Job Description
* Do you love building modern, high-performing applications end-to-end?
* Are you excited by the idea of working with a cutting-edge stack and contributing to both web and mobile products?
We're looking for a Senior Fullstack Engineer with deep expertise in React and to join our team
You'll be hands-on in designing and developing features across the stack — from sleek frontends to backend services and database architecture — while ensuring scalability, maintainability, and performance. If you also have React Native experience, that's a huge plus, as we maintain several mobile apps that would benefit from your skills.
Our current stack includes React,,, NestJS, PostgreSQL, and integrations with headless commerce platforms like MedusaJS.
What will you be doing?
* Design and implement high-quality, scalable frontend features with React and
* Work closely with designers, PMs, and engineers to deliver seamless user experiences
* Contribute to backend development with (ideally NestJS)
* Model and optimize databases with PostgreSQL (schemas, queries, migrations)
* Define system architecture, feature design, and data flow across the stack
* Integrate APIs and work with headless commerce platforms like MedusaJS
* Write clean, maintainable, and well-tested code
* Mentor and guide mid-level and junior developers
* Take ownership of features from concept through to production
Job requirements
* 5+ years of professional web development experience
* Deep expertise in React and (SSR, SSG, routing, performance tuning)
* Strong in JavaScript/TypeScript
* Hands-on with (NestJS a strong plus)
* Solid knowledge of PostgreSQL (schemas, queries, optimization)
* Experience with system design, feature architecture, and data flow modeling
* Comfortable with REST and/or GraphQL APIs
* Familiarity with eCommerce frameworks like MedusaJS (or Shopify Headless, Saleor)
* Strong problem-solving skills and ability to thrive in a fast-paced, collaborative environment
* Excellent communication skills in English
Nice To Haves
* Production experience with React Native
* Experience with headless commerce ecosystems
* Exposure to Docker, CI/CD pipelines, and AWS
* Contributions to open-source projects
What do we offer you?
* A competitive salary package
* Opportunities for professional growth
* A diverse role within a dedicated international team of enthusiastic colleagues
* Office with an amazing view of the beach
* Health insurance
* Free Spanish classes and afterwork sports activities
About MultiSafepay
MultiSafepay is a leading