Contract JavaScript Jobs in London

1 to 25 of 88 Contract JavaScript Jobs in London

Senior Java Developer

London, United Kingdom
Ascendion
Agile methodologies and SDLC best practices. Strong problem-solving, analytical, and communication skills. Preferred: Experience in banking, payments, or financial services domain. Knowledge of front-end technologies (Angular, React, JavaScript) for full-stack exposure. Understanding of security protocols, authentication (OAuth2, JWT), and compliance requirements. More ❯
Employment Type: Permanent, Contract
Posted:

Full Stack Developer

London, South East, England, United Kingdom
Harnham - Data & Analytics Recruitment
security, accessibility, and testing across the codebase Support platform improvements and contribute to continuous delivery practices Skills & Experience Required Strong experience in full stack development using React , Next.js , and JavaScript/TypeScript Proven backend engineering skills using Node.js and/or modern languages like Python , Ruby , Scala , or Rust Solid understanding of API design and integration Track record of delivering More ❯
Employment Type: Contractor
Rate: £400 - £450 per day
Posted:

Software Developer

London, South East, England, United Kingdom
Hybrid / WFH Options
Oscar Technology
Provide senior-level support, troubleshooting, and performance monitoring with modern observability tools. Mentor and support junior engineers, collaborating with global teams. Required: Proven full-stack development expertise Node.js, TypeScript, JavaScript, and C#, .NET. Hands-on experience with cloud platforms (Azure preferred, AWS/GCP beneficial). Skilled in Kubernetes, Docker, Terraform, Helm, and CI/CD automation. Strong background in More ❯
Employment Type: Contractor
Rate: Salary negotiable
Posted:

Full Stack Developer

London, South East, England, United Kingdom
Hybrid / WFH Options
Robert Half
Robert Half Technology are assisting a market leading global technology consultancy to recruit a Full Stack Developer - Fully remote The Full Stack Developer will have experience across: React Python Javascript Nice to have: CI/CD Pipelines Github Actions Vue Java Azure Azure Devops Role The Full Stack Developer will adopt best practices like writing clean and reusable code using More ❯
Employment Type: Contractor
Rate: Salary negotiable
Posted:

FullStack Software Engineer

City of London, London, United Kingdom
Mentmore Recruitment
a real impact. Key Requirements: 3+ years in software engineering with a strong product mindset Experience working closely with product teams and designing for real users Strong frontend skills (JavaScript/Typescript, React/Angular, HTML) and backend expertise (Node.js, Python) Proven experience in API design and system integration Proficiency with Microsoft Azure and familiarity with databases, IAM, containers, and More ❯
Employment Type: Contract
Rate: £70000 - £80000/annum
Posted:

AI Engineer Front End

City of London, London, United Kingdom
Adecco
and architecture planning sessions. Required Knowledge, Skills & Experience Proven experience building secure, production-grade front-end applications in regulated environments (e.g., finance, healthcare, government). Strong proficiency in modern JavaScript/TypeScript frameworks (React, Next.js) and responsive UI development. Demonstrated ability to build front-end applications from scratch in greenfield or innovation lab settings. Experience developing interactive UIs, dashboards, chat More ❯
Employment Type: Contract
Posted:

AI Engineer Front End

London, South East, England, United Kingdom
Adecco
and architecture planning sessions. Required Knowledge, Skills & Experience Proven experience building secure, production-grade front-end applications in regulated environments (e.g., finance, healthcare, government). Strong proficiency in modern JavaScript/TypeScript frameworks (React, Next.js) and responsive UI development. Demonstrated ability to build front-end applications from scratch in greenfield or innovation lab settings. Experience developing interactive UIs, dashboards, chat More ❯
Employment Type: Contractor
Rate: Salary negotiable
Posted:

Contract Senior Software Engineer - eDV Cleared

London, South East, England, United Kingdom
Searchability NS&D
D, implementation to automation. WE NEED THE SENIOR SOFTWARE ENGINEER TO HAVE.... Current enhanced DV clearance Experience with at least one of the following: Java, Python, C++, C#, .NET, JavaScript, React Experience mentoring juniors or leading teams is nice to have but not essential Experience/Knowledge of automation IT WOULD BE NICE FOR THE SENIOR SOFTWARE ENGINEER TO HAVE.... More ❯
Employment Type: Contractor
Rate: £500 - £750 per day
Posted:

Outsystem Developer

London, United Kingdom
ARM
and understanding stakeholders on their request and work in an environment with some levels of governance Must have: Web applications expertise using modern web technologies (e.g. CSS, HTML, HTML5, JavaScript, jQuery). Knowledge in UX design principles and ability to apply them when building applications/solutions. Knowledge in database modelling and SQL programming (e.g. joins, count, group by, indexes More ❯
Employment Type: Contract
Rate: GBP 550 - 575 Daily
Posted:

Outsystem Developer

London, South East, England, United Kingdom
Advanced Resource Managers Limited
and understanding stakeholders on their request and work in an environment with some levels of governance Must have: Web applications expertise using modern web technologies (e.g. CSS, HTML, HTML5, JavaScript, jQuery). Knowledge in UX design principles and ability to apply them when building applications/solutions. Knowledge in database modelling and SQL programming (e.g. joins, count, group by, indexes More ❯
Employment Type: Contractor
Rate: £550 - £575 per day, Negotiable
Posted:

Outsystem Developer

City of London, London, Finsbury Square, United Kingdom
ARM
and understanding stakeholders on their request and work in an environment with some levels of governance Must have: Web applications expertise using modern web technologies (e.g. CSS, HTML, HTML5, JavaScript, jQuery). Knowledge in UX design principles and ability to apply them when building applications/solutions. Knowledge in database modelling and SQL programming (e.g. joins, count, group by, indexes More ❯
Employment Type: Contract
Rate: £550 - £575/day Negotiable
Posted:

Outsystems Developer

City of London, London, United Kingdom
ARM
to meet them Excellent problem-solving skills and the ability to independently perform root cause analysis. Must have: Web applications expertise using modern web technologies (e.g. CSS, HTML, HTML5, JavaScript, jQuery). Knowledge in UX design principles and ability to apply them when building applications/solutions. Knowledge in database modelling and SQL programming (e.g. joins, count, group by, indexes More ❯
Employment Type: Contract
Rate: £500/day Inside IR35
Posted:

Spotify Backstage Developer

London, South East, England, United Kingdom
Hybrid / WFH Options
Robert Half
documentation, and training for engineering teams adopting Backstage. Contribute to Backstage open-source ecosystem (where applicable). Profile The Spotify Backstage Developer will have strong experience in TypeScript/JavaScript (React knowledge highly desirable). Experience working with Spotify Backstage (building plugins, extending the framework). Familiarity with cloud environments (AWS, GCP, or Azure). Understanding of CI/CD More ❯
Employment Type: Contractor
Rate: Salary negotiable
Posted:

SC Cleared Salesforce Developer

City of London, London, United Kingdom
Hybrid / WFH Options
ARM
inc. defining invocable Flow actions and batch Apex) Salesforce Experience Cloud site-building experience Able to develop robust and advanced Salesforce Lightning Web Components (inc. familiarity with HTML, CSS, JavaScript) DevOps pipeline implementation and troubleshooting (inc. Python, Node.JS, Bash) AWS Services - including Lambda (Java), Secrets Manager, API Gateways Salesforce email configuration, including DNS/DKIM/SPF AI prompt building More ❯
Employment Type: Contract
Rate: £600 - £700/day Inside IR35 (Negotiable rate)
Posted:

React Developer

Bromley, Kent, England, United Kingdom
Pontoon
that's critical to global trading operations. What we're looking for: Strong programming skills in an OOP language (Java, Python, etc.). Solid hands-on experience with React, JavaScript, HTML, and CSS. Good understanding of algorithms, data structures, and design patterns. Experience with agile methodologies (Scrum, Kanban, XP) and CI/CD practices. Background in UI design, optimisation, scalability More ❯
Employment Type: Contractor
Rate: £750 - £850 per day
Posted:

React Developer (UI Components)

Bromley, London, United Kingdom
Pontoon
and Risk frontend application suite. Essential Skills & Qualifications: Proficient in an OOP language such as Java or Python. Strong experience with web technologies, tools, and frameworks, including HTML, CSS, JavaScript, and React. Familiarity with Agile development methodologies (XP, SCRUM, Kanban) and continuous integration practises. Previous experience in UI design, optimisation, and development processes. A solid degree in Computer Science, Physics More ❯
Employment Type: Contract
Posted:

React Developer UI Components

Bromley, Kent, England, United Kingdom
Pontoon
and Risk frontend application suite. Essential Skills & Qualifications: Proficient in an OOP language such as Java or Python. Strong experience with web technologies, tools, and frameworks, including HTML, CSS, JavaScript, and React. Familiarity with Agile development methodologies (XP, SCRUM, Kanban) and continuous integration practises. Previous experience in UI design, optimisation, and development processes. A solid degree in Computer Science, Physics More ❯
Employment Type: Contractor
Rate: Salary negotiable
Posted:

Senior Full Stack & AI Automation Engineer

London, United Kingdom
Salt
10+ years building operational support systems and automation in Python. Proven leadership in code reviews and mentoring. Hands-on experience with Selenium and iOS functional automation. Strong React/JavaScript UI development background. Back-end engineering with Python + Postgres. AI/ML expertise in LLMs, embeddings, and RAG systems. Experience with ETL pipelines, vector databases, and modern DevOps (Jenkins More ❯
Employment Type: Contract
Posted:

Senior Full Stack & AI Automation Engineer

London, South East, England, United Kingdom
Salt Search
10+ years building operational support systems and automation in Python. Proven leadership in code reviews and mentoring. Hands-on experience with Selenium and iOS functional automation. Strong React/JavaScript UI development background. Back-end engineering with Python + Postgres. AI/ML expertise in LLMs, embeddings, and RAG systems. Experience with ETL pipelines, vector databases, and modern DevOps (Jenkins More ❯
Employment Type: Contractor
Rate: Salary negotiable
Posted:

Content Processing Technical Consultant - Developed Vetting

City of London, London, United Kingdom
PS Computer Services Ltd t/a Parker Shaw
Required Skills & Experience: C#/java, .NET Core Containerisation (Docker, Kubernetes, OpenShift) xUnit Agile working practices CI/CD tooling Scripting experience (Python, Perl, Bash, etc.) ELK (Elastic stack) JavaScript Cypress Linux experience Search engine technology (e.g., Elasticsearch) Big Data Technology experience (Hadoop, Spar k , Kafka, etc.) Microservice and cloud native architecture Desirable: Able to demonstrate experience of troubleshooting and More ❯
Employment Type: Contract
Rate: Up to £700 per day inside IR35
Posted:

Microsoft Power Platform Developer

London, South East, England, United Kingdom
FDM Group
Microsoft Co-pilot Studio Experience with ALM Accelerator for Power Platform Excellent stakeholder management and relationship building skills Background in developing with C#, .NET, Web Services, Web Forms, MVC, JavaScript, jQuery, CSS, HTML, React, Web APIs and Visual Studio, API integrations Skilled in creating interface definitions Exposure to working with Agile development framework Experience with software design and development in More ❯
Employment Type: Contractor
Rate: £50,000 - £60,000 per annum
Posted:

Full Stack Developer - AI/Innovation

West London, London, England, United Kingdom
Adecco
clear evidence of active contribution to such projects. The role offers flexible working arrangements, with travel to the client's offices in Windsor twice a month Key skills include: JavaScript/TypeScript React Cloud-native development (AWS/Azure), CI/CD Ability to collaborate with designers to create user-friendly AI experiences Desirable Experience Experience in innovation teams, startups More ❯
Employment Type: Contractor
Rate: Salary negotiable
Posted:

Front Office React Developer

City of London, London, United Kingdom
Adecco
and Risk team to build and extend FX Options and Risk frontend application suite. Essential Skills: Very good knowledge and experience in Web Technologies, tools and frameworks, HTML, CSS, JavaScript and React. Knowledge or experience of agile development (e.g. XP, SCRUM, Kanban) and continuing integration. Experience in UI design, optimisation, scalability and reliability. Excellent problem solving and analytical skills in More ❯
Employment Type: Contract
Rate: £700 - £800/day
Posted:

Front Office React Developer

London, South East, England, United Kingdom
Adecco
and Risk team to build and extend FX Options and Risk frontend application suite. Essential Skills: Very good knowledge and experience in Web Technologies, tools and frameworks, HTML, CSS, JavaScript and React. Knowledge or experience of agile development (e.g. XP, SCRUM, Kanban) and continuing integration. Experience in UI design, optimisation, scalability and reliability. Excellent problem solving and analytical skills in More ❯
Employment Type: Contractor
Rate: £700 - £800 per day
Posted:

SDET - Playwright/TypeScript

London, South East, England, United Kingdom
Harvey Nash
testing for our web-based applications and trading platforms. What We're Looking For: Playwright Experience: Strong experience with Playwright for test automation, and familiarity with modern web technologies (JavaScript/TypeScript, HTML, CSS). SDET Expertise: Proficiency in writing automated tests for web and mobile applications, with a solid understanding of testing methodologies. Commodity Trading Knowledge: An understanding of More ❯
Employment Type: Contractor
Rate: £550 - £700 per day
Posted:
JavaScript
London
10th Percentile
£358
25th Percentile
£419
Median
£575
75th Percentile
£788
90th Percentile
£850