Software Engineer — Blockchain Payment Infrastructure —Halliday - San Francisco / New York — Hybrid

Halliday is a blockchain infrastructure company building cross-chain payment systems that enable users and developers to perform onchain transactions across multiple networks. This hybrid role in San Francisco or New York focuses on building distributed backend infrastructure that powers blockchain payments, transaction orchestration, and developer integrations.

The engineer will design secure APIs, backend services, and data pipelines using technologies such as TypeScript, Go, Python, or Rust, while integrating blockchain networks including EVM chains, Solana, and Bitcoin. This position contributes to web3 smart contract roles by enabling scalable payment infrastructure and supporting secure transaction execution across blockchain ecosystems.

This position supports blockchain infrastructure roles focused on building scalable backend systems that enable cross-chain payments and transaction processing.

🔹 Responsibilities

• Design and develop backend services that support blockchain payments, transaction orchestration, and integration with payment systems such as ACH, cards, and crypto networks
• Build distributed systems, APIs, and data pipelines that interact with multiple blockchain networks while ensuring reliability and performance
• Integrate blockchain SDKs and interact with smart contracts and blockchain protocols including EVM chains, Solana, and Bitcoin
• Contribute to developer-facing SDKs and APIs to simplify blockchain payment integrations
• Implement monitoring, testing, and security controls to maintain system stability and scalability
• Collaborate with product, frontend, and design teams to deliver production-ready features
• Improve and extend the company’s cross-chain payment protocol by adding integrations and optimizing transaction workflows

These expectations reflect what recruiters look for in crypto jobs when hiring engineers working on distributed payment infrastructure.

🔹 Requirements

• Experience building backend systems, APIs, or distributed infrastructure in production environments
• Proficiency in backend programming languages such as TypeScript/Node.js, Go, Python, or Rust
• Strong understanding of distributed systems concepts including consistency, reliability, and fault tolerance
• Ability to design scalable services, APIs, and data pipelines
• Strong problem-solving skills and ability to implement practical technical solutions
• Ability to work effectively in collaborative engineering teams

🔹 Nice-to-Have Qualifications

• Experience working with blockchain technologies such as Ethereum, Polygon, Base, Solana, or Bitcoin
• Familiarity with Web3 libraries such as ethers.js, viem, or web3.js
• Experience building payment systems or integrating with payment APIs such as Stripe or Plaid
• Experience working with distributed system architectures including event-driven systems and message queues
• Knowledge of cryptographic primitives, signing mechanisms, or key management
• Experience with cloud infrastructure platforms such as AWS or GCP
• Familiarity with containerization tools such as Docker or Kubernetes
• Experience developing or auditing smart contracts using Solidity or Rust
• Open source contributions or experience maintaining public libraries

🔹 Compensation & Benefits

• Base salary range: $150,000 – $190,000 USD per year
• Equity included as part of total compensation (exact details not specified)
• Visa sponsorship available for international candidates
• Unlimited paid time off
• Competitive benefits package (additional details shared during hiring process)

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