1 to 25 of 117 API Development Jobs in London

/CD processes • Investigate and resolve technical issues, defects, performance problems and production incidents • Address security, accessibility, privacy, resilience, scalability and performance throughout the development lifecycle • Contribute to technical documentation, knowledge sharing, development standards, patterns and best practices • Support an inclusive engineering culture and mentor colleagues where appropriate … Experience with RESTful APIs and integration with external or internal services Experience with automated unit and integration testing Experience using Git and modern software development workflows Understanding of clean code, modularity, maintainability, version control and design patterns Experience diagnosing and resolving application defects, performance issues and production problems Understanding ...

Full Stack Mobile Engineer About the Role We are seeking an experienced Full Stack Mobile Engineer to join our mobile application development team. You will work closely with business stakeholders, product owners, designers, testers and fellow engineers to deliver high-quality digital products used by thousands of learners … driving instructors across the UK. The role has a strong focus on Java backend development, REST API development, database integration and end-to-end software delivery. Experience with Flutter is desirable, while knowledge of AWS and Sitecore would be advantageous. You will take ownership of features from ...

technical development, architecture and engineering roadmap for Agile X Build and oversee backend services using Node.js and Express Develop modern frontend experiences using React and Vite Own and evolve the platform's AWS and DynamoDB data architecture Build scalable, modular and API-first systems connecting retail operations, workforce … engineering priorities, sprint planning, testing, documentation and releases Establish engineering standards across code quality, testing and deployment Lead and support engineers, contractors and external development partners Help evolve Agile X towards data visualisation, predictive analytics, automation and AI-assisted operational decision-making Requirements Experienced Senior or Lead Full Stack ...

Tech: ASP.NET MVC 5, Restful API, Angular, SQL, Azure Challenge: Greenfield Trading platform, API development, industry specific challenges Firm: Well-known fintech50 business, 10 man flat Dev Team Pay: 75k, Bonus- 750 training budget, Pension, Life/Health, Some Flex WorkingLead ASP.NET MVC Developer FintechQuant is urgently … looking for a Lead ASP.NET MVC Developer to join our high profile client. Current challenges include cloud migration, greenfield trading platform development, and bank based API creation. Our client is well known in the WRAP and SIPP market as a full service provider. The environment is that ...

Focus on greenfield development and improvement of existing systems Build REST APIs Engineer microservices Evolve systems supporting card payments, treasury management, transaction booking, and crypto liquidity Develop predominantly with Java 25 on the backend and PostgreSQL Use Spring Boot for delivery Develop business logic with emphasis on clean, maintainable … delivery Collaborate with a talented team to create solutions that drive financial inclusion and transform how people manage money Requirements Demonstrable experience in Backend development, with fluency in Java Bachelor's Degree (or above) in Computer Science, Mathematics, Physics, or other Engineering/Science disciplines Quick learner with ...

move code safely into production Write clean, well-tested code using TDD/BDD, unit tests, and integration tests Apply secure coding practices throughout development Help transform organisations and complex business domains through engineering consultancy Requirements 5+ years of Full Stack Engineering experience Experience with React or React Native … Experience with Java and Spring Boot RESTful API design and development Microservices architecture SQL/database technologies TDD, BDD, unit testing, and integration testing GitLab CI/CD pipelines Cloud engineering with AWS Secure coding practices DevOps and continuous delivery Ability to write clean, well-tested code Ability ...

technical leadership for the design, build, productionisation and ongoing operation of secure Django-based applications and supporting infrastructure. The role will establish the development processes, coding standards, API standards, security approach, RBAC model and application architecture needed for repeatable delivery. The developer will bring extensive experience in productionising … securing Django applications, embedding automated testing, CI/CD and agile development practices, and creating documentation to support Technical Design Authority (TDA), security assurance and operational handover. Responsibilities Lead the architecture, development and deployment of secure Django applications and associated infrastructure in Azure. Define and embed Django development ...

Tech: C# .Net, ASP.NET, WPF, MySQL Challenge: Greenfield High Data Throughput platform, API development, industry specific challenges Firm: Well-known fintech50 business, City of London, 10 man flat Dev Team Pay: 80k, Bonus- training budget, Pension, Life/Health, Some Flex Working Development Team Lead Fintech Quant … Lead Developer will Manage the Dev. team including recruitment Build and deliver business requirements Collaborate with Product Owner on defining development requirements and schedule Become enlightened on the system architectureThe environment is that of Facebook or Google, relaxed open with time to think and make the right decisions. ...

looking for an experienced Full-Stack Developer & Development Team Lead with strong hands-on experience in building and maintaining modern web applications. The ideal candidate will combine strong frontend and backend development skills with technical leadership experience. This is a hands-on role where you will contribute directly … production code while also leading the development team, reviewing technical work, maintaining development standards, supporting architecture decisions, and ensuring reliable delivery. Key Responsibilities Full-Stack Development Design, develop, test, and maintain scalable web applications across frontend and backend systems. Build modern applications using technologies such as TypeScript ...

Engineering community to develop our data and MLOps capability infrastructure Strong experience in software engineering with proficiency in a language such as Python for API development, data engineering and automation tasks A background in working with storage solutions such as PostgreSQL, MySQL, and BigQuery Experience in API … development using tools such as FastAPI or Flask , enabling data access and integration across systems Solid knowledge of cloud platforms (GCP and/or AWS), with the ability to design and deploy data solutions at scale Experience with IAC and CI/CD pipelines to ensure reliable, repeatable ...

world work better for people. Overview We are looking for an AI Developer to join our dynamic team and contribute to the design, development, and deployment of AI-powered applications and intelligent workflows. The ideal candidate will have a strong background in Python development, experience integrating … into production systems, and the ability to build scalable, secure, and high-performance applications. Experience with data processing, cloud-native architectures, and modern AI development patterns will be highly valued. Responsibilities Develop, test, and maintain AI-powered applications and intelligent workflows using Python in a cloud-native environment Design ...

Lead Developer/Team Lead – FintechTech: C# .net, Azure, SQL, Team City, GIT, TFSChallenge: Greenfield Trading platform, API development, industry specific challengesFirm: Well-known Insurtech software business, West London, 10 man flat Dev TeamPay: 65k, Bonus- 750 training budget, Pension, Life/Health, Some Flex WorkingQuant is urgently … looking for a Lead Developer/Development Manager to join our high profile client. Current challenges include cloud migration, greenfield trading platform development, and bank based API creation. Our client is a well known fintech software house in the City. Day to Day the Lead Developer/ ...

GenAI projects. As a Senior Developer, you will be at the driving innovation and delivering cutting-edge solutions. Your expertise will contribute to the development of our platform, shaping its capabilities and providing impactful solutions. Join our dynamic team and be part of a collaborative environment that fosters continuous … learning and creativity. If you are passionate about machine learning, AI, and want to contribute to the platform capability development for our whole organization, we invite you to apply for the position of Technology Architecture in our AI Enablement Team. Job responsibilities Software Development: Design, develop, and maintain ...

Role Summary :We are seeking a Java API Developer to join our Digital Asset development team. This is a hands-on software engineering role responsible for designing, developing, testing, and supporting RESTful APIs and backend services in a financial services environment. The role contributes to building reliable, secure … Java-based backend services and REST APIs that support financial services workflows and data use cases. Implement APIs in line with internal requirements for API design, security, versioning, and documentation, ensuring solutions are consistent and reusable. Collaborate with business and technology stakeholders to understand requirements, clarify edge cases ...

mobile applications that support an evolving digital strategy. The Role As a Digital Application Developer, you'll be involved in the full software development lifecycle, working closely with product, design and engineering teams to deliver secure, scalable and user-focused digital solutions. You'll contribute to the development … Skills & Experience We're interested in speaking with candidates who have experience in some of the following areas: React, TypeScript and modern JavaScript development Mobile application development using iOS and/or Android technologies API development and systems integration Software design principles and application architecture ...

mobile applications that support an evolving digital strategy. The Role As a Digital Application Developer, you'll be involved in the full software development lifecycle, working closely with product, design and engineering teams to deliver secure, scalable and user-focused digital solutions. You'll contribute to the development … Skills & Experience We're interested in speaking with candidates who have experience in some of the following areas: React, TypeScript and modern JavaScript development Mobile application development using iOS and/or Android technologies API development and systems integration Software design principles and application architecture ...

GenAI projects.As a Senior Developer, you will be at the driving innovation and delivering cutting-edge solutions. Your expertise will contribute to the development of our platform, shaping its capabilities and providing impactful solutions.Join our dynamic team and be part of a collaborative environment that fosters continuous learning … creativity. If you are passionate about machine learning, AI, and want to contribute to the platform capability development for our whole organization, we invite you to apply for the position of Technology Architecture in our AI Enablement Team.**Job responsibilities:*** Software Development: Design, develop, and maintain applications. Write ...

experienced Senior Full Stack Engineers to join a high-performing engineering team building and enhancing modern enterprise applications. This is a hands-on development role for engineers who enjoy working across the full technology stack, delivering scalable web applications, cloud-native services, and modern user experiences. The successful candidate … will have strong Java and Front End development experience, a passion for software engineering best practices, and experience working within Agile delivery teams. Key Responsibilities Design, develop and maintain scalable enterprise applications. Build modern Front-End applications using React (preferred) or Angular. Develop secure and performant backend services using ...

experienced Senior Full Stack Engineers to join a high-performing engineering team building and enhancing modern enterprise applications. This is a hands-on development role for engineers who enjoy working across the full technology stack, delivering scalable web applications, cloud-native services, and modern user experiences. The successful candidate … will have strong Java and Front End development experience, a passion for software engineering best practices, and experience working within Agile delivery teams. Key Responsibilities Design, develop and maintain scalable enterprise applications. Build modern Front-End applications using React (preferred) or Angular. Develop secure and performant backend services using ...

Software Development: Design, develop, and maintain applications. Write well-structured, efficient, and maintainable code. Debug and resolve complex technical issues Technical Leadership: Provide technical guidance and mentorship to junior developers. Collaborate with architects to design & implement scalable and efficient software solutions. Stay up-to-date with industry best practices … preferred) with Proven experience of 7+ years in developing IT solutions Proficient in Python & ReactJS and related technologies is required. Experience with GenAI application development including vector stores, RAG solutions, context engineering, prompt engineering, observability is essential Experience with Agentic AI development & Java Spring Framework would be advantageous ...

this role is to contribute to application systems analysis and programming activities, ensuring the delivery of high-quality and robust software solutions. Responsibilities Application Development: Design, code, and debug Java applications. Contribute to the entire software development lifecycle, from conception and design to testing and deployment. Technical Contribution … Java, adjacent technologies, and software engineering principles to help solve problems and troubleshoot issues. AI Integration: Actively explore and utilize modern AI-powered development tools and technologies to enhance productivity and code quality. Experience with AI development assistants and agents is desirable. Collaboration & Communication: Clearly communicate technical concepts ...

DescriptionRole Summary :We are seeking an experienced Java API Developer to join our Digital Asset development team. This is a hands‐on engineering role responsible for building and operating secure, resilient API services that power institutional digital asset capabilities—spanning digital custody, tokenization enablement, digital transfer agency … REST APIs that support digital asset product flows (custody, tokenization, TA, digital cash/settlement) and integrate cleanly into the broader platform. Build API services that participate in the platform's centralized integration approach—supporting client/app onboarding and app-to-service integrations via an Integration ...

supporting the team's transition from Power BI to Databricks and building out a broader data and application capability. The role combines full-stack development, data visualisation and API development, with experience across Databricks, Python, web development and APIs being particularly relevant. You'll be involved … designing and developing the technical infrastructure and API layers that sit behind applications, as well as proof-of-concept and early-stage solutions. A key part of the role will be technical leadership without direct people management - mentoring and upskilling a relatively junior team, helping establish best practices around ...

Tech: C#, Multithreading, Grindgain, Linq, SQL, Winforms Challenge: Greenfield Trading platform, API development, industry specific challenges Firm: Well-known Fintech Trading Platform Vendor, City of London, 30 man flat global Dev Team Pay: 80k, Bonus- 750 training budget, Pension, Life/Health, Some Flex WorkingC# Software Engineer – MultithreadingQuant … They provide valuations and pricing of derivatives to most of the buy side. This is an opportunity for an individual with a strong software development background. The applicant will be responsible for design, development and maintenance of my clients main pricing analytical library in C#. Quants Developers Must ...

large scale enterprise applications within a global financial services organisation. This is an opportunity to work on modern software engineering projects where AI assisted development is actively encouraged. You'll use tools such as GitHub Copilot, Claude or similar technologies alongside modern engineering practices to help deliver high quality … code Participate in code reviews and Agile ceremonies Troubleshoot and resolve production issues Use AI tools such as GitHub Copilot or Claude to accelerate development Contribute to continuous improvement and engineering best practice What we're looking for Strong commercial Java development experience Spring Boot and REST API ...