Full Stack JavaScript Developer - Contract

Summary: The role is for a Full Stack JavaScript Developer on a contract basis, focusing on a greenfield project for a SaaS start-up in the B2B retail sector. The position requires strong expertise in both frontend and backend technologies, with a collaborative approach to working closely with the CTO and product team. The contract is outside IR35 and offers a competitive daily rate. The developer will play a key role in building a new payments platform for the company's clients.

Key Responsibilities:

• Lead the development of a new payments platform as part of a greenfield project.
• Collaborate with the CTO and product team to design and implement new features.
• Develop and document scalable APIs and microservices.
• Integrate third-party services, particularly Stripe.
• Manage PostgreSQL databases and design relational data models.
• Enforce TypeScript standards and ensure code quality.
• Handle security, authentication, and role-based access at scale.
• Work independently and make architectural decisions as needed.
• Participate in Agile teams and communicate effectively with stakeholders.

Key Skills:

• 5+ years of full stack JavaScript experience, particularly with Vue and Node.
• Strong knowledge of API design and microservices architecture.
• Experience with Stripe and integrating third-party services.
• Proficient in managing PostgreSQL databases.
• Strong fundamentals in TypeScript.
• Familiarity with Docker, AWS, and CI/CD pipelines.
• Experience in security and authentication practices.
• Ability to work independently and make architectural decisions.
• Experience in Agile methodologies.

Salary (Rate): £525 per day

City: Manchester

Country: United Kingdom

Working Arrangements: hybrid

IR35 Status: outside IR35

Seniority Level: Mid-Level

Industry: IT

Detailed Description From Employer:

Full Stack JavaScript Developer - Contract

Manchester hybrid (3 days onsite per week)
Outside IR35 £450 - £525 per day
Contract Length: 6 months

I'm working with a SaaS start-up in the B2B retail space they've just closed Series A and are kicking off a new payments platform for their client base. They're building smart tools for retailers to manage suppliers, stock, and payments all in one place.

They need a strong full stack JavaScript contractor to help lead this greenfield build. You'll be working closely with the CTO and product team to bring the new feature to life.

The stack:

• Frontend: Vue3, TypeScript
• Backend: Node.js, PostgreSQL, Stripe API, GraphQL exposure, RESTful API design
• Infrastructure: Docker, AWS, CI/CD Pipelines

What they need from you:

• 5+ years of full stack JavaScript experience with strong commercial use of Vue and Node
• Ability to design, develop and document scalable APIs and microservices
• Comfortable integrating third-party services (Stripe experience essential)
• Experience managing PostgreSQL databases and designing relational data models
• Strong TypeScript fundamentals and ability to enforce typing and testing standards
• Familiar with containerised environments and deploying via AWS
• Confident in handling security, authentication and role-based access at scale
• Ability to work independently and make architectural decisions when needed
• Experience in Agile teams and communicating directly with product/CTO maintainable code

Why this one's worth a look:

• Fully greenfield project

• Direct influence over how it's built

• Outside IR35

• Clean, modern stack

• Fast feedback loop and minimal red tape