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12 senior javascript engineer jobs found in London

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Outside Spy
Dec 01, 2025
Duration not stated
Senior JavaScript Engineer - Remote UK - Retail and E-commerce at Opus Recruitment Solutions, London, £400 to £600 per Day
£400 - £600 per day
Outside Spy Remote (London, UK)
Senior JavaScript Engineer - Remote UK - Retail and E-commerceWe are on the lookout for an experienced Senior JavaScript Engineer to join our client's growing team! Based remotely in the UK, you will need to have at least 5+ years of experience in JavaScript to be considered for this exciting role. As a JavaScript Engineer you will play a crucial role in developing the infrastructure and building new features on greenfield projects. We offer a Day Rate between 400-600 outside IR35 and the opportunity to work remotely from anywhere in the UK. If you are passionate about changing lives through technology and have relevant Retail and E-commerce experience we would love to hear from you.Apply now, as we are interviewing candidates as soon as possible and the application will close as soon as we find the right candidate!
Outside Spy
Dec 01, 2025
6 Months or more
Senior JavaScript Engineer - Remote UK - Retail and E-commerce at Opus Recruitment Solutions Ltd, London, 12 Months, £400-£600 per day
£400 - £600 per day
Outside Spy Remote (London, UK)
Senior JavaScript Engineer - Remote UK - Retail and E-commerce We are on the lookout for an experienced Senior JavaScript Engineer to join our client's growing team! Based remotely in the UK, you will need to have at least 5+ years of experience in JavaScript to be considered for this exciting role. As a JavaScript Engineer you will play a crucial role in developing the infrastructure and building new features on greenfield projects. We offer a Day Rate between 400-600 outside IR35 and the opportunity to work remotely from anywhere in the UK. If you are passionate about changing lives through technology and have relevant Retail and E-commerce experience we would love to hear from you. Apply now, as we are interviewing candidates ASAP and the application will close as soon as we find the right candidate!
Outside Spy
Dec 01, 2025
Duration not stated
Senior JavaScript Engineer - Remote UK - Retail and E-commerce at Opus Recruitment Solutions Ltd, London, £Contract Rate
Outside Spy Remote (London, UK)
Senior JavaScript Engineer - Remote UK - Retail and E-commerce We are on the lookout for an experienced Senior JavaScript Engineer to join our client 's growing team! Based remotely in the UK, you will need to have at least 5 + years of experience in JavaScript to be considered for this exciting role. As a JavaScript Engineer you will play a crucial role in developing the infrastructure and building new features on greenfield projects. We offer a Day Rate between 400-600 outside IR35 and the opportunity to work remotely from anywhere in the UK. If you are passionate about changing lives through technology and have relevant Retail and E-commerce experience we would love to hear from you. Apply now, as we are interviewing candidates as soon as possible and the application will close as soon as we find the right candidate!
Outside Spy
Nov 27, 2025
6 Months or more
Senior JavaScript Engineer (React/Node/React Native) - Contract at Ventula Consulting, London, 12 Months, £Contract Rate
Outside Spy London, UK
Leading eCommerce/travel client now requires a Full Stack JavaScript Developer with strong React, React Native and Node.js knowledge to assist in the development of their IOS and Android application, which experiences some of the highest traffic across Europe. This is a Full Stack role positioned in a mobile team with the use of React Native. Essential Technical Skills/Experience: React Native Full Stack JavaScript experience (Essential) GraphQL experience Experience in building mobile apps Experience with IOS and Android application development Front End skills (HTML5/CSS3/JavaScript/Ajax) Experience using code version control systems (GIT) Experience building responsive websites and applications Experience of integrating with web services and APIs, including REST endpoints In terms of office location, this role is based in Central London with 1 day per week in office and the rest working from home. This is a 12-month contract role which provides a...
Outside Spy
Nov 27, 2025
Duration not stated
Senior JavaScript Engineer (React/Node/React Native) - Contract at Ventula Consulting, London Area, £Contract Rate
Outside Spy London Area, United Kingdom
Leading eCommerce/travel client now requires a Full Stack JavaScript Developer with strong React, React Native and Node.js knowledge to assist in the development of their IOS and Android application, which experiences some of the highest traffic across Europe. This is a Full Stack role positioned in a mobile team with the use of React Native. Essential Technical Skills/Experience: React Native Full Stack JavaScript experience (Essential) GraphQL experience Experience in building mobile apps Experience with IOS and Android application development Front-end skills (HTML5 / CSS3 / JavaScript / Ajax) Experience using code version control systems (GIT) Experience building responsive websites and applications Experience of integrating with web services and APIs, including REST endpoints In terms of office location, this role is based in Central London with 1 day per week in office and the rest working from home. This is a 12-month contract role which...
Outside Spy
Nov 27, 2025
Duration not stated
Senior Software Engineer (React/Node/React Native) - Contract at Ventula Consulting, London Area, £575 per day
£575 per day
Outside Spy London Area, United Kingdom
Senior Software Engineer (React/Node/React Native) - Contract - £575 per day (Outside IR35) Leading Ecommerce client now requires a talented ‘Full Stack JavaScript Developer’ who is proficient in front/back-end and mobile development. (React/Node.js/React Native). This role will be joining their engineering team, developing new travel systems and requirements for our client’s web and mobile applications. What will a day in the role entail? Working as an integral part of an agile team contributing towards the planning and development of systems/platforms. Collaborating with engineers, product owners and business analysts to define solutions, ways of working and share knowledge across the department. Reviewing code and providing support to members of your team. Working on client-facing applications in react/next.js Designing and building Node.js/GraphQL APIs. The ideal Senior JavaScript Developer: Senior level experience in modern JavaScript, written with...
Outside Spy
Nov 27, 2025
Duration not stated
Senior Software Engineer (React/Node/Native) - Contract - £575 per day at Ventula Consulting Limited, North London, £550-£575 per day
£550 - £575 per day
Outside Spy London, UK
Senior Software Engineer (React/Node/React Native) - Contract - £575 per day (Outside IR35) Leading Ecommerce client now requires a talented ‘Full Stack JavaScript Developer’ who is proficient in front/back-end and mobile development. (React/Node.js/React Native). This role will be joining their engineering team, developing new travel systems and requirements for our client’s web and mobile applications. What will a day in the role entail? Working as an integral part of an agile team contributing towards the planning and development of systems/platforms. Collaborating with engineers, product owners and business analysts to define solutions, ways of working and share knowledge across the department. Reviewing code and providing support to members of your team. Working on client-facing applications in react/next.js Designing and building Node.js/GraphQL APIs. The ideal Senior JavaScript Developer: Senior level experience in modern JavaScript, written with...
Outside Spy
Nov 27, 2025
Duration not stated
Senior Software Engineer (React/Node/Native) - Contract - £575 per day at Ventula Consulting Limited, North London, £550-£575 per day
£550 - £575 per day
Outside Spy London, UK
Senior Software Engineer (React/Node/React Native) - Contract - £575 per day (Outside IR35) Leading Ecommerce client now requires a talented ‘Full Stack JavaScript Developer’ who is proficient in front/back-end and mobile development. (React/Node.js/React Native). This role will be joining their engineering team, developing new travel systems and requirements for our client’s web and mobile applications. What will a day in the role entail? Working as an integral part of an agile team contributing towards the planning and development of systems/platforms. Collaborating with engineers, product owners and business analysts to define solutions, ways of working and share knowledge across the department. Reviewing code and providing support to members of your team. Working on client-facing applications in react/next.js Designing and building Node.js/GraphQL APIs. The ideal Senior JavaScript Developer: Senior level experience in modern JavaScript, written with...
Outside Spy
Nov 27, 2025
6 Months or more
Senior Software Engineer (React/Node/React Native) - Contract - £575 per day (Outside IR35) at Ventula Consulting, London, 12 Months, £575 per day
£575 per day
Outside Spy London, UK
Senior Software Engineer (React/Node/React Native) - Contract - £575 per day (Outside IR35) Leading Ecommerce client now requires a talented Full Stack JavaScript Developer' who is proficient in front/Back End and mobile development. (React/Node.js/React Native). This role will be joining their engineering team, developing new travel systems and requirements for our client's web and mobile applications. What will a day in the role entail? Working as an integral part of an agile team contributing towards the planning and development of systems/platforms. Collaborating with engineers, product owners and business analysts to define solutions, ways of working and share knowledge across the department. Reviewing code and providing support to members of your team. Working on client-facing applications in react/next.js Designing and building Node.js/GraphQL APIs. The ideal Senior JavaScript Developer: Senior level experience in modern JavaScript, written with...
Outside Spy
Nov 27, 2025
Duration not stated
Contract Senior Software Engineer - eDV Cleared at Searchability NS &D, London, £Contract Rate
Outside Spy London, UK
CONTRACT SENIOR SOFTWARE ENGINEER - eDV CLEARED NEW CONTRACT JOB OPPORTUNITY AVAILABLE WITHIN A LEADING NATIONAL SECURITY COMPANY FOR A SENIOR SOFTWARE ENGINEER WITH eDV CLEARANCE Contract job opportunity for a Senior Software Engineer Globally leading defence / cyber security company £500 - £750 per day (inside and outside IR35 roles available) London based organisation in an easily accessible location Contract Senior Software Engineer To apply please call or email WHO WE ARE? We are recruiting multiple contract Senior Software Engineers to work with various clients in London ranging from R &D companies, Multi-National Consultancies to SME 's and product based companies. Due to the nature of the work these clients do, you must hold enhanced DV Security Clearance. WHAT WILL THE SENIOR SOFTWARE ENGINEER BE DOING? As a Senior Software Engineer, you will work with an experienced agile team to design and deliver...
Outside Spy
Dec 03, 2025
6 Months or more
Senior Tester/Test Automation - Banking Market Data - Outside IR35 - Hybrid at Pesaro Limited, London - Canary Wharf, 6 Months, £445 per day
£445 per day
Outside Spy London - Canary Wharf, UK
Senior Test Automation Engineer - Outside IR35 - Hybrid - Banking Market Data Senior Test Automation Engineer sought to lead testing activities for a new Market Data platform. Design and implement a test automation framework, execute both manual and automated tests, and take full ownership of quality assurance across the project. Transforming clients Market Data platform. Lead the design and implementation of automated test frameworks, ensuring top-notch quality assurance. Design and execute manual & automated tests for the new platform. Build and maintain a test automation framework for Market Data. Collaborate with IT and business teams to deliver efficient testing solutions. Report testing progress and results to leadership. Skills + Experience Proven experience in test automation (Playwright/Cypress). Strong Scripting skills (Python, JavaScript, etc.). Cloud & database knowledge (SQL). Banking/Market Data experience ISTQB...
Outside Spy
Nov 27, 2025
Duration not stated
Contract Solution Architect - eDV Cleared at Searchability NS &D, London, £Contract Rate
Outside Spy London, UK
Contract Solution Architect - Enhanced DV Cleared New contract opportunity in London for a Solution Architect with eDV Clearance to work across Operational, National Security projects New contract opportunity for a Solution Architect to work across National Security projects eDV Clearance required for high-side IT Access Daily rate up to £850 London based (hybrid - minimum 3 days on site per week) To apply, email: or call: About Join a leading consultancy delivering cutting-edge technology solutions across highly operational national security projects . We 're seeking an experienced Solution Architect to design and deliver secure, scalable, and innovative technical solutions across complex enterprise environments. You 'll collaborate with engineers, architects, and senior stakeholders to ensure solutions meet both business and technical objectives within some of the UK 's most critical programmes. Key Responsibilities...
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