Senior Software Engineer – FinTech DeFi, AI-Driven Growth

Fairmint Inc.; United States; On-site; USD 140,000 - 190,000; Full time

Job summary

Fairmint Inc. in the United States is seeking a Senior Software Engineer to build the infrastructure powering onchain equity.

You'll work at the intersection of fintech, AI-assisted development, and regulated DeFi, shipping secure, scalable software that bridges traditional and blockchain finance.

This high-impact role emphasizes fast delivery, intelligent coding, and collaboration with product, legal, and finance teams to ensure compliance and reliability.

Qualifications

• 5+ years of professional software development experience.
• Advanced skills in React, TypeScript, Node.js, and PostgreSQL.
• Experience with AWS Lambda + Amplify.
• Production fintech/regulatory experience.
• Familiarity with Solidity, DAML, or Bedrock is a plus (not required).
• Curiosity and comfort using AI-assisted tools daily to boost productivity and quality.
• Must be based on the US East Coast (NYC/CT/MA/NJ preferred) or France, with regular team meetups in NYC/CT.

Responsibilities

• Build and ship scalable features using React, TypeScript, Node.js, and PostgreSQL.
• Leverage AI tools (Cursor, MCP, AI agents) to accelerate development and power smarter product features.
• Design and optimize AWS cloud infrastructure (Lambda, Amplify, S3, API Gateway; Bedrock knowledge is a plus).
• Collaborate with product, legal, and finance teams to bridge onchain and traditional systems.
• Ensure security and regulatory compliance across deployed systems.
• Contribute to architecture decisions and mentor teammates on AI-assisted development best practices.

Skills

5+ years of experience

React

TypeScript

Node.js

PostgreSQL

AWS

Solidity

DAML

Bedrock

AI tools usage

Tools

Cursor

MCP

AI agents

Job description

Fairmint Inc. in the United States is seeking a Senior Software Engineer to build the infrastructure powering onchain equity.

You'll work at the intersection of fintech, AI-assisted development, and regulated DeFi, shipping secure, scalable software that bridges traditional and blockchain finance.

This high-impact role emphasizes fast delivery, intelligent coding, and collaboration with product, legal, and finance teams to ensure compliance and reliability.