Full Stack Developer

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.

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