Paena | YC W26
Founding Engineer – Paena | YC W26
Base Pay Range
$150,000.00/yr - $200,000.00/yr
Company Description Paena is building the first on chain earned wage access platform that connects decentralized liquidity to real workers living paycheck to paycheck. We provide instant cash advances with smart contract based repayment and yield subsidized fees that dramatically undercut legacy earned‑wage‑access incumbents.
Role Description You will lead core engineering and product development at the intersection of fintech infrastructure, DeFi protocols, and consumer systems. We use crypto for good. Your work will directly shape how capital flows from on chain markets to off chain users at scale.
What You Will Do
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 and 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
Ship fast, talk directly to users, and iterate based on real feedback
What We Are Looking For
3+ years of experience working as a software engineer at a fintech or web3 company or early‑stage startup, including experience shipping production systems
Completed a Bachelor’s degree in Computer Science, Engineering, or a related field, or graduating in December of this year
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
Compensation And Logistics
Build real financial infrastructure that materially improves people’s lives
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
Backed by top‑tier investors with long‑term conviction in the space
Seniority Level Mid‑Senior level
Employment Type Full‑time
Job Function Engineering and Information Technology
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$150,000.00/yr - $200,000.00/yr
Company Description Paena is building the first on chain earned wage access platform that connects decentralized liquidity to real workers living paycheck to paycheck. We provide instant cash advances with smart contract based repayment and yield subsidized fees that dramatically undercut legacy earned‑wage‑access incumbents.
Role Description You will lead core engineering and product development at the intersection of fintech infrastructure, DeFi protocols, and consumer systems. We use crypto for good. Your work will directly shape how capital flows from on chain markets to off chain users at scale.
What You Will Do
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 and 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
Ship fast, talk directly to users, and iterate based on real feedback
What We Are Looking For
3+ years of experience working as a software engineer at a fintech or web3 company or early‑stage startup, including experience shipping production systems
Completed a Bachelor’s degree in Computer Science, Engineering, or a related field, or graduating in December of this year
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
Compensation And Logistics
Build real financial infrastructure that materially improves people’s lives
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
Backed by top‑tier investors with long‑term conviction in the space
Seniority Level Mid‑Senior level
Employment Type Full‑time
Job Function Engineering and Information Technology
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