Protocol Engineer

Voiceflow; New York (NY); On-site; USD 120,000 - 160,000; Full time

Job summary

Voiceflow is seeking a Protocol Engineer to join its core blockchain team in New York. In this role, you will design and implement secure smart contracts and blockchain integrations, collaborating with teams to develop solutions for Web3 payments. Applicants should have significant experience in smart contract development on major blockchain platforms, and a solid understanding of blockchain architecture and DeFi protocols. The company values clear communication and a security-first mindset in candidates.

Qualifications

• Strong experience building and deploying production smart contracts.
• Deep understanding of blockchain architecture and consensus mechanisms.
• Hands-on experience with smart contract development languages.
• Solid grasp of DeFi protocols and token standards.
• Knowledge of common smart contract vulnerabilities.

Responsibilities

• Design and deploy secure smart contracts across multiple blockchain platforms.
• Collaborate with teams to architect blockchain solutions.
• Write efficient, well-tested code and participate in security audits.
• Research new blockchain technologies for integration opportunities.
• Contribute to incident response on-chain issues.

Skills

Smart contract development

Blockchain architecture

Cross-chain communication

Security best practices

DeFi protocols

Tools

Solidity

Rust

Move

Job description

Role Overview

We're looking for a Protocol Engineer to join our core blockchain team and help build the foundation of Web3 payments infrastructure. This high-impact role offers the opportunity to work on challenging technical problems at the intersection of smart contracts, cross‑chain protocols, and decentralized finance.

You will design and implement secure, efficient smart contract systems and blockchain integrations that power millions of transactions across multiple chains. This role is perfect for a technically strong engineer who thrives in fast-paced environments and wants to shape the future of decentralized finance.

Responsibilities

• Design, develop, and deploy secure smart contracts and protocol implementations across multiple blockchain platforms
• Collaborate with backend and product teams to architect blockchain solutions that meet business requirements
• Write highly efficient, well‑tested code and participate in security audits to ensure protocol safety
• Research and evaluate new blockchain technologies, protocols, and DeFi primitives for integration opportunities
• Contribute to incident response and debugging on‑chain issues to ensure protocol reliability

Requirements

• Strong experience building and deploying production smart contracts on major blockchain platforms
• Deep understanding of blockchain architecture, consensus mechanisms, and cryptographic principles
• Hands‑on experience with smart contract development languages (Solidity, Rust, Move, etc.)
• Solid grasp of DeFi protocols, token standards, and cross‑chain communication patterns
• Strong security mindset with knowledge of common smart contract vulnerabilities and best practices
• Clear communicator who can explain complex blockchain concepts to cross‑functional teams

Nice to Have

• Production experience with multiple blockchain ecosystems (Ethereum, Solana, L2s, etc.)
• Previously worked at crypto startup or Web3 infrastructure company
• Experience with cross‑chain bridges, oracles, or interoperability protocols
• Background with high‑volume DeFi protocols or DEX infrastructure
• Contributions to blockchain open source projects or protocol research
• Experience with formal verification or advanced smart contract testing frameworks