Senior Full-Stack Engineer (Node.js / TypeScript)

OnHires • Miami, FL

2d

About The Position

One of our clients is reimagining how money moves around the world. They're building a global fintech platform that combines the simplicity of a modern banking app with the power of blockchain technology—without exposing users to the complexity of crypto. The goal is simple: make sending, spending, and managing money across borders feel effortless. Already serving thousands of users in 130+ countries , the company is now accelerating growth after recently raising $5M in seed funding from leading US and European investors. This is an early-stage company with a lean, high-caliber engineering team where every line of code has a visible impact on the product.

Requirements

• 5+ years of professional software engineering experience.
• Strong full-stack development experience across backend and frontend.
• Deep expertise in JavaScript and TypeScript.
• Solid experience building production applications with Node.js.
• A product mindset and a passion for building high-quality user experiences.
• Comfortable thriving in a fast-moving startup environment with high ownership.

Nice To Haves

• React and/or React Native.
• AWS , Kubernetes, or Terraform.
• Consumer product or fintech experience.
• Blockchain, Web3, EVM, or Solidity experience (nice to have, not required).
• Early-stage startup experience.
• Experience helping establish engineering culture and technical standards.

Responsibilities

• Own and deliver features across the entire stack—from backend services to frontend experiences.
• Design and build scalable APIs and backend systems using Node.js and TypeScript.
• Collaborate closely with founders, product, and design to turn ideas into shipped features.
• Make architectural decisions that balance speed, scalability, and maintainability.
• Improve product quality, reliability, and user experience across the platform.
• Debug complex technical challenges across multiple layers of the stack.

Benefits

• Join as one of the company's first founding engineers
• Build a global product already used in 130+ countries
• Work directly with the founders and have a real voice in technical decisions
• Ship fast with minimal bureaucracy and see your work in production quickly
• Help shape the engineering culture, architecture, and future of the platform
• Own features from idea to launch—not just individual tasks
• Join a well-funded startup with $5M in seed funding and years of runway
• Make an outsized impact while the team is still small

What This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Education Level: No Education Listed