Founding Software Engineer (Full Stack)

3fa is an early-stage startup building consumer, enterprise, and infrastructure products for premium retail brands. The Founding Software Engineer will build products across these areas, owning features from definition through launch and improvement and developing interfaces, APIs, data systems, and commerce integrations.

Responsibilities:

• Own features from definition through launch and improvement
• Build interfaces, APIs, data systems, and commerce integrations with TypeScript and React
• Work with design to ship accessible, reliable products

Requirements:

• You bring 1–4 years of engineering experience, shipped production software, and strong frontend and backend fundamentals
• You have practical experience with Claude Code and Codex and a strong understanding of agentic engineering workflows and architectures
• Experience working with decentralized identifiers (DIDs), layer 2 blockchains, smart contracts, attestations, and general cryptography