Senior Fullstack Developer (React / Next to

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 Next.js 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, Next.js, Node.js, 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 Next.js

Work closely with designers, PMs, and engineers to deliver seamless user experiences

Contribute to backend development with Node.js (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 production release

Job Requirements

5+ years of professional web development experience

Deep expertise in React and Next.js (SSR, SSG, routing, performance tuning)

Strong in JavaScript / TypeScript

Hands‐on with Node.js (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 payment service provider, offering omnichannel and advanced payment solutions to businesses across Europe. We are innovative and fast‐growing, building powerful solutions that transform the way our clients do business. We focus on delivering real solutions to their challenges and always stay ahead of the curve. In short, we are a true FinTech. Join our dynamic team at our international office in beautiful Estepona, Málaga, and be a part of our journey towards global success.

We are not accepting applications or referrals from recruitment agencies for this position. Any unsolicited resumes will not be considered.

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