Senior/Lead Full-Stack Engineer (NestJS/React) - B2B SaaS Platform

About Us

We are a well-funded startup in the logistics-tech space, building a high-performance B2B platform from the ground up. Our goal is to replace outdated, manual workflows with a modern, scalable, and real-time application.

We are tackling complex business logic head-on. Our system is built on a sophisticated multi-tenant architecture to support complex organizational structures and advanced, permission-based workflows.

We have a clear, developer-focused "Smart Hardcoding" strategy for our MVP: we build the "right" scalable API-first foundation now, while "hardcoding" the UI for speed. We are looking for a true engineer to lay this foundation with us.

The Role: Founding Engineer

As the first core engineer, you will be responsible for building the entire technical foundation based on a detailed specification. This is an architecture-heavy role for a self-motivated builder.

• Build the core Modular Monolith backend using NestJS.
• Implement a complex, secure multi-tenant architecture (managing Users, Profiles, and Tenants).
• Implement our "Smart Hardcoded" RBAC (Permissions) system.
• Build a clean, API-First service (JSON only), knowing it will be consumed by both React (Web) and React Native (Mobile).
• Implement the core business logic: a complex load/offer management system, internal collaboration tools.
• Integrate core third-party services like Clerk (Auth) and Pusher (Real-time).

Our Tech Stack (Non-Negotiable)

• Backend: NestJS, Prisma, PostgreSQL
• Frontend: React (Vite), MUI, React Query, React Hook Form
• Mobile (v2.0): React Native (Expo)
• Language: TypeScript (Monorepo with shared-types)
• Auth: Clerk
• Real-time: Pusher

Who We're Looking For (Requirements)

• 5+ years of professional software engineering experience.
• Proven, hands-on experience building Multi-Tenant SaaS applications. (This is the most critical requirement).
• Expert-level knowledge of Node.js + TypeScript, preferably with NestJS.
• Strong expertise in React and its modern ecosystem (React Query is a must).
• Deep understanding of API-First design and Prisma (or similar modern ORMs).
• You understand the difference between a "quick-hack" MVP and a "scalable-foundation" MVP.
• You are autonomous, a strong problem-solver, and can own the entire stack.

Bonus Points (Nice to Have):

• Experience with React Native (Expo).
• Experience in the Logistics or B2B Marketplace domain.
• A strong understanding of database security and performance.

What We Offer

• The chance to be the #1 engineer and build a complex product from scratch.
• A fascinating architectural challenge (not just another CRUD app).
• A clear product vision and detailed technical specification (MDD) ready for development.
• Fully remote (Ukraine).
• Competitive compensation (we are open to hourly, part-time, or full-time engagement).

How to Apply Please send your CV, GitHub/LinkedIn, and a brief note explaining why this specific technical challenge (B2B, Multi-Tenancy, API-First) is interesting to you.