1 to 25 of 83 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 ...

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 ...

.NET Developer – London - £500-550 per day (.NET, C#, SQL, AWS, API Development) We’re working with an industry leading e-commerce site that are looking for several .NET Developers to join them for an initial 6-month projects as part of an ongoing transformation. These roles will … hosted solutions. Working alongside existing engineering teams that already own the services and understand the business logic. Technical requirements C# .NET/.NET Core API development SQL .NET upgrade programmes Cloud-native migrations Interview slots are available for next week. (.NET, C#, SQL, AWS, API Development ...

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 ...

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 ...

About the OpportunityWe are looking for an Engineering Manager to lead a high-performing, remote-first API development team based in Europe who are driving Contentful’s REST and GraphQL APIs that enable customers to manage and deliver content at scale. The role will focus on continuously evolving … driven capabilities. We aim to help customers accelerate innovation, reduce operational complexity, and unlock new growth opportunities through a secure, performant, and extensible API ecosystem.You’ll partner closely with cross-functional teams to ensure alignment between technical goals and business objectives, driving scalable, high-performance APIs that power Contentful ...

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 ...

recruit a Senior Solutions Architect to based at the Company’s Central London Offices. You will extensive and deep Expertise in following Application Development areas: Expertise in application architecture using modern technologies such as cloud native development, 12 factor Apps, microservices, serverless, API management, Kafka, etc. Deep … knowledge of Microservices, Containers, REST APIs development, API Management tools (e.g. MuleSoft, Apigee), Kafka Solution architect with broad expertise in wide range of digital technologies in areas of application platform development, web and mobile development, cloud, integration, security, etc. Application dev experience with at least ...

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 ...

seeking an experienced Java Developer Contractor to join a high-profile technology delivery programme. This is an exciting opportunity to work on the design, development, and enhancement of enterprise-scale applications within a collaborative Agile environment. The successful candidate will play a key role in delivering high-quality, scalable … secure software solutions, working closely with Architects, Business Analysts, Product Owners, QA teams, and DevOps engineers. You'll be involved throughout the full software development lifecycle, helping to translate business requirements into robust technical solutions that support critical business outcomes. The Role As a Java Developer, you will ...

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 ...

ASP.NET Developer – FintechTech: C# .net, Azure, SQL, Team City, GIT, TFS Challenge: Greenfield Trading platform, API development, industry specific challenges Firm: Well-known Insurtech software business, London, 10 man flat Dev Team Salary: 65,000Quant is urgently looking for an 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 a well known fintech software house in central London.This is an expansionary role building a greenfield financial modelling platform used by major finance business’.Working together with our team leads, solution ...

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 ...

Finance, Risk, and Controllers. This strategic journey requires a highly motivated and accomplished Senior Vice President, Full Stack Engineering Lead to drive the design, development, and delivery of a next‐generation platform. The solution will be built from the ground up, leveraging cutting‐edge technologies including Java, Spring Boot … React. What you’ll do Software Development: Design, develop, test, and deploy high‐quality, scalable, and maintainable code. Quality Advocacy: Promote best practices for engineering excellence in coding, testing, build, deployment, and the maintenance of high‐quality software. Solution Implementation: Act as an active contributor to design ...

including Finance, Risk, and Controllers.This strategic journey requires a highly motivated and accomplished Senior Vice President, Full Stack Engineering Lead to drive the design, development, and delivery of a next-generation platform. The solution will be built from the ground up, leveraging cutting-edge technologies including Java, Spring Boot … React.**What you’ll do*** **Software Development:** Design, develop, test, and deploy high-quality, scalable, and maintainable code.* **Quality Advocacy:** Promote best practices for engineering excellence in coding, testing, build, deployment, and the maintenance of high-quality software.* **Solution Implementation:** Act as an active contributor to design ...

will be working for one of our high-profile trading clients within the financial services domain, contributing hands-on to a Java-based development team supporting a high-volume message processing environment. The team is heavily Java-focused, operating within a client ecosystem that relies extensively on Kafka, Kubernetes … handling, and backpressure management. Experience designing and developing cloud-native applications with a microservices architecture running on Docker/OpenShift/Kubernetes. Strong application development skills in Java, SQL (SQL Server, Oracle, etc.) and messaging platforms such as Kafka and MQ. Experience with the Spring framework and Spring Boot ...

Tech: C# 5, Visual Studiuo, AWS, Angular.JS, Bootstrap, Docker Challenge: Greenfield Financial platform, API development, industry specific challenges Firm: Well-known fintech50 business, City of London, 30 man flat Dev Team Pay: 70k, Bonus- training budget, Pension, Life/Health, Some Flex WorkingC# Senior Developer FintechQuant Capital … looking for a C# developer who wants to work in a tech driven bleeding edge business creating truly greenfield products. Working within the Development team the C# Developer will helping to introduce a new architecture as well as creating new products. This role also involves a clear career progression ...

commerce leader for cultural experiences, connecting millions of customers with the best in live entertainment. About the role Frieze has a small in-house development team working across our suite of digital platforms, collaborating closely with specialist agencies and partners. The Technical Lead will take ownership of the technical … collaborate closely with teams across Frieze - including Data, Marketing and VIP - to deliver against our roadmap. We are increasingly using AI tooling to improve development speed and workflows, and the Tech Lead will be expected to champion and embed these practices across the team. The role would suit ...

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 ...

technical stakeholders Contribute to CI/CD and automated deployment Support production systems and continuous improvement What we're looking for Strong commercial Java development experience Spring Boot and Microservices REST API development SQL and database design Oracle experience Unix or Linux JUnit and automated testing ...

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. ...

seeking a Senior Applications Developer to join a team delivering pricing solutions for the Foreign Exchange (FX) business. You will cover the full software development lifecycle — analysis, design, implementation, and testing — while providing technical leadership to the team.**Primary Responsibilities*** Design and develop high-quality trading GUIs providing compelling … applications using FDC3, and REST/WebSocket APIs. Experience with OpenFin or Interop is desirable but not essential.* Drive AI integration within the development lifecycle — including AI-assisted coding, automated test generation, and intelligent monitoring* Influence performance engineering across the UI stack: profiling, rendering optimisation, bundle analysis ...

seeking a Senior Applications Developer to join a team delivering pricing solutions for the Foreign Exchange (FX) business. You will cover the full software development lifecycle — analysis, design, implementation, and testing — while providing technical leadership to the team. Primary Responsibilities Design and develop high-quality trading GUIs providing compelling … applications using FDC3, and REST/WebSocket APIs. Experience with OpenFin or Interop is desirable but not essential. Drive AI integration within the development lifecycle — including AI-assisted coding, automated test generation, and intelligent monitoring Influence performance engineering across the UI stack: profiling, rendering optimisation, bundle analysis ...

that is easy to test, maintain, and extend across both front‐end and back‐end services. Drive quality through excellent automated testing practices, including API testing to enable continuous deployment. Understand how modern web applications work end to end, from browser HTTP requests and API calls through … features. Core Competencies Demonstrates expertise in building scalable back‐end services and APIs using Java and Spring Boot, while also possessing strong front‐end development skills with React, TypeScript, and modern testing practices. Proficient in leveraging AWS for high‐performance solutions and utilizing AI tools to enhance product features ...