Senior Backend Engineer, Onchain

🕒 April 29

🗽 New York – Remote

🗽 New York – Remote

⏰ Full Time

🟠 Senior

🔙 Backend Engineer

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Polymarket

WebsiteLinkedInAll Job Openings

11 - 50 employees

Founded 2020

₿ Crypto

🎲 Gambling

💸 Finance

Crypto • Gambling • Finance

Polymarket is a prediction market platform that enables users to wager on the outcomes of various events, including political elections, sports contests, and cryptocurrency price movements. Operating as a decentralized betting service, it allows participants to buy and trade shares in event outcomes, providing a unique way to engage with and speculate on future scenarios. Polymarket combines elements from both traditional markets and blockchain technology, creating an innovative environment for users to make predictions and potentially profit from their insights.

📋 Description

• Build and maintain onchain execution infrastructure. Design and operate the relayer systems, transaction pipelines, and settlement logic that power Polymarket's markets end-to-end. • Architect high-performance backend systems. Build reliable, scalable APIs and services that handle high transaction volumes and real-time data with low latency. • Own RPC and chain connectivity. Implement and scale the endpoints and integrations that keep Polymarket reliably connected to EVM networks. • Optimize performance and reliability. Push the limits of throughput and efficiency across our onchain systems, ensuring seamless operation as volume grows. • Enhance security and fault tolerance. Apply best practices for secure, highly available distributed systems — especially in adversarial onchain environments. • Contribute to code quality. Participate actively in code reviews and help maintain a high engineering bar across the team. • Stay close to the frontier. Track developments across EVM ecosystems and blockchain infrastructure, and bring relevant innovations back to Polymarket's stack.

🎯 Requirements

• 5+ years of experience in backend development • Strong fundamentals: clean, well-tested code; solid database design (PostgreSQL or equivalent); well-structured APIs • Solid understanding of how EVM networks work: transaction lifecycle, gas mechanics, mempool dynamics, smart contract interactions • Experience with systems-level languages: Golang is strongly preferred; Rust or C++ also valued • Familiarity with blockchain infrastructure: RPC nodes, event indexing, relayer architectures, or similar • Excellent problem-solving skills and the ability to work through ambiguous, high-stakes technical challenges • (Plus) Direct experience building or operating a relayer system • (Plus) Experience with Ethereum rollup technologies (Arbitrum Nova, Optimism, etc.) • (Plus) Experience with BFT consensus engines, libp2p, or core node software • (Plus) Open source contributor in the blockchain ecosystem • (Plus) Active on ethresear.ch or similar protocol research forums

🏖️ Benefits

• Competitive salary & equity • Unlimited PTO • Full Health, Vision, & Dental coverage • 401k match • Hardware setup: new MacBook Pro, big display, & accessories