ECMAScript Jobs in London

326 to 350 of 1,343 ECMAScript Jobs in London

Software Engineer

london, south east england, united kingdom
Scalian
Proficient in C++11 or later, with a strong understanding of memory management, concurrency, and object-oriented design . Hands-on experience with AngularJS and front-end development ( HTML, CSS, JavaScript ). Familiarity with REST APIs , JSON , and web service integration . Experience working in software maintenance/support roles with bug fixing and system enhancements. Strong debugging and problem-solving More ❯
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Software Engineer

london (hounslow), south east england, united kingdom
Scalian
Proficient in C++11 or later, with a strong understanding of memory management, concurrency, and object-oriented design . Hands-on experience with AngularJS and front-end development ( HTML, CSS, JavaScript ). Familiarity with REST APIs , JSON , and web service integration . Experience working in software maintenance/support roles with bug fixing and system enhancements. Strong debugging and problem-solving More ❯
Posted:

Lead Java Developer

Greater London, England, United Kingdom
CMC Markets
functional teams. Desirable Experience: 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 a team of passionate technologists More ❯
Posted:

Lead Java Developer

london, south east england, united kingdom
CMC Markets
functional teams. Desirable Experience: 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 a team of passionate technologists More ❯
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Microsoft Dynamics 365 CE Solution Architect

London, United Kingdom
Hybrid / WFH Options
Cognizant
experience through SQL Server Reporting Services (SSRS) and FetchXML .NET Framework Version 4.5 or above including strong WCF\ Web API experience Knowledge of Web development, HTML, CSS, JSON, XML, Javascript and SQL C# and OOPS concepts Good to have experience and knowledge of Microsoft Azure Power Apps and Portal Field Services Customer Insight What education and certification credentials are needed More ❯
Employment Type: Permanent, Work From Home
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Full Stack Engineer (AI)

London Area, United Kingdom
Hybrid / WFH Options
Euphoric
ML methods (e.g. agents/LLMs, recommender systems, reinforcement learning) to enhance user experience in a meaningful business domain. Contribute across the tech stack: You’ll work in React (JavaScript/TypeScript) on the frontend and Python (FastAPI, SQLAlchemy) on the backend, shipping production-ready code and user-facing features in addition to innovative ML work. Live on the cutting More ❯
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Full Stack Engineer (AI)

City of London, London, United Kingdom
Hybrid / WFH Options
Euphoric
ML methods (e.g. agents/LLMs, recommender systems, reinforcement learning) to enhance user experience in a meaningful business domain. Contribute across the tech stack: You’ll work in React (JavaScript/TypeScript) on the frontend and Python (FastAPI, SQLAlchemy) on the backend, shipping production-ready code and user-facing features in addition to innovative ML work. Live on the cutting More ❯
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Workday Test Lead

Wembley, London, United Kingdom
Hybrid / WFH Options
Football Association Limited
Understanding of DevOps testing practices and CI/CD integration. Desirable skills: Workday certifications (e.g. HCM, Payroll or Integration). Experience with automation tools such as Playwright (TypeScript/JavaScript) or Cypress. Familiarity with cloud platforms such as Azure DevOps or AWS. Knowledge of version control systems such as Git or GitHub. What's in it for you? We are More ❯
Employment Type: Permanent, Work From Home
Posted:

Senior Software Development Engineer (Python/Javascript/React)

London Area, United Kingdom
Clearwater Analytics (CWAN)
Job Summary: The Trading and Risk Management System (TRMS) team is responsible for developing, supporting and maintaining our front and back office trading web applications using Python, the proprietary Beacon Dependency Graph and Glint, the Beacon UI framework. The successful More ❯
Posted:

Senior Software Development Engineer (Python/Javascript/React)

City of London, London, United Kingdom
Clearwater Analytics (CWAN)
Job Summary: The Trading and Risk Management System (TRMS) team is responsible for developing, supporting and maintaining our front and back office trading web applications using Python, the proprietary Beacon Dependency Graph and Glint, the Beacon UI framework. The successful More ❯
Posted:

Senior Software Development Engineer (Python/Javascript/React)

london, south east england, united kingdom
Clearwater Analytics (CWAN)
Job Summary: The Trading and Risk Management System (TRMS) team is responsible for developing, supporting and maintaining our front and back office trading web applications using Python, the proprietary Beacon Dependency Graph and Glint, the Beacon UI framework. The successful More ❯
Posted:

Senior Software Development Engineer (Python/Javascript/React)

london (city of london), south east england, united kingdom
Clearwater Analytics (CWAN)
Job Summary: The Trading and Risk Management System (TRMS) team is responsible for developing, supporting and maintaining our front and back office trading web applications using Python, the proprietary Beacon Dependency Graph and Glint, the Beacon UI framework. The successful More ❯
Posted:

Frontend Developer - EdTech - Fully Remote - 70k-90k

London, United Kingdom
Hybrid / WFH Options
Opus Recruitment Solutions
working with modern web technologies to join my clients team who are in the EdTech space! Core Skills: Vue.js & Nuxt 4 (Vite, Composition API, Pinia, Nuxt Plugins) TypeScript/JavaScript (ES6) - clean, maintainable, typesafe code RESTful API integration Responsive UI using HTML, TailwindCSS, and CSS3 Bonus if you've worked with: NuxtUI Framework Frontend security (COOP/COEP, CORS, CSP More ❯
Employment Type: Permanent
Salary: GBP 70,000 - 90,000 Annual
Posted:

Frontend Developer - EdTech - Fully Remote - 70k-90k

East London, London, United Kingdom
Hybrid / WFH Options
Opus Recruitment Solutions
working with modern web technologies to join my clients team who are in the EdTech space! Core Skills: Vue.js & Nuxt 4 (Vite, Composition API, Pinia, Nuxt Plugins) TypeScript/JavaScript (ES6) – clean, maintainable, typesafe code RESTful API integration Responsive UI using HTML, TailwindCSS, and CSS3 Bonus if you’ve worked with: NuxtUI Framework Frontend security (COOP/COEP, CORS, CSP More ❯
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Frontend Developer - EdTech - Fully Remote - 70k-90k

City of London, London, United Kingdom
Hybrid / WFH Options
Opus Recruitment Solutions
working with modern web technologies to join my clients team who are in the EdTech space! Core Skills: Vue.js & Nuxt 4 (Vite, Composition API, Pinia, Nuxt Plugins) TypeScript/JavaScript (ES6) – clean, maintainable, typesafe code RESTful API integration Responsive UI using HTML, TailwindCSS, and CSS3 Bonus if you’ve worked with: NuxtUI Framework Frontend security (COOP/COEP, CORS, CSP More ❯
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Frontend Developer - EdTech - Fully Remote - 70k-90k

Central London / West End, London, United Kingdom
Hybrid / WFH Options
Opus Recruitment Solutions
working with modern web technologies to join my clients team who are in the EdTech space! Core Skills: Vue.js & Nuxt 4 (Vite, Composition API, Pinia, Nuxt Plugins) TypeScript/JavaScript (ES6) – clean, maintainable, typesafe code RESTful API integration Responsive UI using HTML, TailwindCSS, and CSS3 Bonus if you’ve worked with: NuxtUI Framework Frontend security (COOP/COEP, CORS, CSP More ❯
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DV Cleared Software Engineer

Central London, London, United Kingdom
Fortice Ltd
happy to work "high-side", on-site 3-5 days/week? And... do you have experience with a few of the following technologies?: Java Kotlin Python Kubernetes AWS JavaScript React Node.js Nodding along so far? We should chat. Fortice work with 18 compass-point supplier, whether you want to sit in a prime seat, join a well-known SME More ❯
Employment Type: Permanent
Salary: £95,000
Posted:

Senior Application Support Engineer

London Area, United Kingdom
Explore Group
time systems (finance/trading a plus) Strong Linux and command-line skills Knowledge of market data, order flows, and related protocols Ability to read and troubleshoot code (C++, JavaScript, Kotlin) SQL proficiency and familiarity with Git/CI-CD Experience with AWS, Prometheus, Grafana, RabbitMQ Tech Stack Backend: Kotlin, Node.js, TypeScript, RabbitMQ Cloud: AWS Databases: MySQL Monitoring: Prometheus, Grafana More ❯
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Senior Application Support Engineer

City of London, London, United Kingdom
Explore Group
time systems (finance/trading a plus) Strong Linux and command-line skills Knowledge of market data, order flows, and related protocols Ability to read and troubleshoot code (C++, JavaScript, Kotlin) SQL proficiency and familiarity with Git/CI-CD Experience with AWS, Prometheus, Grafana, RabbitMQ Tech Stack Backend: Kotlin, Node.js, TypeScript, RabbitMQ Cloud: AWS Databases: MySQL Monitoring: Prometheus, Grafana More ❯
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Senior Application Support Engineer

london, south east england, united kingdom
Explore Group
time systems (finance/trading a plus) Strong Linux and command-line skills Knowledge of market data, order flows, and related protocols Ability to read and troubleshoot code (C++, JavaScript, Kotlin) SQL proficiency and familiarity with Git/CI-CD Experience with AWS, Prometheus, Grafana, RabbitMQ Tech Stack Backend: Kotlin, Node.js, TypeScript, RabbitMQ Cloud: AWS Databases: MySQL Monitoring: Prometheus, Grafana More ❯
Posted:

Senior Application Support Engineer

london (city of london), south east england, united kingdom
Explore Group
time systems (finance/trading a plus) Strong Linux and command-line skills Knowledge of market data, order flows, and related protocols Ability to read and troubleshoot code (C++, JavaScript, Kotlin) SQL proficiency and familiarity with Git/CI-CD Experience with AWS, Prometheus, Grafana, RabbitMQ Tech Stack Backend: Kotlin, Node.js, TypeScript, RabbitMQ Cloud: AWS Databases: MySQL Monitoring: Prometheus, Grafana More ❯
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BackEnd Technical Support Developer

london, south east england, united kingdom
Hybrid / WFH Options
rmg digital
the clients needs, the companys platform features and technologies from the ground up. Experience needed as a Back End Developer: 3+ years of Node.js development Type Script/Strong JavaScript skills React REST API development SQL Git More ❯
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BackEnd Technical Support Developer

London Area, United Kingdom
Hybrid / WFH Options
rmg digital
s needs, the company’s platform features and technologies from the ground up. Experience needed as a Back End Developer: 3+ years of Node.js development Type Script/Strong JavaScript skills React REST API development SQL Git More ❯
Posted:

BackEnd Technical Support Developer

City of London, London, United Kingdom
Hybrid / WFH Options
rmg digital
s needs, the company’s platform features and technologies from the ground up. Experience needed as a Back End Developer: 3+ years of Node.js development Type Script/Strong JavaScript skills React REST API development SQL Git More ❯
Posted:

BackEnd Technical Support Developer

london (city of london), south east england, united kingdom
Hybrid / WFH Options
rmg digital
the clients needs, the companys platform features and technologies from the ground up. Experience needed as a Back End Developer: 3+ years of Node.js development Type Script/Strong JavaScript skills React REST API development SQL Git More ❯
Posted: