Founding Senior Full-Stack Engineer — Fintech/Blockchain

group-surge; Madrid; On-site; EUR 70,000 - 110,000; Full time

Job summary

Surge is building a global consumer-focused fintech platform powered by blockchain. We are seeking a Senior Full-Stack Engineer who can own features from end to end across backend, frontend, and mobile layers, collaborating closely with founders and design teams.

This founding-level role requires rapid delivery, strong product sense, and a willingness to relocate to Madrid or Miami. You will join a small, highly technical engineering group that values speed, quality, and ownership, contributing

Qualifications

• 5+ years of professional software engineering experience shipping production software.
• Strong full-stack capability across backend and frontend.
• Ability to learn and adopt new technologies quickly.
• Experience owning product features throughout the full development lifecycle.
• Willingness to relocate to Madrid or Miami and work on-site.

Responsibilities

• Own and deliver product features from end to end across the technology stack.
• Build backend services and APIs using Node.js and TypeScript.
• Contribute to frontend and mobile application development.
• Develop and maintain integrations with external services and blockchain infrastructure.
• Write clean, reliable, and scalable TypeScript.
• Work directly with founders, product, and design stakeholders.
• Move quickly from product concept to production release.
• Make pragmatic architectural decisions.
• Help establish engineering standards, development practices, and tooling.
• Contribute to product quality and polish across all customer touchpoints.
• Debug and resolve complex product and technical problems across multiple layers of the stack.

Skills

Full-stack engineering

Backend development

Frontend development

Node.js

TypeScript

Blockchain/crypto

Relocation to Madrid or Miami

Independently driven

Rapid delivery

Tools

React

React Native

AWS

Kubernetes

Terraform

Job description

Surge is building a global consumer-focused fintech platform powered by blockchain. We are seeking a Senior Full-Stack Engineer who can own features from end to end across backend, frontend, and mobile layers, collaborating closely with founders and design teams.

This founding-level role requires rapid delivery, strong product sense, and a willingness to relocate to Madrid or Miami. You will join a small, highly technical engineering group that values speed, quality, and ownership, contributing