1 to 25 of 108 API Development Jobs in London

We are looking for Software Engineers with a strong foundation in API development and C# to join our data engineering team in a highly regulated industry. In this role, you’ll be instrumental in designing and building scalable, secure software systems that support seamless data movement between internal systems, third-party platforms, and cloud services. Your core focus … strict regulatory standards. We’re seeking candidates with over 5 years of relevant experience, a solid understanding of software system design, and a strong command of C# and modern API development patterns. A background in working with data systems, cloud integrations, and secure, large-scale applications will be highly advantageous. Core Responsibilities: •Design, develop, and maintain scalable APIs … approach to diagnosing and resolving issues. •Detail-oriented with a mindset geared toward continuous improvement. •Able to prioritize and manage multiple projects simultaneously in a dynamic environment. Technical Skills: • API Development: •Proven experience designing and building RESTful APIs and services at scale. •Experience with authentication, authorization, and secure API communication (OAuth2, JWT, etc.). •Familiarity with API More ❯

We are looking for Software Engineers with a strong foundation in API development and C# to join our data engineering team in a highly regulated industry. In this role, you’ll be instrumental in designing and building scalable, secure software systems that support seamless data movement between internal systems, third-party platforms, and cloud services. Your core focus … strict regulatory standards. We’re seeking candidates with over 5 years of relevant experience, a solid understanding of software system design, and a strong command of C# and modern API development patterns. A background in working with data systems, cloud integrations, and secure, large-scale applications will be highly advantageous. Core Responsibilities: •Design, develop, and maintain scalable APIs … approach to diagnosing and resolving issues. •Detail-oriented with a mindset geared toward continuous improvement. •Able to prioritize and manage multiple projects simultaneously in a dynamic environment. Technical Skills: • API Development: •Proven experience designing and building RESTful APIs and services at scale. •Experience with authentication, authorization, and secure API communication (OAuth2, JWT, etc.). •Familiarity with API More ❯

for fueling, EV charging, and parking directly from their vehicles. What you will do Maintain and expand our serverless card payment infrastructure built with TypeScript, Node.js, and AWS (Lambda, API Gateway, DynamoDB). Ensure continued PCI DSS compliance. Work with others to fix bugs, implement minimal new features, trace errors, and ensure security patches are applied in production and … resilience. Who are you Strong hands-on experience with TypeScript and Node.js. Frontend familiarity is helpful (e.g. React). Proficiency with AWS services in a serverless context, especially CloudFront, API Gateway, Lambda, DynamoDB and CloudWatch. Commercial experience with Infrastructure-as-Code tools such as Terraform, SST, CDK or CloudFormation. Strong understanding of API development, RESTful design, and … secure authentication. Demonstrated knowledge of API security and OWASP Top 10 vulnerabilities. Experience with Docker, Linux, Git, and container-based environments. Hands-on development experience with PCI DSS, payment systems, or other regulated environments is essential Excellent communicator with a self-starter attitude and comfort working autonomously. Demonstrable expertise and understanding of API development/design More ❯

for fueling, EV charging, and parking directly from their vehicles. What you will do Maintain and expand our serverless card payment infrastructure built with TypeScript, Node.js, and AWS (Lambda, API Gateway, DynamoDB). Ensure continued PCI DSS compliance. Work with others to fix bugs, implement minimal new features, trace errors, and ensure security patches are applied in production and … resilience. Who are you Strong hands-on experience with TypeScript and Node.js. Frontend familiarity is helpful (e.g. React). Proficiency with AWS services in a serverless context, especially CloudFront, API Gateway, Lambda, DynamoDB and CloudWatch. Commercial experience with Infrastructure-as-Code tools such as Terraform, SST, CDK or CloudFormation. Strong understanding of API development, RESTful design, and … secure authentication. Demonstrated knowledge of API security and OWASP Top 10 vulnerabilities. Experience with Docker, Linux, Git, and container-based environments. Hands-on development experience with PCI DSS, payment systems, or other regulated environments is essential Excellent communicator with a self-starter attitude and comfort working autonomously. Demonstrable expertise and understanding of API development/design More ❯

seeking a Full Stack Software Engineer to join our team! We're particularly looking for someone with strong Golang experience and with some experience of TypeScript and React frontend development . If you also have a knack for Kubernetes/containerisation, that's a significant bonus! In this role, you'll be a key contributor to the development … We're excited to have you contribute to our mission! Responsibilities : As a Safe Intelligence Full Stack Software Engineer, you will: Engineering of Golang-based backend systems , focusing on API development and integration. Contribute significantly to software development on our TypeScript-based frontend systems , primarily utilizing React to craft intuitive and highly functional user interfaces. Productize and … dataset management, verification workflows, and result/metric aggregations. Collaborate closely with our scientific and technical teams to interface with and containerize our PyTorch-based verification toolkit. Champion an API-first development approach to deliver feature-rich, versioned interfaces that support both our TypeScript user interface and Python-based SDKs. Develop and maintain Infrastructure as Code (IaC) and More ❯

seeking a Full Stack Software Engineer to join our team! We're particularly looking for someone with strong Golang experience and with some experience of TypeScript and React frontend development . If you also have a knack for Kubernetes/containerisation, that's a significant bonus! In this role, you'll be a key contributor to the development … We're excited to have you contribute to our mission! Responsibilities : As a Safe Intelligence Full Stack Software Engineer, you will: Engineering of Golang-based backend systems , focusing on API development and integration. Contribute significantly to software development on our TypeScript-based frontend systems , primarily utilizing React to craft intuitive and highly functional user interfaces. Productize and … dataset management, verification workflows, and result/metric aggregations. Collaborate closely with our scientific and technical teams to interface with and containerize our PyTorch-based verification toolkit. Champion an API-first development approach to deliver feature-rich, versioned interfaces that support both our TypeScript user interface and Python-based SDKs. Develop and maintain Infrastructure as Code (IaC) and More ❯

As a Senior Software Engineer, you will play a pivotal role in architecting and developing our next-generation web application and API. This role requires technical leadership, hands-on development, and mentoring of junior developers. You will drive the adoption of best practices, ensuring scalability, security, and performance. If you are passionate about software development, enjoy solving complex … tangible impact. This role will be eligible for visa sponsorship only for candidates that are already based in the UK. Key Responsibilities Technical Leadership: Lead the technical design and development of scalable, secure web applications and APIs, driving best practices across the development lifecycle. Architecture & Design: Oversee system architecture decisions, ensuring alignment with business goals and scalability requirements. … Mentorship: Mentor and guide junior developers, fostering a collaborative learning environment. API Development: Design and build RESTful API endpoints using NodeJS and Express, including detailed API documentation. Database Management: Design, optimize, and maintain complex SQL data models, ensuring efficient data structures, query performance, and reliability. Full-Stack Development: Develop responsive and performant front-end applications More ❯

As a Senior Software Engineer, you will play a pivotal role in architecting and developing our next-generation web application and API. This role requires technical leadership, hands-on development, and mentoring of junior developers. You will drive the adoption of best practices, ensuring scalability, security, and performance. If you are passionate about software development, enjoy solving complex … tangible impact. This role will be eligible for visa sponsorship only for candidates that are already based in the UK. Key Responsibilities Technical Leadership: Lead the technical design and development of scalable, secure web applications and APIs, driving best practices across the development lifecycle. Architecture & Design: Oversee system architecture decisions, ensuring alignment with business goals and scalability requirements. … Mentorship: Mentor and guide junior developers, fostering a collaborative learning environment. API Development: Design and build RESTful API endpoints using NodeJS and Express, including detailed API documentation. Database Management: Design, optimize, and maintain complex SQL data models, ensuring efficient data structures, query performance, and reliability. Full-Stack Development: Develop responsive and performant front-end applications More ❯

presents significant problem solving opportunities for developers who are keen to gain experience working in London’s fast growing fintech ecosystem. Revenir’s core product is a white label API, which enhances the capabilities of banking apps, automatically refunding VAT (Value Added Tax) to customers, typically within 48 hours. Banks are now collaborating with fintechs more than ever to … customer experience through their marketplace. Summary: We are looking for a highly motivated and self-driven engineer to join our Technology team, reporting to the CTO to support the development of our proprietary AI technology and product development. This individual should have knowledge of computer science principles and software engineering to support development of Revenir’s technology. This … supporting role to our experienced technology team who have built and developed an innovative product which utilises a range of AWS services, including Lambda, SQS, Step Functions (Express & Standard), API Gateway, DynamoDB, Bedrock, and SageMaker. Responsibilities: Support API Development: Collaborate with the team to research and contribute to the design documentation of APIs, assisting in understanding requirements More ❯

Responsibilities Design, develop, and maintain high-quality Java applications and microservices. Collaborate with cross-functional teams including product, UX, and QA to deliver innovative solutions. Participate in full software development lifecycle: analysis, design, development, testing, deployment, and support. Ensure code quality through unit testing, code reviews, and adherence to best practices. Troubleshoot, debug, and optimize applications for performance … programming and design patterns. Experience with Spring Framework (Spring Boot, Spring MVC, Spring Data). Experience with relational databases (e.g., MySQL, PostgreSQL) and writing SQL queries. Knowledge of RESTful API development and integration. Familiarity with version control systems, preferably Git. Understanding of Agile/Scrum methodologies. Desirable Skills Experience with cloud platforms (AWS, Azure, or GCP). Knowledge … to £80,000. Hybrid working with 3 days in the London office. Opportunity to work on innovative projects in the travel industry. Collaborative and supportive team environment. Learning and development opportunities to grow your career More ❯

Responsibilities: Design, develop, and maintain high-quality Java applications and microservices. Collaborate with cross-functional teams including product, UX, and QA to deliver innovative solutions. Participate in full software development lifecycle: analysis, design, development, testing, deployment, and support. Ensure code quality through unit testing, code reviews, and adherence to best practices. Troubleshoot, debug, and optimize applications for performance … programming and design patterns. Experience with Spring Framework (Spring Boot, Spring MVC, Spring Data) . Experience with relational databases (e.g., MySQL, PostgreSQL) and writing SQL queries. Knowledge of RESTful API development and integration. Familiarity with version control systems, preferably Git . Understanding of Agile/Scrum methodologies. Desirable Skills: Experience with cloud platforms (AWS, Azure, or GCP). … to £80,000. Hybrid working with 3 days in the London office. Opportunity to work on innovative projects in the travel industry. Collaborative and supportive team environment. Learning and development opportunities to grow your career. Seniority Level Mid-Senior level Industry Technology, Information and Media Travel Arrangements Employment Type Full-time Job Functions Information Technology Skills Spring Boot Spring More ❯

Responsibilities: Design, develop, and maintain high-quality Java applications and microservices. Collaborate with cross-functional teams including product, UX, and QA to deliver innovative solutions. Participate in full software development lifecycle: analysis, design, development, testing, deployment, and support. Ensure code quality through unit testing, code reviews, and adherence to best practices. Troubleshoot, debug, and optimize applications for performance … programming and design patterns. Experience with Spring Framework (Spring Boot, Spring MVC, Spring Data) . Experience with relational databases (e.g., MySQL, PostgreSQL) and writing SQL queries. Knowledge of RESTful API development and integration. Familiarity with version control systems, preferably Git . Understanding of Agile/Scrum methodologies. Desirable Skills: Experience with cloud platforms (AWS, Azure, or GCP). … to £80,000. Hybrid working with 3 days in the London office. Opportunity to work on innovative projects in the travel industry. Collaborative and supportive team environment. Learning and development opportunities to grow your career. Seniority Level Mid-Senior level Industry Technology, Information and Media Travel Arrangements Employment Type Full-time Job Functions Information Technology Skills Spring Boot Spring More ❯

streamlines compliance, enhances conversion, and improves the overall student experience. How youll spend your day As a Full Stack Lead Engineer, you will be responsible for leading the design, development, and maintenance of scalable, high-performance applications across both frontend and backend systems. You will collaborate closely with product managers, designers, and other engineers to deliver features that create … enjoys solving complex technical challenges. Youll also be expected to actively explore, evaluate, and adopt the latest Generative AI tools and practices to enhance productivity, streamline workflows, and accelerate development across the engineering team. Lead full stack development using ReactJS, TypeScript, Node.js , and related technologies. Architect and implement robust, scalable, and secure APIs and web applications. Collaborate with … and enforce coding standards, best practices, and documentation. Identify and resolve complex performance, scalability, and reliability challenges. Contribute to DevOps processes (CI/CD, monitoring, infrastructure) and help optimize development pipelines. Participate in architecture discussions and influence the future direction of the platform. Investigate and adopt new technologies (e.g. WASM, serverless patterns) to continually improve the platform. What youll More ❯

automation opportunities. Skilled in creating process flow diagrams, conducting time-motion studies, identifying bottlenecks and inefficiencies, and redesigning processes to be machine-readable and automation-ready using methodologies. Python Development - Strong proficiency in Python programming including object-oriented design, asynchronous programming, error handling, and writing clean, maintainable code. Experience with key libraries including Pandas, NumPy for data manipulation, requests … in building end-to-end business process applications, configuring workflows, implementing business rules, managing records, and integrating Appian with external systems via REST APIs, web services, and connected systems. API Development & Integration - Proficient in designing and building RESTful APIs using FastAPI, Flask, or Django REST Framework for exposing AI models and automation services. Experience with API authentication … OAuth, JWT), rate limiting, error handling, API documentation (Swagger/OpenAPI), webhooks, and integrating disparate systems to create seamless automated workflows. Document Processing & OCR - Experience implementing intelligent document processing solutions using OCR technologies (Tesseract, Azure AI Document Intelligence, natural language processing for information extraction, document classification, and building end-to-end pipelines for automated document ingestion, processing, and data More ❯

automation opportunities. Skilled in creating process flow diagrams, conducting time-motion studies, identifying bottlenecks and inefficiencies, and redesigning processes to be machine-readable and automation-ready using methodologies. Python Development - Strong proficiency in Python programming including object-oriented design, asynchronous programming, error handling, and writing clean, maintainable code. Experience with key libraries including Pandas, NumPy for data manipulation, requests … in building end-to-end business process applications, configuring workflows, implementing business rules, managing records, and integrating Appian with external systems via REST APIs, web services, and connected systems. API Development & Integration - Proficient in designing and building RESTful APIs using FastAPI, Flask, or Django REST Framework for exposing AI models and automation services. Experience with API authentication … OAuth, JWT), rate limiting, error handling, API documentation (Swagger/OpenAPI), webhooks, and integrating disparate systems to create seamless automated workflows. Document Processing & OCR - Experience implementing intelligent document processing solutions using OCR technologies (Tesseract, Azure AI Document Intelligence, natural language processing for information extraction, document classification, and building end-to-end pipelines for automated document ingestion, processing, and data More ❯

work with your colleagues, stakeholders and third parties, to align on requirements and deliver a user experience you can be proud of. The role requires demonstrable experience of backend development using PHP and MySQL, and includes full lifecycle development of RESTful APIs and web apps which can operate at scale on AWS. You will appreciate the benefits of … Experience of software architecture and presenting technical designs to your team and stakeholders. Excellent communicator with a self-starter attitude and comfort working autonomously. Demonstrable expertise and understanding of API development/design and experience interfacing with disparate systems. Applicable understanding of software security, common exploits and secure development practices, including the OWASP Top 10. Proven and More ❯

TDD, BDD) Seek out ways to measure the impact your solutions have on the business and use them to inform future workSkills and Experience Specification Essential : Experience of application development using Python (FastAPI desirable) Relevant qualifications and experience i.e. BSc in Computer Science or Engineering, Software Development certifications, etc. Demonstrable experience in configuring and developing complex software solutions … Strong understanding of object-oriented programming and test driven development (TDD and BDD) Strong understanding of agile software engineering practices Appetite for continual experimentation & learning Desirable : Experience of AWS or Azure Hands-on knowledge of Domain Driven Design (DDD) Some experience with frontend technologies such as HTML, CSS, HTMX, React Experience of C# with .NET Web and API development Understanding of git, CI/CD and DevOps practices and experience in Observability/monitoring Any knowledge of Actuarial/Commercial Insurance Some exposure to or interest in Terraform and deployment pipelines in AWS or Azure Awareness of modern software techniques such as integration patterns, microservices, containerisationWhat We OfferThe Tokio Marine HCC Group of Companies offers a More ❯

UK is investing heavily in modernising its technology platforms and adopting agile, cloud-native solutions. We are seeking a Tech Lead to help drive this transformation and lead the development of scalable, secure, and high-performing systems. Role Overview As Tech Lead, you will be responsible for the technical leadership of a cross-functional agile team. You will guide … software architectural decisions, contribute hands-on to development, mentor engineers, and ensure the delivery of robust software aligned with business objectives. Key Responsibilities Lead the design and development of enterprise-grade applications using Java and related technologies Define and enforce agreed coding standards, architectural principles, and engineering best practices Collaborate with Product Owners, Business Analysts, Solution Architects and … experience as a Tech Lead or Senior Java Developer in agile environments Strong understanding of Agile framework & principles Strong proficiency in Java (preferably Java 17+), Spring Boot, and RESTful API development Experience with cloud platforms (AWS preferred), containerization (e.g. Docker, Kubernetes) and microservices architecture Familiarity with CI/CD tools such as Jenkins, AWS CodePipeline, GitLab CI, or More ❯

desirable Your main responsibility will be to deliver clean, maintainable, and well-tested code that adheres to SOLID principles. You will work collaboratively across Quality Assurance, DevOps, and other development teams, sharing knowledge, supporting onboarding, and contributing to code reviews. Key Responsibilities Deliver high-quality, maintainable code and development outcomes. Manage data exchange between backend services, front-end … clear code comments. Ensure compliance with quality standards, including automated testing and code reviews. Address non-functional requirements such as performance, monitoring, and operational support. Support releases through all development environments, maintaining quality and reliability. Contribute to skill development and technology adoption within the team. Present technical concepts in demos and participate in user feedback sessions. Provide accurate … RAML, REST APIs, flow control, and error handling. Hands-on experience with the Anypoint Platform (CloudHub, VPC, VPN, DLB, firewalls, and cloud technologies). Securing and managing APIs using API Manager. Developing frameworks for error handling and logging. Managing the API development lifecycle from design to governance and management. Working with batch message processing, Salesforce, file, and More ❯

CI/CD, testing, and automation. What Were Looking For Comp Sci or STEM Degree from a Top Russell group University 3-5 years of experience in full-stack development, with a focus on Python and Django . Strong experience with React or React Native for building dynamic, responsive front-end applications. Proficiency in SQL databases (PostgreSQL/MySQL … practices and familiarity with tools such as Docker , Kubernetes , and cloud platforms ( AWS/GCP/Azure ). Knowledge of Node.js and building scalable back-end services. Experience in API development and integrating third-party APIs. Familiarity with Agile methodologies, version control (Git), and CI/CD pipelines. Bonus: Experience in the PropTech sector or working with property … Offer Competitive salary A fast-paced, collaborative, and innovative start-up environment. Flexible working hours and remote/hybrid options. Opportunity to shape the tech stack and architecture. Personal development budget and training opportunities. More ❯

A public sector organisation is looking for a skilled SharePoint Developer to join their Development and Testing team. This is a key role for someone passionate about building high-quality, scalable applications using SharePoint, Microsoft 365, and Azure services. If you enjoy solving complex problems and collaborating across teams to deliver impactful digital solutions, we'd love to hear … governance, and promoting best practices across the organisation. Responsibilities Design and Customize SharePoint Solutions: Develop tailored solutions using SharePoint and M365 product to address specific business requirements Custom SharePoint Development: Create custom SharePoint apps, Teams apps, and web parts using the SPFx framework (React). Additionally, utilize Power Apps, Power Automate, and related technologies. Application Maintenance: Utilize DevOps practices … security of SharePoint environments Configurating and deployment: performing site configuration for new installations, deploying custom features, and staying up to date with the latest SharePoint developments and upgrades. Secure Development Practices: Developing clean, reusable, scalable, and maintainable code following the Software Development Life Cycle (SDLC). Conducting peer code reviews upon request and adhering to development coding More ❯

A public sector organisation is looking for a skilled SharePoint Developer to join their Development and Testing team. This is a key role for someone passionate about building high-quality, scalable applications using SharePoint, Microsoft 365, and Azure services. If you enjoy solving complex problems and collaborating across teams to deliver impactful digital solutions, we'd love to hear … governance, and promoting best practices across the organisation. Responsibilities Design and Customize SharePoint Solutions: Develop tailored solutions using SharePoint and M365 product to address specific business requirements Custom SharePoint Development: Create custom SharePoint apps, Teams apps, and web parts using the SPFx framework (React). Additionally, utilize Power Apps, Power Automate, and related technologies. Application Maintenance: Utilize DevOps practices … security of SharePoint environments Configurating and deployment: performing site configuration for new installations, deploying custom features, and staying up to date with the latest SharePoint developments and upgrades. Secure Development Practices: Developing clean, reusable, scalable, and maintainable code following the Software Development Life Cycle (SDLC). Conducting peer code reviews upon request and adhering to development coding More ❯

paced, collaborative environment and grow your skills. Key Responsibilities: Develop and maintain scalable applications using Python (Django). Build and integrate APIs and third-party services. Participate in Agile development cycles and CI/CD processes. Optimize applications for performance and scalability. Collaborate with cross-functional teams. Requirements: Computer Science or STEM degree from a top Russell Group University … 1st or 2:1). 5+ years of full-stack development experience (Python/Django). Strong experience with SQL databases (PostgreSQL/MySQL). Familiarity with DevOps tools (Docker, Kubernetes, AWS/GCP/Azure). Experience with API development and Git. More ❯

systems using Python microservices, helping to scale fast and deliver real impact! What You’ll Do Build and maintain backend features with strong test coverage Contribute to architecture and API design Translate business needs into technical solutions Promote best practices in coding and DevOps Collaborate across teams to ship reliable, high-quality software What You’ll Bring 4+ years … of software development experience Strong skills in Python and API development Knowledge of microservices, CI/CD, and modern engineering practices Familiarity with SQL/NoSQL databases (Bonus) Frontend experience with JavaScript/TypeScript Apply directly or send your CV to cailacunningham@albertbow.com. Thanks, Caila More ❯

systems using Python microservices, helping to scale fast and deliver real impact! What You’ll Do Build and maintain backend features with strong test coverage Contribute to architecture and API design Translate business needs into technical solutions Promote best practices in coding and DevOps Collaborate across teams to ship reliable, high-quality software What You’ll Bring 4+ years … of software development experience Strong skills in Python and API development Knowledge of microservices, CI/CD, and modern engineering practices Familiarity with SQL/NoSQL databases (Bonus) Frontend experience with JavaScript/TypeScript Apply directly or send your CV to cailacunningham@albertbow.com. Thanks, Caila More ❯