126 to 150 of 700 ECMAScript Jobs in London

functional frontend code Contribute to API and broader system design & documentation Essential Qualifications: Strong understanding of UX principles and web design fundamentals Expert in Javascript, Typescript, HTML, and CSS Extensive experience with modern web frameworks and patterns (eg. React, Next.js, Tailwind) Experience with real-time and bi-directional communication protocols ...

/CD pipelines. Desirable/you will get into: - Experience working with teams in building web applications using React and/or JavaScript on the client-side. - Familiarity with containerization technologies such as Docker & IaC tools like AWS CloudFormation. If all the above sounds good to you & you'd like ...

related field 5+ years of experience in frontend/UI engineering, with a focus on performance and scale Deep expertise in React, TypeScript, and JavaScript Strong understanding of WebSocket integration, low-latency data streaming, and threading Experience troubleshooting data-heavy UIs and optimising load times Familiarity with tools like Redis ...

related field 5+ years of experience in frontend/UI engineering, with a focus on performance and scale Deep expertise in React, TypeScript, and JavaScript Strong understanding of WebSocket integration, low-latency data streaming, and threading Experience troubleshooting data-heavy UIs and optimising load times Familiarity with tools like Redis ...

design Conversational UX Chatbot and conversational interface design Multi-turn conversation flows and context management Error handling and recovery patterns Frontend Development HTML, CSS, JavaScript/TypeScript React, Vue, or Angular Component-based architecture and state management API integration and async data handling AWS & Integration Basic AWS services (S3, CloudFront ...

design Conversational UX Chatbot and conversational interface design Multi-turn conversation flows and context management Error handling and recovery patterns Frontend Development HTML, CSS, JavaScript/TypeScript React, Vue, or Angular Component-based architecture and state management API integration and async data handling AWS & Integration Basic AWS services (S3, CloudFront ...

/Insomnia Strong Git, Docker, Kafka, Kubernetes and Azure/AWS/GCloud Good understanding of Playwright, Selenium/Nodriver, Beautifulsoup Good React, Vite, Javascript, CSS, Tailwinds Good understanding of asynchronous request handling and RESTful APIs Good understanding of proxies, browser tracking, cookies and browser fingerprinting Experience with PostgreSQL, MySQL ...

framework (experience of Slim4 is beneficial) Solid commercial experience developing front-end applications using React . Proficiency in front-end fundamentals: HTML5, CSS3, JavaScript (ES6+). Experience working with relational databases (e.g., MySQL, PostgreSQL) and writing complex SQL queries. Proficient with version control systems, particularly Git. Experience building and consuming ...

Exposure to CEP engines (Esper) or other live stream aggregation technologies. Familiarity with authentication, authorization, and endpoint security. Experience with C#/HTML/JavaScript and AWS/Terraform/CI-CD pipelines. Why Join CMC Markets? Work on high-performance trading systems that have global impact. Collaborate with ...

want What You'll Bring Experience building and shipping full-stack features in ambiguous, fast-paced environments Solid skills in NodeJS, TypeScript/JavaScript, and React Experience with microservices (synchronous + asynchronous) Familiarity with cloud platforms like AWS, GCP or Azure Good understanding of databases and how to choose ...

want What You'll Bring Experience building and shipping full-stack features in ambiguous, fast-paced environments Solid skills in NodeJS, TypeScript/JavaScript, and React Experience with microservices (synchronous + asynchronous) Familiarity with cloud platforms like AWS, GCP or Azure Good understanding of databases and how to choose ...

database development, automation and reporting using Power BI and Excel including VBA. Expert in at least one programming language like C#, Python, Java including JavaScript along with any exposure to one or more of Azure DevOps (Pipelines, CI/CD) and GIT. Good understanding of Investment products. Tasks that ...

database development, automation and reporting using Power BI and Excel including VBA. Expert in at least one programming language like C#, Python, Java including JavaScript along with any exposure to one or more of Azure DevOps (Pipelines, CI/CD) and GIT. Good understanding of Investment products. Tasks that ...

Clearance or above required Practical Power BI experience (with interest/ability to grow Power Platform capability) Familiar with a development language (e.g. C#, JavaScript) and Azure basics Strong communication, problem-solving, and stakeholder engagement skills Ability to work under general guidance, organise your own workload, and collaborate effectively (aligned ...

have a good knowledge of AWS and Kubernetes You have a good understanding of CQRS and Event Driven systems The tech stack also includes JavaScript/TypeScript and React for client side applications; experience with any of these would be beneficial but you can pick them ...

have a good knowledge of AWS and Kubernetes You have a good understanding of CQRS and Event Driven systems The tech stack also includes JavaScript/TypeScript and React for client side applications; experience with any of these would be beneficial but you can pick them ...

Required Experience 2–5 years of professional software engineering experience, ideally working on backend systems, APIs, or AI-related products Proficiency in Python and JavaScript/TypeScript (Node.js) Strong understanding of backend architectures, REST/GraphQL APIs, and data modelling Experience with containerisation (Docker) and cloud platforms ...

Required Experience 2–5 years of professional software engineering experience, ideally working on backend systems, APIs, or AI-related products Proficiency in Python and JavaScript/TypeScript (Node.js) Strong understanding of backend architectures, REST/GraphQL APIs, and data modelling Experience with containerisation (Docker) and cloud platforms ...

long-term reliability What We're Looking ForRequired: · 2+ years software development experience · Commercial experience with Angular (v10+) · Strong proficiency in TypeScript and JavaScript · Familiar with RxJS and reactive programming concepts · Experience working with APIs (REST or GraphQL) · Some Node.js back-end experience (or willingness to grow in that area ...

long-term reliability What We're Looking ForRequired: · 2+ years software development experience · Commercial experience with Angular (v10+) · Strong proficiency in TypeScript and JavaScript · Familiar with RxJS and reactive programming concepts · Experience working with APIs (REST or GraphQL) · Some Node.js back-end experience (or willingness to grow in that area ...

performance testing tools like JMeter, Gatling, K6, Neoload, or Webload . Strong coding skills in at least one language such as Java, TypeScript JavaScript, Python, C#, , Scala, or PHP. Experience designing and building automation frameworks . Familiarity with Agile development environments (SCRUM, Kanban, TDD, BDD). Implementing pipelines using common ...

risk; brings up appropriately. Qualifications: Bachelor's degree preferred or equivalent experience Talents Needed for Success: 7+ years’ experience in full-stack development, including JavaScript; core Java development, Perl/Shell Scripting; automated unit testing for front-end and back-end development 3+ years’ experience with Oracle RDBMS, SQL Query ...

working with Python, C#, and Angular. Strong interpersonal, communication, and presentation skills applicable to a wide audience. Experience with PyTorch, Scikit-learn, Go, Databricks, JavaScript, and Azure Pipelines is desirable, but not essential. Experience in leading software engineering efforts for AI-enabled SaaS products is desirable, but not essential. ...

working with Python, C#, and Angular. Strong interpersonal, communication, and presentation skills applicable to a wide audience. Experience with PyTorch, Scikit-learn, Go, Databricks, JavaScript, and Azure Pipelines is desirable, but not essential. Experience in leading software engineering efforts for AI-enabled SaaS products is desirable, but not essential. ...

skills, with the ability to work effectively in collaborative teams. Exposure to agile delivery methods. Experience with other development languages or frameworks such as JavaScript, Java, Python, or .NET – or a strong willingness to learn and adapt to new technologies as required. Qualifications & Certifications Salesforce Platform Developer I – Required Salesforce ...