1 to 25 of 86 API Design Jobs in Central London

own the strategic architectural direction and implementation, ensuring our platform is scalable, secure, and aligned with the rapidly evolving AI landscape. Key Responsibilities Provide visionary architectural leadership for the design, development, and delivery of a new generation AI-driven SaaS platform. Lead, mentor, and manage a team of Senior Full-Stack Developers and engineers, fostering a culture of technical … Proven expertise in full-stack development using: TypeScript (and JavaScript frameworks such as NextJS, Node, or Tailwind) Python (including frameworks like Django, Flask, or FastAPI) PostgreSQL and relational database design, optimization, and maintenance. AI Development Tools such as Windsurf, Aider or Augment. Demonstrable experience building and scaling SaaS platforms in a production environment. Strong understanding and practical application of … experience integrating AI tools, APIs, or platforms into software solutions. Domain experience in Recruitment Technology, HRTech, or closely related fields is a must. Proficient in software architecture, microservices, RESTful API design, and cloud-native development (AWS, Azure, or GCP preferred). Experience with CI/CD pipelines, automated testing, and DevOps practices. Solid grasp of security best practices More ❯

own the strategic architectural direction and implementation, ensuring our platform is scalable, secure, and aligned with the rapidly evolving AI landscape. Key Responsibilities Provide visionary architectural leadership for the design, development, and delivery of a new generation AI-driven SaaS platform. Lead, mentor, and manage a team of Senior Full-Stack Developers and engineers, fostering a culture of technical … Proven expertise in full-stack development using: TypeScript (and JavaScript frameworks such as NextJS, Node, or Tailwind) Python (including frameworks like Django, Flask, or FastAPI) PostgreSQL and relational database design, optimization, and maintenance. AI Development Tools such as Windsurf, Aider or Augment. Demonstrable experience building and scaling SaaS platforms in a production environment. Strong understanding and practical application of … experience integrating AI tools, APIs, or platforms into software solutions. Domain experience in Recruitment Technology, HRTech, or closely related fields is a must. Proficient in software architecture, microservices, RESTful API design, and cloud-native development (AWS, Azure, or GCP preferred). Experience with CI/CD pipelines, automated testing, and DevOps practices. Solid grasp of security best practices More ❯

AI Agents Solution Architect - Future Talent (Q2/Q3 opportunities) for leading GSI in the software engineering market AI Solution Architect to design and implement AI-driven agent solutions for the online commerce space. Deep understanding of AI/ML models, cloud computing, and scalable system architecture. This role requires expertise in architecting intelligent agents, optimizing cloud-based deployments … and integrating AI services into enterprise applications. Key Responsibilities: Architect and design AI-powered agent solutions that integrate with enterprise systems and cloud platforms. Develop and optimize RESTful and GraphQL APIs to facilitate AI-driven interactions. Utilize AWS services (Lambda, S3, API Gateway, SageMaker, DynamoDB, ECS, etc.) to deploy scalable AI solutions. Implement Full Stack JavaScript (Node.js, React.js … Work closely with data scientists and ML engineers to integrate machine learning models into cloud-native applications. Ensure security, scalability, and reliability of AI agent solutions in production environments. Design event-driven and serverless architectures to enhance AI agent performance. Lead proof-of-concept (PoC) developments for AI-based automation and intelligent process optimization. Define best practices for AI More ❯

that support financial services and products. You should be able to write clean, scalable, and secure code and be comfortable working in a fastpaced, highly collaborative environment. Key Responsibilities: Design, develop, and maintain scalable web applications using Python and Django Build and optimise backend services, APIs, and database schemas for performance and scalability Work closely with product, design … expertise in Django framework Solid experience with SQL and/or PostgreSQL, including performance tuning and complex queries Prior experience in the FinTech industry is required Familiarity with RESTful API design and integration Understanding of data privacy, security standards, and regulatory compliance relevant to FinTech Experience with version control systems like Git Good communication skills and ability to More ❯

full-stack expertise and help us accelerate development across our entire technology stack. Key Responsibilities: Build and enhance our application Develop robust front-end interfaces and back-end services Design and implement scalable database systems and APIs Build and enhance our AI agents Optimize application performance and ensure system reliability Collaborate with product and engineering teams to deliver end … analytics and visualization tools Familiarity with vector databases and AI/ML integration Experience with LLM orchestration frameworks (LangChain, LangGraph, etc.) Financial domain knowledge or fintech experience Experience with API design and microservices architecture Background in data engineering or ETL processes Knowledge of monitoring, logging, and performance optimization Understanding of agent architectures and AI system integration Knowledge of More ❯

full-stack expertise and help us accelerate development across our entire technology stack. Key Responsibilities: Build and enhance our application Develop robust front-end interfaces and back-end services Design and implement scalable database systems and APIs Build and enhance our AI agents Optimize application performance and ensure system reliability Collaborate with product and engineering teams to deliver end … analytics and visualization tools Familiarity with vector databases and AI/ML integration Experience with LLM orchestration frameworks (LangChain, LangGraph, etc.) Financial domain knowledge or fintech experience Experience with API design and microservices architecture Background in data engineering or ETL processes Knowledge of monitoring, logging, and performance optimization Understanding of agent architectures and AI system integration Knowledge of More ❯

with containerisation (Docker/Kubernetes). Support implementation of authentication systems (OAuth 2.0, Auth0, AWS Cognito). Gain exposure to security best practices (e.g., OWASP). Work on RESTful API design and consumption. Collaborate on version control practices using Git, documentation, and code reviews. Desired Skills: Passion for software development and continuous learning. Some frontend experience with JavaScript … Python or Node.js. Understanding of databases (relational and NoSQL). Familiarity with cloud platforms (AWS/Azure) is a plus. Exposure to Docker/Kubernetes is advantageous. Understanding of API integration and security fundamentals. Experience or interest in OCR and NLP is beneficial. Knowledge of version control (e.g., Git). Education & Experience: Degree in computer science, software engineering, or More ❯

with containerisation (Docker/Kubernetes). Support implementation of authentication systems (OAuth 2.0, Auth0, AWS Cognito). Gain exposure to security best practices (e.g., OWASP). Work on RESTful API design and consumption. Collaborate on version control practices using Git, documentation, and code reviews. Desired Skills: Passion for software development and continuous learning. Some frontend experience with JavaScript … Python or Node.js. Understanding of databases (relational and NoSQL). Familiarity with cloud platforms (AWS/Azure) is a plus. Exposure to Docker/Kubernetes is advantageous. Understanding of API integration and security fundamentals. Experience or interest in OCR and NLP is beneficial. Knowledge of version control (e.g., Git). Education & Experience: Degree in computer science, software engineering, or More ❯

team are looking for a talented 3 Fullstack Engineers (React/Python) to join the growing team and contribute to the development of intelligent, scalable digital products. Key Responsibilities: Design, build, and maintain scalable fullstack web applications using React on the frontend and Python (Django/FastAPI/Flask) on the backend. Collaborate closely with data scientists, ML engineers … hands-on experience with React and modern JavaScript (ES6+) or TypeScript. Proficiency in Python , ideally with experience in web frameworks such as Django, FastAPI, or Flask. Strong understanding of API design, microservices, and web architecture. Experience with relational and NoSQL databases (e.g. PostgreSQL, MongoDB). Comfortable working with cloud services like AWS, Azure, or GCP. Familiarity with Docker More ❯

team are looking for a talented 3 Fullstack Engineers (React/Python) to join the growing team and contribute to the development of intelligent, scalable digital products. Key Responsibilities: Design, build, and maintain scalable fullstack web applications using React on the frontend and Python (Django/FastAPI/Flask) on the backend. Collaborate closely with data scientists, ML engineers … hands-on experience with React and modern JavaScript (ES6+) or TypeScript. Proficiency in Python , ideally with experience in web frameworks such as Django, FastAPI, or Flask. Strong understanding of API design, microservices, and web architecture. Experience with relational and NoSQL databases (e.g. PostgreSQL, MongoDB). Comfortable working with cloud services like AWS, Azure, or GCP. Familiarity with Docker More ❯

Microsoft developer to join the teams in London as Permanent or with 12 months FTC. Salary is up to £70k pa, hybrid. Main Duties & Responsibilities Include: Power Platform Development: Design, develop, and deploy custom applications using Power Apps, Power Automate, and Power BI, integrating with various data sources and systems. Azure Functions Integration: Create and manage serverless Azure Functions … to implement custom business logic, data processing, and API endpoints. Front-End Development: Build responsive and accessible user interfaces using modern JavaScript frameworks like React, Angular, incorporating the Fluent UI design system for a consistent and polished user experience. Ensure seamless interaction with Power Platform components and .NET Core applications. .NET Core Development: Develop and maintain robust APIs … Angular UI Framework: Experience with Fluent UI (or similar component library) Database Management: SQL Server, Azure Cosmos DB Cloud Architecture: Understanding of cloud concepts, Azure services, and best practices API Development: RESTful API, OData API design and implementation PowerShell Scripting: Experience in developing and maintaining PowerShell scripts for automation. Experience with packaging and deploying applications, including More ❯

Microsoft developer to join the teams in London as Permanent or with 12 months FTC. Salary is up to £70k pa, hybrid. Main Duties & Responsibilities Include: Power Platform Development: Design, develop, and deploy custom applications using Power Apps, Power Automate, and Power BI, integrating with various data sources and systems. Azure Functions Integration: Create and manage serverless Azure Functions … to implement custom business logic, data processing, and API endpoints. Front-End Development: Build responsive and accessible user interfaces using modern JavaScript frameworks like React, Angular, incorporating the Fluent UI design system for a consistent and polished user experience. Ensure seamless interaction with Power Platform components and .NET Core applications. .NET Core Development: Develop and maintain robust APIs … Angular UI Framework: Experience with Fluent UI (or similar component library) Database Management: SQL Server, Azure Cosmos DB Cloud Architecture: Understanding of cloud concepts, Azure services, and best practices API Development: RESTful API, OData API design and implementation PowerShell Scripting: Experience in developing and maintaining PowerShell scripts for automation. Experience with packaging and deploying applications, including More ❯

Engineer will be responsible for both frontend and backend development, ensuring seamless integration and high performance of web applications. Responsibilities Lead technical initiatives and projects, ensuring high-quality delivery. Design and implement complex software applications, emphasizing robust and scalable solutions. Collaborate with cross-functional teams to define, design, and ship new features. Ensure code quality and maintainability through … code reviews and adherence to design patterns. Optimize the performance of web applications to ensure fast and efficient user experiences. Mentor junior engineers and promote a culture of continuous learning and improvement. Address and refactor legacy code, bringing it up to modern standards and practices. Drive changes in coding practices and standards to improve code quality and team efficiency. …/large-sized projects, particularly in single-page applications (SPA) or back-office systems. Experience in optimizing the performance of web applications. Strong knowledge of software engineering principles and design patterns. Understanding of backend technologies, including Node.js, Express, or similar frameworks. 5+ years preferred. Experience with RESTful API design and development. Familiarity with database management systems such More ❯

Engineer will be responsible for both frontend and backend development, ensuring seamless integration and high performance of web applications. Responsibilities Lead technical initiatives and projects, ensuring high-quality delivery. Design and implement complex software applications, emphasizing robust and scalable solutions. Collaborate with cross-functional teams to define, design, and ship new features. Ensure code quality and maintainability through … code reviews and adherence to design patterns. Optimize the performance of web applications to ensure fast and efficient user experiences. Mentor junior engineers and promote a culture of continuous learning and improvement. Address and refactor legacy code, bringing it up to modern standards and practices. Drive changes in coding practices and standards to improve code quality and team efficiency. …/large-sized projects, particularly in single-page applications (SPA) or back-office systems. Experience in optimizing the performance of web applications. Strong knowledge of software engineering principles and design patterns. Understanding of backend technologies, including Node.js, Express, or similar frameworks. 5+ years preferred. Experience with RESTful API design and development. Familiarity with database management systems such More ❯

eager to take on a lot of responsibility, and are passionate about producing reliable software solutions. Responsibilities Plan and execute technical strategies from concept to deployment, shaping software architecture, design, and best practices. Work with designers, PMs, and engineers to build, test, and refine desktop and enterprise-level software. Engage in all SDLC phases—design, development, testing, deployment … cloud platforms like AWS. Proficient in agile methods like sprints, pair programming, and test-driven development. Adaptable, thrives in fast-paced environments, and quickly learns new technologies. SQL, RESTful API design, and modern front-end frameworks (React/Angular) experience is a plus. More ❯

eager to take on a lot of responsibility, and are passionate about producing reliable software solutions. Responsibilities Plan and execute technical strategies from concept to deployment, shaping software architecture, design, and best practices. Work with designers, PMs, and engineers to build, test, and refine desktop and enterprise-level software. Engage in all SDLC phases—design, development, testing, deployment … cloud platforms like AWS. Proficient in agile methods like sprints, pair programming, and test-driven development. Adaptable, thrives in fast-paced environments, and quickly learns new technologies. SQL, RESTful API design, and modern front-end frameworks (React/Angular) experience is a plus. More ❯

focus spans across multi-domain advancements, initially targeting the medical, education, and legal sectors. We specialize in turning innovation into impact. We are seeking an experienced Solution Architect to design and own the solution architecture for our scalable SaaS and custom products . The ideal candidate will align with the product roadmap, purpose, and feature use cases to define … architecture. This role demands a strong focus on Microservices Architecture , ensuring that our solutions are scalable, configurable, and cloud-agnostic, with seamless integrations across various systems. Key Responsibilities: Architecture & Design: Microservices Focus : Architect, design, and implement a robust microservices-based solution, enabling agility, scalability, and independent service deployments. Define and own the solution architecture for the product, ensuring … scalability, configurability, and cloud-agnostic capabilities. Develop HLD (High-Level Design) and LLD (Low-Level Design) documents for the product. Create and maintain the deployment architecture , ensuring efficient and resilient deployment strategies. Design the integration architecture , including APIs, microservices, and third-party integrations. Technical Leadership: Guide engineering teams in implementing the architecture while ensuring best practices in More ❯

focus spans across multi-domain advancements, initially targeting the medical, education, and legal sectors. We specialize in turning innovation into impact. We are seeking an experienced Solution Architect to design and own the solution architecture for our scalable SaaS and custom products . The ideal candidate will align with the product roadmap, purpose, and feature use cases to define … architecture. This role demands a strong focus on Microservices Architecture , ensuring that our solutions are scalable, configurable, and cloud-agnostic, with seamless integrations across various systems. Key Responsibilities: Architecture & Design: Microservices Focus : Architect, design, and implement a robust microservices-based solution, enabling agility, scalability, and independent service deployments. Define and own the solution architecture for the product, ensuring … scalability, configurability, and cloud-agnostic capabilities. Develop HLD (High-Level Design) and LLD (Low-Level Design) documents for the product. Create and maintain the deployment architecture , ensuring efficient and resilient deployment strategies. Design the integration architecture , including APIs, microservices, and third-party integrations. Technical Leadership: Guide engineering teams in implementing the architecture while ensuring best practices in More ❯

backend architecture, especially for candidates without deep JavaScript experience. Key Responsibilities Develop, maintain, and scale backend services in Java Support and eventually contribute to Node.js components (with onboarding support) Design and manage relational and NoSQL databases to ensure performance and scalability Build RESTful APIs and participate in full-stack development where applicable Collaborate with cross-functional teams to deliver … e.g., PostgreSQL, MySQL, MongoDB) Strong grasp of software engineering fundamentals and clean coding practices Basic exposure to or willingness to learn Node.js and JavaScript Understanding of microservices architecture and API design Experience working on systems that require reliability, scalability, and performance tuning Exposure to financial services or regulated environments Cloud experience (AWS, Azure) Experience working in cross-functional More ❯

backend architecture, especially for candidates without deep JavaScript experience. Key Responsibilities Develop, maintain, and scale backend services in Java Support and eventually contribute to Node.js components (with onboarding support) Design and manage relational and NoSQL databases to ensure performance and scalability Build RESTful APIs and participate in full-stack development where applicable Collaborate with cross-functional teams to deliver … e.g., PostgreSQL, MySQL, MongoDB) Strong grasp of software engineering fundamentals and clean coding practices Basic exposure to or willingness to learn Node.js and JavaScript Understanding of microservices architecture and API design Experience working on systems that require reliability, scalability, and performance tuning Exposure to financial services or regulated environments Cloud experience (AWS, Azure) Experience working in cross-functional More ❯

Software Engineer with strong Java backend experience, DevOps awareness, and proven technical leadership capabilities to join our Client’s London team. This is a high-impact role involving the design, development, and deployment of backend services that power our client’s security platform. You’ll work on systems at significant scale, leading both engineering efforts and mentoring team members … while collaborating with globally distributed teams in the US, Ireland and India. Responsibilities: Design, develop, and maintain Java-based backend services using Spring Boot , REST/GraphQL , Kafka , PostgreSQL , and RabbitMQ . Contribute to infrastructure modernisation efforts, working closely with DevOps teams on Kubernetes , CI/CD pipelines , and legacy system migrations. Innovate across the stack, taking ownership of … Requirements: 7–10+ years of professional experience in software engineering, with a strong focus on Java backend development . Solid understanding of Spring Boot , Kafka , RabbitMQ , PostgreSQL , and modern API design patterns. Hands-on experience or familiarity with DevOps tools and concepts – e.g. Kubernetes , Git-based CI/CD , cloud infrastructure (AWS/GCP/Azure). Bonus More ❯

Software Engineer with strong Java backend experience, DevOps awareness, and proven technical leadership capabilities to join our Client’s London team. This is a high-impact role involving the design, development, and deployment of backend services that power our client’s security platform. You’ll work on systems at significant scale, leading both engineering efforts and mentoring team members … while collaborating with globally distributed teams in the US, Ireland and India. Responsibilities: Design, develop, and maintain Java-based backend services using Spring Boot , REST/GraphQL , Kafka , PostgreSQL , and RabbitMQ . Contribute to infrastructure modernisation efforts, working closely with DevOps teams on Kubernetes , CI/CD pipelines , and legacy system migrations. Innovate across the stack, taking ownership of … Requirements: 7–10+ years of professional experience in software engineering, with a strong focus on Java backend development . Solid understanding of Spring Boot , Kafka , RabbitMQ , PostgreSQL , and modern API design patterns. Hands-on experience or familiarity with DevOps tools and concepts – e.g. Kubernetes , Git-based CI/CD , cloud infrastructure (AWS/GCP/Azure). Bonus More ❯

the Founding iOS Tech Lead, SwiftUI | HealthTech, AI, Greenfield Start-up | Shoreditch, Hybrid | Up to £110,000 + Stocks & Benefits APIs & Communication: Strong understanding of REST, GraphQL, WebSockets, and API design best practices Ideally Fullstack TypeScript Engineer (across frontend and backend) Proven experience as a senior software engineer or tech lead, ideally in an early stage startup environment … Node.js, Java) and one frontend framework (e.g., React with Tailwind, Angular, Vue) and SwiftUI (for mobile) Ideally experience with cloud services (AWS, GCP) and DevOps practices Knowledge of database design and management (SQL and NoSQL). Strong understanding of security best practices and data protection regulations. Compensation for the Founding Full Stack Tech Lead, Typescript and iOS SwiftUI | HealthTech More ❯

the Founding iOS Tech Lead, SwiftUI | HealthTech, AI, Greenfield Start-up | Shoreditch, Hybrid | Up to £110,000 + Stocks & Benefits APIs & Communication: Strong understanding of REST, GraphQL, WebSockets, and API design best practices Ideally Fullstack TypeScript Engineer (across frontend and backend) Proven experience as a senior software engineer or tech lead, ideally in an early stage startup environment … Node.js, Java) and one frontend framework (e.g., React with Tailwind, Angular, Vue) and SwiftUI (for mobile) Ideally experience with cloud services (AWS, GCP) and DevOps practices Knowledge of database design and management (SQL and NoSQL). Strong understanding of security best practices and data protection regulations. Compensation for the Founding Full Stack Tech Lead, Typescript and iOS SwiftUI | HealthTech More ❯

the Founding iOS Tech Lead, SwiftUI | HealthTech, AI, Greenfield Start-up | Shoreditch, Hybrid | Up to £110,000 + Stocks & Benefits APIs & Communication: Strong understanding of REST, GraphQL, WebSockets, and API design best practices Ideally Fullstack TypeScript Engineer (across frontend and backend) Proven experience as a senior software engineer or tech lead, ideally in an early stage startup environment … Node.js, Java) and one frontend framework (e.g., React with Tailwind, Angular, Vue) and SwiftUI (for mobile) Ideally experience with cloud services (AWS, GCP) and DevOps practices Knowledge of database design and management (SQL and NoSQL). Strong understanding of security best practices and data protection regulations. Compensation for the Founding Full Stack Tech Lead, Typescript and iOS SwiftUI | HealthTech More ❯