Full Stack Engineer (Typescript / React)

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.