Full Stack Engineer (Typescript / React)

Description

Summary: Seeking a Full Stack Developer with a strong backend focus to scale an e-commerce platform, improve core systems, and create internal products within a fast-growing healthtech company. Highlights: 1. Develop and maintain e-commerce core services and optimize payment providers 2. Build custom internal tools using React, Material UI, and React Query 3. Work within a microservices environment on a growing international platform **We are Merlin Digital Partner**, a leading consultancy specializing in IT and digital talent acquisition with over 10 years of experience. We have helped scale top companies such as **Wallapop, Glovo, Banc Sabadell, and Duracell**, among others. Focused on **humanizing and streamlining recruitment processes**, our goal is to transform companies by bringing in **top talent**. We stand out for **deeply understanding each partner’s reality**, not only their needs but also their essence. **Our partner** is a **fast\-growing healthtech company** founded in **Barcelona** and headquartered there, it has **expanded** **internationally** across **Europe and USA**. **The Mission:** **We are looking for a Full Stack Developer** with a strong backend focus to become part of our Growth Team. In this role, you’ll help scale our e\-commerce platform, improve core systems, and create internal products that support and accelerate our business operations. **The Role:** * E\-commerce \& Payments: Develop and maintain our ecommerce core services. Integrate and optimize payment providers like Stripe, Klarna, and Alma. * Internal tooling: Build custom internal CRM and "Offers" management tools from scratch using React, Material UI, and React Query. * Frontend evolution: Support and improve multiple frontends for treatment sales and our custom checkout flow. * System architecture: Work within a microservices environment, ensuring seamless communication between our ecommerce engine and internal systems. * Admin tools: Customize and extend internal admin panels to meet the specific needs of our growth and operations teams. **What we need:** * At least **5 years** of experience in software development. * Minimum of **2 years** of experience with **NestJS** (mandatory). * Strong proficiency in **TypeScript** across the entire stack. * Proven experience with **React**. * Solid understanding of PostgreSQL and microservices architecture. * Familiarity with security principles (CORS, OAuth, JWT). * Experience with **MedusaJS** or other headless ecommerce frameworks is a **strong plus**. * Prior background in **E\-commerce** (checkouts, payments, order management) is **highly valued**. **Tech Stack:** * **Backend:** Nest, TypeScript, MedusaJS (Self\-hosted). * **Frontend:** React, Material UI, Chakra UI (\+ Panda), TanStack. * **Infrastructure:** PostgreSQL, Microservices. **What we offer:** * Collaborative work environment and positive culture. * Free gym and classes. * Benefits and discounts in the company's products. * International and diverse teams. * 27 days off per year. * Flexibility in starting and ending your shift.