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.