers through best practices in API design, cloud-native development, and scalable integration patterns. This is a hands-on leadership role, ideal for someone who enjoys coding, problem-solving … steering technical direction while mentoring engineers and collaborating with product, data, and platform teams. What You'll Be Doing Lead the design, development, and delivery of integration solutions across a diverse technology ecosystem Develop secure, scalable APIs, services, and messaging-based integrations Champion best practices in engineering, DevOps, automation ...

Minimum Qualifications 5+ years of experience in software engineering, solution design, or architecture roles Strong stakeholder management experience across business and technology domains Strong analytical and problem-solving capabilities Experience working in Agile organizations Bachelor's degree in Computer Engineering, Software Engineering, or a related discipline Fluent English communication … messaging technologies SQL and NoSQL databases Containerization (Docker) Kubernetes CI/CD pipelines Git-based development workflows Good understanding of: Distributed systems System integration API design Scalability patterns Roles and Responsibilities Backend Engineering Design and develop enterprise-grade Back End services using Java. Build APIs and microservices ...

consumers, topics, partitions and consumer groups Cloud: AWS application deployment and support DevOps: CI/CD pipeline implementation and automation Containers: Docker APIs: RESTful API design and development using C# with Open API standard Source Control: GitHub and Azure DevOps Production Engineering: Troubleshooting, monitoring, logging and performance … optimization Highly Desirable Amazon MSK or managed Kafka experience AWS EKS/ECS Terraform/AWS CloudFormation AWS Lambda, API Gateway, SQS, SNS and EventBridge Redis and distributed caching CloudWatch, ELK/OpenSearch, Datadog, Prometheus, Grafana or Splunk OAuth 2.0/JWT and API security AWS certification Experience ...

consumers, topics, partitions and consumer groups Cloud: AWS application deployment and support DevOps: CI/CD pipeline implementation and automation Containers: Docker APIs: RESTful API design and development using C# with Open API standard Source Control: GitHub and Azure DevOps Production Engineering: Troubleshooting, monitoring, logging and performance … optimization Highly Desirable Amazon MSK or managed Kafka experience AWS EKS/ECS Terraform/AWS CloudFormation AWS Lambda, API Gateway, SQS, SNS and EventBridge Redis and distributed caching CloudWatch, ELK/OpenSearch, Datadog, Prometheus, Grafana or Splunk OAuth 2.0/JWT and API security AWS certification Experience ...

health tech clients Integrations team, building secure, reliable payment capabilities for their platform, a cloud-based SaaS platform used across the UK. You'll design and deliver integrations with leading providers including Stripe, Dojo and Adyen, powering online payment links, card-present payments, and automated debt chasing. What … Build and maintain secure, resilient Java microservices and third-party integrations. Own services end to end: design, build, test, deploy, monitor and improve them in production. Shape technical decisions with Product, QA and your Team Lead. Coach junior developers and QA colleagues. What we're looking for 5+ years ...

Ireland providing specialist services to a wide range of blue-chip clients. The role We are seeking technical polyglots who enjoy both technical architectural design, hands-on coding and peer reviews, though also like the idea of the equally important social/client-facing aspect of the role. … development architecture as well as supporting business analysts and product owners in planning and story-mapping for new development. You will act as technical design authority (TDA) for delivery of technical stories and produce technical documentation artefacts to support the delivery process. Main Responsibilities Duties will include: The design ...

Senior .Net Developer, C#/VB.Net, API, SQL, NW London to £85K A Back End Developer is required to join this established financial software house based in North London. They work with some of the leading brands in retail and media, offering financial management systems developed in house … required with expertise in Visual Basic .NET, C#, SQL Server, and SAP Business One integration. The ideal candidate should have strong skills in RESTful API development, database optimization, and Azure DevOps pipeline management. Knowledge of API security, CI/CD automation, and Swagger documentation is recommended. Responsibilities API ...

SPONSORED Location: London Our client is looking for an experienced Java Developer with active SC clearance . You'll join their team to design, build and maintain RESTful and SOAP microservices using Spring Boot in an Agile environment. As a Java Developer, you will be responsible for designing, developing … preferably should have SC/DV clearance or must be eligible and willing to go through SC/DV clearance. What you'll do Design, develop and deploy RESTful and SOAP microservices using Spring Boot Work with cross-functional teams to analyse requirements and deliver features Write clean, well ...

sector clients, helping to deliver our client services to the highest standard. The role will involve working with multiple business stakeholders, helping them to design business solutions which will then be implemented by the delivery teams. As a Junior Solution Architect, you will undertake structured analysis of technical issues … translating this analysis into designs that describe a solution. You will be consulted on design and can provide design patterns. You will identify the deeper issues that need fixing and look for opportunities to collaborate and reuse components, communicating with both technical and non-technical stakeholders. You will ...

delivery of the platform, ensuring the team consistently ships high-quality, production-ready increments. Ensure engineering standards are followed across the team: coding conventions, API design, security practices, and code review processes. Lead estimation, sprint planning, and decomposition of technical work; proactively identify and manage technical risk, dependencies … architecture function, clearly articulating technical constraints, risks, or emerging complexity with architectural implications, supported by evidence and proposed alternatives. Ensure application of secure-by-design principles and validate and refine Figma wireframes. Represent the team's technical work clearly and credibly to non-technical audiences. Define and enforce ...

native adoption, and AI-assisted development practices. The Role As Lead Application Architect, you'll take ownership of application-level architecture and low-level design, helping to establish development standards and modern engineering practices across the organisation. Key responsibilities include: Producing component-level and code-level designs and detailed … Level Design (LLD) documentation Translating high-level architectural designs into clear implementation plans for development teams Creating and maintaining Architecture Decision Records (ADRs) and facilitating design reviews Defining and embedding engineering standards, coding principles, and security best practices Driving adoption of AI-assisted development tools across the software ...

works with top tier global financial institutions and major tech companies to offer our client products and services directly to their customers. Through our API, we help partners to architect and build integrations to our world class-leading international finance products, which in turn improves our client by increasing … turnaround times. Designing and developing innovative new features that expand the functionality of our client's services and exposing these features through the public API, enabling seamless integration with partner systems and empowering them to leverage the full potential of our client's platform. Diagnosing and resolving complex technical ...

security etc). Working within a project management/agile delivery methodology Experience in technical ownership for a product or software solution, covering design, estimation, shaping and user story/requirement creation Documentation of solutions (e.g. architecture, configuration, release, support-handover Collaborate and liaise with other our client … including microservices and message-driven architectures NFR/Non-Functional requirement understanding and experience developing applications with this in mind Application/Digital Services Design experience Experience in software engineering practices like Code Reviews, CI/CD Pipelines and SOLID/DRY principals Hands-on developing/coding role ...

teams to integrate security throughout the software development lifecycle. Microsoft Azure and KQL experience are essential , alongside relevant experience in CI/CD, Kubernetes, API security, security-as-code and security automation . This is a hands-on application security role focused on secure design, application security testing … Integrating security controls into CI/CD pipelines. Strengthening the security of GitHub Actions and similar CI/CD platforms. Providing guidance on secure API design and externally accessible systems. Supporting Azure cloud infrastructure, including Azure Kubernetes Service (AKS). Developing security-as-code and policy-as-code. ...

workflows at scale. This role emphasizes engineering excellence, operational readiness, and secure, compliant delivery in a fast-paced global environment. Job Responsibilities Lead the design and delivery of user interface capabilities across Execute, from discovery to production support Set front-end technical direction, including architecture, standards, performance, and testing … time or data-intensive user experiences Demonstrated technical leadership in setting standards, leading designs, and mentoring teams Solid software engineering fundamentals, including OO/design patterns, debugging, and documentation Familiarity with agentic development approaches across the software development lifecycle Strong communication skills and ability to work effectively in global ...

Java and Spring Boot Deploy and support services on AWS (e.g. ECS/EKS, Lambda, RDS, DynamoDB, SQS/SNS) Own services from design through to production support Maintain CI/CD pipelines and infrastructure as code (Terraform, CloudFormation or CDK) Review code and contribute to architecture decisions Essential … skills: Commercial experience with Java 21 and Spring Boot Building and running applications on AWS Microservices and API design Reasonable Adjustments: Respect and equality are core values to us. We are proud of the diverse and inclusive community we have built, and we welcome applications from people ...

following key skills: - At least three years commercial scala programming - Strong framework experience (Akka, Play etc) - Relational database experience - PostgreSQL - MongoDB, NoSQL - RESTful API design and integration experience - Solid unit test understanding - Spec2, scalaTest etc - Experience working in a TDD/BDD driven environment - Containerization experience - Docker, Kubernetes … well-established friendly team then please apply now to be considered and for further details. Scala Developer Up to £85,000 Scala, REST Api, NoSQL, TDD/BDD, functional programming, CI/CD, Play, Akka ...

following key skills: - At least three years commercial scala programming - Strong framework experience (Akka, Play etc) - Relational database experience - PostgreSQL - MongoDB, NoSQL - RESTful API design and integration experience - Solid unit test understanding - Spec2, scalaTest etc - Experience working in a TDD/BDD driven environment - Containerization experience - Docker, Kubernetes … well-established friendly team then please apply now to be considered and for further details. Scala Developer Up to £85,000 Scala, REST Api, NoSQL, TDD/BDD, functional programming, CI/CD, Play, Akka ...

Cloud and Order Management capabilities to support our clients retail and service operations. You will define technical standards, ensure best practices, and guide the design of integrated solutions that enhance customer experience and operational efficiency. Success in this role means delivering secure, scalable, and high-performing platforms that enable … solutions, ensuring alignment with enterprise standards. Collaborating with business and technical teams to translate requirements into scalable, secure, and high-performing solutions. Leading technical design sessions and providing guidance to development teams on best practices and integration patterns. Defining and maintaining architectural documentation, including data models, integration diagrams ...

modern app architectures like Unidirectional Data Flow, Dependency Injection, Structured Concurrency with Kotlin Coroutines, amongst others Desire to write testable code Understanding of REST API design Strong product mindset and passion for user experience, with a focus on prioritising work that addresses user needs and making data-driven ...

Account users. Collaboration is key to how we operate across the business in this role, and you will work alongside product, design, and analytics teams to create the best tools for our users, helping them manage their cross-currency needs with ease whilst shaping our Account offering. Being … build consistent experiences across our clients native applications and the web and enable features with a customer centric focus. Collaborate closely with product, design (UI), analytics, and other teams across the company to deliver impactful experiences to our client users as part of a cross-functional team. Take responsibility ...

core business systems. This is a hands-on development role working closely with other Developers, Business Analysts, Testers and Product Owners to design, build and support high-quality, maintainable software. In particular: Designing and developing robust Modern .Net (C#) and Angular solutions that support critical business processes Building well … knowing how to manage those risks. SKILLS REQUIRED You will be comfortable working in a collaborative development team, understanding business requirements, contributing to technical design decisions and delivering well-structured code that is reliable, maintainable and easy to support. You will be able to demonstrate: Strong commercial experience with ...