51 to 75 of 1,015 ECMAScript Jobs in London

exploratory, systems integration and user acceptance testing e.g. manual testing. Confident with building and maintaining frameworks in one or more of these languages: Java, JavaScript, Python, or C#. Have practical experience with open source tools such as: Cypress, Karate, PlayWright, Selenium or similar. Worked in an agile environment. Develop ...

leadership in QA/testing roles, with experience guiding teams and managing delivery in Agile environments (SCRUM, Kanban) Strong programming skills in Java, C#, JavaScript/TypeScript , or similar Deep expertise in test automation frameworks such as Selenium, Playwright, Cypress, or RestAssured Experience with integration testing, test strategy , and test ...

would like to hear from you. Basic Qualifications Minimum 7 years of relevant professional experience using a modern UI programming language (Javascript/TypeScript) Experience building modern UI products using React Proven ability to lead engineering teams and deliver complex products with multiple stakeholders Experience architecting, designing full stack apps ...

people within software teamWhile we advocate for using the right tech for the right task, we often leverage the following technologies: Python, TypeScript/JavaScript, React, Node, Flask, SQL, cloud infra, CI/CD).Exceptional time management to meet your responsibilities in a complex and largely autonomous work environment.Strong communication ...

Employee Privacy NoticeMust-havesDegree in Computer Science, Software Engineering, or a related disciplineSignificant experience delivering software solutions at Principal Engineer levelStrong expertise in TypeScript, JavaScript, and Angular or comparable modern front-end technologiesExperience building backend services using Node.js or similar technologiesProven experience designing and developing complex distributed systemsDeep understanding ...

lifecycle patterns. Experience developing agent-driven workflows using frameworks such as LangChain, Google ADK, or similar orchestration frameworks. Experience frontend fundamentals, including HTML, CSS, JavaScript, browser rendering, DOM APIs, and performance tuning. Experience with automated testing withPlaywright, performance testing, code reviews, and CI/CD practices. Experience building secure, scalable ...

Microsoft Dynamics 365 Customer Engagement (CRM) platform and core technologies.Extensive experience designing, configuring, and supporting Dynamics 365 solutions.Strong development experience using C#, .NET, JavaScript, and TypeScript within Dynamics 365 environments.Hands-on experience developing Plugins, Custom Workflow Activities, Custom APIs, and integrations.Strong understanding of Dataverse architecture, security models, and data management.Experience ...

impact to the security of the UK. About you You will have experience in many of the following: Programming in one or more of JavaScript, Java, .Net, Python Collaboratively designing and building Proof of Concept or Production systems Source controlling your code with Version Control Systems, for example Git, Mercurial ...

right tech for the right task, you can expect to work with the following technologies to ensure scalable, high-performance applications: Programming Languages: JavaScript/TypeScript, Java, C#Frameworks: Vue/Angular/React/Node/Next, Spring/Spring Boot, .NET/ASP.NETCloud platforms: AWS, GCP, Azure CI/ ...

impact to the security of the UK. About you You will have experience in many of the following: Programming in one or more of JavaScript, Java, .Net, Python Collaboratively designing and building Proof of Concept or Production systems Source controlling your code with Version Control Systems, for example Git, Mercurial ...

succeed together. Skills & Experience Strong experience building and deploying production applications across the full stack Proficiency in multiple languages, including Python and TypeScript/JavaScript (experience with Go or Java is a plus) Deep experience working with data—whether that's building data pipelines, designing analytics systems, or creating data ...

team. We succeed together.Skills & Experience Strong experience building and deploying production applications across the full stackProficiency in multiple languages, including Python and TypeScript/JavaScript (experience with Go or Java is a plus)Deep experience working with data—whether that's building data pipelines, designing analytics systems, or creating data ...

continuous improvement initiativesCore RequirementsProfessional experience in software development (typically 2+ years depending on seniority)Proficiency in one or more programming languages (e.g., Java, Python, JavaScript, C#, Go)Experience with modern development frameworks and toolsBusiness-level Japanese (JLPT N2-N1 or equivalent) and English proficiencyExperience working in a team-based development ...

delivery. What We're Looking For 5+ years' commercial software engineering experience. Strong experience developing applications using C#/.NET . Experience with React , JavaScript and TypeScript. Strong understanding of cloud-native application development on Microsoft Azure . Experience with Azure services such as: App Service, Azure Functions, Azure Kubernetes ...

efforts, introducing new ideas and technologies What You'll Bring Proven experience as a Full Stack Engineer or similar role Expertise in Node, React, JavaScript/TypeScript, HTML, CSS, and responsive design principles Strong understanding of Back End technologies and best practices Passion for writing clean, well-tested code Experience ...

application development (.NET Core, C#) or winforms/WPF (C#) development. Our client will provide you with training into: .NET 10.0, WPF, MVVM, Prism, JavaScript, React, Angular 21, Microservices, MongoDB, Vue.js, TypeScript, Azure, AWS, ASP.NET Core Web API, Entity Framework, Node.js, Elasticsearch, Agile, TDD, BDD, Scrum, Kanban and Azure SQL. ...

such as Sitecore, Optimizely, Umbraco, Alterian, Immediacy, Ektron, Kentico, Sitefinity or dotnetnuke. Our client can provide you with industry recognised training in: .NET 10.0, JavaScript, React, Angular 21, Microservices, MongoDB, Vue.js, TypeScript, Azure, AWS, ASP.NET Core Web API, Entity Framework, Node.js, Elasticsearch, Agile, TDD, BDD, Scrum, Kanban and MongoDB. This ...

ideally in Agile environmentsTesting smart contracts, transactions and wallet integrationsProficient in using test automation frameworks and tools such as:UI Testing: Selenium, Cypress/JavaScript/Typescript, AppiumAPI Testing: REST Assured, Postman, SoapUIBDD Tools: Cucumber, SerenityDatabase TestingSolid experience with CI/CD pipelines and tools (e.g., Jenkins, GitHub Actions)Familiarity ...

operational workflowsBuild RESTful APIs using Flask and FastAPI for internal services and cross team integrationsDevelop lightweight web based dashboards and interfaces using HTML, CSS, JavaScript and Jinja2Work with PostgreSQL, MySQL, MongoDB and Redis for application, configuration and testing dataBuild and maintain Docker and Docker Compose environments for application deployment ...

haves Degree in Computer Science, Software Engineering, or a related discipline Significant experience delivering software solutions at Principal Engineer level Strong expertise in TypeScript, JavaScript, and Angular or comparable modern front-end technologies Experience building backend services using Node.js or similar technologies Proven experience designing and developing complex distributed systems ...

haves Degree in Computer Science, Software Engineering, or a related discipline Significant experience delivering software solutions at Principal Engineer level Strong expertise in TypeScript, JavaScript, and Angular or comparable modern front-end technologies Experience building backend services using Node.js or similar technologies Proven experience designing and developing complex distributed systems ...

TeamCity, and Chef • Experience of messaging or transactional environment i.e. NServiceBus, Websphere MQ, MSMQ or RabbitMQ • Experience of web technologies including HTML, CSS, JavaScript, jQuery and web client frameworks such as Knockout.js or Angular • Experience of XML, JSON and related like schemas and XSLT transformations • Experience ...

code, backed by strong testing discipline (TDD, plus performance and security testing). Knowing when to keep a human in the loop. Advanced modern JavaScript/TypeScript, NodeJS and React. Web development principles (REST, SPA...). Microservice architecture, AWS and DevOps. Building LLM-powered features: tool-calling, retrieval-augmented generation ...

combination of the below: Ideally over 7 years commercial development experience with C#/.Net/.Net Core Front end coding ability with JavaScript, CSS, HTML and React A good understanding of SOLID principles, Event Driven Architecture (EDA) and Domain-Driven Design (DDD) Experience of RESTful API design Experience ...

technical development experience on the Salesforce platform, ideally within a consultancy or fast‐paced enterprise environment. Programming Core: Deep expertise in Apex and JavaScript (ES6+), with strong roots in Object‐Oriented Programming (such as Python, Java or C#) an advantage. Front‐End & UI: Extensive hands‐on experience building modern ...