101 to 125 of 2,112 ECMAScript Jobs in London

Modern CI/CD pipelines, microservices, and cloud-based environments (e.g. AWS or Azure) Geospatial stack (preferred): Leaflet, Mapbox, OpenLayers, PostGIS, GeoJSON, WMS/WFS Requirements: Extensive experience in JavaScript development, particularly with Node.js and React Proven track record delivering complex, high-quality fullstack web applications Experience building and maintaining RESTful APIs Solid understanding of asynchronous programming, microservices, and containerized More ❯

Our client is looking for passionate .NET Developer with experience in .NET, .NET Core/ASP.NET MVC, C# and Azure SQL. Our client will provide training in: .NET 9, JavaScript, React, Angular 19, Microservices, Vue.js, TypeScript, Azure, AWS, Web API 2, Entity Framework, Node.js, Elasticsearch, Agile, TDD, BDD, Scrum, Kanban and MongoDB. This is your opportunity to be part of More ❯

some experience with Docker/Kubernetes, EKS You have a good understanding of CQRS and event driven architectures Ideally you will also have some front end development experience with JavaScript/TypeScript/React.js or Angular You have strong analytical and problem solving skills You're collaborative with excellent communication skills What's in it for you: As a Backend More ❯

some experience with Docker/Kubernetes, EKS You have a good understanding of CQRS and event driven architectures Ideally you will also have some front end development experience with JavaScript/TypeScript/React.js or Angular You have strong analytical and problem solving skills You're collaborative with excellent communication skills What's in it for you: As a Backend More ❯

degree in Computer Science or a related field. 7+ years of experience in software development. Work experience using both compiled languages (Rust, OCaml, Golang, Java, C#) or dynamic languages (JavaScript, Python, Ruby). Experience building web applications or desktop application technologies such as Electron, Tauri, React, or Vue.js. Familiarity with CI/CD principles and technologies, including experience with GitHub More ❯

and peers in scrum meetings. Technical Stack: ASP.NET 4.6+ MVC 5 C# 6+ including advanced language features (generics, lambdas, delegates) Entity Framework 6+ SQL Server 2014+ TDD/NUnit JavaScript/jQuery/AJAX, HTML5, CSS3 Design Patterns and SOLID Principles Desirable experience: ASP.NET Core, Entity Framework Core Azure Service Bus Vue, AngularJS Agile methodologies/Scrum Automated browser testing More ❯

fluency is essential. You’ll collaborate with product managers, designers, and senior engineers to understand project goals and deliver high-quality solutions. You’ll work with technologies like Node.js, JavaScript, TypeScript, and React, and play a key role in leveraging AI-powered development tools (such as GitHub Copilot, Cursor, Claude Code, or Gemini) to improve efficiency and code quality. We More ❯

fluency is essential. You’ll collaborate with product managers, designers, and senior engineers to understand project goals and deliver high-quality solutions. You’ll work with technologies like Node.js, JavaScript, TypeScript, and React, and play a key role in leveraging AI-powered development tools (such as GitHub Copilot, Cursor, Claude Code, or Gemini) to improve efficiency and code quality. We More ❯

improve skills and product quality Required Technical Skills Full-Stack and Backend developers with proficiency and experience in Python Full-Stack and Frontend developers with proficiency and experience in JavaScript/TypeScript Experience with React and next.js or similar front-end frameworks Familiarity with AWS and cloud-native development Experience with automated testing and writing testable code Understanding of CI More ❯

Minimum 8 years of commercial software development experience, with at least 3 years in a senior or technical lead role. 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 More ❯

Minimum 8 years of commercial software development experience, with at least 3 years in a senior or technical lead role. 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 More ❯

expertise in one of the core programming languages (Java, Python, etc) Designing, implementing, and managing databases (MySQL, PostgreSQL, MongoDB). Creating user interfaces using languages like HTML, CSS, and JavaScript, along with frameworks like React, Angular or Vue Developing and deploying applications within cloud environments ( AWS, Azure, Google Cloud), utilizing cloud services for storage, compute, and other functionalities Good understanding More ❯

to enhance user experience Making key technical decisions that will shape the platform's future Technical Requirements Must Have: Strong experience with PHP and WordPress development Proficiency in modern JavaScript, HTML5, and CSS3 Experience with Laravel framework Familiarity with React and modern frontend development Understanding of RESTful APIs and microservices architecture Experience with AWS services and cloud architecture Strong knowledge More ❯

deliver scalable, secure, and efficient backend solutions. The ideal candidate will have solid experience in CI/CD pipelines, cloud infrastructure (especially AWS), and modern backend architectures. Exposure to JavaScript and PHP is desirable, and familiarity with event-driven or microservice-based patterns is a plus. We are also looking for someone who can bring experience or interest in AI More ❯

solutions on our clientu2019s bottom line Great interpersonal skills; able to communicate at all levels of seniority and levels of technical understanding SKILLS Influencing technical decisions in a project JavaScript without frameworks Attention to detail and producing pixel perfect implementation of designs A strong work ethic; able to work under pressure and juggle multiple responsibilities to meet deadlines and deliver More ❯

across the organization to deliver high-quality applications. Take ownership of assigned deliverables, ensuring work is delivered iteratively while embracing Agile principles. Qualifications Knowledge and Skills: Strong proficiency in JavaScript (ES6+), with a deep understanding of core language concepts and best practices. Expertise in modern frontend frameworks with advanced experience in React, Next.js, and Angular. Deep understanding of TypeScript for More ❯

Cloud Expertise: Extensive experience with AWS and Azure services, including compute, storage, networking, and cloud- frameworks. Programming Proficiency: Hands-on experience with programming and frameworks such as Python, Java, JavaScript, React, Node.js, and Terraform etc. PoC and Rapid Iteration Experience: Proven ability to lead and execute proof-of-concept projects with a focus on practical results and business alignment. Design More ❯

advocating high quality of code. Essential: Technical Skills: C# .NET ASP .NET MVC LINQ and Entity Framework/LINQ to SQL Web-based languages such as HTML, CSS and JavaScript SQL Server Web APIs, e.g. REST Source control management, e.g. Git/Azure/Azure DevOps Unit tests, e.g. XUnit OOP ad SOLID principles Behavioural Skills: Proactive self-starter, who More ❯

willing to help grow and guide junior engineers towards appropriate target architectures Strong programming skills with a good working knowledge of Java & Spring Boot microservices and/or modern JavaScript libraries, such as ReactJS, as well as a proficient understanding of modern engineering toolsets like Kubernetes and Jenkins Knowledge of java development standard methodologies and patterns with an understanding of More ❯

test automation (API testing, UI testing [cucumber, nightwatch]) Nice to have skills: AWS Knowledge of Open Source BPMN workflow engines (Camunda, Activiti or Flowable) Experience on a front-end javascript framework such as react, angular or vue.js RedHat OpenShift for container orchestration Knowledge of NCSC’s 14 cloud security principles. SC Clearance: Zaizi works with UK Central Government departments on More ❯

development Experience of financial/trading platforms and knowledge of financial markets Knowledge of FIX protocol and ability to handle FIX interactions Experience with AWS services Experience with Java, JavaScript or React Experience with serverless architecture and microservices Experience with TDD, BDD or similar approaches Band & level: Manager, 6 #LI-MID #LI-Hybrid Not The Perfect Fit? Concerned that you More ❯

5+ years of experience in software engineering, including excellent knowledge of C#, .NET and object oriented concepts. 3+ years of experience developing and maintaining scalable React applications using modern JavaScript frameworks and libraries (TypeScript preferred). Hands-on experience with RDBMS development. Collaboration with UX/UI designers to implement responsive and user-friendly interfaces. Adept at writing unit tests More ❯

experience. Experience in software engineering practices like Code Reviews, CI/CD Pipelines and SOLID/DRY principles. Hands-on developing/coding role using the following technologies: Frontend (JavaScript/TypeScript or Angular or React or Node). Backend (Java, SpringBoot, Hibernate, Kotlin). Experience in estimation and sizing. Integration experience. API Design experience. Cloud experience. Appetite to work More ❯

development, particularly in large-scale, cloud-based systems with CI/CD practices. You bring deep expertise in modern frontend frameworks (especially React) and essential web technologies-HTML, CSS, JavaScript, TypeScript, and accessibility (a11y). You are experienced with automated testing and familiar with TDD. You've worked in product-centric teams that prioritise strong engineering principles like TDD and More ❯

systems Designing, developing, and executing industrial User Interfaces and Experiences (UI/UX) Software frameworks: Both .NET with C# for Windows Forms GUI developments; Blazor would be a plus. Javascript frameworks (React.JS, Node.JS or Angular.JS) for Web-GUI development Cloud front-end and back-end development, ideally with Amazon Web Service Databases Cloud-based architectures and applications Other software-tech More ❯