1 to 25 of 277 ECMAScript Jobs in London

continuous improvement. Your responsibilities Design, build and evolve scalable back-end services using C# and .NET Core, alongside developing front-end features with modern JavaScript frameworks to enhance user experience. Design and implement RESTful APIs, ensuring high standards of performance, reliability and security. Build, deploy and operate services ...

continuous improvement. Your responsibilities Design, build and evolve scalable back-end services using C# and .NET Core, alongside developing front-end features with modern JavaScript frameworks to enhance user experience. Design and implement RESTful APIs, ensuring high standards of performance, reliability and security. Build, deploy and operate services ...

Proficiency in writing and executing various types of tests including unit, system, performance, and integration tests. Proficiency in frontend technologies: HTML, CSS (Sass) and JavaScript (React.js) and experience in writing automated tests. Experience of working with a wide variety of stakeholders including product owners, delivery managers and architects. Experience ...

development, including design, development, testing, and deployment. Some of the languages and frameworks our teams work with: Java Python C#/.NET Full stack JavaScript (React, Node.js etc.) We expect you to have deep experience in at least one of the above, you will also be flexible and comfortable picking ...

software development experience, with at least 3 years in a senior or technical lead role. Proven expertise in full-stack development using: TypeScript (and JavaScript frameworks such as NextJS, Node, or Tailwind) Python (including frameworks like Django, Flask, or FastAPI) PostgreSQL and relational database design, optimization, and maintenance. AI Development ...

from the roadmap. Solve ambiguous problems with scalable solutions. Skills Knowledge and Expertise Essential: Strong expertise in Python web development frameworks (e.g., Django) and JavaScript/TypeScript, with experience working in cloud environments such as AWS, Azure, or GCP. Skilled in applying software technical design principles to build scalable, secure ...

looking for Experience as a Software Engineer in one or more of the following: Backend development (Java Spring Boot, Maven, Python) Frontend development (JavaScript/TypeScript, React, npm) Familiarity with CI/CD, containerisation, deployment tools and cloud platforms (e.g. Jenkins, Kubernetes, Docker, AWS). Understanding of database technologies such ...

experience with: Infrastructure as Code (Terraform, Ansible or similar) CI/CD pipelines and DevOps tooling C# (.NET 8+) and/or Java (Spring) JavaScript using a modern framework (React, Angular or similar) Bash and PowerShell AWS, ideally including Amazon Connect Containerisation and orchestration (Docker, Kubernetes) Linux environments Nice ...

manage multiple projects and priorities in a fast-paced environment Technical Skills Power Platform (Power Apps, Power Automate, Power Pages, Power BI) Python, JavaScript, TypeScript, Angular or React ASP.NET Core, Entity Framework, REST APIs, Swagger/OpenAPI SQL Server, PostgreSQL, NoSQL databases, vector databases FastAPI and AI service integrations (OpenAI ...

have: 5+ years of experience building frontend applications Strong proficiency in React and Next.js Understanding of SSR, SSG, and modern rendering strategies Strong JavaScript/TypeScript, HTML, and CSS skills Experience with Azure cloud environments Experience with Azure DevOps Experience with scalable SaaS applications Experience with REST APIs Understanding ...

tools to augment software development Experience with financial or billing-related systems is a plus Basic experience building Node.js services using JavaScript or TypeScript is beneficial Our Offer Flexi-Week and Work-Life Balance: We prioritise your mental health and wellbeing, offering you a flexible four-day Flexi-Week ...

solutions; manage product backlog with Product Owner Write, review, and approve specifications; conduct code reviews Develop, test, and implement software using Java, C#, SQL, JavaScript Mentor team members on technical and financial domain expertise Coordinate cross-team integration and provide customer support Skills Required Technical: Java, C#, Python, API development ...

extend) Outside IR35 1 x Immediate Start 1 x July Start Technology Environment The core stack includes: C#/.NET/.NET Core TypeScript & JavaScript We are also looking for engineers with broader experience across modern technologies such as: React Python Node.js REST APIs & Microservices SQL/NoSQL Databases Docker ...

development Git and version control Experience with relational and/or NoSQL databases Nice to have Exposure to Node.js and TypeScript Experience working with JavaScript-based frontends Azure DevOps or GitHub Actions Docker and Kubernetes Microservices architecture Messaging or event-driven systems Reasonable Adjustments: Respect and equality are core values ...

application development (.NET Core, C#) or winforms/WPF (C#) development. Our client will provide you with training into: .NET 10.0, WPF, MVVM, Prism, JavaScript, React, Angular 21, Microservices, MongoDB, Vue.js, TypeScript, Azure, AWS, ASP.NET Core Web API, Entity Framework, Node.js, Elasticsearch, Agile, TDD, BDD, Scrum, Kanban and Azure SQL. ...

such as Sitecore, Optimizely, Umbraco, Alterian, Immediacy, Ektron, Kentico, Sitefinity or dotnetnuke. Our client can provide you with industry recognised training in: .NET 10.0, JavaScript, React, Angular 21, Microservices, MongoDB, Vue.js, TypeScript, Azure, AWS, ASP.NET Core Web API, Entity Framework, Node.js, Elasticsearch, Agile, TDD, BDD, Scrum, Kanban and MongoDB. This ...

hear from you: Technical Skills Experience building cloud-hosted consumer applications usingopen sourcetechnologies such as Pythonor Node Knowledge of modern frontend development, including JavaScript/TypeScript with frameworks like React or Next.js, and experience building intuitive, user-focused interfaces Experience designing and implementing backend systems, ideally using Python for data ...

SENIOR SOFTWARE ENGINEER TO HAVE.... Current enhanced DV clearance Experience with at least one or more of the following: Java, Python, C++, .NET, C#, JavaScript, React Experience mentoring juniors or leading a team Experience/Knowledge of automation IT WOULD BE NICE FOR THE SENIOR SOFTWARE ENGINEER TO HAVE.... Cloud ...

enabling data scientists and engineers with Python-based development workflows and tooling Technology Stack: Azure Cloud Services C# (.NET 10) Python React.js and modern JavaScript (ES6+) Snowflake (Data Warehouse) Apache Airflow Terraform dbt SQL Server ...

enabling data scientists and engineers with Python-based development workflows and tooling Technology Stack: Azure Cloud Services C# (.NET 10) Python React.js and modern JavaScript (ES6+) Snowflake (Data Warehouse) Apache Airflow Terraform dbt SQL Server ...

using TypeScript, leveraging frameworks such as Next.js or Vite. GenAI Frameworks: Familiarity with tools like LangChain, LangGraph, CrewAI, or Vercel AI (in Python or JavaScript). LLM experience: Practical experience with Large Language Models (LLMs) such as OpenAI, Anthropic, Mistral, or Llama, and tools like Ollama. Cloud Platforms: Proficiency ...

desirable. Hands-on experience in Playwright, Selenium Grid & WebDriver C#, SQL, Ruby, Specflow, and Cucumber. Experience in using AI technologies such as Co-Pilot. Javascript experience. Good exposure to SOAP, REST based APIs. Good exposure to DevOps/Test Plan APIs. Structured and disciplined with good interpersonal skills. Ability ...

typically candidates at this level have 5+ years of software engineering experience. You should be prepared to undertake our pair-programming interview stage in Javascript or Typescript, and you’ll be assessed as if this has been your primary language. This is a full-stack role — if you are only ...

Stack Developer within the Public Sector. Active SC and NPPV3 Clearance. Senior-level expertise in either Java/Spring (Boot, Data JPA, Security) or JavaScript/TypeScript with React; mid-level experience acceptable in the other Proven experience delivering high-quality, cross-functional solutions using microservices and micro-frontend architectures ...

both and to have a wider impact than either alone. Skills & Experience Required Strong software engineering background (Java, C#, or JavaScript/TypeScript) with experience building production systems in cloud environments. Deep experience with AWS or Azure and core cloud services (compute, networking, storage, IAM). Hands-on experience with ...