14 contract full stack javascript developer jobs found

🚀 Contract Full-Stack JavaScript Developer (AI Platform) 📍 Location: 3 days per week in London Office 📆 Duration: 4 weeks with a longer term extension afterwards. 💼 IR35 Status: Outside IR35 💰 Rate: £500p/d – £600p/d Opus is partnering with a cutting-edge FinTech start-up to secure a Contract Full-Stack JavaScript Developer . You’ll be joining a small, high-calibre team building a platform to improve workflows within the the FinTech space. They have a genuinely interesting problem at the intersection of frontend engineering, backend systems, and applied LLM tooling . This is a true 0–1 build , ideal if you enjoy ownership, clean abstractions, and shipping product quickly. 🧠 What You’ll Be Working On Building and extending agent-driven workflows. Developing context management and LLM entry points. Only application-layer LLM integrations, not model training) Expanding slide generation functions and data structures. Full-stack feature...

🚀  Contract Full-Stack JavaScript Developer (AI Platform) 📍  Location:  3 days per week in London Office 📆  Duration:  4 weeks with a longer term extension afterwards. 💼  IR35 Status:  Outside IR35 💰  Rate:  £500p/d – £600p/d Opus is partnering with a cutting-edge  FinTech start-up  to secure a  Contract Full-Stack JavaScript Developer . You’ll be joining a small, high-calibre team building a platform to improve workflows within the the FinTech space. They have a genuinely interesting problem at the intersection of  frontend engineering, backend systems, and applied LLM tooling . This is a  true 0–1 build , ideal if you enjoy ownership, clean abstractions, and shipping product quickly. 🧠 What You’ll Be Working On Building and extending  agent-driven workflows. Developing  context management and LLM entry points.  Only application-layer LLM integrations, not model training) Expanding  slide generation functions and data structures. Full-stack feature development, with a...

Contract Full-Stack JavaScript Developer (AI Platform) Location: 3 days per week in London Office Duration: 4 weeks with a longer term extension afterwards. IR35 Status: Outside IR35 Rate: £500p/d - £600p/d Opus is partnering with a cutting-edge FinTech start-up to secure a Contract Full-Stack JavaScript Developer . You'll be joining a small, high-calibre team building a platform to improve workflows within the FinTech space. They have a genuinely interesting problem at the intersection of Front End engineering, Back End systems, and applied LLM tooling . This is a true 0-1 build , ideal if you enjoy ownership, clean abstractions, and shipping product quickly. What You'll Be Working On Building and extending agent-driven workflows. Developing context management and LLM entry points. Only application-layer LLM integrations, not model training) Expanding slide generation functions and data structures. Full-stack feature development, with a Front...

Contract Full-Stack JavaScript Developer (AI Platform) Location: 3 days per week in London Office Duration: 4 weeks with a longer term extension afterwards. IR35 Status: Outside IR35 Rate: £500p/d - £600p/d Opus is partnering with a cutting-edge FinTech start-up to secure a Contract Full-Stack JavaScript Developer . You'll be joining a small, high-calibre team building a platform to improve workflows within the the FinTech space. They have a genuinely interesting problem at the intersection of frontend engineering, backend systems, and applied LLM tooling . This is a true 0 -1 build , ideal if you enjoy ownership, clean abstractions, and shipping product quickly. What You'll Be Working On Building and extending agent-driven workflows. Developing context management and LLM entry points. Only application-layer LLM integrations, not model training) Expanding slide generation functions and data structures....

🚀 Contract Full-Stack JavaScript Developer 📍 Location: Fully Remote 📆 Duration: 6 Months 💼 IR35 Status: Outside IR35 💰 Rate: £500p/d - £600p/d Opus is partnering with a FinTech start-up to secure a Contract Full-Stack JavaScript Developer. You will be working in a small team to build the product from 0-1. If you're passionate about clean code, scalable architecture, and modern tooling. 🛠️ Tech Stack React.js Next.js Node.js TypeScript AWS Terraform 📩 Interested? Apply now or send your latest CV to matthew.carter@opusrs.com ASAP! If you haven’t heard back within 48 hours, please assume your application was not successful this time.

Senior Full Stack Developer TypeScript, React, Node.js Contract 3 months initially Edinburgh (Hybrid) Rate: £400 - £450 a day Outside IR35 We're working with a well-established technology business to find a Senior Full Stack Developer for an immediate contract engagement click apply for full job details

JavaScript Developer, React focused, Product Engineer (Contract) | React, TypeScript, Node.js, AWS | Product-Led Delivery | £400-450/day | Outside IR35 | Fully Remote (UK) | 6-Month Contract We’re hiring multiple Senior Product Engineers (contractors) with strong frontend or full-stack capabilities to join a large-scale public sector transformation programme. This role focuses on building modern, user-centric digital products as part of cross-functional teams spanning product, design, and engineering. You’ll be working on high-impact platforms, delivering intuitive, scalable web applications used by a wide range of users. This is a 6-month initial contract, ideal for engineers who combine strong frontend expertise with product thinking and a pragmatic approach to delivery. The Role | JavaScript Developer, React focused, Product Engineer (Contract) | React, TypeScript, Node.js, AWS | Product-Led Delivery | £400-450/day | Outside IR35 | Fully Remote (UK) |...

Dynamics 365 CRM & Business Central Developer | £450 - £500 We're working with a rapidly expanding UK IT Managed Services Provider that is heavily investing in the automation of their internal ecosystem on this exciting opportunity. This is a high-impact contract role where you will bridge the gap between CRM and Business Central to drive operational excellence. As a key technical figure, you will be responsible for re-engineering the internal Dynamics environment, ensuring seamless workflows and robust data flow across the business. You’ll leverage the full Power Platform stack to turn a core platform into a powerful automation engine. The Role Lead the stabilization and technical improvement of the Dynamics 365 CRM platform to support business growth. Design and deliver complex integrations between Dynamics 365 Sales/Service and Dynamics 365 Business Central. Build and deploy advanced automations using Power Automate to streamline the end-to-end customer...

JavaScript Developer, React focused, Product Engineer (Contract) | React, TypeScript, Node.js, AWS | Product-Led Delivery | £400-450/day | Outside IR35 | Fully Remote (UK) | 6-Month Contract We’re hiring multiple Senior Product Engineers (contractors) with strong frontend or full-stack capabilities to join a large-scale public sector transformation programme. This role focuses on building modern, user-centric digital products as part of cross-functional teams spanning product, design, and engineering. You’ll be working on high-impact platforms, delivering intuitive, scalable web applications used by a wide range of users. This is a 6-month initial contract, ideal for engineers who combine strong frontend expertise with product thinking and a pragmatic approach to delivery. The Role | JavaScript Developer, React focused, Product Engineer (Contract) | React, TypeScript, Node.js, AWS | Product-Led Delivery | £400-450/day | Outside IR35 | Fully Remote (UK) |...

I am currently working with an exciting AI focused business who are looking for a Full Stack Developer to join their UK team. Role: Full Stack Developer Location: Fully Remote (UK) Contract: 12 Months Day Rate: £500 – £600 per day IR35 Status: Outside IR35 Key Responsibilities Develop and manage applications end-to-end, from design through to deployment Work closely with product and design teams to translate Figma/Sketch designs into production-ready applications Build and maintain scalable microservices-based systems Contribute to system architecture and scalability planning Support integration with third-party systems and services Participate in deployment and infrastructure design Technical Requirements Frontend React.js JavaScript / TypeScript (strong preference for TypeScript) Backend Python or NestJS Strong backend engineering capability (preferred focus) If keen please apply!

JavaScript Developer, React focused, Product Engineer (Contract) | React, TypeScript, Node.js, AWS | Product-Led Delivery | £400-450/day | Outside IR35 | Fully Remote (UK) | 6-Month Contract We’re hiring multiple Senior Product Engineers (contractors) with strong frontend or full-stack capabilities to join a large-scale public sector transformation programme. This role focuses on building modern, user-centric digital products as part of cross-functional teams spanning product, design, and engineering. You’ll be working on high-impact platforms, delivering intuitive, scalable web applications used by a wide range of users. This is a 6-month initial contract, ideal for engineers who combine strong frontend expertise with product thinking and a pragmatic approach to delivery. The Role | JavaScript Developer, React focused, Product Engineer (Contract) | React, TypeScript, Node.js, AWS | Product-Led Delivery | £400-450/day | Outside IR35 | Fully Remote (UK) |...

JavaScript Developer, React focused, Product Engineer (Contract) | React, TypeScript, Node.js, AWS | Product-Led Delivery | £400-450/day | Outside IR35 | Fully Remote (UK) | 6-Month Contract We’re hiring multiple Senior Product Engineers (contractors) with strong frontend or full-stack capabilities to join a large-scale public sector transformation programme. This role focuses on building modern, user-centric digital products as part of cross-functional teams spanning product, design, and engineering. You’ll be working on high-impact platforms, delivering intuitive, scalable web applications used by a wide range of users. This is a 6-month initial contract, ideal for engineers who combine strong frontend expertise with product thinking and a pragmatic approach to delivery. The Role | JavaScript Developer, React focused, Product Engineer (Contract) | React, TypeScript, Node.js, AWS | Product-Led Delivery | £400-450/day | Outside IR35 | Fully Remote (UK) |...

Location: Reading - 1 day per week onsite (rest remote) Contract: 3-6 months initially with the view to extend Rate: £550 per day (Outside IR35) We are seeking a Full Stack Developer to support a telecommunications client, working across modern Front End and Back End technologies to deliver high-quality, scalable solutions. You will take ownership of requirements from brief through to delivery, producing well-structured code while collaborating with the wider development team. Essential Skills Strong experience with React and JavaScript/TypeScript in production environments. Solid Back End development experience using Python . Experience building and working with REST APIs (FastAPI preferred). Strong understanding of software engineering principles, design, and architecture . Experience delivering AI solutions . Ability to work independently from a brief while contributing to a team environment. Strong communication and collaboration...

Dynamics 365 CRM & Business Central Developer | £450 - £500 We're working with a rapidly expanding UK IT Managed Services Provider that is heavily investing in the automation of their internal ecosystem on this exciting opportunity. This is a high-impact contract role where you will bridge the gap between CRM and Business Central to drive operational excellence. As a key technical figure, you will be responsible for re-engineering the internal Dynamics environment, ensuring seamless workflows and robust data flow across the business. You’ll leverage the full Power Platform stack to turn a core platform into a powerful automation engine. The Role Lead the stabilization and technical improvement of the Dynamics 365 CRM platform to support business growth. Design and deliver complex integrations between Dynamics 365 Sales/Service and Dynamics 365 Business Central. Build and deploy advanced automations using Power Automate to streamline the end-to-end customer...