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Blockchain Engineer (Backend / Protocol-Focused) Location: New York preferred (Open to Remote for exceptional candidates) Employment Type: Full-time Industry: Fintech / Crypto Payments Infrastructure Role Overview: A crypto startup is hiring a Blockchain Engineer to help build and scale its core crypto and payments infrastructure. This role is focused on backend and blockchain systems, not consumer dApps or NFT projects. The ideal candidate has deep hands-on experience with blockchain protocols, strong backend engineering fundamentals, and comfort operating in a production, regulated fintech environment. We are hiring Blockchain Engineers with deep experience in at least ONE of the following ecosystems. Solana, Stellar (Soroban), or Ethereum Virtual Machine (EVM). Solana profile: You'll design, build, and maintain Solana programs and the backend services that integrate with them, while contributing to shared infrastructure across EVM, Solana, and Stellar. Our platform powers crypto-backed card products — processing high transaction volumes, continuously ingesting on-chain data, and navigating the unique complexity of each chain, with scalability and reliability engineered in from day one. What You'll Do: • Own and evolve Solana programs end-to-end — from development through deployment and maintenance • Build robust, scalable backend services that interact with Solana, EVM, and Stellar networks • Scale our on-chain infrastructure to support millions of users globally — powering transactions, data ingestion, and real-time processing • Play a central role in shaping the technical and product roadmap • Drive architectural decisions in a fast-moving, rapidly evolving product • Ship new capabilities quickly and iteratively to our customers What We're Looking For: • Deep expertise in the Solana ecosystem, including its programming model, tooling, and best practices • Strong proficiency in Rust • Solid understanding of smart contract security patterns and common vulnerability classes • Experience with Node.js and backend systems • 4+ years of engineering experience Stellar Profile: You'll design, build, and maintain Soroban smart contracts on Stellar and the backend services that integrate with them, while contributing to shared infrastructure across EVM, Solana, and Stellar. Our platform powers crypto-backed card products — processing high transaction volumes, continuously ingesting on-chain data, and navigating the unique complexity of each chain, with scalability and reliability engineered in from day one. What You'll Do: • Own and evolve Soroban smart contracts end-to-end — from development through deployment and maintenance • Build robust, scalable backend services that interact with Stellar, EVM, and Solana networks • Scale our on-chain infrastructure to support millions of users globally — powering transactions, data ingestion, and real-time processing • Play a central role in shaping the technical and product roadmap • Drive architectural decisions in a fast-moving, rapidly evolving product • Ship new capabilities quickly and iteratively to our customers What We're Looking For: • Deep expertise in the Stellar ecosystem, including Soroban's programming model, tooling, and best practices • Strong proficiency in Rust • Solid understanding of smart contract security patterns and common vulnerability classes • Experience with Node.js and backend systems • 4+ years of engineering experience; compensation will be calibrated accordingly Nice to Have: • Familiarity with Stellar classic operations EVM profile: You'll design, build, and maintain EVM smart contracts and the backend services that integrate with them, while contributing to shared infrastructure across EVM, Solana, and Stellar. Our platform powers crypto-backed card products — processing high transaction volumes, continuously ingesting on-chain data, and navigating the unique complexity of each chain, with scalability and reliability engineered in from day one. What You'll Do: • Own and evolve EVM smart contracts end-to-end — from development through deployment and maintenance • Build robust, scalable backend services that interact with EVM, Solana, and Stellar networks • Scale our on-chain infrastructure to support millions of users globally — powering transactions, data ingestion, and real-time processing • Play a central role in shaping the technical and product roadmap • Drive architectural decisions in a fast-moving, rapidly evolving product • Ship new capabilities quickly and iteratively to our customers What We're Looking For: • Deep expertise in the EVM ecosystem, including smart contract development, tooling, and best practices • Strong proficiency in Solidity • Experience with development frameworks such as Hardhat or Foundry • Solid understanding of smart contract security patterns, common vulnerability classes, and gas optimization • Experience with Node.js and backend systems • 4+ years of engineering experience; compensation will be calibrated accordingly Nice to Have: • Experience deploying across multiple EVM-compatible chains (Ethereum, Arbitrum, Base, Polygon, etc.) • Familiarity with upgradeable contract patterns and proxy architectures Work Location: Remote