Founding Full-Stack Engineer — Remote, Own End-to-End

Proof 3fa, Inc.; California; Hybrid; USD 150,000 - 300,000; Full time

Benefits offered by this job

Premium healthcare

Job summary

3fa is an early-stage startup building consumer, enterprise, and infrastructure products. You will join a small team, owning features end-to-end across multiple verticals and collaborating with design on accessible, reliable products.

We seek 1–4 years of engineering experience, with shipped production software and strong frontend/backend fundamentals. Claude Code and Codex experience is a plus; DIDs and cryptography are preferred areas.

Qualifications

• 1–4 years of engineering experience with shipped production software.
• Strong frontend and backend fundamentals.
• Experience with TypeScript and React.

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.

Skills

Full-stack development

TypeScript

React

Frontend & Backend fundamentals

Tools

Claude Code

Codex

Job description

3fa is an early-stage startup building consumer, enterprise, and infrastructure products. You will join a small team, owning features end-to-end across multiple verticals and collaborating with design on accessible, reliable products.

We seek 1–4 years of engineering experience, with shipped production software and strong frontend/backend fundamentals. Claude Code and Codex experience is a plus; DIDs and cryptography are preferred areas.