ECMAScript Jobs in London

126 to 150 of 2,110 ECMAScript Jobs in London

Senior Full Stack Java Developer

London, England, United Kingdom
Hybrid / WFH Options
Version 1
experience. Experience in software engineering practices like Code Reviews, CI/CD Pipelines and SOLID/DRY principles. Hands-on developing/coding role using the following technologies: Frontend (JavaScript/TypeScript or Angular or React or Node). Backend (Java, SpringBoot, Hibernate, Kotlin). Experience in estimation and sizing. Integration experience. API Design experience. Cloud experience. Appetite to work More ❯
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Senior Software Engineer. Job in London Education & Training Jobs

London, England, United Kingdom
Hybrid / WFH Options
Twinkl Educational Publishing
development, particularly in large-scale, cloud-based systems with CI/CD practices. You bring deep expertise in modern frontend frameworks (especially React) and essential web technologies-HTML, CSS, JavaScript, TypeScript, and accessibility (a11y). You are experienced with automated testing and familiar with TDD. You've worked in product-centric teams that prioritise strong engineering principles like TDD and More ❯
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Cloud Software Engineer – Industrial Microgrid Control

London, England, United Kingdom
Hybrid / WFH Options
Power Technology Engineered Solutions Pty Ltd
systems Designing, developing, and executing industrial User Interfaces and Experiences (UI/UX) Software frameworks: Both .NET with C# for Windows Forms GUI developments; Blazor would be a plus. Javascript frameworks (React.JS, Node.JS or Angular.JS) for Web-GUI development Cloud front-end and back-end development, ideally with Amazon Web Service Databases Cloud-based architectures and applications Other software-tech More ❯
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Head of Engineering - Trading Systems

London, England, United Kingdom
Hybrid / WFH Options
Keyrock
Science, Engineering, or relevant field experience. Proven experience building and maintaining high-concurrency, high-performance, low-latency trading systems. Strong proficiency in development and architecture of Rust systems. Node.js (JavaScript/TypeScript) and Python are nice to have. Proficient in data-intensive systems. Proven experience with AWS, Docker Experience managing and leading engineering teams, with a focus on fostering collaboration More ❯
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Lead Front End Engineer(Agentic Intelligence)

London, England, United Kingdom
Group M Worldwide Inc
on our client ʼ s bottom line Great interpersonal skills; able to communicate at all levels of seniority and levels of technical understanding Influencing technical decisions in a project JavaScript without frameworks Attention to detail and producing pixel perfect implementation of designs A strong work ethic; able to work under pressure and juggle multiple responsibilities to meet deadlines and deliver More ❯
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Senior Clojure Developer

London, England, United Kingdom
Choreograph
systems. Experience with advertising technology (AdTech) highly desired. Proven experience and a passion for developing and operating full stack production systems in Clojure, k8s, and AWS or GCP. ClojureScript, JavaScript, TypeScript, React, Java, Python, and Terraform experience highly desirable. Proven experience leading teams, designing simple/scalable/reliable architectures, building, and operating concurrent, distributed systems, solving difficult and novel More ❯
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Principal Software Engineer - Technology Rates & FX

London, England, United Kingdom
TP ICAP
of financial/trading platforms and knowledge of financial markets Knowledge of FIX protocol and ability to handle FIX interactions In-depth knowledge of AWS services Experience with Java, JavaScript or React Experience with serverless architecture and microservices Experience with TDD, BDD or similar approaches Band & level : Manager, 7 Not The Perfect Fit? Concerned that you may not meet the More ❯
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Java Developer

London, England, United Kingdom
Handelsbanken
of SQL (DB2/SQL Server/Postgres preferred). Demonstrate excellent use of Design Patterns/Micro Services/RESTful APIs Basic capability in UI Development using advanced JavaScript (React and Node.js preferred) HTML, CSS Working in a Technical Agile environment (e.g. Build tools, Static/Dynamic code analysis, CI/CD e.g. Jenkins/TeamCity) Company Information Handelsbanken More ❯
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Software Engineer

London, England, United Kingdom
Hybrid / WFH Options
BAE Systems
organisation who makes a huge impact to the security of the UK. About you You will have experience in many of the following: Programming in one or more of JavaScript, Java, .Net, Python Collaboratively designing and building Proof of Concept or Production systems Source controlling your code with Version Control Systems, for example Git, Mercurial, Perforce Utilising CI/CD More ❯
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C# Fullstack React, Typescript, JavaScript - FX Options - Investment Banking

London, England, United Kingdom
Adlam Consulting Ltd
Yes Job Reference: e1fb70f7f4ed Job Views: 3 Posted: 29.06.2025 Expiry Date: 13.08.2025 Job Description: Posted by Senior Account Manager We are looking for a C# fullstack developer with Typescript, JavaScript, modern React, for the FX Options business of our client - pricing, booking and risk management - to work on a wide range of projects as they arise. This is a long … term role. Tech Stack Back: .NET, Windows Services, ASP .NET Web API, Kafka, gRPC, protobuf Front: JavaScript, TypeScript, React, HTML5, CSS/LESS/Sass, Tailwind CSS, NodeJS DevOps: GIT (Bitbucket), TeamCity Requirements include deep understanding and experience of Object-Oriented Programming, patterns, and principles, as well as .NET C#, service-oriented architectures, and DevOps tools. Ability to work independently … directly with a Front Office IT team. Key Contributions: As a member of the FX options team, you will participate in projects based on priorities, requiring expertise in Typescript, JavaScript, React, C#, microservices, refactoring, and clean code. Code reviews and SCRUM participation are part of the role. Candidates should have a passion for technology and enjoy collaborative work. This is More ❯
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Software Engineer (TypeScript, JavaScript, NodeJS)

London, England, United Kingdom
Hybrid / WFH Options
Compare the Market
turn, ensuring our solutions exceed expectations. Within this role you will be given the opportunity to work with lots of technologies, however, the core tech stack used will be JavaScript, TypeScript, and Node. Everyone is welcome. Be you. We have a culture of creativity. We approach our work passionately, improve constantly and celebrate our wins at every turn. We are More ❯
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Lead Application Software Developer

W1, Marylebone High Street, Greater London, United Kingdom
RedTech Recruitment Ltd
an industry-leading software company in London offering the opportunity to work on a wide variety of web application infrastructure projects. Using a diverse toolset with an emphasis on JavaScript, Node.js and related frameworks, this role is looking for a Developer to lead on the technical front, opposed to team leadership. This is well suited to a seasoned developer, who … + equity + comprehensive benefits Requirements for Lead Application Software Developer Several years of commercial experience within a Software Engineer/Developer role Experience with JavaScript and ideally, node.js and related technologies/frameworks Experience working for a company where SaaS has been implemented in commercial organisations This company values a history of academic excellence, so is looking for a … or 1st class honours degree from a leading university, plus AAB at A Level (or equivalent UCAS points) Ability to quickly pick up new technologies – working in JavaScript you’re aware new technologies/frameworks emerge all of the time, and you will need to stay abreast of the latest and best technologies to apply to any given project Any More ❯
Employment Type: Permanent
Salary: £80000 - £100000/annum Excellent Benefits
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PHP Full Stack Developer

London, England, United Kingdom
Hybrid / WFH Options
Purple Dot Digital Limited
applications using PHP and other web technologies. Create and manage backend services and ensure seamless data integration. Front-End Development: Develop user-friendly, responsive web interfaces using HTML, CSS, JavaScript, and front-end frameworks (e.g., React, Vue.js, Angular). Ensure cross-browser compatibility and mobile responsiveness. Database Management: Design and maintain databases (MySQL, PostgreSQL, or equivalent). Optimize database queries … Developer with a strong portfolio of web development projects. Technical Skills: Proficiency in PHP and related frameworks (e.g., Laravel, Symfony). Strong knowledge of front-end technologies (HTML, CSS, JavaScript, and modern JavaScript frameworks). Experience with database design and management (MySQL, PostgreSQL, or equivalent). Familiarity with version control systems (e.g., Git). Experience with RESTful API development and More ❯
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36101263 - Senior Software Engineer

London, England, United Kingdom
ZipRecruiter
on a huge project aimed at improving customer experience across the ECS product family which has opened a great opportunity for an experienced Senior Software Engineer with Full Stack JavaScript and C# .Net Core skills to join one of our agile teams in Nottingham. They are looking for someone who has good commercial experience writing code in React and C# … considerable experience in software engineering and experience building mission-critical, high-volume transaction web-based software systems. Experience/Skills: ? C# .NET Core and React development skills ? Experience with JavaScript, TypeScript ? Experience creating REST APIs ? Knowledge of microservice architecture ? Development and CI/CD tools such as Jira, Git and AWS CodeBuild ? Experience with a relational database such as MySQL More ❯
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Senior Software Developer

London, England, United Kingdom
MediSolution
applications are built using the best practices. Our Technology Stack Backend – Java REST APIs, Open Liberty Application Server, Apache Solr Search platform, RDBMS (Postgres, SqlServer, DB2) Frontend App Framework - JavaScript/TypeScript/React CI/CD - GitHub/CircleCI Cloud – AWS Requirements Bachelor's degree with a minimum of 2:1 Computer Science, Information Technology, or a related field. … and collaboration skills. Desirable Experience with text search engines like Elastic, Solr, and Lucene. Using Gradle for project automation and dependency management. Basic understanding of front-end technologies (e.g., JavaScript, TypeScript, and React) to facilitate smooth integration with backend services. #J-18808-Ljbffr More ❯
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Senior Software Engineer

Greater London, England, United Kingdom
Opus Recruitment Solutions
C# and LINQ, Experience of developing web services/RESTful APIs using ASP.NET, WinForms desirable, Source Control (Git) Miscellaneous Experience with RabbitMQ (or other messaging technologies). Web/JavaScript, Solid experience developing SPA applications with Angular, experience with HTML, CSS and JavaScript/Typescript Database SQL (MS SQL Server preferred) Experience of designing database tables/views, writing SQL More ❯
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Technical Lead - Full Stack

London, England, United Kingdom
Hybrid / WFH Options
Qih Group
best practices are followed. You are both a hands-on individual contributor and a technical leader, collaborating closely with teams to build scalable, efficient, and robust applications using modern JavaScript frameworks and tools. Key Responsibilities: Lead by example as a hands-on developer, contributing to both front-end and back-end codebases. Define architecture and system design for web applications … security, and performance. Provide technical guidance and mentorship to other engineers, ensuring code quality through reviews and best practices. Design and implement responsive, user-friendly web interfaces using modern JavaScript frameworks (Next.js, React). Collaborate with UX/UI designers to turn designs into functional, intuitive interfaces. Optimise front-end performance, ensuring smooth, fast, and reliable user experiences across devices. … About You: Expertise in JavaScript frameworks like React, Vue.js, or Angular, with proficiency in HTML, CSS, and responsive design principles. Strong experience with Node.js, Express.js, and building RESTful APIs or microservices. Proficiency in working with both SQL (PostgreSQL, MySQL) and NoSQL (MongoDB) databases. CI/CD & DevOps: Experience with integrating automated tests into CI/CD pipelines (e.g., Jenkins, CircleCI More ❯
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Software Engineer

City of London, London, United Kingdom
Vallum Associates
Excellent communication and teamwork skills. Bachelor’s degree in computer science, Engineering, or a related field, or equivalent work experience. Knowledge of front-end technologies like HTML, CSS, and JavaScript is a plus. More ❯
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Software Engineer

London Area, United Kingdom
Vallum Associates
Excellent communication and teamwork skills. Bachelor’s degree in computer science, Engineering, or a related field, or equivalent work experience. Knowledge of front-end technologies like HTML, CSS, and JavaScript is a plus. More ❯
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.NET Developer

City of London, London, England, United Kingdom
Hybrid / WFH Options
Noir
.NET Developer, .NET 9, C#, Azure, JavaScript, Agile - London (Tech stack: .NET Developer, .NET 9, ASP.NET, C#, React, Angular 19, Microservices, Vue.js, TypeScript, Azure, Web API 2, Agile, Azure SQL, Programmer, Full Stack Engineer, Architect, .NET Developer, Urgent)Be the first of your friends to declare, "I love where I work!" and actually mean it. Laugh hard and work hard … Developer candidates should have strong experience with: .NET, .NET Core/ASP.NET MVC, C# and Azure SQL. Our client will provide you with industry recognised training into: .NET 9, JavaScript, React, Angular 19, Microservices, MongoDB, Vue.js, TypeScript, Azure, AWS, Web API 2, Entity Framework, Node.js, Elasticsearch, Agile, TDD, BDD, Scrum, Kanban and MongoDB. Their benefits include the following: Bonus More ❯
Employment Type: Full-Time
Salary: £80,000 - £100,000 per annum
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.NET Developer

Greater London, England, United Kingdom
Hybrid / WFH Options
Noir
.NET Developer, .NET 9, C#, Azure, JavaScript, Agile - London (Tech stack: .NET Developer, .NET 9, ASP.NET, C#, React, Angular 19, Microservices, Vue.js, TypeScript, Azure, Web API 2, Agile, Azure SQL, Programmer, Full Stack Engineer, Architect, .NET Developer, Urgent) Be the first of your friends to declare, “I love where I work!” and actually mean it. Laugh hard and work hard … Developer candidates should have strong experience with: .NET, .NET Core/ASP.NET MVC, C# and Azure SQL. Our client will provide you with industry recognised training into: .NET 9, JavaScript, React, Angular 19, Microservices, MongoDB, Vue.js, TypeScript, Azure, AWS, Web API 2, Entity Framework, Node.js, Elasticsearch, Agile, TDD, BDD, Scrum, Kanban and MongoDB. Their benefits include the following: Bonus More ❯
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Solution Engineer

London, England, United Kingdom
C3 AI
degree in Science, Technology, Engineering or Mathematics (STEM), or comparable area of study Experience deploying enterprise scale applications Experience working in a customer-facing role Software development experience with JavaScript and Python Experience with Git or other version control software Experience working with JavaScript frameworks such as React, Redux, Vue, Backbone, or Angular Experience deploying software to at least one More ❯
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Web Engineer

London, England, United Kingdom
Hybrid / WFH Options
DEPOP
engineering guild sessions. Collaborate on a daily basis with fellow engineers in the cross functional environment to solve problems and write code. Mentor and coach your colleagues. Qualifications Solid JavaScript skills, including concepts like asynchronous programming, promises, closures, types, and ES6. HTML/CSS experience, including concepts like layout, specificity, cross browser compatibility, and accessibility. Experience in TypeScript, React and … Node.js. Building automated tests using Javascript test frameworks. Experience consuming RESTful API services. Comfortable in using Git. Experience working collaboratively as part of an agile team in a product-focused business. Nice to haves: Experience deploying web applications at scale. Experience writing RESTful API services, either in Javascript or Kotlin/Scala. Knowledge of Docker and Kubernetes. Experience with databases More ❯
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Software Developer - HSE - HEO

London, England, United Kingdom
Hybrid / WFH Options
Government Digital and Data
have experience in the following: Experience of full Agile Software Development life cycle as part of a team Experience of full-stack software development including C#/ASP .NET, JavaScript/TypeScript frameworks (such as Angular or React), SQL/NOSQL database development, and automated unit/integration testing Experience developing applications for cloud computing infrastructures such as Azure, AWS … Together Technical skills We'll assess you against these technical skills during the selection process: Technical architecture of a production system C# and Angular development skills Live code review Javascript development skills #J-18808-Ljbffr More ❯
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Backend Python Developer

London Area, United Kingdom
Hybrid / WFH Options
Roc Search
Job Title: Backend Python Developer Job Type: Permanent Location: London Salary: £55,000-£65,000 DOE Skills: Python, AWS, CI/CD, Docker Kubernetes, JavaScript Roc Search have partnered with a vibrant data focused agency in London. They are seeking an experienced Backend Engineer with a strong foundation in Python and object-oriented programming. In this role, you will be … practical experience). Proven experience as a Backend Engineer or a similar role, with a strong track record of designing and developing robust backend systems. Proficiency in Python and Javascript Familiarity with logging frameworks like Serilog for efficient log capturing and analysis. Experience with containerization tools like Docker and orchestration frameworks like Kubernetes. Knowledge of Helm and YAML for defining More ❯
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