451 to 475 of 1,296 ECMAScript Jobs in London

on work: everything is about edge, speed, and better decisions. Top of the market compensation. High visibility. High expectations. No bureaucracy. Core requirements Expert-level proficiency in Python and JavaScript/TypeScript/React. 3+ years professional software engineering experience. Strong CS fundamentals (data structures, algorithms, performance). Comfortable building for live, data-heavy, real-time environments. Sharp communicator whos More ❯

administration, or consulting roles. - Strong proficiency in SharePoint Online, SharePoint 2016/2019, and Office 365. - Expertise in SharePoint Framework (SPFx), PowerShell, REST APIs, and SharePoint Designer. - Proficiency in JavaScript, C#, HTML/CSS, and SQL Server for custom development and integration. - Experience with document management best practises, including metadata tagging, version control, and retention policies. - Familiarity with AI integration More ❯

workflows. Champion Ethical AI: Ensure your agents comply with regulations (GDPR, financial compliance) and guard against bias, hallucinations, and misuse. What You Bring Technical Mastery: Strong skills in Python, JavaScript, or similar languages. LLM & Agent Expertise: Hands-on experience with LLMs (OpenAI, Anthropic, Mistral) and agent frameworks. Advanced Tools: Familiarity with vector databases, RAG pipelines, prompt engineering, REST APIs, cloud More ❯

Networking/TCP/Firewalls/Certs Observability champion, experience of designing and building monitoring and logging tools such as CloudWatch, ELK, and Grafana Strong scripting skills in Bash, JavaScript or similar knowledge of SecDevOps security best practices and experience implementing security controls in a cloud environment including SIEM, Guard Duty, Shield, Inspector and Security Hub Experience with CI/ More ❯

Networking/TCP/Firewalls/Certs Observability champion, experience of designing and building monitoring and logging tools such as CloudWatch, ELK, and Grafana Strong scripting skills in Bash, JavaScript or similar knowledge of SecDevOps security best practices and experience implementing security controls in a cloud environment including SIEM, Guard Duty, Shield, Inspector and Security Hub Experience with CI/ More ❯

Networking/TCP/Firewalls/Certs Observability champion, experience of designing and building monitoring and logging tools such as CloudWatch, ELK, and Grafana Strong scripting skills in Bash, JavaScript or similar knowledge of SecDevOps security best practices and experience implementing security controls in a cloud environment including SIEM, Guard Duty, Shield, Inspector and Security Hub Experience with CI/ More ❯

Networking/TCP/Firewalls/Certs Observability champion, experience of designing and building monitoring and logging tools such as CloudWatch, ELK, and Grafana Strong scripting skills in Bash, JavaScript or similar knowledge of SecDevOps security best practices and experience implementing security controls in a cloud environment including SIEM, Guard Duty, Shield, Inspector and Security Hub Experience with CI/ More ❯

and innovation. Requirements Proven experience leading and scaling engineering teams within start-ups or high-growth environments. 8+ years’ hands-on software development experience (Python preferred; additional exposure to JavaScript/TypeScript or Go beneficial). Strong background in AI systems, cloud-native architectures, and modern ML tooling (LangChain, OpenAI API, vector stores, RAG pipelines). Experience designing distributed, high More ❯

and innovation. Requirements Proven experience leading and scaling engineering teams within start-ups or high-growth environments. 8+ years hands-on software development experience (Python preferred; additional exposure to JavaScript/TypeScript or Go beneficial). Strong background in AI systems, cloud-native architectures, and modern ML tooling (LangChain, OpenAI API, vector stores, RAG pipelines). Experience designing distributed, high More ❯

and innovation. Requirements Proven experience leading and scaling engineering teams within start-ups or high-growth environments. 8+ years’ hands-on software development experience (Python preferred; additional exposure to JavaScript/TypeScript or Go beneficial). Strong background in AI systems, cloud-native architectures, and modern ML tooling (LangChain, OpenAI API, vector stores, RAG pipelines). Experience designing distributed, high More ❯

Salesforce Industries/Vlocity . Strong working knowledge of OmniStudio , including OmniScripts , Integration Procedures (Omni Processes) , and Data Mappers (Data Raptors) . Experience with Apex , Lightning Web Components , and JavaScript . Integration exposure using MuleSoft, Apigee , or Connected Apps . Familiar with Salesforce sharing model , automated testing tools (Provar, Selenium), and agile delivery methods . Excellent problem-solving, communication, and More ❯

Salesforce Industries/Vlocity . Strong working knowledge of OmniStudio , including OmniScripts , Integration Procedures (Omni Processes) , and Data Mappers (Data Raptors) . Experience with Apex , Lightning Web Components , and JavaScript . Integration exposure using MuleSoft, Apigee , or Connected Apps . Familiar with Salesforce sharing model , automated testing tools (Provar, Selenium), and agile delivery methods . Excellent problem-solving, communication, and More ❯

Salesforce Industries/Vlocity . Strong working knowledge of OmniStudio , including OmniScripts , Integration Procedures (Omni Processes) , and Data Mappers (Data Raptors) . Experience with Apex , Lightning Web Components , and JavaScript . Integration exposure using MuleSoft, Apigee , or Connected Apps . Familiar with Salesforce sharing model , automated testing tools (Provar, Selenium), and agile delivery methods . Excellent problem-solving, communication, and More ❯

Salesforce Industries/Vlocity . Strong working knowledge of OmniStudio , including OmniScripts , Integration Procedures (Omni Processes) , and Data Mappers (Data Raptors) . Experience with Apex , Lightning Web Components , and JavaScript . Integration exposure using MuleSoft, Apigee , or Connected Apps . Familiar with Salesforce sharing model , automated testing tools (Provar, Selenium), and agile delivery methods . Excellent problem-solving, communication, and More ❯

Desirable Expertise Microsoft Certifications in Power Platform and/or Copilot. Previous RPA experience (UiPath, Power Automate Desktop, Blue Prism, Automation Anywhere). Knowledge of coding languages (e.g., .NET, JavaScript, Python) to extend low-code solutions. (Not essential though) Experience integrating Power Platform with Azure AI services or other enterprise systems. What Were Loo king For A natural leader and More ❯

of failure and architect solutions that'll scale with the business. The Tech (Don't Worry If Shopify Is New to You) They're using: Shopify Plus, Liquid, React, JavaScript, GraphQL, HTML/CSS If you've got Node.js or full-stack chops too, that's a bonus, but not essential. What You'll Actually Be Doing Year 1 Priority More ❯

of failure and architect solutions that'll scale with the business. The Tech (Don't Worry If Shopify Is New to You) They're using: Shopify Plus, Liquid, React, JavaScript, GraphQL, HTML/CSS If you've got Node.js or full-stack chops too, that's a bonus, but not essential. What You'll Actually Be Doing Year 1 Priority More ❯

of failure and architect solutions that'll scale with the business. The Tech (Don't Worry If Shopify Is New to You) They're using: Shopify Plus, Liquid, React, JavaScript, GraphQL, HTML/CSS If you've got Node.js or full-stack chops too, that's a bonus, but not essential. What You'll Actually Be Doing Year 1 Priority More ❯

of failure and architect solutions that'll scale with the business. The Tech (Don't Worry If Shopify Is New to You) They're using: Shopify Plus, Liquid, React, JavaScript, GraphQL, HTML/CSS If you've got Node.js or full-stack chops too, that's a bonus, but not essential. What You'll Actually Be Doing Year 1 Priority More ❯

What We’re Looking For: Core Skills: Expertise in PHP , Laravel , and the LAMP stack . Experience in multi-instance platform development and user permissions systems. Strong knowledge of JavaScript, JQuery , and front-end collaboration. Solid understanding of HTML/CSS and best practices. Proficiency in GitHub and documentation practices. Experience with payment or subscription systems. Desirable Experience: Knowledge of More ❯

directly shapes the next generation of AI models. Qualifications: * Fluency in English (native or bilingual level). * Proficiency in at least one of the following programming languages or frameworks: JavaScript, TypeScript, Python, C, C#, C++, React, Go, Java, Kotlin, or Swift. * Excellent writing and grammar skills. * A bachelor’s degree (completed or in progress). * Previous experience as a Software More ❯

clients or colleagues Industry experience in the retail banking or wider financial services sector Additional technical experience in any of the following – PySpark, Microsoft Azure, VBA, HTML/CSS, JavaScript, JQuery, SQL, PHP, Power Automate, Power BI What we offer A highly competitive salary A genuinely compelling profit share scheme, with the potential to own a significant stake in the More ❯

clients or colleagues Industry experience in the retail banking or wider financial services sector Additional technical experience in any of the following – PySpark, Microsoft Azure, VBA, HTML/CSS, JavaScript, JQuery, SQL, PHP, Power Automate, Power BI What we offer A highly competitive salary A genuinely compelling profit share scheme, with the potential to own a significant stake in the More ❯

subject matter expert for API Platform and services to support customer integrations on occasion All About You 8+ years professional, hands-on, frontend application development experience. Expert React ES6 Javascript and Typescript skills including areas of functional and asynchronous programming. Expert CSS development knowledge and experience with both native and using frameworks e.g. bootstrap, tailwind, mui, etc. Strong working knowledge More ❯

first-hand knowledge of our culture, people, business, and impact within the marketplace. 2026 BNY Summer Internship Program - Engineering (Developer) interns will participate in a robust technical experience in JavaScript, Python, CSS, Java, and more. Developer Provides application software development services or technical support in relatively straightforward projects. Understands and follows the Software Development Life Cycle. Prepares and executes test More ❯