76 to 100 of 2,157 ECMAScript Jobs in London

Senior Software Engineer/Developer (Full Stack JavaScript) London to £100k Opportunity to progress your career in a senior, hands-on Software Engineer role at a scale-up tech company, that enables smart matching for commercial van drivers and consumers, via job bidding and route optimisation, streamlining processes and delivering CO2 carbon neutral targets, the company has been established … technology team to design and develop, troubleshoot and solve complex software issues to help scale and future proof the business. You'll work across the full tech stack using JavaScript and Vue.js on the front end, there's a range of other tech in the stack (TypeScript, Node.js, Java, Python and of course a bit of legacy PHP!), you'll … and the other two work from home. When in the office you can enjoy the onsite gym, barista coffee and free breakfast. About you: You have strong full stack JavaScript development skills and are happy to work on projects that could be weighted either way or a 50/50 split You have experience with JavaScript frameworks they use Vue.js More ❯

Senior Software Engineer/Developer (Full Stack JavaScript) London to £100k Opportunity to progress your career in a senior, hands-on Software Engineer role at a scale-up tech company, that enables smart matching for commercial van drivers and consumers, via job bidding and route optimisation, streamlining processes and delivering CO2 carbon neutral targets, the company has been established … technology team to design and develop, troubleshoot and solve complex software issues to help scale and future proof the business. You'll work across the full tech stack using JavaScript and Vue.js on the front end, there's a range of other tech in the stack (TypeScript, Node.js, Java, Python and of course a bit of legacy PHP!), you'll … and the other two work from home. When in the office you can enjoy the onsite gym, barista coffee and free breakfast. About you: You have strong full stack JavaScript development skills and are happy to work on projects that could be weighted either way or a 50/50 split You have experience with JavaScript frameworks they use Vue.js More ❯

Full Stack Engineer (Web Developer or DevOps) - Python & JavaScript Application Deadline: 11 May 2025 Department: Tech Hub Employment Type: Full Time Location: London Description Contract type: Permanent Hours: 37.5 hours Salary: circa £65,000 depending on experience Location: Canary Wharf WFH policy: Employees are required to attend the office 2 days/week Flexible working: Variety of flexible work patterns … Translate designs and wireframes into high quality code. Develop new user-facing features using frameworks such as React.js (other frameworks will be considered). Write front-end components using JavaScript, CSS and integrate with back-end Python components (possibly other languages). Develop modules that satisfy the functional and non-functional requirements. Prepare, review and build reusable components and front … Essential: At least 3 years’ experience of coding in a Python web-development framework, preferably Django. At least 3 years’ experience of coding in a front-end capacity (preferably JavaScript and React). Container-related tools – e.g., Docker, Docker Compose. Databases – e.g., SQL, PostgreSQL. RESTful API development and management. Proactive Performance Tuning. Solid understanding of design patterns and relevant implementation More ❯

Contract type: Permanent Hours: 37.5 hours Location: Canary Wharf WFH policy: Employees are required to attend the office 2 days/week Flexible working : Variety of flexible work patterns subject to line manager discretion e.g. Compressed 9-day fortnight. Reports More ❯

a Full Stack Developer or similar role Experience developing desktop and mobile applications Familiarity with common stacks Knowledge of multiple front-end languages and libraries (e.g. HTML/CSS, JavaScript, XML, jQuery) Knowledge of multiple back-end languages (e.g. C#, Java, Python) and JavaScript frameworks (e.g. Angular, React, Node.js) Familiarity with databases (e.g. MySQL, MongoDB), web servers (e.g. Apache) and More ❯

enjoying what the world has to offer About the Role: Tech Stack: Backend: AWS Lambda, API Gateway, DynamoDB, S3, Node.js Frontend: React/Next.js, React Native Programming Languages: TypeScript; JavaScript, Python Infrastructure: Terraform, GitHub CI/CD pipelines Responsibilities: Design, develop, and maintain advanced applications using React Native. Collaborate with cross-functional teams to define, design, and ship new features. … and Android platforms, having a deep understandingof the ecosystem differences. Familiarity with RESTful APIs and mobile libraries for networking. Experience with performance and memory tuning tools. Strong proficiency in JavaScript, including DOM manipulation and the JavaScript object model. Experience with automated testing suites, like Jest or Mocha. Excellent problem-solving skills and the ability to think algorithmically. Experience with cloud More ❯

requires a solid understanding of software development principles, from UI/UX considerations to backend architecture and integrations. You will primarily design and implement APIs and services using Node.js , JavaScript , and TypeScript , and contribute to frontend development using React . A key aspect of this role is the ability to effectively understand and work WITH AI-powered developer tools (e.g. … data sources. Optimize application performance, reliability, and scalability. Work with data at scale and integrate it into internal pipelines and systems. Frontend Development: Develop user-friendly interfaces using React , JavaScript/TypeScript , and ensure optimal performance across various devices and browsers. Implement responsive designs and ensure seamless integration with backend services. Full-Stack Contributions: Collaborate with cross-functional teams to … a related field, or equivalent practical experience. Experience: 2-4 years of proven experience in a software engineering role. Solid experience in full-stack development, with demonstrable skills in JavaScript , TypeScript , Node.js (for backend), and React (for frontend). A stronger inclination and experience towards backend development is preferred. Proficiency in building and consuming RESTful APIs; familiarity with GraphQL is More ❯

against cyber-attacks. Are you ready to join us on the journey to elevate Everywhere Work? Why We Need you! Ivanti is seeking a Staff Software Engineer - UI, Angular, JavaScript to enhance the user experience of our Enterprise Service Management platform. The ideal candidate should have 10+ years of experience in software development, preferably in enterprise-level product cloud applications. … later (or equivalent MVVM framework) for front-end development. Mentor junior developers. Translate stakeholder requirements into technical solutions. Who You Are Highly skilled in developing user interfaces with modern JavaScript frameworks like Angular or React. Proficient in performance tuning and network application architecture. Creative problem solver with strong organizational skills. Effective communicator and collaborative team player. Passionate about emerging technologies … Role, You Will Have: Bachelor’s or master’s Degree in computer science or computer engineering. 10+ years of experience in software development. Strong skills in HTML/CSS, JavaScript, and optionally .NET Core. Solid understanding of web application security, session management, and best practices. Knowledge of relational databases, Object-Oriented Programming, and web development. Experience with network diagnostics and More ❯

advanced data solutions. Lead the architecture, development, and maintenance of comprehensive data integration systems, employing efficient ETL processes using Python, Pandas, and NumPy for large-scale data manipulation. Apply JavaScript or another object-oriented language (e.g., Python, C#) in client environments to seamlessly integrate various system functionalities. Proactively test, diagnose, and refine software applications alongside clients, aiming for high quality … all the necessary training and support) A bachelor’s degree in computer science, a related field, or an equivalent combination of education and experience. Proficient in software development with JavaScript and Python. Experience with CI/CD practices and version control systems, preferably GitLab. Strong experience in shell scripting and cron job scheduling for automating data processes. Solid background in … working with various JavaScript frameworks (e.g., React, Redux, Vue, Backbone, Angular). Experience in deploying software on leading cloud computing platforms (such as GCP, AWS, Azure). Understanding of both SQL and NoSQL database technologies. Strong skills in data structures, algorithm design, and implementation. Proficiency in handling and analyzing time-series data, including its cleansing and normalization. Familiarity with Agile More ❯

unable to sponsor a work visa for this role. You must have existing UK work authorization. Key Responsibilities Design, develop, and maintain backend services and APIs using TypeScript/JavaScript (Node.js) Build and query data models using MongoDB and Redis Develop, containerize, and deploy applications using Docker Collaborate with product, design, and engineering teams to deliver new features Write clean … improvements and automation Monitor, debug, and optimize applications in cloud environments (e.g., AWS ) Required Skills & Experience 3–5+ years of professional software engineering experience Strong experience with TypeScript and JavaScript (Node.js) Proficiency in Docker and containerized development workflows Solid understanding of Git and version control best practices Experience working with NoSQL databases, especially MongoDB and Redis Familiarity with AWS services More ❯

aspect of Tripadvisor technology stack: from in-house systems to the cloud, from Java microservices to CI/CD frameworks. The ideal candidate will be proficient in TypeScript and JavaScript and Java with Spring Boot, Docker and Kubernetes being highly desirable. Experience with AWS or other cloud solutions is preferred. This role focuses on maintaining and enhancing our integration with … Participate in code reviews, testing, and debugging to ensure high-quality software development. Skills And Experience 3-5 years of professional experience in software development. Strong proficiency in TypeScript, JavaScript, Java. Experience with Spring Boot, Relational and noSQL database, Docker and Kubernetes is desirable. Knowledge of networking principles and cloud architecture (AWS, GCP, or similar) is a plus. Excellent communication More ❯

security, and performance. Provide technical guidance and mentorship to other engineers, ensuring code quality through reviews and best practices. Design and implement responsive, user-friendly web interfaces using modern JavaScript frameworks (Next.js, React). Collaborate with UX/UI designers to turn designs into functional, intuitive interfaces. About You: Expertise in JavaScript frameworks like React, Vue.js, or Angular, with proficiency More ❯

with 2nd line support function to troubleshoot, fix and refactor issues in live systems About You Detailed knowledge of all aspects of application development, including C#, HTML, CSS and JavaScript with an emphasis on development using the Angular framework and the RxJS library. Significant experience creating and interacting with RESTful APIs via C# and Javascript interfaces Solid knowledge of SQL More ❯

in shaping the technical direction, improving our product metrics, and ensuring best practices across our web stack. You will report to the Engineering Manager and work primarily on our JavaScript/Typescript stack to expand our e-commerce website, internal websites, RESTful APIs, and subscription services. We do sprints and standups, communicate a lot, support each other, value each other … inquisitive mind and demonstrable examples of implementing proactive solutions. Excellent interpersonal and communication skills with employees at all levels and good written English. Technical skills: Must Frontend: HTML, CSS JavaScript (ES2020+), TypeScript SolidJS or React Unit-testing (Vitest/Jest/similar) End-to-end testing (Cypress/Playwright/similar) Backend : RESTful APIs Node.js SQL and/or NoSQL More ❯

a great fit for our team: 5+ years of hands-on experience in object-oriented programming languages (e.g., C#, C++) 5+ years of real-world experience with modern frontend JavaScript, libraries, and frameworks (e.g., JavaScript, HTML, CSS, React, Vue, TypeScript) Comfortable designing and implementing database solutions with experience in both SQL and NoSQL databases A keen interest in developing a More ❯

nd line support function to troubleshoot, fix and refactor issues in live systems About You Detailed knowledge of all aspects of application development, including C#, HTML, CSS and JavaScript with an emphasis on development using the Angular framework and the RxJS library. Significant experience creating and interacting with RESTful APIs via C# and Javascript interfaces Solid knowledge of SQL Server More ❯

Senior Full Stack Engineer London, UK - Fully Onsite Key Technologies: Java, JavaScript, React, Docker, Kubernetes Perm Role | £80,000 - £120,000 Harrington Starr has partnered with a leading financial institution on a mission to transform investment banking through cutting-edge technology. Their Investment Banking Middle Office Technology team plays a crucial role in enabling efficient trade management with institutional counterparties. More ❯

Senior Full Stack Engineer London, UK - Fully Onsite Key Technologies: Java, JavaScript, React, Docker, Kubernetes Perm Role | £80,000 - £120,000 Harrington Starr has partnered with a leading financial institution on a mission to transform investment banking through cutting-edge technology. Their Investment Banking Middle Office Technology team plays a crucial role in enabling efficient trade management with institutional counterparties. More ❯

software solutions. .NET Developer applicants should have commercial experience with: .NET, .NET Core/ASP.NET MVC, C#, Azure SQL and Agile. Full training will be provided into: .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. If you are dedicated to the youthful optimism More ❯

software solutions. .NET Developer applicants should have commercial experience with: .NET, .NET Core/ASP.NET MVC, C#, Azure SQL and Agile. Full training will be provided into: .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. If you are dedicated to the youthful optimism More ❯

software solutions. .NET Developer applicants should have commercial experience with: .NET, .NET Core/ASP.NET MVC, C#, Azure SQL and Agile. Full training will be provided into: .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. If you are dedicated to the youthful optimism More ❯

between product, engineering and architecture. Qualifications And Skills Strong experience with Azure Cloud and Azure services Technical expertise in one or more technology domains and programming languages (e.g. Java, Javascript), database technologies (e.g. MongoDB, PostgreSQL, MySQL) and release & configuration management tools. Technical expertise in JavaScript frameworks (Remix.js. Node.js, React.js) Understanding of headless CMS architecture, i.e. Contenful Experience with scripting languages More ❯

C# applications. .NET Developer applicants should have a skill set that encompasses: .NET, .NET Core/ASP.NET MVC, C# and Azure SQL. Our client offers training in: .NET 9, JavaScript, React, Angular 19, Microservices, MongoDB, Vue.js, TypeScript, Azure, AWS, Web API 2, Entity Framework, Node.js, Elasticsearch, Agile, TDD, BDD, Scrum, Kanban and MongoDB. This is a truly amazing opportunity to More ❯

.NET, .NET Core/ASP.NET MVC, C# and Azure SQL. Knowledge of software development methodologies is of interest (Agile, Scrum). My client will provide training in: .NET 9, JavaScript, React, Angular 19, Microservices, MongoDB, Vue.js, TypeScript, Azure, AWS, Web API 2, Entity Framework, Node.js, Elasticsearch, Agile, TDD, BDD, Scrum, Kanban and MongoDB. This is a truly exciting project, one More ❯

candidates with experience in either web application development (.NET Core/ASP.NET MVC, C#) or windows/desktop development (C#.NET). My client can provide training in: .NET 9, JavaScript, React, Angular 19, Microservices, MongoDB, Vue.js, TypeScript, Azure, AWS, WPF, MVVM, Prism, continuous integration, dependency injection, RESTful, Web API 2, Entity Framework, Node.js, Elasticsearch, Agile, TDD, BDD, Scrum, Kanban and More ❯