326 to 350 of 372 JavaScript Jobs in London

Security Architect (API/Product Security) Retail Hybrid: 3 days onsite per week in London 6 months+ £750 - £800 per day In short: We require a strong, application-focused Security Architect with a keen background ...

Most engineers build applications. This team builds the components those applications rely on. I’m hiring for a developer tools company building widely adopted JavaScript components used in data-intensive applications across global enterprises, financial institutions, and technology companies. This is core engineering work, focused on performance, scalability, and building … Building features end-to-end — from design through to release Shaping the direction of widely adopted developer tooling What they’re looking for Strong JavaScript and TypeScript fundamentals (framework-agnostic mindset) Experience with a statically typed language (C++, C#, Java, Python, etc.) Deep understanding of algorithms, data structures, and software ...

Front End React Developer, React, Javascript, NW London to £75K A leading financial software company are looking for a Front End JavaScript developer who is proficient with React.js. The role is Offcie based in North West London, Your primary focus will be on developing user interface components and implementing them … wireframes into high quality code Optimising components for maximum performance across a vast array of web-capable devices and browsers Skills Strong proficiency in JavaScript, including DOM manipulation and the JavaScript object model Experience developing with typescript Thorough understanding of React.js and its core principles Experience with Redux ...

practices in mobile development. Drive continuous improvement initiatives to enhance development processes and workflows. Required qualifications, capabilities and skills Formal training or certification on JavaScript concepts and proficient advanced experience Strong knowledge of JavaScript, TypeScript, and ES6+ syntax Ability to write testable, clean JavaScript code Familiarity with writing unit tests … Excellent written and verbal communication skills in English Preferred qualifications, capabilities and skills Proficiency in React framework Building applications using React Nativein TypeScript or JavaScript Native application development across Android/iOS in Kotlin/Swift Understanding of REST APIsand GraphQL Comfortable working with projects partially or fully using TypeScript ...

Looking to join a company when you can make a real impact? Do you have 3+ years commercial experience developing software with Java & JavaScript? 🚀 Full Stack Engineer – SaaS Solutions 🚀 💰 Salary – up to £55k + bonus 📍 Location – hybrid working 2 days a week in modern London office I am excited … Departments of Work & Pensions and International Trade. They are looking for a motivated Full Stack Engineer with experience with: Java Spring Boot Microservices JavaScript Frontend frameworks: they use Vue.js but are also open to React and Angular Containerisation using Docker, Kubernetes Developing cloud-native applications with AWS, GCP, Azure ...

optimal performance. Design and build integrations using REST/SOAP APIs and middleware (MuleSoft/Jitterbit). Utilise front-end skills (HTML, CSS, JavaScript) to deliver seamless Lightning user experiences. Lead scoping, discovery, and design workshops. Frame complex business problems clearly and present technical solutions confidently to C-suite stakeholders. … complex permission architectures. Proven background in managing data migrations and governing API/middleware integrations. Experience spanning across the following ecosystem pillars: HTML, CSS, JavaScript, able to build and review high-quality Lightning front-end experiences. REST/SOAP, platform events, MuleSoft/ETL tools, data migration strategy. Opportunity/ ...

Java Script Works is seeking a seasoned software engineer in Greater London. The ideal candidate will have at least 5 years of experience in QA and software engineering, along with proficiency in one or more ...

Head of Engineering - Java, Javascript, Cloud, Healthcare Up to £850 per day (Inside IR35) London/Hybrid (3 days onsite) 6 months My client is a high-profile organisation seeking a Head of Engineering to lead a team of Software Engineering Managers, driving the development and transformation of technology products. … This role requires deep technical expertise (Java, Javascript, Azure/GCP) and a proven ability to build high-performing engineering functions in fast-paced, complex environments. You will play a key role in a wider transformation programme, introducing modern engineering practices, improving architecture, and delivering scalable, consumer-facing digital products. ...

Senior Software Engineer London, United Kingdom Posted about 1 year ago Tech Stack Amazon AWS NoSQL TypeScript React Native React Node.js JavaScript Qualifications Backend and front‐end development experience Proficient in the JavaScript ecosystem Experience with Node.js Experience with React Experience with TypeScript Experience with React Native Bonus: Experience with ...

Senior Javascript Engineer (Node.js/AI) | Publishing 📍 London (Hybrid – min. 1 day per week) 💰 Up to £80,000 (pro rata) 📄 6-month Fixed Term Contract We’re partnering with a well-established publishing organisation undergoing a major digital and AI-led transformation . With a strong global presence, they ...

FRONT END DEVELOPER Salary up to £65-80k Hybrid working - 3 days per week on-site in Bromley Modern front-end stack - Vue.js, JavaScript, HTML, CSS Opportunity to shape user-facing products in a growing tech team ABOUT THE CLIENT We're working with a growing UK-based organisation … suit someone who enjoys ownership, problem-solving, and building clean, maintainable code. SENIOR FRONT END DEVELOPER ESSENTIAL SKILLS Strong commercial experience with Vue.js Solid JavaScript (ES6+) experience Strong HTML and CSS skills Experience building responsive and user-focused web applications Understanding of front-end performance and optimisation Experience working ...

We are seeking an experienced Senior SOAR Engineer to join the Cyber Security function of a leading investment bank. This is a key technical role within the Security Engineering team, where you will act as ...

Senior Software Engineer (In-Car Payments) London, United Kingdom Posted 11 months ago Tech Stack Payments React Go JavaScript PHP Python TypeScript Requirements Highly skilled and proficient coding in PHP, with strong skills in adjacent areas such as TypeScript, React, JavaScript, or Python. A desire and willingness to learn other ...

Core setup: Set up, manage, and optimise Google Analytics 4 (GA4) and Google Tag Manager (GTM) Advanced tracking: Implement solutions in GTM using custom JavaScript and troubleshoot using DevTools AI integration: Research and implement AI-powered tools (such as LLMs for code generation or automated auditing) to streamline tracking deployments … improvement Required Skills & Qualifications Proven experience in Google Analytics (GA4) and Google Tag Manager (GTM) Strong knowledge of tracking implementation & debugging tools Familiarity with JavaScript, Regex, and Data Layer management Experience with Google BigQuery, SQL, and data visualisation tools (e.g. LookerStudio) Proficiency in Microsoft Excel/Google Sheets (pivot tables ...

Scalers HQ are proud to be partnering with an innovative and fast growing Media organisation in London. We are looking for a Principal JavaScript Engineer/Team Lead to join their collaborative tech team. You'll play a key role in delivering cutting-edge AdTech analytics solutions, reporting directly … feature breakdown, technical planning, and release processes. Manage and mentor engineers along with growing a high-performing teams. Skills & Experience Required Extensive experience with JavaScript/TypeScript, React, Redux, and Node.js Strong experience in TDD and testing frameworks (Jest, Mocha, Cypres/Playright) A track record in modular system architecture ...

will: * Own and extend internal web applications used for robot data collection, review, QA, and dataset publishing* Build and maintain FastAPI backends, vanilla JavaScript frontends, CLI tooling, and supporting services* Improve recording workflows, state machines, config validation, batch processing, stale-data recovery, and archival processes* Containerise and orchestrate services … years* Strong production Python experience* Experience with typing, async/await, threading, multiprocessing, and concurrent workloads* FastAPI or another async Python web framework* Vanilla JavaScript, including DOM manipulation, fetch, and WebSockets* Experience building internal tooling, operator tooling, platform tooling, or workflow orchestration systems* Strong CLI tooling experience, including argparse ...

Java Script Works is seeking a Senior Software Engineer located in London, United Kingdom. The role involves contributing to the rebuild and refinement of our core platform and writing clean, scalable code using TypeScript, React ...

Java Script Works is looking for a Senior Software Engineer based in London, United Kingdom. The ideal candidate should have strong knowledge of ASP.NET Core and experience with frontend frameworks such as React and Vue.js. ...

ABOUT APPLY APPLY is the Agentic Customer Experience (ACx) partner for the world’s most ambitious consumer and entertainment brands. We bring together deep domain expertise across Retail, CPG, Sports, and Media with AI-native ...

Java Script Works is seeking a Senior Software Engineer for a contract role in London. The ideal candidate should demonstrate strong written and verbal communication skills and effectively collaborate across diverse functional teams. Experience with ...

A leading insurance provider in Greater London is seeking an experienced software engineer proficient in JAVA, .NET, and JavaScript. The role involves consulting with users, guiding teams, and developing innovative software solutions. Candidates must possess ...

30pm Finish on a Friday Northolt, London Are you a Full Stack Developer from a .NET and C# background, with an understanding of JavaScript and C++, looking for an autonomous position where you will be the go-to technical expert? Do you want a Hybrid role where … bringing a new system to market. This role would suit a Full Stack Developer from a .NET and C# background, with knowledge of JavaScript and C++, looking for an autonomous, hybrid role within the renewables sector. The Role: Maintaining and improving a .NET web app Offering first line support customers ...

Head of Software Engineering – NESTJS TypeScript, JavaScript, Node, NESTJS, GCP, Cloud Computing, Payments, Fintech. Claude-Code. London – Hybrid – 3 days a week onsite. Permanent Role. Harrington Starr has partnered up with a Global Financial Payments company who is looking to hire a Head of Development and join an Engineering Team … discipline What we’re looking for Senior leadership experience and hands‐on Development in Claude‐Code AI Engineers. Experience and hands‐on Development with JavaScript, TypeScript, NodeJS Expert experience with NESTJS Framework. Strong domain knowledge across Payments or Fintech Able to bridge technical execution with business and client requirements ...

code, and ensure successful adoption of an AI-native platform across insurer workflows. Key Responsibilities Write and maintain production and integration code in Python, JavaScript, and SQL as part of client implementations and internal tooling Lead end-to-end delivery of complex customer implementations, managing timelines, risks, and plans Configure … years of relevant experience; a formal CS degree is preferred but not essential for the right candidate Strong hands-on skills across SQL and JavaScript; Python experience is a plus Proven experience in customer-facing technical roles, with the ability to own discovery, scope deliverables, and manage client relationships Able ...

Java Script Works is seeking a Senior Product Engineer in London, United Kingdom, to work in an AWS cloud-native environment. In this full-time role, you will leverage your expertise in NodeJS, Typescript, and ...