276 to 300 of 435 JavaScript Jobs in the City of London

of frontend performance, accessibility, and interactivity. Write and maintain comprehensive unit and end-to-end tests to ensure reliability at scale. You should have Strong experience with TypeScript/JavaScript and modern frameworks (React or similar). A proven track record of delivering polished, performant, and elegant user interfaces. Deep appreciation for UI/UX craftsmanship and accessibility. Familiarity with More ❯

structure, and internal linking. Support ongoing technical SEO audits and accessibility improvements. Create and enhance digital imagery and layouts using Canva or Photoshop. Requirements: Proficiency in HTML, CSS, and JavaScript would be preferred. Proven experience customising Shopify themes beyond page builders. Understanding of conversion rate optimisation (CRO) strategies and tools. Excellent eye for design, user experience, and detail. Familiarity with More ❯

structure, and internal linking. Support ongoing technical SEO audits and accessibility improvements. Create and enhance digital imagery and layouts using Canva or Photoshop. Requirements: Proficiency in HTML, CSS, and JavaScript would be preferred. Proven experience customising Shopify themes beyond page builders. Understanding of conversion rate optimisation (CRO) strategies and tools. Excellent eye for design, user experience, and detail. Familiarity with More ❯

ServiceNow. Skills required: Certified ServiceNow IRM/SecOps administrator/consultant (this is mandatory) Must have concluded at least 1 lifecycle of ServiceNow IRM/SecOps implementation. Experience in JavaScript, API, Web Services Working knowledge of Vulnerability Mgmt. process & tools ISO/CISA/CISM/CISSP/CRICS (preferred) Platform expertise required: ServiceNow GRC & SecOps. More ❯

ServiceNow. Skills required: Certified ServiceNow IRM/SecOps administrator/consultant (this is mandatory) Must have concluded at least 1 lifecycle of ServiceNow IRM/SecOps implementation. Experience in JavaScript, API, Web Services Working knowledge of Vulnerability Mgmt. process & tools ISO/CISA/CISM/CISSP/CRICS (preferred) Platform expertise required: ServiceNow GRC & SecOps. More ❯

responsive design. Collaborative mindset and openness to feedback. Strong organisational skills with the ability to work on multiple tasks. Basic knowledge of front-end technologies (HTML/CSS/JavaScript) is desirable. Previous experience is Contentsquare and or Dynamic Yield is desirable. More ❯

responsive design. Collaborative mindset and openness to feedback. Strong organisational skills with the ability to work on multiple tasks. Basic knowledge of front-end technologies (HTML/CSS/JavaScript) is desirable. Previous experience is Contentsquare and or Dynamic Yield is desirable. More ❯

attitude towards learning and adapting to new technologies and industry best practices Ability to work autonomously as well as collaboratively within a team setting Proficiency in Java, .NET and JavaScript Experience working with AWS and Infrastructure as Code Experience in supporting a trading or investment platform Information Technology degree or equivalent experience CMC Markets is an equal opportunities employer and More ❯

real-time data collectors and AI specialists to elite journalists and cloud engineers, our team turns raw numbers into magic. Our tech experts work with advanced cloud solutions, Java, JavaScript, and Python, using AI and machine learning to extract insights and deliver them via APIs. Were looking for a visionary and commercially astute leader to join our Rights team as More ❯

Performance Tuning & Optimization: Identify and address performance bottlenecks, ensuring the scalability and optimal performance of ServiceNow applications. Advanced Scripting & Development: Possess expert-level experience with ServiceNow scripting (Server-side JavaScript, GlideRecord, GlideSystem, UI Policies, Business Rules, Client Scripts, Script Includes) and the development of custom applications. Agile Leadership: Guide agile development teams from a technical perspective, ensuring that user stories More ❯

Performance Tuning & Optimization: Identify and address performance bottlenecks, ensuring the scalability and optimal performance of ServiceNow applications. Advanced Scripting & Development: Possess expert-level experience with ServiceNow scripting (Server-side JavaScript, GlideRecord, GlideSystem, UI Policies, Business Rules, Client Scripts, Script Includes) and the development of custom applications. Agile Leadership: Guide agile development teams from a technical perspective, ensuring that user stories More ❯

and deliver under pressure in complex technical environments. Tech Stack & Environment You’ll work across a diverse range of modern technologies, including: Core languages: C#, Python, Rust Front end: JavaScript/TypeScript/Angular/RX JS Infrastructure: Kubernetes, containers, DevOps, CI/CD Emerging tech: WebAssembly, AI integration, and AI frameworks Systems: Cross-platform, distributed, scalable real-time environments … Proven experience designing and developing complex, distributed, real-time systems . Deep understanding of software architecture, concurrency, performance optimisation , and system reliability . Demonstrable front-end engineering experience using JavaScript, TypeScript, Angular or React Familiarity with containerisation (Kubernetes, Docker) and modern DevOps practices . Experience in front-office risk, trading, or analytics systems within financial markets. Desirable/Highly Valued More ❯

and deliver under pressure in complex technical environments. Tech Stack & Environment You’ll work across a diverse range of modern technologies, including: Core languages: C#, Python, Rust Front end: JavaScript/TypeScript/Angular/RX JS Infrastructure: Kubernetes, containers, DevOps, CI/CD Emerging tech: WebAssembly, AI integration, and AI frameworks Systems: Cross-platform, distributed, scalable real-time environments … Proven experience designing and developing complex, distributed, real-time systems . Deep understanding of software architecture, concurrency, performance optimisation , and system reliability . Demonstrable front-end engineering experience using JavaScript, TypeScript, Angular or React Familiarity with containerisation (Kubernetes, Docker) and modern DevOps practices . Experience in front-office risk, trading, or analytics systems within financial markets. Desirable/Highly Valued More ❯

design tailored solutions Collaborate on implementing AI and machine learning models Serve as a point of contact, providing consultative guidance and support Requirements: Proven programming skills in Python and JavaScript Familiarity with Palantir is a plus Excellent communication and consultative abilities Must hold SC or DV Clearance Please apply if this is of interest. More ❯

design tailored solutions Collaborate on implementing AI and machine learning models Serve as a point of contact, providing consultative guidance and support Requirements: Proven programming skills in Python and JavaScript Familiarity with Palantir is a plus Excellent communication and consultative abilities Must hold SC or DV Clearance Please apply if this is of interest. More ❯

closely with product, engineering, and leadership What we’re looking for: Strong commercial experience building and deploying ML models in production Proficiency in Python and familiarity with TypeScript/JavaScript Experience with NLP or recommendation systems is a bonus Excited by start-ups: product-minded, hands-on, and motivated by impact What’s on offer: £100,000 - £120,000 salary More ❯

closely with product, engineering, and leadership What we’re looking for: Strong commercial experience building and deploying ML models in production Proficiency in Python and familiarity with TypeScript/JavaScript Experience with NLP or recommendation systems is a bonus Excited by start-ups: product-minded, hands-on, and motivated by impact What’s on offer: £100,000 - £120,000 salary More ❯

experience: Knowledge of the following workflows within ServiceNow: Customer Experience & Employee Experience Knowledge of the following modules: HRSD or CSM Demonstratable experience in the following: ServiceNow web services & APIs, JavaScript, Flow Configuration, relational databases, and Web Technologies Ability to engage with stakeholders at all levels of an organisation from all relevant business areas As a ServiceNow Developer within this values More ❯

with traders, quants, and back-end engineers to deliver seamless UI experiences. Contribute to architectural decisions and front-end performance tuning. Required Skills & Experience Expertise in React.js and modern JavaScript (ES6+) Proven experience delivering front-end applications in electronic trading environments Strong understanding of performance optimisation and low-latency UI design Experience with real-time data technologies (WebSockets, FIX, etc. More ❯

experience: Knowledge of the following workflows within ServiceNow: Customer Experience & Employee Experience Knowledge of the following modules: HRSD or CSM Demonstratable experience in the following: ServiceNow web services & APIs, JavaScript, Flow Configuration, relational databases, and Web Technologies Ability to engage with stakeholders at all levels of an organisation from all relevant business areas As a ServiceNow Developer within this values More ❯

with traders, quants, and back-end engineers to deliver seamless UI experiences. Contribute to architectural decisions and front-end performance tuning. Required Skills & Experience Expertise in React.js and modern JavaScript (ES6+) Proven experience delivering front-end applications in electronic trading environments Strong understanding of performance optimisation and low-latency UI design Experience with real-time data technologies (WebSockets, FIX, etc. More ❯

the codebase and help scale a new small engineering team of 4 engineers to begin with. Job Requirements : Over 8 years experience in software engineering Experience with Scala and Javascript projects AWS is nice to have Good people management skills Some technical skills to offer technical leadership Ability to lead and manage a team, overlooking the product goals for the More ❯

the codebase and help scale a new small engineering team of 4 engineers to begin with. Job Requirements : Over 8 years experience in software engineering Experience with Scala and Javascript projects AWS is nice to have Good people management skills Some technical skills to offer technical leadership Ability to lead and manage a team, overlooking the product goals for the More ❯

Part 2) into multiple operating environments with both encode and decoder capability, these include: Android (Android X/ExoPlayer for playback) iOS (AVPlayer and VTDS/VTCS frameworks), FFmpeg, JavaScript based web decoders, native Chromium browser and WebRTC, ALVR (Air Light VR). Working with the decoder and encoder teams to support maintenance and improvements in the core C++ codec More ❯

Part 2) into multiple operating environments with both encode and decoder capability, these include: Android (Android X/ExoPlayer for playback) iOS (AVPlayer and VTDS/VTCS frameworks), FFmpeg, JavaScript based web decoders, native Chromium browser and WebRTC, ALVR (Air Light VR). Working with the decoder and encoder teams to support maintenance and improvements in the core C++ codec More ❯