1 to 25 of 902 Permanent JavaScript Jobs in London

team. Essential Skills & Experience Experience developing full stack applications using modern front-end and back-end technologies. Strong programming skills in languages such as JavaScript/TypeScript, Java, C#, Python, or Node.js. Experience with front-end frameworks such as React, Angular, or Vue.js. Experience building and consuming RESTful APIs ...

successful changes, service improvements and platform stability. Essential Skills & Experience Demonstrable experience in software development using C# and .NET. Working knowledge of HTML, CSS, JavaScript or TypeScript, with exposure to a modern front-end framework such as Vue or React. Understanding of APIs and experience consuming or building RESTful services. ...

Experience with FastAPI , Flask , or Django REST API and Microservices development Object-Oriented Programming (OOP) SQL and database design Frontend Strong knowledge of React.js JavaScript (ES6+), TypeScript HTML5, CSS3 Redux, React Hooks Responsive UI development Databases PostgreSQL, MySQL, SQL Server MongoDB (preferred) Cloud & DevOps AWS, Azure, or GCP Docker ...

maintainable production code in Python and TypeScript. Proven experience building complex user interfaces and software integrations using React or similar technologies. Strong knowledge of JavaScript, HTML and CSS. A good understanding of programming concepts, data structures, algorithms and HTML DOM components. Experience working with browser and web APIs, including HTML ...

years of professional software engineering experienceStrong experience developing enterprise applications using Java 11+ and related technologiesExtensive experience building modern web applications with React, TypeScript, JavaScript, HTML, and CSSExperience designing, building, and consuming RESTful APIs and distributed servicesStrong understanding of software engineering fundamentals, including data structures, design patterns, and system design ...

e.g., PostgreSQL, MySQL) and NoSQL databases (e.g., MongoDB) for data management and optimization. Experience with ETLs and data transformation Solid expertise in HTML, CSS, JavaScript, and ReactJS. Extensive experience with cloud platforms such as AWS including services for database hosting, API management, and serverless computing. Proficiency with Docker for containerization ...

NoSQL (MongoDB, Cassandra) and performance tuning.Familiarity with messaging systems (Kafka, RabbitMQ) and asynchronous architectures.Strong programming experience in one or more languages (Java, C#, Python, JavaScript/TypeScript, Go) and build tools (Maven, Gradle).Experience implementing test automation strategies, TDD/BDD practices and load testing (JMeter).Practical knowledge of DevOps ...

application stack.Strong back-end development experience, ideally using Java, Spring and Spring Boot.A good understanding of modern front-end engineering using technologies such as JavaScript, TypeScript, React or Angular.Experience designing and integrating RESTful APIs and distributed systems.Strong knowledge of software architecture principles, object-oriented design, design patterns and microservices.Experience working ...

enhancements • Working collaboratively across teams to deliver digital projects and continuous improvements Essential: • Strong commercial experience in software development • Highly proficient in Python, Django, JavaScript, HTML and CSS • Experience with database design and SQL • Strong knowledge of Git and collaborative development workflows • Experience developing with React and/or React ...

enhancements • Working collaboratively across teams to deliver digital projects and continuous improvementsEssential: • Strong commercial experience in software development • Highly proficient in Python, Django, JavaScript, HTML and CSS • Experience with database design and SQL • Strong knowledge of Git and collaborative development workflows • Experience developing with React and/or React Native ...

using Java, J2EE and Web Services.Strong understanding of REST APIs, Spring Boot, Micro Services and SOA web services.Expertise with front-end technologies such as JavaScript, TypeScript, Angular, and/or ReactJS.Proficiency in SQL, including query writing, stored procedures, and basic data modeling.Strong experience with modern testing frameworks, including unit ...

Experience Strong software engineering skills across front-end, back-end and data-driven product development. Strong experience developing modern web interfaces using React, TypeScript, JavaScript, HTML and CSS. Experience using component libraries and design systems such as Material UI to build consistent and accessible user interfaces. Experience building back ...

designing and developing solutions utilising most of the following technologies:• Strong front end web development experience with Angular or React (we use Angular), Typescript, JavaScript, HTML/CSS with an eye for good UX• Experience in designing and building distributed systems using Microsoft C#, .NET Core and Web API• Experience ...

TypeScript, leveraging frameworks such as **Next.js** or **Vite**.* **GenAI Frameworks**: Familiarity with tools like **LangChain**, **LangGraph**, **CrewAI**, or **Vercel AI** (in Python or JavaScript).* **LLM experience**: Practical experience with **Large Language Models** (LLMs) such as **OpenAI**, **Anthropic**, **Mistral**, or **Llama**, and tools like **Ollama**.* **Cloud Platforms**: Proficiency ...

ability to collaborate effectively across teams while supporting technical delivery.Technical Expertise• Strong proficiency in front-end technologies: React/Angular/Vue, HTML5, CSS3, JavaScript/TypeScript• Solid experience in back-end technologies: Node.js/.NET/Java/Python, REST APIs, GraphQL• Strong understanding of databases: SQL (PostgreSQL, MySQL ...

tools (e.g. Jenkins, GitHub Actions, Azure DevOps) Experience working in a regulated industry (e.g. financial services, insurance, healthcare) Familiarity with front-end basics (JavaScript, HTML/CSS) for full-stack contributions Knowledge of software security best practices Along with our client, we are committed to a diverse workforce ...

development using frameworks such as FastAPI, Flask, or Django; Experience designing and developing RESTful APIs; Good understanding of front-end development with React JS, JavaScript (ES6+), and TypeScript; intermediate knowledge is sufficient; Familiarity with state management using Redux or Context API and experience integrating REST APIs into front-end applications ...

experience you'll bring:Extensive experience as a Senior QE SDET Engineer or Senior DeveloperHas breadth of experience across different tech-stacks, such as JavaScript/TypeScript, Java, C#, or Python, amongst othersExperienced in RAG Weaviate, OpenAI, Agents, MCP, Langchain, Prompt Engineering, Browser-Use, and DjangoExperienced building AI Tools, Agents ...

Experience building production software applications. Strong understanding of software architecture and software engineering principles. Experience with one or more modern technology stacks such as: JavaScript/TypeScript React/Next.js Node.js PHP/Laravel .NET Java Good understanding of APIs and system integrations. Experience working with relational databases such ...

/equivalentProven years of experience in software development working with the following:C# preferred;SQL databases (e.g. SQL Server);Front-end technologies (HTML5, CSS, JavaScript frameworks – Angular preferred);Cloud services (Azure preferred);Experience with GenAI development tools such as Co-Pilot,Experience developing multi-layered products as a full stack ...

development experience building enterprise web applications and services, ideally including payroll, compensation, equity, HR, finance, or tax domains. Strong experience designing and building large JavaScript applications with Next.js and/or React (TypeScript, state management, performance optimization). Strong backend development experience in C# and .NET (ASP.NET, WebAPI, MVC) including ...

like JFrog, Nexus, etc.Good understanding on Containerisation solutions, e.g., K8, Docker, Kaniko, etc.Proficiency in at least one of the standard programming languages – Java/JavaScript, C#, Python, or similar Object-oriented programmingProficiency in at least one of the standard scripting languages – Terraform, Bash, Ansible, etc.Good understanding of Software engineering concepts ...

experience Commercial cloud experience with AWS, Azure or GCP Strong automated testing experience, including Jest/Mocha and ideally Cypress, BrowserStack or similar Excellent JavaScript fundamentals Strong communication and problem-solving skills Experience with TypeScript, SaaS/startups, generative AI APIs, creative technology, Unix/Linux or Bash ...

customers to build high-quality solutions using Angular and .NET technologies. Key Skills Required Strong commercial experience with Angular Good knowledge of TypeScript, JavaScript, HTML and CSS Experience integrating with REST APIs Solid .NET/ASP.NET Core experience Experience with automated testing tools such as Playwright, Vitest, Cypress or Jest ...

following: Dynamics 365 CE/CRM development Plugins, workflows and custom APIs Dynamics 365 configuration and customisation C# .NET Framework/.NET Core JavaScript, TypeScript, HTML and CSS Web APIs and integration services Azure Functions Azure Logic Apps Azure Service Bus Azure API Management Azure DevOps Git source control REST ...