Job Summary
We are looking for a Founding Software Engineer to build a new SaaS platform for wholesale businesses covering inventory, purchasing, a B2B customer ordering portal, CRM and integrations with Xero, Shopify, Royal Mail and Amazon etc. You will be the first technical hire and will own the codebase. This is not a blank-page role: the architecture is designed and documented, a working database schema and tested pricing engine already exist, and a full product prototype has been validated with real wholesalers. Your job is to turn that foundation into a production system with paying customers, working directly with the founder and shaping the product as well as the code.
Duties
- Build the core platform in TypeScript: a NestJS API and Next.js front end, backed by PostgreSQL and Redis, structured as a modular monolith (deliberately not microservices).
- Implement the operational heart of the product: authentication and roles, product catalogue, sales orders with stock reservations, purchasing and goods receipt, and the pricing engine integration.
- Develop the B2B customer ordering portal with customer-specific pricing, live stock availability and credit control.
- Build the integration layer, starting with Xero, followed by Shopify, Royal Mail (Click & Drop) and Amazon SP-API etc.
- Design and evolve the PostgreSQL schema, including row-level security for tenant isolation and an append-only stock ledger. Comfort with transactions and locking matters here.
- Implement and document RESTful APIs (OpenAPI) used by both our own front ends and customer integrations.
- Own deployment and operations on AWS using managed services, with CI/CD through GitHub Actions and infrastructure as code.
- Write unit and integration tests as part of everyday work; integration tests run against a real Postgres database in CI.
- Work directly with the founder to turn product decisions into working software, and push back when you think something in the plan is wrong.
Experience
- Proven experience building and running production SaaS.
- Strong TypeScript across the stack: Node.js on the back end (NestJS preferred) and React on the front end (Next.js preferred).
- Genuine PostgreSQL depth: transactions, locking, indexing and ideally row-level security, not just ORM-level knowledge.
- Experience deploying and operating systems on AWS (or equivalent cloud) including monitoring, migrations and incident handling.
- Solid API design experience (REST/OpenAPI); experience integrating third-party platforms such as Xero, Shopify or Amazon is a strong plus.
- Experience with inventory, ordering, ERP or e-commerce systems is desirable but not essential.
- Familiarity with multi-tenant SaaS architecture is a strong advantage.
- A testing habit: you write tests because that is how you work, and you treat a green CI pipeline as the gate for shipping.
- Comfortable owning a codebase solo in an early-stage environment and managing your own priorities.
This role is a chance to build a product from the ground up without the usual blank-page risk: the groundwork is done, the market is real, and through our existing business we already have access to early customers.
To apply, send a CV and a short note about the most complex production system you have built and run, including what broke and what you would do differently. A link to code or a live product is worth more to us than a cover letter. No agencies, please.
Pay: £50,000.00-£65,000.00 per year
Benefits:
- Casual dress
- Employee stock ownership plan
- Free parking
- On-site parking
- Work from home
Work Location: Remote
