Founding Full-Stack Engineer

3Jane is building the first scalable, capital-efficient credit-based money market on Ethereum. We extend realtime USDC credit lines—backed by on-chain proofs of credit scores (via CreditKarma/zkTLS), DeFi/CEX holdings and bank (via Plaid) assets—to yield farmers, traders, businesses and AI agents. By bringing credit creation onchain (no collateral, no banks), we unlock the second pillar of modern finance for crypto and set the stage for a multi-trillion-dollar credit economy native to Ethereum. This unlocks a three-dimensional collateral space within crypto financial markets by introducing future-backed loans alongside existing asset-backed loans.

We have just raised a $5.2 million seed round led by Paradigm and are assembling an AI-native engineering team where every developer owns an entire vertical and 10×es their output through structured AI workflows. You will be the backend engineer helping to architect the core protocol end-to-end and shaping how cryptonative credit is born.

What you’ll own

• Product UI & dashboards — Next.js/React (TS), component system (Radix/Tailwind), and polished data visibility for credit, portfolio, and risk views.
• On-chain app interactions — Wallet flows and full tx lifecycle (simulate/sign/send), contract reads/writes/events, optimistic/rollback states, multi-chain support.
• Data & subgraphs — Own GraphQL/The Graph usage and shape; tight queries, caching, and indexing to turn on-chain + partner data into fast, correct UI models.
• Convex backend slice — Schemas (users/balances/limits/loans), Convex functions/workers/cron, real-time subscriptions, webhooks, and minimal REST/GraphQL endpoints.
• Reliability & performance — Vitest coverage, CI hygiene, a11y, perf budgets, analytics/feature flags, and sensible security/privacy guardrails.

$150,000 - $200,000 a year

3Jane aims to bring the engine of credit creation fully on-chain, opening a multi-trillion-dollar market and reshaping DeFi’s future. We operate as an AI-native team where every member owns an entire vertical, makes the key calls, and sees their work directly on mainnet. Backed by Paradigm and offering meaningful token equity, the role comes with outsized impact and upside from day one.

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.