51 to 75 of 124 API Design Jobs in the UK

experienced engineer who enjoys solving complex problems, writing clean and efficient code, and mentoring others to uphold best practices in software engineering. You will have experience with – Backend Development: Design, develop, and maintain backend services using Node.JS Messaging & Asynchronous Workflows: Build and manage reliable messaging patterns using queues such as RabbitMQ and Pub/Sub patterns. Database Design: Develop efficient and scalable queries and schemas using PostgreSQL. API Design: Develop clean, RESTful APIs and contribute to internal and external API documentation. Containerisation: Aid in building services in containerised environments using Docker. Code Quality: Write testable, maintainable code and contribute to peer reviews, testing, and CI/CD pipelines. Who are we? CLEO Systems is More ❯

have the opportunity to work across a modern engineering environment, collaborate with agile product teams, and contribute to a high-traffic platform used by millions of customers. Key Responsibilities: Design, build, and maintain scalable, high-performance services using Kotlin or Java Provide technical leadership and mentoring to other engineers in the team Contribute to solution architecture and strategic technical … Skills & Experience 5+ years of back-end development experience using Kotlin or modern Java Expertise in microservice architectures and frameworks like Spring Boot or http4k Deep understanding of RESTful API design and integration Proven experience mentoring engineers and contributing to high-performing teams Familiarity with Agile (Scrum or Kanban), TDD, and pair programming practices Experience with CI/ More ❯

have real influence on architecture, performance, and delivery. What You'll Be Working With: Azure services such as Functions, Event Grid, Service Bus, SQL, Blob Storage, and DevOps pipelines API design, documentation (OpenAPI/Swagger), and integration with external partners Hands-on coding in C# .NET or Python (with opportunities to explore Node.js/Java) Building and optimising More ❯

adapt to evolving requirements Collaborate with stakeholders, vendors, and development teams Ensure non-functional requirements are met (e.g. security, scalability, performance) Support agile delivery and architectural runway planning Lead design reviews and resolve technical impediments Required Skills: Deep domain expertise in Corporate Payments (essential) and related financial services Strong experience in API design , microservices , and integration platforms More ❯

adapt to evolving requirements Collaborate with stakeholders, vendors, and development teams Ensure non-functional requirements are met (e.g. security, scalability, performance) Support agile delivery and architectural runway planning Lead design reviews and resolve technical impediments Required Skills: Deep domain expertise in Corporate Payments (essential) and related financial services Strong experience in API design , microservices , and integration platforms More ❯

agile development team seeking to leverage document processing and ML to realise new automation opportunities for the organisation. Enhance and expand automation services using OCR, Object Detection and LLMs. Design, develop, and support system components and operational services. Conduct research and spikes to extend automation capabilities. Ensure high-quality, maintainable, and accessible software through testing, code quality tools, and … debugging. Data Processing: Proficient with Pandas, NumPy, SQLAlchemy/psycopg2, AWS Boto3. Cloud & Infrastructure: Hands-on AWS (Lambda, S3, CloudWatch, IAM, CDK, SQS, EKS/ECS/Kubernetes). API Development: FastAPI, REST API design, external integrations, authentication (JWT/OAuth). Software Engineering: Building production AI/ML systems, collaborative development, service/serverless architectures. Development More ❯

Job Description Core Purpose To lead the technical design, development, and delivery of the Originate SaaS suite of products while aligning engineering execution with business goals, ensuring scalability, security, reliability, and maintainability. Your contribution Key Responsibilities 1. Technical Leadership • Architect secure, high-availability systems with compliance in mind (e.g., PCI DSS, SOC 2, ISO 27001). • Ensure robust encryption … audit trails, and access control mechanisms. • Guide backend design for high-volume transactional systems (e.g., ledgers, payments, identity verification). 2. Product Collaboration • Work closely with Product Managers to understand business goals and translate them into technical requirements. • Provide effort estimates and feasibility assessments for new features. • Influence product roadmap with technical insights and constraints. • Proactively address technical debt … of ownership, collaboration, and continuous improvement. • Lead sprint planning, daily stand-ups, and retrospectives (in Agile environments). 4. Delivery Ownership • Own the full lifecycle of product features-from design to deployment and maintenance. • Ensure on-time delivery by identifying and mitigating risks early. • Champion CI/CD practices and ensure smooth, automated deployment pipelines. 5. Reliability, Security, and More ❯

hybrid Neuro-Symbolic AI model. You will be part of a fast-moving agile team that ships production code regularly and values engineering excellence and continuous learning. You will: Design, develop, and maintain scalable features for the platform Work across our frontend (React) and backend (Node.js, Go) codebases while exercising autonomy in technical decision-making and task prioritisation Contribute … to DevOps practices, improving CI/CD pipelines and IaC deployment processes Collaborate with product and design functions to deliver intuitive user experiences Participate in code reviews and architecture discussions to uphold engineering best practices Help troubleshoot platform issues and assist in resolving infrastructure incidents Continuously seek ways to improve system performance, stability, and security Support internal innovation, including … agile environments Ability to work independently and take ownership of tasks from start to finish Preferred Experience 3+ years of professional software engineering experience Familiarity with GraphQL, gRPC, REST API design Experience with relational databases such as MySQL or PostgreSQL Exposure to AI, LLM integrations, or symbolic/neural hybrid systems Background in enterprise SaaS delivery or platform More ❯

and mobile platforms Integrate with PC and mobile apps that sync with the client's hardware devices Drive DevOps best practices across CI/CD pipelines, monitoring, and deployment Design and maintain a cybersecurity-first architecture, including penetration testing Optimise an Azure-based infrastructure for high availability and cost efficiency Collaborate with cross-functional teams to deliver impactful new … features Shape the design of future products, including AI and data modelling initiatives Tech Stack Web: ASP.NET Core, C#, JavaScript, HTML/CSS PC: C#, XAML, USB-MTP Mobile: Cordova (iOS & Android) Cloud: Microsoft Azure, CI/CD pipelines, version control, automated testing Security: Secure coding, authentication, penetration testing Hardware: Industry-leading devices, digitally integrated What They are Looking … who thrives in collaboration and is excited about building systems with real-world impact. Key Skills: Strong experience with C#, ASP.NET Core, JavaScript, HTML/CSS Expertise in RESTful API design and integration An eye for UX/UI design and brand-consistent interfaces Knowledge of DevOps practices (CI/CD, version control, automation) Hands-on experience More ❯

and mobile platforms Integrate with PC and mobile apps that sync with the client's hardware devices Drive DevOps best practices across CI/CD pipelines, monitoring, and deployment Design and maintain a cybersecurity-first architecture, including penetration testing Optimise an Azure-based infrastructure for high availability and cost efficiency Collaborate with cross-functional teams to deliver impactful new … features Shape the design of future products, including AI and data modelling initiatives Tech Stack Web: ASP.NET Core, C#, JavaScript, HTML/CSS PC: C#, XAML, USB-MTP Mobile: Cordova (iOS & Android) Cloud: Microsoft Azure, CI/CD pipelines, version control, automated testing Security: Secure coding, authentication, penetration testing Hardware: Industry-leading devices, digitally integrated What They are Looking … who thrives in collaboration and is excited about building systems with real-world impact. Key Skills: Strong experience with C#, ASP.NET Core, JavaScript, HTML/CSS Expertise in RESTful API design and integration An eye for UX/UI design and brand-consistent interfaces Knowledge of DevOps practices (CI/CD, version control, automation) Hands-on experience More ❯

and mobile platforms Integrate with PC and mobile apps that sync with the client's hardware devices Drive DevOps best practices across CI/CD pipelines, monitoring, and deployment Design and maintain a cybersecurity-first architecture, including penetration testing Optimise an Azure-based infrastructure for high availability and cost efficiency Collaborate with cross-functional teams to deliver impactful new … features Shape the design of future products, including AI and data modelling initiatives Tech Stack Web: ASP.NET Core, C#, JavaScript, HTML/CSS PC: C#, XAML, USB-MTP Mobile: Cordova (iOS & Android) Cloud: Microsoft Azure, CI/CD pipelines, version control, automated testing Security: Secure coding, authentication, penetration testing Hardware: Industry-leading devices, digitally integrated What They are Looking … who thrives in collaboration and is excited about building systems with real-world impact. Key Skills: Strong experience with C#, ASP.NET Core, JavaScript, HTML/CSS Expertise in RESTful API design and integration An eye for UX/UI design and brand-consistent interfaces Knowledge of DevOps practices (CI/CD, version control, automation) Hands-on experience More ❯

performant, and user-friendly features. This is a unique opportunity to shape the future of our platform and bring complex automation capabilities to life by collaborating closely with product, design, and AI engineering. Responsibilities Design, build, and maintain core application features in Next.js. Develop robust APIs and server components. Work on Supabase (PostgreSQL) data models, queries, and role … 5+ years of professional experience in full-stack development. Strong expertise in React and Next.js. Proficiency in TypeScript. Solid experience with SQL databases (PostgreSQL, Supabase) and ORMs. Knowledge of API design and modern state management (TanStack Query or similar). Understanding of authentication/authorization flows. Familiarity with automated testing and debugging complex workflows. The following is a More ❯

and scalable application development. This role is ideal for professionals who thrive in agile settings and are eager to continuously learn and evolve with the latest technology trends. Responsibilities Design, develop, and maintain scalable applications using Java, Spring, and Spring Boot Develop and manage RESTful APIs for seamless system integrations Collaborate with DevOps teams to build and optimize CI … IntelliJ IDEA Monitor, log, and troubleshoot applications using Splunk and log4j Participate in all Agile ceremonies, including sprint planning, daily stand-ups, reviews, and retrospectives Contribute to technical solution design by identifying development challenges and proposing effective strategies Ensure secure coding practices, including secrets management with tools such as HashiCorp Vault Work collaboratively across departments to ensure alignment with … hands-on experience in Spring and Spring Boot frameworks Experience in continuous integration and deployment tools, including Jenkins, Ansible, SonarQube, and Nexus Solid understanding of RESTful web services and API design principles Knowledge and practical use of secure development tools, particularly Vault Proficient in using GitHub for version control and IntelliJ IDEA as a development environment Familiarity with More ❯

the process from a candidate placement to onboarded contractor. This will then be extended to provide functionality to manage active placements, such as timesheets and expenses. This role will design, develop, test and support capabilities in our digital experience platform to create competitive advantage for SThree, as part of a small software development team. About us SThree is the … markets: Recruiting highly skilled professionals and discovering life-changing jobs for the unsung heroes who will positively shape our future. What are the day-to-day tasks? Hands-on design, development and testing of solutions, adhering to SThree's architectural principles, policies, and guidelines. Work with business stakeholders to understand opportunities and to design solutions that deliver the … required outcomes. Work with other technology teams to design and deliver end-to-end capabilities. Integrate solutions with other systems in SThree's technology landscape, for example CRM and ERP systems. Provide support to users and resolve systems issues. Configure CICD pipelines to support continuous delivery. Maintain infrastructure-as-code to build environments and applications. Focus on automation across More ❯

someone with a solid understanding of backend architecture and a passion for clean, maintainable code. Key Responsibilities: Develop and maintain backend services using C#, ASP.NET Core, and .NET Framework Design and implement RESTful APIs and microservices Optimise application performance and scalability Collaborate with DevOps and infrastructure teams to support deployment and monitoring Work with SQL Server and other data … storage technologies Ensure code quality through unit testing and adherence to best practices Skills and Experience Required: Proven experience in backend development with the .NET ecosystem Strong understanding of API design, integration, and security Experience with cloud platforms (Azure preferred) Familiarity with CI/CD pipelines and containerisation (e.g., Docker) Excellent problem-solving skills and attention to detail More ❯

someone with a solid understanding of backend architecture and a passion for clean, maintainable code. Key Responsibilities: Develop and maintain backend services using C#, ASP.NET Core, and .NET Framework Design and implement RESTful APIs and microservices Optimise application performance and scalability Collaborate with DevOps and infrastructure teams to support deployment and monitoring Work with SQL Server and other data … storage technologies Ensure code quality through unit testing and adherence to best practices Skills and Experience Required: Proven experience in backend development with the .NET ecosystem Strong understanding of API design, integration, and security Experience with cloud platforms (Azure preferred) Familiarity with CI/CD pipelines and containerisation (e.g., Docker) Excellent problem-solving skills and attention to detail More ❯

on engineer who enjoys leading by example , thrives in agile environments , and is passionate about shaping engineering best practice while still contributing to the codebase. Key Responsibilities Lead the design, development, and testing of secure, scalable systems using Python or Java with modern front-end frameworks (e.g., React) Architect and maintain APIs, data pipelines, and cloud-native solutions (AWS … Python or Java , with strong full-stack engineering skills Proven experience leading teams or projects at a senior/principal level Strong knowledge of system architecture , cloud solutions, and API design Familiarity with DevOps tools and automation (CI/CD, containers, IaC) Track record of delivering secure, production-grade systems in agile teams Excellent stakeholder engagement, influencing, and More ❯

on engineer who enjoys leading by example , thrives in agile environments , and is passionate about shaping engineering best practice while still contributing to the codebase. Key Responsibilities Lead the design, development, and testing of secure, scalable systems using Python or Java with modern front-end frameworks (e.g., React) Architect and maintain APIs, data pipelines, and cloud-native solutions (AWS … Python or Java , with strong full-stack engineering skills Proven experience leading teams or projects at a senior/principal level Strong knowledge of system architecture , cloud solutions, and API design Familiarity with DevOps tools and automation (CI/CD, containers, IaC) Track record of delivering secure, production-grade systems in agile teams Excellent stakeholder engagement, influencing, and More ❯

on engineer who enjoys leading by example , thrives in agile environments , and is passionate about shaping engineering best practice while still contributing to the codebase. Key Responsibilities Lead the design, development, and testing of secure, scalable systems using Python or Java with modern front-end frameworks (e.g., React) Architect and maintain APIs, data pipelines, and cloud-native solutions (AWS … Python or Java , with strong full-stack engineering skills Proven experience leading teams or projects at a senior/principal level Strong knowledge of system architecture , cloud solutions, and API design Familiarity with DevOps tools and automation (CI/CD, containers, IaC) Track record of delivering secure, production-grade systems in agile teams Excellent stakeholder engagement, influencing, and More ❯

on engineer who enjoys leading by example , thrives in agile environments , and is passionate about shaping engineering best practice while still contributing to the codebase. Key Responsibilities Lead the design, development, and testing of secure, scalable systems using Python or Java with modern front-end frameworks (e.g., React) Architect and maintain APIs, data pipelines, and cloud-native solutions (AWS … Python or Java , with strong full-stack engineering skills Proven experience leading teams or projects at a senior/principal level Strong knowledge of system architecture , cloud solutions, and API design Familiarity with DevOps tools and automation (CI/CD, containers, IaC) Track record of delivering secure, production-grade systems in agile teams Excellent stakeholder engagement, influencing, and More ❯

.NET Core/C# and modern web frameworks like Angular/TypeScript Hands-on experience with LLM APIs (OpenAI, Claude, Bedrock), LangChain, or RAG-based architectures Deep familiarity with API design, microservices, and cloud-first development (AWS, Azure, or GCP) Experience building systems with MongoDB, SQL, or vector databases like Pinecone or MongoDB Atlas Vector Search Solid engineering More ❯

production-ready code Ensure system robustness, resilience, and stability Develop and maintain a fit-for-purpose automated test suite Produce comprehensive technical documentation for wider consumption Contribute to the design of larger systems as part of a team Collaborate across teams, working with Lead Engineers and Technical Architects to explore technical solutions Review specifications with colleagues and apply agreed … standards and tools to design, code, test, correct and document programmes of medium to high complexity As a Java Developer you will have the following experience: Strong knowledge of software engineering best practices Hands-on experience with functional and non-functional testing Skilled in developing and maintaining automated test suites Experience with Java (11/17/21) and … the Spring Boot framework Knowledge of microservice architecture and API design principles Understanding of TDD and BDD principles Experience with CI/CD pipelines (GitLab CI desirable) Familiarity with Docker and containerisation (Kubernetes/EKS desirable) Ability to work in Agile delivery environments Knowledge of Kafka SC Security Clearance - Active More ❯

the Software Engineering group. In addition to contributing to feature development, you will play a role in shaping the technology and process strategies, and occasionally lead innovation or software design initiatives. Key Responsibilities: Develop new features with a strong focus on high-quality code. Conduct peer code reviews to ensure quality and adherence to best practices. Participate in daily … organization's objectives. Work closely with tech leads, engineers, testers, and other personnel to deliver high-quality products. Take ownership of initiatives related to innovation or addressing technical debt. Design, document, and communicate system solutions with a balanced focus on time, quality, cost, and performance. Collaborate with colleagues across the organization to gain buy-in and feedback on proposals … Required Knowledge & Experience: Essential: Strong proficiency in C# at a commercial level. Solid experience with .NET Core and related open-source technologies. Knowledge of Object Orientation, SOA, and relevant design patterns. Experience with modern software development practices, including agile methodologies , version control, code reviews, and continuous integration. Understanding of concurrency, asynchrony, and parallelism. Experience with Test Driven Development (TDD More ❯

the Software Engineering group. In addition to contributing to feature development, you will play a role in shaping the technology and process strategies, and occasionally lead innovation or software design initiatives. Key Responsibilities: Develop new features with a strong focus on high-quality code. Conduct peer code reviews to ensure quality and adherence to best practices. Participate in daily … organization's objectives. Work closely with tech leads, engineers, testers, and other personnel to deliver high-quality products. Take ownership of initiatives related to innovation or addressing technical debt. Design, document, and communicate system solutions with a balanced focus on time, quality, cost, and performance. Collaborate with colleagues across the organization to gain buy-in and feedback on proposals … Required Knowledge & Experience: Essential: Strong proficiency in C# at a commercial level. Solid experience with .NET Core and related open-source technologies. Knowledge of Object Orientation, SOA, and relevant design patterns. Experience with modern software development practices, including agile methodologies , version control, code reviews, and continuous integration. Understanding of concurrency, asynchrony, and parallelism. Experience with Test Driven Development (TDD More ❯

Integration Engineer , you'll work across data pipelines, APIs, and backend services to ensure data flows securely and seamlessly between systems. You'll collaborate with cross-functional teams to design and deliver scalable integration solutions that support critical mission capabilities. Key Responsibilities Design, develop, and maintain integrations between internal systems and third-party platforms using APIs and secure … integration architecture and practices. Key Skills & Experience Experience with workflow orchestration tools (e.g., Apache Airflow). Proven backend development skills using Node.js, Python, Java, or similar. Strong understanding of API design and integration techniques (REST, Webhooks, GraphQL). Familiarity with authentication protocols (OAuth2, JWT). Experience with ETL/ELT frameworks and data pipeline tools. Solid understanding of More ❯