Senior Full-Stack Developer — Blockchain & Data

Merlin Digital Partner; United States; Hybrid; USD 58,000 - 63,000; Full time

Benefits offered by this job

Location: Barcelona

Salary Range: €50,000 – €55,000

Remote-Friendly

Core Team Impact & Career Plan

Job summary

Merlin Digital Partner is seeking a Senior Full Stack Developer to design and build end-to-end digital applications for a deep-tech client using an API-first approach. You will work across backend and frontend, with a focus on data architecture and scalable services.

You will develop REST/GraphQL APIs with Node.js, React/Next.js interfaces, manage data models in PostgreSQL/Supabase, containerize with Docker, and collaborate on UX decisions.

Qualifications

• 3–5 years of experience as a Full Stack Developer.
• Expertise in Node.js (Express / NestJS).
• Proficiency in React / Next.js or similar frameworks.
• Hands-on experience with PostgreSQL / Supabase.
• Solid knowledge of relational data modeling.
• Proven experience in API design.
• Familiarity with Git, cloud environments, and CI/CD workflows.

Responsibilities

• Design and build end-to-end digital applications with an API-first architecture.
• Develop high-performance interfaces using React / Next.js.
• Integrate APIs ensuring data consistency and efficiency.
• Define frontend patterns (state management, caching, SSR).
• Collaborate on product-oriented UX/UI decisions.
• Containerization and deployment with Docker in cloud environments.
• Document APIs and architectural decisions.

Skills

Node.js

React/Next.js

REST/GraphQL

PostgreSQL / Supabase

Data modeling

API design

CI/CD

Git & Cloud

Tools

Docker

Supabase

PostgreSQL

Git

Job description

Merlin Digital Partner is seeking a Senior Full Stack Developer to design and build end-to-end digital applications for a deep-tech client using an API-first approach. You will work across backend and frontend, with a focus on data architecture and scalable services.

You will develop REST/GraphQL APIs with Node.js, React/Next.js interfaces, manage data models in PostgreSQL/Supabase, containerize with Docker, and collaborate on UX decisions.