526 to 550 of 1,246 ECMAScript Jobs in London

leadership and team spirit Comfortable with customer relations and ability to understand business challenges Mastery: Languages: Java , XML Databases: Oracle, SQL Server PTC solution: Windchill Would be an asset: Javascript, HTML, CSS Docker, Unix, Linux, Windows PTC Solution : Thingworx Remote working position, ideally based in Stevenage or London with occasional travel to our clients' sites as part of the role. More ❯

leadership and team spirit Comfortable with customer relations and ability to understand business challenges Mastery: Languages: Java , XML Databases: Oracle, SQL Server PTC solution: Windchill Would be an asset: Javascript, HTML, CSS Docker, Unix, Linux, Windows PTC Solution : Thingworx Remote working position, ideally based in Stevenage or London with occasional travel to our clients' sites as part of the role. More ❯

updates and improvements. Work within a Git-based version control workflow and support clean deployment processes. Requirements 4+ years’ experience in professional WordPress development. Strong PHP, HTML5, CSS3, and JavaScript (ES6+) skills. Proven experience developing custom themes from scratch. Hands-on experience with Advanced Custom Fields (ACF) or similar tools. Experience writing and maintaining custom plugins . Familiarity with Git More ❯

experience in Java will include software design principles and familiarity with algorithms and data structures. What experience you'll have ● Database knowledge (SQL, schema design) ● Java ● Some knowledge of JavaScript and Node.js ● HTTP ● Json ● Web Development ● Proactive attitude ● Ability to own projects, work both independently and in a team, with rapidly changing priorities ● Core knowledge of algorithms and data structures More ❯

experience in Java will include software design principles and familiarity with algorithms and data structures. What experience you'll have ● Database knowledge (SQL, schema design) ● Java ● Some knowledge of JavaScript and Node.js ● HTTP ● Json ● Web Development ● Proactive attitude ● Ability to own projects, work both independently and in a team, with rapidly changing priorities ● Core knowledge of algorithms and data structures More ❯

experience in Java will include software design principles and familiarity with algorithms and data structures. What experience you'll have ● Database knowledge (SQL, schema design) ● Java ● Some knowledge of JavaScript and Node.js ● HTTP ● Json ● Web Development ● Proactive attitude ● Ability to own projects, work both independently and in a team, with rapidly changing priorities ● Core knowledge of algorithms and data structures More ❯

experience in Java will include software design principles and familiarity with algorithms and data structures. What experience you'll have ● Database knowledge (SQL, schema design) ● Java ● Some knowledge of JavaScript and Node.js ● HTTP ● Json ● Web Development ● Proactive attitude ● Ability to own projects, work both independently and in a team, with rapidly changing priorities ● Core knowledge of algorithms and data structures More ❯

developing custom plugins and modules within Craft. Familiarity with integrating third-party APIs and external systems. Experience of version control using Git. Understanding of front-end technologies (HTML, CSS, JavaScript) and ability to work full-stack when required. Ability to write clear, maintainable and well-documented code. Desired skills: Experience managing hosting environments and deployment workflows. Knowledge of performance optimisation More ❯

to project sensitivity Available now or with a max 1-month notice Able to work onsite in London or client site and happy to travel Experienced in: Python, SQL, JavaScript, TypeScript Palantir Foundry (strongly preferred) Client-facing consultancy background – confident working directly with stakeholders Willing to travel as needed 🚀 Why Join? Work That Matters – deliver real outcomes in national security More ❯

to project sensitivity Available now or with a max 1-month notice Able to work onsite in London or client site and happy to travel Experienced in: Python, SQL, JavaScript, TypeScript Palantir Foundry (strongly preferred) Client-facing consultancy background – confident working directly with stakeholders Willing to travel as needed 🚀 Why Join? Work That Matters – deliver real outcomes in national security More ❯

processes, and your own skills Qualifications & Skills: Bachelor's degree or higher in STEM subjects is required, or equivalent combination of education and experience will be considered Experience in JavaScript/React nice to have Excellent communication skills Able to use their own initiative and a go-getter attitude Enjoy finding solutions to a variety of problems Team player! Benefits More ❯

processes, and your own skills Qualifications & Skills: Bachelor's degree or higher in STEM subjects is required, or equivalent combination of education and experience will be considered Experience in JavaScript/React nice to have Excellent communication skills Able to use their own initiative and a go-getter attitude Enjoy finding solutions to a variety of problems Team player! Benefits More ❯

to project sensitivity Available now or with a max 1-month notice Able to work onsite in London or client site and happy to travel Experienced in: Python, SQL, JavaScript, TypeScript Palantir Foundry (strongly preferred) Client-facing consultancy background – confident working directly with stakeholders Willing to travel as needed 🚀 Why Join? Work That Matters – deliver real outcomes in national security More ❯

to project sensitivity Available now or with a max 1-month notice Able to work onsite in London or client site and happy to travel Experienced in: Python, SQL, JavaScript, TypeScript Palantir Foundry (strongly preferred) Client-facing consultancy background – confident working directly with stakeholders Willing to travel as needed 🚀 Why Join? Work That Matters – deliver real outcomes in national security More ❯

improvement Collaborate in Agile sprints, ceremonies, and incident management reviews Key Skills & Experience 5+ years of web development experience, with 3+ years in Shopify (Plus) Strong knowledge of Liquid , JavaScript , HTML/CSS , and GraphQL Experience with Shopify Admin API, Function APIs, UI Extensions Background working with Agile/DevOps teams , CI/CD pipelines, Git workflows Ability to provide More ❯

SDET with experience as a Performance Tester , ideally in a consultancy or client-facing environment. Proficiency in at least one object-oriented programming language (e.g., Java, Python, C#, or JavaScript/TypeScript) for writing clean, maintainable test code and frameworks. Strong knowledge of performance testing methodologies, tools, and scripting .But equally happy with functional test automation Ability to engage with More ❯

Investigate emerging frontend technologies and AI applications to advance demonstration methodologies Provide technical mentorship and elevate engineering standards across the solutions team What You'll Bring Demonstrated expertise in JavaScript/TypeScript, React, and Next.js with production deployment experience Professional background implementing or integrating CMS or eCommerce solutions with headless or composable platforms Proficiency building API integrations (REST/GraphQL More ❯

to customers with varying technical backgrounds Organized, detail oriented, and comfortable owning tools and processes A self starter who enjoys both customer interaction and technical investigation Nice to have JavaScript/AngularJS: use browser DevTools to capture errors and surface actionable details C# (.NET 8): deeper debugging, reading stack traces, mapping logging entries to code paths Azure operations: inspect app More ❯

agentic systems. Both on performance and compliance (harm, guardrails, etc) 4+ years of development competency across a variety of languages, frameworks, and tooling, such as Python, R, Kubernetes, Kubeflow, JavaScript/JVM, Kafka Background in Application development, deployment, and monitoring on Kubernetes Proficient in PyTorch or similar frameworks (e.g Tensorflow) – demonstrates strong understanding of neural networks and LLMs; familiar with More ❯

agentic systems. Both on performance and compliance (harm, guardrails, etc) 4+ years of development competency across a variety of languages, frameworks, and tooling, such as Python, R, Kubernetes, Kubeflow, JavaScript/JVM, Kafka Background in Application development, deployment, and monitoring on Kubernetes Proficient in PyTorch or similar frameworks (e.g Tensorflow) – demonstrates strong understanding of neural networks and LLMs; familiar with More ❯

agentic systems. Both on performance and compliance (harm, guardrails, etc) 4+ years of development competency across a variety of languages, frameworks, and tooling, such as Python, R, Kubernetes, Kubeflow, JavaScript/JVM, Kafka Background in Application development, deployment, and monitoring on Kubernetes Proficient in PyTorch or similar frameworks (e.g Tensorflow) – demonstrates strong understanding of neural networks and LLMs; familiar with More ❯

agentic systems. Both on performance and compliance (harm, guardrails, etc) 4+ years of development competency across a variety of languages, frameworks, and tooling, such as Python, R, Kubernetes, Kubeflow, JavaScript/JVM, Kafka Background in Application development, deployment, and monitoring on Kubernetes Proficient in PyTorch or similar frameworks (e.g Tensorflow) – demonstrates strong understanding of neural networks and LLMs; familiar with More ❯

/weekends during major sports events. What you’ll bring 1–3 years in technical operations, reliability/SRE, support engineering, or data operations. Comfortable with a scripting language (JavaScript or Python); familiarity with a strongly-typed language (Rust/Java/C/C++) is a plus. Hands-on debugging skills: reading logs, calling API endpoints, basic troubleshooting on More ❯

/weekends during major sports events. What you’ll bring 1–3 years in technical operations, reliability/SRE, support engineering, or data operations. Comfortable with a scripting language (JavaScript or Python); familiarity with a strongly-typed language (Rust/Java/C/C++) is a plus. Hands-on debugging skills: reading logs, calling API endpoints, basic troubleshooting on More ❯

/weekends during major sports events. What you’ll bring 1–3 years in technical operations, reliability/SRE, support engineering, or data operations. Comfortable with a scripting language (JavaScript or Python); familiarity with a strongly-typed language (Rust/Java/C/C++) is a plus. Hands-on debugging skills: reading logs, calling API endpoints, basic troubleshooting on More ❯