Full Stack JavaScript Developer - Contract

iO Associates; Manchester; Hybrid; GBP 80,000 - 100,000; Full time

Job summary

A SaaS start-up in the B2B retail space is seeking a Full Stack JavaScript Developer for a 6-month contract in Manchester. This role offers a clean, modern stack, allowing direct influence over the new payments platform's design and functionality while working in a fully greenfield environment.

Benefits

Fully greenfield project

Outside IR35

Fast feedback loop and minimal red tape

Qualifications

• 5+ years of full stack JavaScript experience.
• Strong commercial use of Vue and Node.
• Experience with Stripe integration.

Responsibilities

• Lead greenfield build of a new payments platform.
• Work closely with the CTO and product team.
• Design, develop and document scalable APIs.

Skills

Full Stack JavaScript

Vue

Node

TypeScript

PostgreSQL

API Development

docker

AWS

Tools

Docker

AWS

Job description

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