1,151 to 1,175 of 1,321 ECMAScript Jobs in London

is required and relevant for many entry level programming roles and help you get a step ahead. Learn the Command Line (*1.5 weeks) Learn Git & GitHub (*1.5 weeks) Learn JavaScript (*1.5 weeks) Learn Python 3 (*1.5 weeks) JavaScript forms the foundation of almost everything you see on the Internet. Therefore, this is an essential addition language in building your programming More ❯

is required and relevant for many entry level programming roles and help you get a step ahead. Learn the Command Line (*1.5 weeks) Learn Git & GitHub (*1.5 weeks) Learn JavaScript (*1.5 weeks) Learn Python 3 (*1.5 weeks) JavaScript forms the foundation of almost everything you see on the Internet. Therefore, this is an essential addition language in building your programming More ❯

in D365 Microsoft Dynamics 365 - Sales, Service, Field Service, Marketing Experience • Experience in Development/Configuration/solutions evaluation/Validation and deployment • Hands on experience writing plugins, workflows, JavaScript’s, dialogs etc. • Excellent Analytical and Communication skills • NET, C#, JavaScript experience a plus/• Working knowledge of CRM’s interoperability capability with MS Office, MS Office 365, SharePoint, Azure … and MS BI Stack • C#/VB.net, ADO.Net, XML, T/SQL, JQuery, JavaScript, Web Services, ASP.NET, and Silverlight skills • Experience in leading a Team • PowerApps Preferred • Planning and Prioritization skills • Experience in capturing requirements related to internal/external consulting, documenting, and mapping current business process • Experience in creating requirement specifications based on Architecture/Design/Detailing of More ❯

in D365 Microsoft Dynamics 365 - Sales, Service, Field Service, Marketing Experience • Experience in Development/Configuration/solutions evaluation/Validation and deployment • Hands on experience writing plugins, workflows, JavaScript’s, dialogs etc. • Excellent Analytical and Communication skills • NET, C#, JavaScript experience a plus/• Working knowledge of CRM’s interoperability capability with MS Office, MS Office 365, SharePoint, Azure … and MS BI Stack • C#/VB.net, ADO.Net, XML, T/SQL, JQuery, JavaScript, Web Services, ASP.NET, and Silverlight skills • Experience in leading a Team • PowerApps Preferred • Planning and Prioritization skills • Experience in capturing requirements related to internal/external consulting, documenting, and mapping current business process • Experience in creating requirement specifications based on Architecture/Design/Detailing of More ❯

in D365 Microsoft Dynamics 365 - Sales, Service, Field Service, Marketing Experience • Experience in Development/Configuration/solutions evaluation/Validation and deployment • Hands on experience writing plugins, workflows, JavaScript’s, dialogs etc. • Excellent Analytical and Communication skills • NET, C#, JavaScript experience a plus/• Working knowledge of CRM’s interoperability capability with MS Office, MS Office 365, SharePoint, Azure … and MS BI Stack • C#/VB.net, ADO.Net, XML, T/SQL, JQuery, JavaScript, Web Services, ASP.NET, and Silverlight skills • Experience in leading a Team • PowerApps Preferred • Planning and Prioritization skills • Experience in capturing requirements related to internal/external consulting, documenting, and mapping current business process • Experience in creating requirement specifications based on Architecture/Design/Detailing of More ❯

in D365 Microsoft Dynamics 365 - Sales, Service, Field Service, Marketing Experience • Experience in Development/Configuration/solutions evaluation/Validation and deployment • Hands on experience writing plugins, workflows, JavaScript’s, dialogs etc. • Excellent Analytical and Communication skills • NET, C#, JavaScript experience a plus/• Working knowledge of CRM’s interoperability capability with MS Office, MS Office 365, SharePoint, Azure … and MS BI Stack • C#/VB.net, ADO.Net, XML, T/SQL, JQuery, JavaScript, Web Services, ASP.NET, and Silverlight skills • Experience in leading a Team • PowerApps Preferred • Planning and Prioritization skills • Experience in capturing requirements related to internal/external consulting, documenting, and mapping current business process • Experience in creating requirement specifications based on Architecture/Design/Detailing of More ❯

Software Engineer - Salary: £80’000 plus bonus and benefits. NodeJS, JavaScript, TypeScript, Cloud Tech, CI/CD, AI, ML Harrington Starr has partnered with an innovative Technology SaaS Company that specialise in developing unique software systems for clients for across Property Management for both commercial and private consumer markets. This is an exciting opportunity to join a small team within … and are offering the opportunity for you to play a pivotal role within the full software development life cycle. We are looking for an experienced Software Engineer with NodeJS, JavaScript, TypeScript and including cloud technologies mainly AWS and Terraform. Strong experience with CI/CD. Key requirements within this opportunity are as follows: Experience with NodeJS Solid experience with JavaScript More ❯

Software Engineer - Salary: £80’000 plus bonus and benefits. NodeJS, JavaScript, TypeScript, Cloud Tech, CI/CD, AI, ML Harrington Starr has partnered with an innovative Technology SaaS Company that specialise in developing unique software systems for clients for across Property Management for both commercial and private consumer markets. This is an exciting opportunity to join a small team within … and are offering the opportunity for you to play a pivotal role within the full software development life cycle. We are looking for an experienced Software Engineer with NodeJS, JavaScript, TypeScript and including cloud technologies mainly AWS and Terraform. Strong experience with CI/CD. Key requirements within this opportunity are as follows: Experience with NodeJS Solid experience with JavaScript More ❯

Software Engineer - Salary: £80’000 plus bonus and benefits. NodeJS, JavaScript, TypeScript, Cloud Tech, CI/CD, AI, ML Harrington Starr has partnered with an innovative Technology SaaS Company that specialise in developing unique software systems for clients for across Property Management for both commercial and private consumer markets. This is an exciting opportunity to join a small team within … and are offering the opportunity for you to play a pivotal role within the full software development life cycle. We are looking for an experienced Software Engineer with NodeJS, JavaScript, TypeScript and including cloud technologies mainly AWS and Terraform. Strong experience with CI/CD. Key requirements within this opportunity are as follows: Experience with NodeJS Solid experience with JavaScript More ❯

Software Engineer - Salary: £80’000 plus bonus and benefits. NodeJS, JavaScript, TypeScript, Cloud Tech, CI/CD, AI, ML Harrington Starr has partnered with an innovative Technology SaaS Company that specialise in developing unique software systems for clients for across Property Management for both commercial and private consumer markets. This is an exciting opportunity to join a small team within … and are offering the opportunity for you to play a pivotal role within the full software development life cycle. We are looking for an experienced Software Engineer with NodeJS, JavaScript, TypeScript and including cloud technologies mainly AWS and Terraform. Strong experience with CI/CD. Key requirements within this opportunity are as follows: Experience with NodeJS Solid experience with JavaScript More ❯

Front-End Test Automation Engineer – Playwright/JavaScript/Finance Location: London Hybrid Type: Permanent We’re seeking a skilled Front-End Test Automation Engineer to join the QA team of a leading financial technology firm. The successful candidate will work closely with Full Stack Development and Operations teams to ensure high-quality, reliable releases across trading and market platforms. … This role is ideal for someone who thrives in a fast-paced, collaborative environment and has a passion for building robust test automation solutions in Playwright (JavaScript/TypeScript). Key Responsibilities: Design and implement automated test scripts and frameworks for front-end and API testing. Execute and monitor automated and manual test cases, analyse results, and report issues. Lead … automation experience using Playwright, Cypress, or Selenium. Expertise in UI testing (visual regression, responsive design, cross-browser). Strong API testing (REST/GraphQL) – automated and manual. Proficiency in JavaScript/TypeScript; Python experience is a plus. Solid understanding of Unix/Linux, SQL, and relational databases. Prior exposure to financial markets, ideally in Cash Equities. Strong analytical mindset, excellent More ❯

Front-End Test Automation Engineer – Playwright/JavaScript/Finance Location: London Hybrid Type: Permanent We’re seeking a skilled Front-End Test Automation Engineer to join the QA team of a leading financial technology firm. The successful candidate will work closely with Full Stack Development and Operations teams to ensure high-quality, reliable releases across trading and market platforms. … This role is ideal for someone who thrives in a fast-paced, collaborative environment and has a passion for building robust test automation solutions in Playwright (JavaScript/TypeScript). Key Responsibilities: Design and implement automated test scripts and frameworks for front-end and API testing. Execute and monitor automated and manual test cases, analyse results, and report issues. Lead … automation experience using Playwright, Cypress, or Selenium. Expertise in UI testing (visual regression, responsive design, cross-browser). Strong API testing (REST/GraphQL) – automated and manual. Proficiency in JavaScript/TypeScript; Python experience is a plus. Solid understanding of Unix/Linux, SQL, and relational databases. Prior exposure to financial markets, ideally in Cash Equities. Strong analytical mindset, excellent More ❯

Front-End Test Automation Engineer – Playwright/JavaScript/Finance Location: London Hybrid Type: Permanent We’re seeking a skilled Front-End Test Automation Engineer to join the QA team of a leading financial technology firm. The successful candidate will work closely with Full Stack Development and Operations teams to ensure high-quality, reliable releases across trading and market platforms. … This role is ideal for someone who thrives in a fast-paced, collaborative environment and has a passion for building robust test automation solutions in Playwright (JavaScript/TypeScript). Key Responsibilities: Design and implement automated test scripts and frameworks for front-end and API testing. Execute and monitor automated and manual test cases, analyse results, and report issues. Lead … automation experience using Playwright, Cypress, or Selenium. Expertise in UI testing (visual regression, responsive design, cross-browser). Strong API testing (REST/GraphQL) – automated and manual. Proficiency in JavaScript/TypeScript; Python experience is a plus. Solid understanding of Unix/Linux, SQL, and relational databases. Prior exposure to financial markets, ideally in Cash Equities. Strong analytical mindset, excellent More ❯

Front-End Test Automation Engineer – Playwright/JavaScript/Finance Location: London Hybrid Type: Permanent We’re seeking a skilled Front-End Test Automation Engineer to join the QA team of a leading financial technology firm. The successful candidate will work closely with Full Stack Development and Operations teams to ensure high-quality, reliable releases across trading and market platforms. … This role is ideal for someone who thrives in a fast-paced, collaborative environment and has a passion for building robust test automation solutions in Playwright (JavaScript/TypeScript). Key Responsibilities: Design and implement automated test scripts and frameworks for front-end and API testing. Execute and monitor automated and manual test cases, analyse results, and report issues. Lead … automation experience using Playwright, Cypress, or Selenium. Expertise in UI testing (visual regression, responsive design, cross-browser). Strong API testing (REST/GraphQL) – automated and manual. Proficiency in JavaScript/TypeScript; Python experience is a plus. Solid understanding of Unix/Linux, SQL, and relational databases. Prior exposure to financial markets, ideally in Cash Equities. Strong analytical mindset, excellent More ❯

SAP Fiori Developer Location: London/Newcastle/Glasgow Salary: £60,000 SAP - SAP ABAP - Fiori - U15 - JavaScript - HTML - CSS Clearance Eligibility: Sole British Nationals only (must have lived and worked in the UK for the past 5 consecutive years) Are you passionate about building intuitive, user-centric SAP solutions? We are supporting a growing technology organisation seeking an experienced … Strong commercial experience developing SAP Fiori/UI5 applications. Hands-on experience with SAP architecture and development best practices. Solid knowledge of ABAP and web technologies including UI5, HTML5, JavaScript, and CSS. Ability to explain technical concepts to both technical and non-technical audiences. Proactive, problem-solving mindset with a passion for ownership and delivery. Excellent communication and teamwork skills … years . Unfortunately, dual nationals cannot be considered at this time. SAP Fiori Developer Location: London/Newcastle/Glasgow Salary: £60,000 SAP - SAP ABAP - Fiori - U15 - JavaScript - HTML - CSS More ❯

are looking for an additional Senior WordPress engineer to join the team. The Role Maintain and develop new WordPress features Build and maintain plugins Work on maintain microservices and JavaScript elements of the stack which work alongside WordPress Prioritise your work load and lease with colleagues in other teams to ensure collaboration Ability to work within a fast paced environment … Requirements Extensive experience with WordPress Strong knowledge of Gutenberg and best practices Ability to create custom Gutenberg blocks Knowledge of PHP, HTML and CSS Front End development experience in JavaScript and React Knowledge of VCS and Git Ability to communicate your ways of working and collaborate with team members As a WordPress developer, this is a unique opportunity to join More ❯

are looking for an additional Senior WordPress engineer to join the team. The Role Maintain and develop new WordPress features Build and maintain plugins Work on maintain microservices and JavaScript elements of the stack which work alongside WordPress Prioritise your work load and lease with colleagues in other teams to ensure collaboration Ability to work within a fast paced environment … Requirements Extensive experience with WordPress Strong knowledge of Gutenberg and best practices Ability to create custom Gutenberg blocks Knowledge of PHP, HTML and CSS Front End development experience in JavaScript and React Knowledge of VCS and Git Ability to communicate your ways of working and collaborate with team members As a WordPress developer, this is a unique opportunity to join More ❯

ownership of and will see the business impact of. There's a focus on backend and API development although you'll also have elements of front end work with JavaScript and React.js. Location: You'll be based in plush City office on a fulltime basis, Monday to Friday. About you: You have expertise with C# .Net, ASP.Net development You have … a strong knowledge of databases (SQL or Oracle) You're comfortable with JavaScript/React You have a thorough knowledge of Computer Science fundamentals such as OOP, Design Patterns, Data Structures, Algorithms You are collaborative with excellent communication and stakeholder management skills You are degree educated in Computer Science or similar technical discipline What's in it for you: As More ❯

ownership of and will see the business impact of. There's a focus on backend and API development although you'll also have elements of front end work with JavaScript and React.js. Location: You'll be based in plush City office on a fulltime basis, Monday to Friday. About you: You have expertise with C# .Net, ASP.Net development You have … a strong knowledge of databases (SQL or Oracle) You're comfortable with JavaScript/React You have a thorough knowledge of Computer Science fundamentals such as OOP, Design Patterns, Data Structures, Algorithms You are collaborative with excellent communication and stakeholder management skills You are degree educated in Computer Science or similar technical discipline What's in it for you: As More ❯

Designing and refining complex front-end architectures for real-time data visualization Working in a culture where engineering excellence and code quality are non-negotiable Tech Stack: Languages: TypeScript, JavaScript (ES6+) Frameworks: React, Redux (or similar) Tooling: Webpack, Babel, Jest, ESLint, Git Bonus: Experience with WebSockets, performance profiling, or custom charting libraries (e.g., D3.js, Highcharts) What They’re Looking For … Strong experience with React and modern JavaScript/TypeScript Deep understanding of front-end architecture, performance tuning, and scalable component design Experience in fast-paced environments (finance, trading, gaming, or top-tier tech) Passion for clean, maintainable code and UI craftsmanship Why Join? Collaborate with some of the sharpest minds in trading and technology Contribute to software that drives real More ❯

Designing and refining complex front-end architectures for real-time data visualization Working in a culture where engineering excellence and code quality are non-negotiable Tech Stack: Languages: TypeScript, JavaScript (ES6+) Frameworks: React, Redux (or similar) Tooling: Webpack, Babel, Jest, ESLint, Git Bonus: Experience with WebSockets, performance profiling, or custom charting libraries (e.g., D3.js, Highcharts) What They’re Looking For … Strong experience with React and modern JavaScript/TypeScript Deep understanding of front-end architecture, performance tuning, and scalable component design Experience in fast-paced environments (finance, trading, gaming, or top-tier tech) Passion for clean, maintainable code and UI craftsmanship Why Join? Collaborate with some of the sharpest minds in trading and technology Contribute to software that drives real More ❯

Designing and refining complex front-end architectures for real-time data visualization Working in a culture where engineering excellence and code quality are non-negotiable Tech Stack: Languages: TypeScript, JavaScript (ES6+) Frameworks: React, Redux (or similar) Tooling: Webpack, Babel, Jest, ESLint, Git Bonus: Experience with WebSockets, performance profiling, or custom charting libraries (e.g., D3.js, Highcharts) What They’re Looking For … Strong experience with React and modern JavaScript/TypeScript Deep understanding of front-end architecture, performance tuning, and scalable component design Experience in fast-paced environments (finance, trading, gaming, or top-tier tech) Passion for clean, maintainable code and UI craftsmanship Why Join? Collaborate with some of the sharpest minds in trading and technology Contribute to software that drives real More ❯

Designing and refining complex front-end architectures for real-time data visualization Working in a culture where engineering excellence and code quality are non-negotiable Tech Stack: Languages: TypeScript, JavaScript (ES6+) Frameworks: React, Redux (or similar) Tooling: Webpack, Babel, Jest, ESLint, Git Bonus: Experience with WebSockets, performance profiling, or custom charting libraries (e.g., D3.js, Highcharts) What They’re Looking For … Strong experience with React and modern JavaScript/TypeScript Deep understanding of front-end architecture, performance tuning, and scalable component design Experience in fast-paced environments (finance, trading, gaming, or top-tier tech) Passion for clean, maintainable code and UI craftsmanship Why Join? Collaborate with some of the sharpest minds in trading and technology Contribute to software that drives real More ❯

Front End React Developer, React, Javascript, NW London to £80K A leading financial software company are looking for a Front End JavaScript developer who is proficient with React.js. The role is Offcie based in North West London, Your primary focus will be on developing user interface components and implementing them following well-known React.js workflows, specifically Redux and RTK. You … future use Translating designs and wireframes into high quality code Optimising components for maximum performance across a vast array of web-capable devices and browsers Skills Strong proficiency in JavaScript, including DOM manipulation and the JavaScript object model Experience developing with typescript Thorough understanding of React.js and its core principles Experience with Redux and RTK (RTKQuery also a bonus) Familiarity More ❯

AI Software Developer (Python, JavaScript, ML) - London/Hybrid Day rate: £500 - £800 (inside IR35) Duration: 6 - 12 months Start: ASAP Hybrid: 3 days on site per week My client is looking for a Software Developer with AI, Python and JavaScript experience to join on a contract basis. As a Software Developer - AI, you will focus on the development and … AI driven software solutions, working within a dynamic team to enhance our digital products. You will be responsible for writing clean, efficient, and maintainable code, primarily in Python and JavaScript, while contributing to the successful deployment of Gen AI technologies that directly impact the company's customer experience (CX) vision. You will collaborate closely with other software engineers, product teams … input on sprint planning, task estimation, and iterative improvements Requirements: 3+ years of experience in software development, with exposure to AI or machine learning projects. Proficient in Python and JavaScript, ideally with hands-on experience in building Gen AI proof of concepts or integrating LLM APIs. Familiarity with AI platforms such as OpenAI, Anthropic, or Databricks. Strong understanding of AI More ❯