Job Description

About the Company HIFI is redefining how money moves. We’re building the logic layer for modern finance — APIs and workflows that let developers automate, compose, and orchestrate payments across stablecoin and fiat rails for a faster, more programmable financial world. About the Role We’re looking for software engineers excited about Web3 and blockchain technologies who can adapt quickly, collaborate effectively, and combine technical depth with creativity to solve complex problems. Whether you’re designing smart contract integrations, optimizing transaction flows, building APIs for on‑chain/off‑chain interoperability, or scaling systems that support mission‑critical money movement, your work will directly shape the backbone of HIFI’s platform. At HIFI, engineers own their work end-to-end: from design discussions and product input to building, shipping, and scaling systems in production. Values Find large challenges exciting and enjoy discovering and defining problems as much as solving them Deliver — you may enjoy thoughtful conversations and perfecting designs, but in the end, you care about building reliable solutions that ship Communicate clearly and comfortably across teams, asking questions, sharing ideas, and speaking up Learn quickly, stay curious, and adapt to new challenges with a growth mindset Move fast and stay effective in ambiguous, evolving environments, with a strong sense of urgency to get things done Give and receive feedback openly, and collaborate across functions Bring passion and experience — for Web3, modern payment solutions, or anything else — and channel it into their work Responsibilities Smart Contract & Protocol Integrations: Design, implement, and maintain integrations with blockchain networks, stablecoins, crypto exchanges, and DeFi protocols API Development: Design, implement, and optimize APIs that connect businesses to HIFI’s financial infrastructure platform, with a focus on performance, reliability, and developer experience. Core Infrastructure: Build and scale backend systems that process transactions, ensure correctness, and provide strong guarantees around scalability, reliability, and fault tolerance. Transaction Reliability: Optimize transaction throughput, gas efficiency, and system resilience across chains and distributed services Collaboration: Work closely with product, compliance, and business teams to deliver end‑to‑end solutions Ownership: Participate in technical roadmap planning and carry projects from design through production User Focus: Engage with customers to understand their needs and translate them into effective solutions Basic Qualifications Bachelor’s degree in Computer Science, Engineering, Math, or related STEM field, or equivalent practical experience 2+ years of professional software development experience Experience working with RESTful APIs Familiarity with blockchain concepts (EOA vs. SCA, blockchain consensus, signature, EIP protocol, replay attack, transactions, events, etc.) Experience with PostgreSQL or other relational databases Working knowledge of version control (Git), CI/CD pipelines, testing, and monitoring/observability tools Strong communication and collaboration skills with both technical and non‑technical teams Preferred Skills & Experience Interested candidates who meet the basic qualifications should consider applying. The following preferred skills and experience are helpful for this role, but candidates with only some of them are able to be successful on our team. Learning on the job is critical success and part of the excitement of working at HIFI. Hands‑on experience building or integrating with smart contracts (Solidity, Rust, Move, or similar) Strong understanding of blockchain architecture, consensus mechanisms, and applied cryptography fundamentals Experience working with Ethereum and EVM‑compatible chains (Polygon, Arbitrum, Base, Avalanche, etc.) as well as Solana; familiarity with additional ecosystems such as Sui, Tron, or Canton is a plus Proficiency with Web3 development tooling (ethers.js, viem, wagmi, web3.js, Hardhat, Foundry, etc.) Knowledge of event‑driven architectures and messaging patterns (pub/sub, queues, streaming) Practical experience with production‑grade gas management across different networks Exposure to job queues, caching systems, and data pipelines in distributed environments Deep understanding of security best practices for blockchain protocols and financial systems Track record of building or scaling blockchain‑enabled products from zero to one Background in financial systems, payments, or stablecoin infrastructure Additional Requirement Must be within a commutable distance from our office and able to work in person most days of the week #J-18808-Ljbffr HIFI

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