Senior Fullstack Developer

About this Role We're looking for a Founding Full Stack Engineer to help build and scale Valerie's multi-tenant platform for e-commerce brands. You'll work across the entire product stack — from React interfaces and TypeScript contracts to NestJS APIs, PostgreSQL, AWS, testing, and deployment. This is a hands-on engineering role where you'll own features from architecture and implementation through to production. You'll work closely with the Product and Engineering teams to turn evolving ideas into reliable, production-ready systems. You'll have significant ownership in how we build, test, deploy, and scale the platform, while also contributing to the development of Valerie's AI Agents and Brands & Investment Growth Platform. You could be a great fit if... You enjoy working across the full stack rather than being limited to frontend or backend. - You like taking a feature from an idea or requirement all the way through to production. - You are comfortable making architecture and technical decisions independently in a fast-moving environment. - You care about building production-ready systems, not just getting code to work. - You have strong TypeScript fundamentals and enjoy working with both React and Node.js. - You naturally think about scalability, security, performance, and maintainability when building features. - You enjoy solving complex problems across the browser, API, database, and infrastructure layers. - You take ownership when something breaks and are comfortable digging into logs, metrics, and production evidence to find the root cause. - You enjoy improving engineering workflows, code quality, testing, CI/CD, and development practices. - You're excited by the opportunity to help build a product and technical foundation from an early stage. Requirements - 6+ years of professional software engineering experience, with substantial ownership of production systems. - 3+ years of advanced TypeScript development across both frontend and backend. - Strong understanding of TypeScript, including generics, discriminated unions, type narrowing, utility types, and strict compiler configuration. - Advanced React experience, including component architecture, hooks, server state management, form performance, and reusable UI patterns. - Experience building complex forms using React Hook Form or an equivalent library, with schema validation using Zod, Yup, or JSON Schema. - Strong Node.js and NestJS experience, including dependency injection, modular architecture, validation, guards, interceptors, and exception handling. - Strong understanding of REST API design, including resource modelling, pagination, filtering, versioning, idempotency, and consistent error handling. - Strong PostgreSQL knowledge, including relational modelling, constraints, transactions, indexes, and query optimisation. - Experience with Prisma ORM, including migrations and avoiding inefficient database query patterns. - Experience…