376 to 400 of 422 ECMAScript Jobs in London

ownership of and will see the business impact of. There's a focus on backend and API development although you'll also have elements of front end work with JavaScript and React.js. Location: You'll be based in plush City office on a fulltime basis, Monday to Friday. About you: You have expertise with C# .Net, ASP.Net development You have … a strong knowledge of databases (SQL or Oracle) You're comfortable with JavaScript/React You have a thorough knowledge of Computer Science fundamentals such as OOP, Design Patterns, Data Structures, Algorithms You are collaborative with excellent communication and stakeholder management skills You are degree educated in Computer Science or similar technical discipline What's in it for you: As More ❯

on innovative predictive models to forecast sporting event outcomes. Key Responsibilities: Develop and maintain predictive models using strong mathematical and statistical knowledge Work with C#/.NET backend and JavaScript front-end frameworks such as React Apply network programming expertise (TCP/UDP) and Windows technologies Collaborate in a high-autonomy, cross-functional environment What We're Looking For: 5+ … years professional experience in software development, ideally with a quantitative or mathematical background Proficiency in C#, .NET, and modern JavaScript frameworks (React preferred) Experience with distributed version control systems (Git, PlasticSCM, Mercurial, etc.) Strong problem-solving skills with the ability to master complex concepts Good tenure in previous roles and a professional work ethic (non-smokers preferred) Interest in sports More ❯

join their fast-moving team. You’ll work closely with designers and engineers to build beautiful, responsive user interfaces across mobile and web, using React, React Native, and modern JavaScript frameworks. This is a great opportunity for someone who enjoys innovation, ownership, and building visually engaging products. You'll be joining a collaborative, design-focused team solving some of the … end technologies and contributing ideas to improve development Pair programming, code reviewing, and pushing to GitHub in a supportive engineering culture What Experience You Will Have Strong experience with JavaScript, HTML5, CSS3 and modern web development practices Hands-on ReactJS and React Native skills (including Redux) Experience with Git, GitHub, and version control workflows Understanding of UI design principles and More ❯

join their fast-moving team. You’ll work closely with designers and engineers to build beautiful, responsive user interfaces across mobile and web, using React, React Native, and modern JavaScript frameworks. This is a great opportunity for someone who enjoys innovation, ownership, and building visually engaging products. You'll be joining a collaborative, design-focused team solving some of the … end technologies and contributing ideas to improve development Pair programming, code reviewing, and pushing to GitHub in a supportive engineering culture What Experience You Will Have Strong experience with JavaScript, HTML5, CSS3 and modern web development practices Hands-on ReactJS and React Native skills (including Redux) Experience with Git, GitHub, and version control workflows Understanding of UI design principles and More ❯

A 1st or 2.1 postgraduate degree in computer science from a world-leading university and A* and A grades at A-level (or equivalent) Excellent coding skills in Java, JavaScript and/or TypeScript (above and beyond the university module/practical level) Some experience of working with large existing codebases Practical experience of working in commercial software development environments … join this successful company as they grow their business. Based in central London, there is scope for some hybrid working once you are established in the role. Keywords: Java, JavaScript, TypeScript, UI, UX, AWS, MongoDB, London Another top job from ECM, the high-tech recruitment experts. Even if this job's not quite right, do contact us now - we may More ❯

setting standards and fostering a culture of continuous improvement across the mobile development team. What You'll Do: Lead the development of mobile applications using React Native and modern JavaScript (ES6+). Drive technical design and implementation of new features, ensuring code quality and maintainability. Promote modern architectural patterns, such as modular design and state management best practices (e.g., Redux … technical decisions. What We're Looking For: 5-8 years of experience in front-end or mobile development, with a strong focus on React Native . Deep understanding of JavaScript/TypeScript , mobile performance optimization, and component-based architecture. Solid knowledge of mobile development workflows, debugging, testing (Jest, Detox), and CI/CD. Experience integrating RESTful APIs and third-party More ❯

Power Platform Developer Remote (UK-based) Were proud to be working exclusively with a forward-thinking education and training organisation at the heart of social impact and lifelong learning. As they expand their digital transformation journey, were now helping them More ❯

JavaScript Developer Location: 3 days per wk from home/2 days in London Salary: Circa 65k 80k + Benefits JavaScript Developer required by required by fast-growing, revolutionary tech company! This is a varied, challenging role in a talented team where youll be responsible for developing scalable backend services that bring their AI vision to life. You dont need More ❯

JavaScript Developer Location: 3 days per wk from home/2 days in London Salary: Circa 65k – 80k + Benefits JavaScript Developer required by required by fast-growing, revolutionary tech company! This is a varied, challenging role in a talented team where you’ll be responsible for developing scalable backend services that bring their AI vision to life. You don More ❯

Front End React Developer, React, Javascript, NW London to £80K 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 following well-known React.js workflows, specifically Redux and RTK. You … future use Translating designs and 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 and RTK (RTKQuery also a bonus) Familiarity More ❯

re looking for someone with: UI development or support experience Exposure to at least two of: ReactJS, GraphQL, AngularJS, AJAX, CSS, Mobile app development Ability to read/debug JavaScript and use browser developer tools Scripting with JavaScript, Python, Bash or Shell Understanding of MySQL or Oracle Strong communication skills and a solutions-driven mindset Nice to have: Experience supporting More ❯

re looking for someone with: UI development or support experience Exposure to at least two of: ReactJS, GraphQL, AngularJS, AJAX, CSS, Mobile app development Ability to read/debug JavaScript and use browser developer tools Scripting with JavaScript, Python, Bash or Shell Understanding of MySQL or Oracle Strong communication skills and a solutions-driven mindset Nice to have: Experience supporting More ❯

complex projects with minimal assistance. You architect high quality web applications, and design key tools and systems that support said web applications. Top Responsibilities: Write and review code in JavaScript or TypeScript,Golang,SQL Test, debug, maintain and/or update full-stack web applications. Write and review technical documents, including design, development, and revision documents. Collaborate with Product, UX … QA, and engineering teams, to deliver new features Mandatory Skills/Qualifications: 3+ years experience writing JavaScript or TypeScript, Golang,SQL 3+ years experience developing resource oriented APIs 3+ years experience designing and debugging databases Experience in multiple general purpose programming languages and building large, scaled full stack web solutions. Microservice design and implementation More ❯

complex projects with minimal assistance. You architect high quality web applications, and design key tools and systems that support said web applications. Top Responsibilities: Write and review code in JavaScript or TypeScript,Golang,SQL Test, debug, maintain and/or update full-stack web applications. Write and review technical documents, including design, development, and revision documents. Collaborate with Product, UX … QA, and engineering teams, to deliver new features Mandatory Skills/Qualifications: 3+ years experience writing JavaScript or TypeScript, Golang,SQL 3+ years experience developing resource oriented APIs 3+ years experience designing and debugging databases Experience in multiple general purpose programming languages and building large, scaled full stack web solutions. Microservice design and implementation More ❯

complex projects with minimal assistance. You architect high quality web applications, and design key tools and systems that support said web applications. Top Responsibilities: Write and review code in JavaScript or TypeScript,Golang,SQL Test, debug, maintain and/or update full-stack web applications. Write and review technical documents, including design, development, and revision documents. Collaborate with Product, UX … QA, and engineering teams, to deliver new features Mandatory Skills/Qualifications: 3+ years experience writing JavaScript or TypeScript, Golang,SQL 3+ years experience developing resource oriented APIs 3+ years experience designing and debugging databases Experience in multiple general purpose programming languages and building large, scaled full stack web solutions. Microservice design and implementation More ❯

complex projects with minimal assistance. You architect high quality web applications, and design key tools and systems that support said web applications. Top Responsibilities: Write and review code in JavaScript or TypeScript, Java, Kotlin, Golang, and/or SQL Test, debug, maintain and/or update full-stack web applications. Write and review technical documents, including design, development, and revision … documents. Collaborate with Product, UX, QA, and engineering teams, to deliver new features Mandatory Skills/Qualifications: 3+ years experience writing JavaScript or TypeScript, Java, Kotlin, Golang, and/or SQL 3+ years experience developing resource oriented APIs 3+ years experience designing and debugging databases Experience in multiple general purpose programming languages and building large, scaled full stack web solutions. More ❯

complex projects with minimal assistance. You architect high quality web applications, and design key tools and systems that support said web applications. Top Responsibilities: Write and review code in JavaScript or TypeScript, Java, Kotlin, Golang, and/or SQL Test, debug, maintain and/or update full-stack web applications. Write and review technical documents, including design, development, and revision … documents. Collaborate with Product, UX, QA, and engineering teams, to deliver new features Mandatory Skills/Qualifications: 3+ years experience writing JavaScript or TypeScript, Java, Kotlin, Golang, and/or SQL 3+ years experience developing resource oriented APIs 3+ years experience designing and debugging databases Experience in multiple general purpose programming languages and building large, scaled full stack web solutions. More ❯

complex projects with minimal assistance. You architect high quality web applications, and design key tools and systems that support said web applications. Top Responsibilities: Write and review code in JavaScript or TypeScript, Java, Kotlin, Golang, and/or SQL Test, debug, maintain and/or update full-stack web applications. Write and review technical documents, including design, development, and revision … documents. Collaborate with Product, UX, QA, and engineering teams, to deliver new features Mandatory Skills/Qualifications: 3+ years experience writing JavaScript or TypeScript, Java, Kotlin, Golang, and/or SQL 3+ years experience developing resource oriented APIs 3+ years experience designing and debugging databases Experience in multiple general purpose programming languages and building large, scaled full stack web solutions. More ❯

/Haskell/AI Senior Frontend Developer - Deep Tech GenAI Startup Title: Senior Frontend Developer Location: Hybrid, London (1 day a week on-site) Domain: AI startup, Engineering Tech: JavaScript, React, TypeScript, Elm, WebGL, Tailwind CSS, AI Salary: £90,000-£150,000 + equity (depending on experience) I'm working with a well-funded Deep Tech GenAI startup that is … interfaces. The frontend stack includes React, TypeScript, Elm, and WebGL, with the backend built mainly in Python and running on AWS. Core skills: Strong senior-level frontend expertise in JavaScript, React, and TypeScript Experience in functional programming (Elm, Haskell, WebGL) Proven track record in small, scaling teams BSc in Computer Science (or related discipline) from a leading university, or equivalent More ❯

/Haskell/AI Senior Frontend Developer - Deep Tech GenAI Startup Title: Senior Frontend Developer Location: Hybrid, London (1 day a week on-site) Domain: AI startup, Engineering Tech: JavaScript, React, TypeScript, Elm, WebGL, Tailwind CSS, AI Salary: £90,000-£150,000 + equity (depending on experience) I'm working with a well-funded Deep Tech GenAI startup that is … interfaces. The frontend stack includes React, TypeScript, Elm, and WebGL, with the backend built mainly in Python and running on AWS. Core skills: Strong senior-level frontend expertise in JavaScript, React, and TypeScript Experience in functional programming (Elm, Haskell, WebGL) Proven track record in small, scaling teams BSc in Computer Science (or related discipline) from a leading university, or equivalent More ❯

Apply your expertise in Microsoft Fabric to create scalable, robust, and secure data visualisation solutions Develop and maintain custom visuals, integrating advanced interactivity using DAX, Power Query, and (ideally) JavaScript or web technologies Support projects that use Tableau, Qlik, or other data visualisation tools as needed Mentor less experienced team members and promote best practices in data visualisation, design, and … Fluency: Experience with Tableau and Qlik is highly valuedyoull be comfortable switching between tools based on client requirements Custom Visualisation: Strong ability (or interest) in building custom visuals using JavaScript, HTML, CSS, or similar web technologies A.E.C. Domain Knowledge: Experience working with clients or data from the architecture, engineering, or construction sectors is a big plus Stakeholder Engagement: Comfortable gathering … or enterprise environment Experience working with Microsoft Fabric, data modelling, and data governance in a business setting Exposure to Tableau, Qlik, or other leading data visualisation tools Skills in JavaScript, HTML, CSS, or web development for building or customising visualisations (nice to have, but not essential) Strong understanding of data design principles, UI/UX, and dashboard performance tuning Experience More ❯

clients across multiple industries. What You'll Be Doing Technical Development Configure and customize ServiceNow modules across HR, IT, and Customer Service workflows Develop and maintain custom applications using JavaScript and Angular Leverage Now Assist, GenAI, and Workflow Data Fabric for modern, AI-driven solutions Experience Design Use Next Experience UI, UI Builder, and Service Portal to build intuitive and … sessions Work cross-functionally with teams in IT, HR, and customer service What We're Looking For Essential Skills: 2+ years of hands-on ServiceNow development Strong knowledge of JavaScript, HTML, CSS, Glide API, Flow Designer Experience across key ServiceNow workflows: ITSM, HRSD, CSM, Onboarding Understanding of customer/employee journey touchpoints Proven integration experience with REST/SOAP APIs More ❯

Clearance') This role is inside IR35 - Due to the service of the role, it will now be based on an Umbrella solution. Job role/experience required: Proficiency in JavaScript : Core scripting language used in ServiceNow. Experience with ServiceNow platform: Including modules like ITSM, ITOM, HRSD, CSM, and CMDB. ServiceNow Scripting : Client Scripts, Business Rules, Script Includes, UI Policies, and … point during the recruitment process, if there is a better way for us to communicate, please do let us know. Developer, Programmer, Engineer, ServiceNow, ITSM, Service Now, Service-Now, JavaScript, Security Check, Sc Level, Sc Cleared, Sc Clearance, Security Cleared, Security Clearance, Security Vetting Clearance, Active SC, SC Vetted, Cleared To A High Government Standard, Dv Cleared, Dv Clearance, Dv More ❯

Clearance") This role is inside IR35 - Due to the service of the role, it will now be based on an Umbrella solution. Job role/experience required: Proficiency in JavaScript : Core scripting language used in ServiceNow. Experience with ServiceNow platform: Including modules like ITSM, ITOM, HRSD, CSM, and CMDB. ServiceNow Scripting : Client Scripts, Business Rules, Script Includes, UI Policies, and … point during the recruitment process, if there is a better way for us to communicate, please do let us know. Developer, Programmer, Engineer, ServiceNow, ITSM, Service Now, Service-Now, JavaScript, Security Check, Sc Level, Sc Cleared, Sc Clearance, Security Cleared, Security Clearance, Security Vetting Clearance, Active SC, SC Vetted, Cleared To A High Government Standard, Dv Cleared, Dv Clearance, Dv More ❯

integrations, and building developer resources (APIs, SDKs, technical documentation). Solid experience across Integrations, Full Stack Web Development, and Cloud Architecture. Proficiency in one or more of the following: JavaScript, Node.js, Python (or equivalent modern frameworks/languages). Demonstrated success in leading technical teams, particularly those focused on integrations or developer-facing products. Exceptional interpersonal and communication skills – able …/Technical Integration Lead/API Integration Manager/SaaS Integration Engineer/Full Stack Developer/Solutions Architect/Cloud Engineer/Platform Integrations Lead/Node.js/JavaScript/Python/API/Cloud Architecture/Swagger/Computer Science/Software Engineering/Integration Architect/API Solutions Lead/Technical Project Manager/SaaS Platform Engineer More ❯