1 to 25 of 35 API Development Jobs in London

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

scale. About the Role As a Founding Engineer, you will have responsibility across the entire technical stack — from architecture and infrastructure through to product development and optimisation. You will operate with a high degree of autonomy, solving difficult engineering problems and establishing the foundations of the company’s technology. … systems. Solve complex technical challenges with speed and precision. Build prototypes, test ideas and rapidly iterate towards production solutions. Establish engineering standards, tooling and development practices. Optimise systems for performance, reliability and scalability. Work directly with founders to shape product strategy and technical direction. Take ownership of projects from ...

backend services, APIs, and integrations that support millions of customer payment journeys every year. Own features end-to-end, taking responsibility for solution design, development, testing, deployment, and production support. Help shape the technical direction of the Payments platform, balancing performance, scalability, resilience, security, and cost through modern engineering … quality, testing, and maintainability. Proficient in driving operational excellence through observability and modern engineering practices. Highest-signal resume keywords Java Engineering Expertise Backend Service Development API Design and Integration CI/CD Implementation Observability and Monitoring Hard Skills Backend Development API Development System Design Scalable ...

high-performance authentication and identity services used by millions of customers and colleagues. Own features end-to-end, taking responsibility for solution design, development, testing, deployment, monitoring, and production support. Help shape the technical direction of the Identity Platform, balancing customer experience, security, performance, and developer usability. Develop resilient … significant experience building and operating large-scale distributed systems serving millions of users. Strong experience with Java and/or Kotlin and modern backend development frameworks. in designing and delivering secure, scalable services within cloud-native environments. Strong understanding of DevOps principles, CI/CD pipelines, automation, and operational ...

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 ...

though also like the idea of the equally important social/client-facing aspect of the role. The role is responsible for defining the development architecture across a blend of in-house bespoke solutions and 3rdparty products and helping to shape the longer-term strategic development architecture … developing architecture strategy and target architecture model. You will be working closely with delivery team members to coach and promote best-practice solution development architecture as well as supporting business analysts and product owners in planning and story-mapping for new development. You will act as technical design authority ...

critical business applications built on modern Microsoft technologies, including .NET 6 and .NET 8. The successful candidate will work within a globally distributed development team, collaborating with both technical and business stakeholders across the UK (London, Bromley, Camberley) and internationally (Singapore, India, New York, and Chicago). The role … stability, performance, and scalability. Work closely with business users, analysts, and technical teams to gather requirements and deliver solutions. Participate in the full software development lifecycle, including design, development, testing, deployment, and support. Collaborate with globally distributed development teams across multiple locations and time zones. Contribute ...

critical business applications built on modern Microsoft technologies, including .NET 6 and .NET 8. The successful candidate will work within a globally distributed development team, collaborating with both technical and business stakeholders across the UK (London, Bromley, Camberley) and internationally (Singapore, India, New York, and Chicago). The role … stability, performance, and scalability. Work closely with business users, analysts, and technical teams to gather requirements and deliver solutions. Participate in the full software development lifecycle, including design, development, testing, deployment, and support. Collaborate with globally distributed development teams across multiple locations and time zones. Contribute ...

about building reusable backend capabilities that enable multiple teams and products. Strong understanding of distributed systems, event-driven architectures, and asynchronous messaging patterns. Designed API-first platforms with GraphQL and REST-based services. Comfortable working with high-volume transactional systems where reliability, performance, and resilience are critical. Core Competencies … driven architectures. Proficient in Java and Kotlin, with a solid understanding of distributed systems and high-volume transactional environments. Highest-signal resume keywords Java Development Kotlin Development Microservices Architecture GraphQL API Design Event-Driven Architecture ATS Optimization Keywords Hard Skills Backend Engineering API Development Distributed ...

APIs Event-driven architecture Streaming data Distributed systems Real-time data processing About You We're looking for engineers with experience in: Commercial Python development Java development Cloud platforms (GCP preferred, although AWS or Azure experience is also valuable) Docker and containerised applications REST API development ...

Architect to take a leading role in designing robust, scalable, and innovative technology solutions for our clients. You will work closely with stakeholders and development teams to ensure the alignment of technology with business goals, while championing best practices in architectural design and delivery. Key Responsibilities: Collaborate with development … lead and influence technical discussions Proven experience as a Technical Architect or similar role In-depth knowledge of system design, software architecture, and development methodologies Experience with cloud platforms (e.g., AWS, Azure, Google Cloud) Expertise in architectural design, data pipelines, cloud platforms, and API development Knowledge ...

internet—the fundamental infrastructure that allows digital platforms to verify age and manage compliance globally without friction. Our core platform, anchored by the Compliance Development Kit (CDK) and AgeKit, is the trusted engine for the world’s largest game publishers and digital ecosystems. We replace fragmented, manual compliance with … unified API that handles age verification, parental consent, and regulatory logic across 200+ markets. Backed by top-tier venture capital firms like a16z and Lightspeed, k-ID is entering a phase of growth to define the standard for global digital safety. About The Role As an Forward Deploy Engineer ...

directly influence customer experience, operational efficiency and commercial performance. The Role You'll take ownership of the organisation's digital ecosystem including: WordPress website development and maintenance CRM administration (HubSpot) API development and third-party integrations Website security, hosting and performance Marketing technology stack Business reporting … dashboards AI-powered workflow automation Release management and version control Technical liaison with external development partners Working closely with the Head of IT and senior commercial stakeholders, you'll play a pivotal role in delivering new digital initiatives whilst ensuring the existing platform remains secure, scalable and high performing. ...

impact National Security programmes Exposure to large-scale AWS cloud and DevOps environments Flexible and hybrid working arrangements Dedicated Career Manager and structured career development Access to extensive training and learning platforms Company bonus scheme 25 days annual leave with buy/sell options Private medical and dental insurance … continuous learning Desirable Experience AWS certifications such as Solutions Architect, Developer or DevOps Engineer Experience with Docker, Kubernetes, ECS or EKS Microservices and API development experience CI/CD tooling such as Jenkins, Bamboo, TeamCity or Bitbucket Automated testing practices and frameworks Understanding of Linux, networking and infrastructure ...

Lead the design, development, and delivery of enterprise software solutions for Public Sector customers. This role combines deep technical expertise, integration experience, and customer-facing delivery in compliance-driven environments. Qualifications Experience: 8–12 years in software engineering, preferably in regulated environments. Strong expertise in Microsoft technology stack (ASP.NET … API, SQL Server) Solid understanding of client-side scripting (TypeScript, JavaScript, jQuery) Working knowledge of Python, Azure stack Experience with GitHub, CI/CD, DevOps Expertise in design patterns and REST API development Ability to deliver software and artifacts independently Experience in complex software troubleshooting techniques Integration ...

solutions providing market-leading services for our colleagues, customers and advisers. What you'll do The Engineer is responsible for the design and development of strategic software solutions, ensuring that requirements are met, best practices are followed and that all software developed is of a high quality and robust … nature. Working with Project Managers, Product Owners, Architects, Business Analysts and Testers the successful .Net Engineer will share responsibility for project feasibility, requirements, design, development, quality and delivery. They will need to work positively and effectively within teams of mixed abilities and experience and be adaptable within changing environments. ...

implementing IAM security controls aligned with cloud security standards, utilizing AWS and GCP services. Proficient in automation, CI/CD pipelines, and secure API development, with a strong foundation in Cyber Security principles and practices. #J-18808-Ljbffr ...

banking experience who is happy to be hands on (80%) and 20% architectural leadership by leading through example. Your responsibilities will include: Lead the development and implementation of a modern cloud foundation and data platform that is robust, scalable, fully automated, secure, and can support the growth … business. Build Scalable Architectures: Leverage modern technologies to design and implement scalable, secure, and high-performing cloud-native solutions. API Development and Integration: Design and build secure RESTful and GraphQL APIs, ensuring seamless integration with core banking systems (e.g., Mambu) and external services like Open Banking platforms. Data ...

banking experience who is happy to be hands on (80%) and 20% architectural leadership by leading through example. Your responsibilities will include: Lead the development and implementation of a modern cloud foundation and data platform that is robust, scalable, fully automated, secure, and can support the growth … business. Build Scalable Architectures: Leverage modern technologies to design and implement scalable, secure, and high-performing cloud-native solutions. API Development and Integration: Design and build secure RESTful and GraphQL APIs, ensuring seamless integration with core banking systems (e.g., Mambu) and external services like Open Banking platforms. Data ...

Applied AI engineering, ML engineering or software engineering background Experience with LLMs, RAG, embeddings, prompt engineering or fine tuning Exposure to LangChain, LangGraph, Agent Development Kit or similar agent frameworks Experience with vector databases such as Pinecone, Chroma or similar API development experience, ideally with FastAPI ...

seeking a Full Stack Developer to join a globally recognised organisation as part of a small development team, building and enhancing their product range. Previous commercial experience in a Full Stack development role is essential. The company offers flexible hybrid working, with just one day per month required … their London office. Technical Requirements C#/.NET React AWS or Azure API Development Agile Additional & Beneficial Skills: Salesforce Apex Please apply to this advert or email your CV direct to (url removed) Applicants must be based in the UK and possess British Citizenship, ILR or Settled Status. ...

seeking a highly skilled and innovative Lead Agentic AI Engineer to join our team and drive the design, development, and deployment of production‐grade generative AI and agentic solutions using Microsoft technologies. This role is ideal for a technically strong engineer who has hands‐on experience building AI solutions … Agent Framework Proficient in Python and production‐quality code practices Strong understanding of software engineering principles, architecture patterns, and delivery best practices Experience with API development using frameworks such as FastAPI, Flask, or Django Knowledge of Docker, containerised deployments, CI/CD, and cloud‐native delivery patterns What ...

Technical Skills: Creativity & Problem-Solving Adaptability & Flexibility Able to use AI tooling (CoPilot, Devin, Etc) to accelerate application and API development. Able to guide, analyze, correct, explain, and improve AI output. Aptitude for technology; curiosity, passion and startup mindset Practical application and understanding of computer science concepts Innovative thinking ...

client data will be sourced, validated, and integrated into Mondra, leveraging where possible our existing Import and Export APIs and identifying where custom API development may be required for fulfil Mondra’s data requirements. You will also contribute to the client contracting process, ensuring technical commitments are clearly … including mapping data sources, transformation logic, and validation processes. Identify the client’s BI requirements, and define data export strategies (preferably via existing Mondra API). Identify the authentication/authorisation capabilities of the client, and promote the integration with Mondra’s Identity Provider via Single Sign On. Leverage ...

Step into the role of a Principal Information Architect (Executive Director) at JPMorganChase and become a promoting force behind the development and adoption of cutting-edge, cloud-based technologies. Make metadata real, usable, and impactful in modern engineering. In this role, you’ll sit at the intersection of Information … influence direction through thought leadership (not people management), partnering with stakeholders to drive standards and adoption. You will help ensure models and metadata support development practices and regulatory asks in a clear, implementable way. This could suit a strong Information Architect with metadata experience and an interest in software ...