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.
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You like taking a feature from an idea or requirement all the way through to production.
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You are comfortable making architecture and technical decisions independently in a fast-moving environment.
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You care about building production-ready systems, not just getting code to work.
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You have strong TypeScript fundamentals and enjoy working with both React and Node.js.
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You naturally think about scalability, security, performance, and maintainability when building features.
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You enjoy solving complex problems across the browser, API, database, and infrastructure layers.
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You take ownership when something breaks and are comfortable digging into logs, metrics, and production evidence to find the root cause.
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You enjoy improving engineering workflows, code quality, testing, CI/CD, and development practices.
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You're excited by the opportunity to help build a product and technical foundation from an early stage.
Requirements
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6+ years of professional software engineering experience, with substantial ownership of production systems.
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3+ years of advanced TypeScript development across both frontend and backend.
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Strong understanding of TypeScript, including generics, discriminated unions, type narrowing, utility types, and strict compiler configuration.
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Advanced React experience, including component architecture, hooks, server state management, form performance, and reusable UI patterns.
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Experience building complex forms using React Hook Form or an equivalent library, with schema validation using Zod, Yup, or JSON Schema.
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Strong Node.js and NestJS experience, including dependency injection, modular architecture, validation, guards, interceptors, and exception handling.
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Strong understanding of REST API design, including resource modelling, pagination, filtering, versioning, idempotency, and consistent error handling.
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Strong PostgreSQL knowledge, including relational modelling, constraints, transactions, indexes, and query optimisation.
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Experience with Prisma ORM, including migrations and avoiding inefficient database query patterns.
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Experience securing web applications using JWT or OAuth 2.0, RBAC, secure cookies, token rotation, and OWASP practices.
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Experience writing automated tests using Jest and browser-level tests using Playwright.
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Production experience with Docker and CI/CD pipelines.
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Practical AWS experience across areas such as container deployment, managed databases, object storage, load balancing, IAM, configuration management, and observability.
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Strong Git skills and experience working through pull requests and technical code reviews.
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Ability to independently investigate and resolve issues across frontend, backend, database, and cloud infrastructure.
Bonus Points
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Experience with Nx or another JavaScript monorepo build system.
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Experience building multi-tenant SaaS products and implementing tenant-level data isolation.
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Experience with performance optimisation and observability for distributed applications.
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Experience working in a startup or 0→1 product environment.
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