Software Engineer, Blockchain

About the role

About HIFI

HIFI is a stablecoin infrastructure company building technology for the next-generation of financial products. We build tools for payments and tokenized money products across money movement, cards, and capital markets. Institutions and enterprises already use our platform and APIs to move billions of dollars in production environments around the world, and we are still early.

Founded in 2022, our organization is flat and our team is talent dense. We work in person at our office in Flatiron and are intentional about who we work with. We've raised $37 million from world-class investors, including a Series A led by Left Lane Capital.

About the Team

HIFI's engineering team builds the payments infrastructure that fintechs and financial institutions use to move money on stablecoin rails. The team owns the APIs, ledger, and on-chain systems behind every payment HIFI processes, and works closely with product and compliance to make sure that infrastructure is reliable, secure, and ready for regulated use. As HIFI's volume grows and more institutions build on our platform, this team will decide how stablecoin payments hold up at the scale and standard that traditional financial infrastructure is held to.

As a Blockchain Engineer at HIFI you will help own on-chain systems day to day. You'll build and maintain the integrations, smart contracts, and wallet infrastructure that connect HIFI's payments products to the chains and stablecoins we support. This is a hands-on role with real ownership: you'll design how funds move and settle on-chain, work with the rest of engineering to connect those flows to our ledger and APIs, and partner with compliance on controls like wallet screening and transaction monitoring. You'll also be the person the team relies on to judge when a new chain or protocol is ready for production use.

What you will build

- Wallet infrastructure, including key management, transaction signing, and orchestration across custodial and programmatic wallets.

- Onchain transaction handling across EVM chains and the other networks we support, including gas, nonce management, and retries.

- Stablecoin minting, burning, and settlement logic that connects USDC and other stablecoins to fiat rails for our on-ramp and off-ramp products.

- Integrations with centralized and decentralized exchanges for swaps and liquidity routing, and cross-chain bridging between networks.

- A double-entry ledger that keeps onchain balances, banking partners, and customer accounts in sync, with automated reconciliation.

- Event listeners, confirmation tracking, and webhooks that give our platform and customers real-time visibility into onchain activity.

- Idempotent transaction pipelines with failure recovery and screening hooks, so money moves correctly even when something goes wrong.

You might be a fit if

- 3+ years of software engineering experience, including at least 1 to 2 years building blockchain systems in production.