ECMAScript Jobs in London

126 to 150 of 1,358 ECMAScript Jobs in London

Senior / Lead Shopify Developer

City of London, London, United Kingdom
Hybrid / WFH Options
Halian | Managed Services, Recruitment Agency & Contract Staffing
years specialising in Shopify/Shopify Plus in a senior or lead position. Deep understanding of Shopify’s Liquid templating language and theme architecture. Strong proficiency in HTML5, CSS3, JavaScript (ES6+), React/Vue , and modern front-end build tools (Webpack, Vite, etc.). Experience building custom Shopify apps using Node.js or Ruby on Rails . Familiarity with Headless/ More ❯
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Full Stack Engineer (Python and React)

City of London, London, United Kingdom
Hybrid / WFH Options
Harnham
grade applications. Strong backend skills in Python (FastAPI, Flask) with experience designing APIs and integrating databases (e.g. GraphDB, CosmosDB, SQL). Solid frontend development skills in React, TypeScript/JavaScript, HTML, and CSS . Experience developing scalable, cloud-based solutions — Azure preferred. Understanding of modern development best practices, including agile delivery, CI/CD, and automated testing. Passion for emerging More ❯
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Full Stack Engineer (Python and React)

London Area, United Kingdom
Hybrid / WFH Options
Harnham
grade applications. Strong backend skills in Python (FastAPI, Flask) with experience designing APIs and integrating databases (e.g. GraphDB, CosmosDB, SQL). Solid frontend development skills in React, TypeScript/JavaScript, HTML, and CSS . Experience developing scalable, cloud-based solutions — Azure preferred. Understanding of modern development best practices, including agile delivery, CI/CD, and automated testing. Passion for emerging More ❯
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Full Stack Engineer (Python and React)

london, south east england, united kingdom
Hybrid / WFH Options
Harnham
grade applications. Strong backend skills in Python (FastAPI, Flask) with experience designing APIs and integrating databases (e.g. GraphDB, CosmosDB, SQL). Solid frontend development skills in React, TypeScript/JavaScript, HTML, and CSS . Experience developing scalable, cloud-based solutions — Azure preferred. Understanding of modern development best practices, including agile delivery, CI/CD, and automated testing. Passion for emerging More ❯
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Full Stack Engineer (Python and React)

london (city of london), south east england, united kingdom
Hybrid / WFH Options
Harnham
grade applications. Strong backend skills in Python (FastAPI, Flask) with experience designing APIs and integrating databases (e.g. GraphDB, CosmosDB, SQL). Solid frontend development skills in React, TypeScript/JavaScript, HTML, and CSS . Experience developing scalable, cloud-based solutions — Azure preferred. Understanding of modern development best practices, including agile delivery, CI/CD, and automated testing. Passion for emerging More ❯
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Senior Software Engineer Hybrid /London Central

London, United Kingdom
Hybrid / WFH Options
Akkodis
with ownership of technical decisions and outcomes Experience designing and deploying scalable, observable, and maintainable systems Familiarity with microservices architecture (synchronous and asynchronous) Strong experience with NodeJS, TypeScript/JavaScript, and React Good understanding of cloud platforms (AWS, GCP, Azure) Solid grasp of database technologies and trade-offs Experience with automated testing and web security best practices Background in SaaS More ❯
Employment Type: Permanent
Salary: £80000 - £100000/annum
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Development/AI Manager

City of London, London, United Kingdom
McCabe & Barton
like Appian Workflow orchestration experience (Airflow, Prefect) Ability to build custom automation frameworks using Python or similar languages Full-Stack Development Solid software engineering background with proficiency in Python, JavaScript/TypeScript, Java, or Go Experience with modern frameworks (React, Node.js, Django, FastAPI) Knowledge of microservices architecture, API design (REST, GraphQL) Experience with containerization (Docker, Kubernetes) and cloud-native development More ❯
Employment Type: Permanent
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Senior Engineer

Greater London, England, United Kingdom
Hybrid / WFH Options
Solirius Reply
/8 to current Applied knowledge of front end frameworks (Angular, React, other similar) Spring framework or Jax-RS, Jax-WS, JPA Knowledge of selected front end technologies (HTML, JavaScript, CSS) Rest, Hibernate, Docker, Terraform, GitHub, Jenkins, development and deployment in a cloud environment SQL TDD/BDD Experience of working with cloud infrastructure (Azure or AWS, GCP is beneficial More ❯
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Senior Engineer

london, south east england, united kingdom
Hybrid / WFH Options
Solirius Reply
/8 to current Applied knowledge of front end frameworks (Angular, React, other similar) Spring framework or Jax-RS, Jax-WS, JPA Knowledge of selected front end technologies (HTML, JavaScript, CSS) Rest, Hibernate, Docker, Terraform, GitHub, Jenkins, development and deployment in a cloud environment SQL TDD/BDD Experience of working with cloud infrastructure (Azure or AWS, GCP is beneficial More ❯
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UI MSAL Developer

City of London, London, United Kingdom
Tata Consultancy Services
performance techniques. Be responsible for Unit, Integration Testing, and End-to-End testing. Working in Agile teams. Your Profile Essential skills/knowledge/experience: Strong experience in HTML, JavaScript, Typescript, CSS, SCSS, SCSS modules. Hands on experience in Git. Strong Skills in React, Next.js, Redux, React Context API, and State management. Good understanding of the Testing frameworks e.g., Jest More ❯
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UI MSAL Developer

London Area, United Kingdom
Tata Consultancy Services
performance techniques. Be responsible for Unit, Integration Testing, and End-to-End testing. Working in Agile teams. Your Profile Essential skills/knowledge/experience: Strong experience in HTML, JavaScript, Typescript, CSS, SCSS, SCSS modules. Hands on experience in Git. Strong Skills in React, Next.js, Redux, React Context API, and State management. Good understanding of the Testing frameworks e.g., Jest More ❯
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UI MSAL Developer

london, south east england, united kingdom
Tata Consultancy Services
performance techniques. Be responsible for Unit, Integration Testing, and End-to-End testing. Working in Agile teams. Your Profile Essential skills/knowledge/experience: Strong experience in HTML, JavaScript, Typescript, CSS, SCSS, SCSS modules. Hands on experience in Git. Strong Skills in React, Next.js, Redux, React Context API, and State management. Good understanding of the Testing frameworks e.g., Jest More ❯
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UI MSAL Developer

london (city of london), south east england, united kingdom
Tata Consultancy Services
performance techniques. Be responsible for Unit, Integration Testing, and End-to-End testing. Working in Agile teams. Your Profile Essential skills/knowledge/experience: Strong experience in HTML, JavaScript, Typescript, CSS, SCSS, SCSS modules. Hands on experience in Git. Strong Skills in React, Next.js, Redux, React Context API, and State management. Good understanding of the Testing frameworks e.g., Jest More ❯
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Senior Full Stack Engineer

London Area, United Kingdom
Xapien
observability, and automation alongside platform engineers. Your Skills & Experience: Must-haves to be successful in this role: Strong experience writing backend services in Go. Proficiency in React and modern JavaScript/TypeScript. Solid understanding of microservices architecture, RESTful APIs, and service-to-service communication. Experience working with cloud infrastructure (e.g. AWS, GCP or Azure). Strong grasp of software engineering More ❯
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Senior Full Stack Engineer

City of London, London, United Kingdom
Xapien
observability, and automation alongside platform engineers. Your Skills & Experience: Must-haves to be successful in this role: Strong experience writing backend services in Go. Proficiency in React and modern JavaScript/TypeScript. Solid understanding of microservices architecture, RESTful APIs, and service-to-service communication. Experience working with cloud infrastructure (e.g. AWS, GCP or Azure). Strong grasp of software engineering More ❯
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Senior Full Stack Engineer

london, south east england, united kingdom
Xapien
observability, and automation alongside platform engineers. Your Skills & Experience: Must-haves to be successful in this role: Strong experience writing backend services in Go. Proficiency in React and modern JavaScript/TypeScript. Solid understanding of microservices architecture, RESTful APIs, and service-to-service communication. Experience working with cloud infrastructure (e.g. AWS, GCP or Azure). Strong grasp of software engineering More ❯
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Senior Full Stack Engineer

london (city of london), south east england, united kingdom
Xapien
observability, and automation alongside platform engineers. Your Skills & Experience: Must-haves to be successful in this role: Strong experience writing backend services in Go. Proficiency in React and modern JavaScript/TypeScript. Solid understanding of microservices architecture, RESTful APIs, and service-to-service communication. Experience working with cloud infrastructure (e.g. AWS, GCP or Azure). Strong grasp of software engineering More ❯
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Full Stack Software Engineer (Golang/Typescript)

City of London, London, United Kingdom
Safe Intelligence
e.g., Optimistic Concurrency Control - OCC) and schema design, domain-driven architecture, and concurrency. Proven experience developing production-grade RESTful APIs ideally with an API-first approach. Some proficiency in JavaScript/TypeScript-based frontend development, with extensive expertise in React. This includes a deep understanding of the DOM, component design, CSS, and state management. Familiarity with Kubernetes-specific platform components More ❯
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Full Stack Software Engineer (Golang/Typescript)

London Area, United Kingdom
Safe Intelligence
e.g., Optimistic Concurrency Control - OCC) and schema design, domain-driven architecture, and concurrency. Proven experience developing production-grade RESTful APIs ideally with an API-first approach. Some proficiency in JavaScript/TypeScript-based frontend development, with extensive expertise in React. This includes a deep understanding of the DOM, component design, CSS, and state management. Familiarity with Kubernetes-specific platform components More ❯
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Full Stack Software Engineer (Golang/Typescript)

london, south east england, united kingdom
Safe Intelligence
e.g., Optimistic Concurrency Control - OCC) and schema design, domain-driven architecture, and concurrency. Proven experience developing production-grade RESTful APIs ideally with an API-first approach. Some proficiency in JavaScript/TypeScript-based frontend development, with extensive expertise in React. This includes a deep understanding of the DOM, component design, CSS, and state management. Familiarity with Kubernetes-specific platform components More ❯
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Full Stack Software Engineer (Golang/Typescript)

london (city of london), south east england, united kingdom
Safe Intelligence
e.g., Optimistic Concurrency Control - OCC) and schema design, domain-driven architecture, and concurrency. Proven experience developing production-grade RESTful APIs ideally with an API-first approach. Some proficiency in JavaScript/TypeScript-based frontend development, with extensive expertise in React. This includes a deep understanding of the DOM, component design, CSS, and state management. Familiarity with Kubernetes-specific platform components More ❯
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Software Engineering Manager - Unified Client Experience (UCX)

City of London, London, United Kingdom
Hybrid / WFH Options
Hargreaves Lansdown
Thrives in fast-paced, regulated environments where speed, compliance, and innovation go hand-in-hand. Your Technical Toolkit React/React Native/TypeScript Swift (iOS)/Kotlin (Android) JavaScript/HTML/CSS Figma/Git Testing frameworks : Jest, Cypress, XCTest, Espresso CI/CD pipelines : GitHub Actions, CircleCI, Bitrise Cloud-native architecture : AWS, Docker, Kubernetes Observability tools Interview More ❯
Employment Type: Permanent, Work From Home
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Principal Software Engineer - Unified Client Experience (UCX)

City of London, London, United Kingdom
Hybrid / WFH Options
Hargreaves Lansdown
help engineers thrive. Energised by fast paced, regulated environments where we ship at speed, embrace change, and never stop evolving. Your Technical Toolkit React/React Native/TypeScript JavaScript/iOS (Swift) or Android (Kotlin) RDBMS (Oracle/Sybase)/NoSQL databases (Document DB) AWS and cloud-native microservices containerised architecture (e.g. K8s, Docker) Modern software engineering practices with More ❯
Employment Type: Permanent, Work From Home
Salary: £10,000
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React JS Developer - Java

London, United Kingdom
Hybrid / WFH Options
and looking for the most talented Software Engineers to join them. 50-70k (depending on experience) Fully remote Benefits package Over 4 years experience working with Java, React, Javascript, Python Experience using Cloud-based architecture, AWS or Azure DevOps Automated Tools, Jenkins, Docker, OpenShift or Kubernetes Experience using SQL, MongoDB or Elasticsearch Experience using Testing technologies, Cypress, Selenium or More ❯
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Full Stack Developer

EC2A, Finsbury Square, Greater London, United Kingdom
Hybrid / WFH Options
Career Concept
technical design, responsible for delivering quality driven and well documented code. Skills required: 5+ years experience as a Software Engineer/Developer Confident building REST API services using Node.js, Javascript or Typescript React.js or similar (Vue/Angular) experience with SSR such as Next.js an advantage SQL and NoSQL Ideally experience with Serverless. Ideally experience with AWS or AZURE/ More ❯
Employment Type: Permanent
Salary: £70000 - £75000/annum
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