151 to 175 of 435 ECMAScript Jobs in London

design tools including Figma, Adobe XD, Axure, and Balsamiq. Familiar with research and analysis tools such as Dovetail, Mural, and Microsoft Forms. Knowledge of front-end technologies (HTML, CSS, JavaScript) and analytical tools like Google Analytics (both desirable). Comfortable working within Agile frameworks and collaborating across multidisciplinary teams. Experience working with Government Digital Service (GDS) standards and practices (desirable More ❯

Job Description: Develop and maintain AI-powered web applications using React, JavaScript, and Python, ensuring high performance and scalability. Integrate AI/ML models into production systems, working closely with data scientists to optimize deployment and performance. Design and implement end-to-end full-stack architectures, including front-end UI, back-end services, and database management. Stay updated on emerging More ❯

record in designing data functions and bringing business users on a journey of adoption Technical understanding of data tooling including; SQL and Microsoft Azure and familiarity of Python and JavaScript would be advantageous More ❯

record in designing data functions and bringing business users on a journey of adoption Technical understanding of data tooling including; SQL and Microsoft Azure and familiarity of Python and JavaScript would be advantageous More ❯

will lead the design, development, and implementation of trading applications while driving the technical direction of the team. The ideal candidate: Expertise in UI using React/Typescript/JavaScript and OO design. Experience in HTML, React, Typescript, JavaScript. Experience in UI Libraries such as Material UI or Ant Design etc. Experience of Trading Business domain. If this sounds like More ❯

will lead the design, development, and implementation of trading applications while driving the technical direction of the team. The ideal candidate: Expertise in UI using React/Typescript/JavaScript and OO design. Experience in HTML, React, Typescript, JavaScript. Experience in UI Libraries such as Material UI or Ant Design etc. Experience of Trading Business domain. If this sounds like More ❯

and sold to external customers. Reporting to the COO, this is a key role and as such has relatively complex requirements that balance recent, hands on coding experience (C#, Javascript/Angular) with architecture responsibilities and oversight of devops/infrastructure. There is also line responsibility for an offshore development team, so the successful candidate will be able to demonstrate More ❯

and sold to external customers. Reporting to the COO, this is a key role and as such has relatively complex requirements that balance recent, hands on coding experience (C#, Javascript/Angular) with architecture responsibilities and oversight of devops/infrastructure. There is also line responsibility for an offshore development team, so the successful candidate will be able to demonstrate More ❯

10+ years of experience in quality assurance, with a balanced focus on both manual and automated testing - UI, API & DB. Proficiency in one or more programming languages (Python, JavaScript, C#) to develop effective automation scripts. Strong experience in maintaining automated regression packs and contributing to sprint testing. Strong collaboration skills to work effectively with BAs and developers on refining requirements More ❯

party integrations. Knowledge of ServiceNow Workflows: Designing and implementing Flow Designer and legacy Workflow Editor and Service Portal Development: Custom widgets, pages, and themes. You will be proficient in JavaScript: Core scripting language used in ServiceNow. Hands-on experience in ServiceNow development and administration and also experience in Agile/Scrum environments and using tools like Jira or Azure DevOps More ❯

may not be best for this role. They need proactive, adaptable individuals that can wear multiple hats. We are looking for Engineers that have experience with: Frontend UI Engineering Javascript, HTML CSS Figma Fintech experience would be a plus This is a perm role and will operate a hybrid model of 3 days onsite in Old Street & 2 days from More ❯

experience building and running resilient cloud platforms, and you enjoy leading teams that sit at the intersection of infrastructure and product. You're a pragmatic software engineer -comfortable with JavaScript/TypeScript but also open to other languages like Go or Python. You take a product mindset to platform work: engaging with stakeholders, framing problems, setting priorities, and communicating trade More ❯

experience building and running resilient cloud platforms, and you enjoy leading teams that sit at the intersection of infrastructure and product. You're a pragmatic software engineer -comfortable with JavaScript/TypeScript but also open to other languages like Go or Python. You take a product mindset to platform work: engaging with stakeholders, framing problems, setting priorities, and communicating trade More ❯

your own steam. Key skills required for this role: Demonstrated track record of developing and delivering mobile applications, ideally using React Native. High level of proficiency in TypeScript and JavaScript, with a focus on clean, maintainable code. Hands-on experience building backend services with Node.js. Knowledge of contemporary frontend and backend frameworks, with the ability to adapt to new technologies. More ❯

multiple eTrading React Developers on a long-term contract basis for a business-critical project in the front-office space. What you'll need to succeed Extensive React and Javascript development experience within a front-office/eTrading environment - Mandatory. Strong knowledge of a range of asset classes, preferably FX. 10+ years' frontend development experience within financial services. Strong proven More ❯

Duration : 12 months The role: A leading Central Government Institution are seeking x2 ServiceNow Developers, supporting the development of enterprise workflows and data-driven decisions. Technical Skills 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 More ❯

sector client. You will have extensive experience of D365 CE/CRM and Power Platform. Skills: D365 CE/CRM Power Platform Azure - IaaS/PaaS services .Net, C#, Javascript, TypeScript Strong knowledge of Performance tuning in D365 implementations Responsibilities: Focus on owning and managing performance improvements in D365 implementations Design and implement performance tuning strategies Analyse telemetry, logs, and More ❯

reviews and share knowledge with peers Build strong working relationships with partner technical teams Help shape technical strategy based on partner feedback and product priorities Tech Stack & Tools Essential: JavaScript (2–3 years) React (2–3 years) PHP or Hack Desirable: HTML5/Instant Game development experience Background in gaming or developer platforms Familiarity with internal tooling and developer experience More ❯

diverse technical teams Strong software engineering skills in data-intensive environments Nice to Have Knowledge of machine learning principles and frameworks (e.g., PyTorch) Experience in front-end technologies like JavaScript Exposure to full-stack development or ML infrastructure Previous experience in high-scale software or research environments More ❯

external integrations Managing data imports, CMDB structure, and Discovery Supporting performance analytics and reporting across services What We're Looking For Hands-on experience in ServiceNow development and scripting (JavaScript essential) Strong skills with Client Scripts, Script Includes, UI Policies, and Business Rules Demonstrated knowledge of ServiceNow architecture and module configuration Experience working in agile teams, ideally using Jira or More ❯

connecting applications. · Proficient with Microsoft Office Suite. · Full project lifecycle experience (preferred). Skills: · Experience working with Dynamics 365 sales, specifically doing configurations, customisations and integrations. · Proficiency in C#, JavaScript, HTML + Power Platform · Excellent problem-solving skills and ability to foresee potential system issues and prevent them. ALL APPLICANTS MUST BE FREE TO WORK IN THE UK FREE FROM More ❯

connecting applications. · Proficient with Microsoft Office Suite. · Full project lifecycle experience (preferred). Skills: · Experience working with Dynamics 365 sales, specifically doing configurations, customisations and integrations. · Proficiency in C#, JavaScript, HTML + Power Platform · Excellent problem-solving skills and ability to foresee potential system issues and prevent them. ALL APPLICANTS MUST BE FREE TO WORK IN THE UK FREE FROM More ❯

Excellent communication skills, comfortable working with technical and finance stakeholders alike. Desirable Skills & Experience Experience with system integration's and APIs. Background in software development or scripting (SQL, Python, JavaScript). Exposure to other business applications and willingness to support wider systems. Experience in a hybrid IT/Finance role. Why Join Us? Opportunity to shape and improve core finance More ❯

governance. Support platform upgrades, patching, and performance tuning. Troubleshoot and resolve technical issues and defects. Required qualifications Experience developing on the ServiceNow platform in a professional setting. Proficiency in JavaScript, Glide API, and ServiceNow development tools. Familiarity with REST/SOAP APIs, IntegrationHub, and MID Servers. Understanding of ITIL processes and service management principles. Strong problem-solving and communication skills. More ❯

Experience: Strong in software development, with significant experience guiding technical direction, managing engineering efforts, and delivering projects from concept to launch. Full-stack fluency - Deep knowledge of TypeScript/JavaScript and confidence working across the stack to solve complex technical challenges. Mobile architecture pro - A history of architecting and delivering large-scale React Native mobile apps that have gone live More ❯