Senior Full-Stack Engineer — FinTech/Web3 Platform

United States Digital Space LLC; United States; Remote; USD 140,000 - 200,000; Full time

Job summary

United States Digital Space LLC is seeking an experienced Full Stack Engineer to build production-ready features for a fintech-centric platform. You will design backend services in TypeScript/Node.js and develop fast, accessible React/Next.js frontends, while integrating with blockchain data sources and wallet infrastructure.

The role emphasizes autonomous ownership, rapid delivery, and strong architectural craft on a platform handling real financial flows.

Qualifications

• 4+ years of full-stack engineering experience.
• Strong in TypeScript, Node.js (NextJS or Express), and React/Next.js.
• Solid understanding of relational databases (PostgreSQL) and REST/GraphQL API design.
• Familiarity with Web3 tooling: ethers.js or viem, wallet connections, on-chain reads.
• Experience with event-driven architecture (Kafka, Pub/Sub, or similar).
• Bonus: prior fintech experience (payment rails, ledger systems, compliance infrastructure).
• Bonus: Solidity or Rust (even hobby-level) is a real differentiator.

Responsibilities

• Build and maintain full-stack features across our web app and API layer
• Design and implement backend services in TypeScript/Node.js with PostgreSQL
• Develop React/Next.js frontends that are fast, accessible, and production-grade
• Integrate with blockchain data sources, smart contracts, and wallet infrastructure
• Work closely with the PM and design on implementation feasibility and tradeoff decisions
• Write tests, participate in code reviews, and own your features end-to-end

Skills

Web3/DeFi depth

Autonomous working

Leadership

Tools

TypeScript

Node.js

React/Next.js

PostgreSQL

REST/GraphQL

ethers.js/viem

Kafka

AWS

Job description

United States Digital Space LLC is seeking an experienced Full Stack Engineer to build production-ready features for a fintech-centric platform. You will design backend services in TypeScript/Node.js and develop fast, accessible React/Next.js frontends, while integrating with blockchain data sources and wallet infrastructure.

The role emphasizes autonomous ownership, rapid delivery, and strong architectural craft on a platform handling real financial flows.