26 to 50 of 2,112 ECMAScript Jobs in London

Experience working as a consultant, contractor, or in client-facing technical roles Technical Expertise Deep expertise in one or more major technology frameworks: NET (C#, ASP.NET Core, .NET Framework) JavaScript/TypeScript (Node.js, React, Angular, Vue.js) Java (Spring Framework, Spring Boot, Enterprise Java) Database systems experience across both: RDBMS : SQL Server, PostgreSQL, MySQL, Oracle NoSQL : MongoDB, Cassandra, DynamoDB, CosmosDB VectorDB 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 and More ❯

If you are software engineer looking to expand your technical ability using the latest technology within a dynamic team, this role could be for you. We are a public sector/aviation focused tech consultancy based in London working alongside More ❯

deployment Provide direction and mentoring to more junior frontend engineers Collaborate with stakeholders to understand business needs and develop technical strategies Lead user interface development using HTML, CSS, and JavaScript frameworks like NextJS (React) to implement complex user interfaces with dynamic data fetching and form logic Design user-friendly interactions and interfaces using tools such as Figma Facilitate UX/… responsiveness across devices, cross-browser compatibility and performance considerations Strong understanding of browsers and web APIs including HTML Canvas, Drag and Drop, SSE, WebSockets, etc. Expertise in HTML, CSS, Javascript with the ability to write complex user interfaces using these languages. This includes knowledge of programming concepts, design patterns,, data structures, algorithms, and UI components or HTML DOM Strong understanding More ❯

and written. Effective time management, organization, and prioritization skills. Experience managing and developing engineers or technical contributors. Deep knowledge of at least one web backend language: Python, Scala, Java, JavaScript (Node.js), including tools for documentation, testing, and operations. Experience deploying applications in cloud environments like Google Cloud (preferred), AWS, Azure. Proficiency with modern development tools (git/GitHub, DevOps, monitoring … . Front-end skills: JavaScript, Typescript, React.js, Angular.js, or similar. API development using REST, GraphQL, gRPC, or similar standards. Experience with open-source web frameworks in Python, Java, Scala, or similar. Knowledge of Authentication & Authorization mechanisms like OAuth2. Experience with CI/CD pipelines and tools. Familiarity with agile development, Jira, Confluence. Preferred: Master’s degree or higher. Experience leading More ❯

code and contribute to peer code reviews and technical documentation. Preferred Education None Required Technical And Professional Expertise Experience in full-stack development, including cloud-based applications. Proficiency in JavaScript/TypeScript and modern frontend frameworks such as React.js, Angular, or Vue.js. Hands-on experience with backend development using Node.js, Python, or Java. Familiarity with AWS services such as Lambda … Terraform, CloudFormation, or AWS CDK). Knowledge of authentication methods such as OAuth, JWT, or AWS Cognito. Exposure to containerised applications using Docker, ECS, or Kubernetes. AWS TypeScript/JavaScript Svelte or similar UI framework Unit testing with Jest/Vite Automated testing with Playwright Experience with automated CI/CD pipelines Browser extension development Seniority level Seniority level Mid More ❯

RESTful API design and consumption. Collaborate on version control practices using Git, documentation, and code reviews. Desired Skills: Passion for software development and continuous learning. Some frontend experience with JavaScript/TypeScript and frameworks like React.js. Basic backend experience with Python or Node.js. Understanding of databases (relational and NoSQL). Familiarity with cloud platforms (AWS/Azure) is a plus. More ❯

RESTful API design and consumption. Collaborate on version control practices using Git, documentation, and code reviews. Desired Skills: Passion for software development and continuous learning. Some frontend experience with JavaScript/TypeScript and frameworks like React.js. Basic backend experience with Python or Node.js. Understanding of databases (relational and NoSQL). Familiarity with cloud platforms (AWS/Azure) is a plus. More ❯

platform modern and competitive. Skills & Experience Required: Degree in Computer Science, Software Engineering, or related field. 3-5 years professional experience as a Full Stack Developer. Proficiency in PHP, JavaScript, React, NEXT.js, HTML/CSS, responsive UI frameworks. Experience building scalable REST APIs using Python, Java, Golang, PHP, Node.js, etc. Knowledge of web performance tools and SEO strategies. Understanding of More ❯

of the following specific technologies: OData, REST, SOAP, FTP/SFTP, JDBC, CSV, XML, JSON, XSL, encryption standards such as PGP, x509. Minimum 5 years of experience working on JavaScript, CSS3 and HTML5 and third-party libraries such as React Js, Angular, jQuery Minimum 5 years of experience working server-side programming languages such as Net, Java, Ruby and Python More ❯

applications and cloud-native solutions, with strong experience in Java server-side technologies, including Spring Boot Proficient in writing maintainable code in multiple languages such as HTML, Java, and JavaScript/TypeScript, with a solid understanding of data structures, design patterns, and algorithms Experience with public cloud technologies, as well as a passion for automation and familiarity with CI/ More ❯

like to hear from you. Required Skills C1 English or equivalent Experience writing production-grade backend systems Experience in writing production-grade React applications Experience writing performant SQL Modern JavaScript ES2018+ TDD and all aspects of testing from unit through to integration Familiarity with CI/CD pipelines Mobile-first web development API design and consumption Agile practices Desirable Skills More ❯

level Full-Stack Development: Strong experience with C#, ASP.NET Core, TypeScript, and Vue.js (or equivalent experience with React/Angular). You’re comfortable with component-based architecture, modern JavaScript, and building scalable, maintainable solutions. Deep Architectural Knowledge: Proven experience in full-stack development with a focus on designing and implementing complex systems. You’re familiar with front-end frameworks More ❯

applications and cloud-native solutions, with strong experience in Java server-side technologies, including Spring Boot Proficient in writing maintainable code in multiple languages such as HTML, Java, and JavaScript/TypeScript, with a solid understanding of data structures, design patterns, and algorithms Experience with public cloud technologies, as well as a passion for automation and familiarity with CI/ More ❯

dependency mgmt solutions like JFrog, Nexus, etc. Good understanding on Containerisation solutions, e.g., K8, Docker, Kaniko, etc. Proficiency in at least one of the standard programming languages – Java/JavaScript, C#, Python, or similar Object-oriented programming Proficiency in at least one of the standard scripting languages – Terraform, Bash, Ansible, etc. Good understanding of Software engineering concepts, e.g., coding techniques More ❯

Role: Tech Lead – Java Location: Dublin, London – UK Responsibilities Provide technical leadership and mentorship to the team. Participate in software requirement gathering. Create and maintain technical documentation. To write high-quality code to meet customer requirements. Able to troubleshoot, identify More ❯

Role: Tech Lead – Java Location: Dublin, London – UK Responsibilities Provide technical leadership and mentorship to the team. Participate in software requirement gathering. Create and maintain technical documentation. To write high-quality code to meet customer requirements. Able to troubleshoot, identify More ❯

As a Senior Software Engineer, you will develop cool back-end software that will delight our customers and help expand the state of the art in this exciting domain! By developing highly performant, robust, and scalable web services and back More ❯

Why Join Us? We explore ways to deliver new value, foster creativity and reach beyond boundaries. We use drive and commitment to energize, engage, and inspire others. We do what is important and strive for continuous improvement, work with passion More ❯

and data-layer components, working within an Agile, cloud-based (Azure) environment. Key Responsibilities Full-stack development using C# .NET Core , Web API , Angular 9+ , HTML/CSS, and JavaScript frameworks. Build and support Microservices , Azure Service Bus integrations, and containerized services (Docker). Develop and maintain APIs, web services, and enterprise data layers. Collaborate with cross-functional teams including … and maintain existing systems; implement business-driven enhancements. Skills & Experience Required Proficient in C# .NET Core/.NET Framework Strong front-end experience : Angular 9+, responsive HTML/CSS, JavaScript RESTful APIs, Web API, Microservices Azure Cloud , Service Bus, SQL Server, Docker (preferred) Familiarity with Entity Framework , GraphQL, and ETL processes Experience with Unit Testing , mocking frameworks, and secure coding More ❯

and data-layer components, working within an Agile, cloud-based (Azure) environment. Key Responsibilities Full-stack development using C# .NET Core , Web API , Angular 9+ , HTML/CSS, and JavaScript frameworks. Build and support Microservices , Azure Service Bus integrations, and containerized services (Docker). Develop and maintain APIs, web services, and enterprise data layers. Collaborate with cross-functional teams including … and maintain existing systems; implement business-driven enhancements. Skills & Experience Required Proficient in C# .NET Core/.NET Framework Strong front-end experience : Angular 9+, responsive HTML/CSS, JavaScript RESTful APIs, Web API, Microservices Azure Cloud , Service Bus, SQL Server, Docker (preferred) Familiarity with Entity Framework , GraphQL, and ETL processes Experience with Unit Testing , mocking frameworks, and secure coding More ❯

next. Our Tech & Tools AWS, AWS Serverless, Azure AWS CDK for C#, SST ECS, Linux, Ansible, Packer New Relic, Insight Hub Product Development Stacks: Ruby, Ruby on Rails, Ember.js, JavaScript NodeJS, TypeScript, Angular, TailwindCSS .NET 7, Blazor WebAssembly Puma, Sidekiq Postgres, Redis GitHub, AzureDevOps, Slite, Slack How You'll Make An Impact We are looking for a talented senior software … Bring With You Senior-level engineer with 5+ years of experience Strong at developing web applications using an object-oriented language like Ruby, being familiar with Ruby on Rails, JavaScript, HTML and CSS Experience working with Single Page Applications and Javascript frameworks such as React, Angular, Vue.js or (preferably) Ember.js Desirable: A robust knowledge of building and working with RESTful More ❯

and data-layer components, working within an Agile, cloud-based (Azure) environment. Key Responsibilities Full-stack development using C# .NET Core , Web API , Angular 9+ , HTML/CSS, and JavaScript frameworks. Build and support Microservices , Azure Service Bus integrations, and containerized services (Docker). Develop and maintain APIs, web services, and enterprise data layers. Collaborate with cross-functional teams including … and maintain existing systems; implement business-driven enhancements. Skills & Experience Required Proficient in C# .NET Core/.NET Framework Strong front-end experience : Angular 9+, responsive HTML/CSS, JavaScript RESTful APIs, Web API, Microservices Azure Cloud , Service Bus, SQL Server, Docker (preferred) Familiarity with Entity Framework , GraphQL, and ETL processes Experience with Unit Testing , mocking frameworks, and secure coding More ❯

International on a. This is a hands-on leadership role suited to a self-starter with strong technical expertise and a passion for building robust, scalable solutions using Node.js, JavaScript/TypeScript, and React. The successful candidate will be responsible for guiding technical direction, mentoring developers, fostering a high-performing team culture, and owning end-to-end project delivery. You … a related discipline - or equivalent practical experience. 8+ years of professional experience in software development, with demonstrable technical leadership. Essential Experience : Strong hands-on experience with Node.js, TypeScript/JavaScript, React (or Remix), SQL/NoSQL databases, and CSS. Proven track record of leading Agile development teams. Experience designing and building cloud-based, scalable applications. Familiarity with test-driven development More ❯

International on a. This is a hands-on leadership role suited to a self-starter with strong technical expertise and a passion for building robust, scalable solutions using Node.js, JavaScript/TypeScript, and React. The successful candidate will be responsible for guiding technical direction, mentoring developers, fostering a high-performing team culture, and owning end-to-end project delivery. You … a related discipline - or equivalent practical experience 8+ years of professional experience in software development, with demonstrable technical leadership Essential Experience : Strong hands-on experience with Node.js, TypeScript/JavaScript, React (or Remix), SQL/NoSQL databases, and CSS Proven track record of leading Agile development teams Experience designing and building cloud-based, scalable applications Familiarity with test-driven development More ❯