Paena is looking to solve the problem of providing instant cash advances with smart contract based repayment and yield subsidized fees to workers living paycheck to paycheck
Requirements
- Extremely strong familiarity with modern web and backend stacks including TypeScript, React, React Native, Node.js, and relational databases
- Strong familiarity with Solidity and EVM based smart contracts, or a demonstrated ability to ramp up extremely quickly and ship audited on chain code
- Familiarity with DeFi primitives and protocols such as ERC 4626 vaults, Aave v3 or similar money markets, and stablecoin based systems
- Experience integrating payments and financial infrastructure such as ACH debit, bank account linking, or transaction reconciliation
- Proven experience designing and shipping systems within structured engineering organizations, including system design, code review, testing practices, and production operations
- Ability to lead technical execution, set engineering standards, and mentor or manage other engineers as the team grows
- 3+ years of experience working as a software engineer at a fintech or web3 company or early stage startup, including experience shipping production systems
Responsibilities
- Build the core worker experience for requesting and repaying cash advances using React Native, TypeScript, and modern mobile tooling
- Design, implement, and audit Solidity smart contracts for earned wage access, including ERC 4626 style liquidity vaults, repayment logic, fee routing, and credit limits
- Integrate and build on top of DeFi protocols such as Morpho, Aave v3 with forward looking support for Aave v4
- Architect backend systems in TypeScript or Python using Node.js frameworks, relational databases, and event driven job queues
- Implement ACH debit and bank payment flows, reconciliation, and failure handling across off chain and on chain systems
- Build smart wallet infrastructure using embedded wallet and key management systems such as Privy or Turnkey
- Design secure transaction orchestration across wallets, payment rails, and smart contracts
Other
- Completed a Bachelor’s degree in Computer Science, Engineering, or a related field, or graduating in December of this year
- Ability to lead technical execution, set engineering standards, and mentor or manage other engineers as the team grows
- Work on one of the rare YC crypto companies focused on real world users and cash flow
- Own large technical surface area from protocol design to user impact
- Competitive compensation, meaningful equity, and high autonomy
