Senior Platform Engineer

Job Overview

Polymarket is the world’s largest prediction market platform. We enable individuals to express views on real-world events by trading on outcomes across politics, economics, sports, culture, and current affairs. Built as a peer-to-peer marketplace with no centralized “house,” Polymarket aggregates diverse opinions into transparent, market-based probabilities that reflect collective expectations about the future. We're growing fast – both in terms of volume ($21B traded in 2025) and adoption as an alternative news source. Our ambition is to become a ubiquitous beacon of truth in global media and we need your help adding fuel to the fire.

About the Role

Polymarket is looking for a world-class backend engineer to join our platform engineering team as we scale. The ideal candidate is obsessed with performance, security, and scalability—someone who can architect and optimize high-throughput systems with cutting-edge infrastructure. You will play a key role in building and maintaining the foundation that powers our prediction markets, ensuring reliability and efficiency as we continue to grow.

Key Responsibilities

• Architect & build backend systems. You'll design, implement, and maintain high-performance backend services and APIs that handle large-scale transactions and real-time data.


• Optimize performance & scalability. You’ll push the limits of our system’s throughput and efficiency, ensuring seamless operation at scale.


• Enhance security & reliability. You’ll implement best practices for secure, fault-tolerant, and highly available distributed systems.


• Cross-company collaboration. You’ll collaborate with front-end engineers, designers, and stakeholders across the company to deliver a fully integrated user experience.


• Contribute to code reviews. You'll play a critical role in maintaining the high quality of our codebase by providing feedback and suggestions on others' work during code review sessions.


• Participate in research & innovation. You’ll stay at the forefront of blockchain-based trading technologies, exploring new solutions to improve our platform.


• Interface with Customers. You’ll communicate directly with customers, providing support and gathering feedback.

Required Qualifications

• 8+ years of experience in backend development


• Experience architecting and developing solutions to ambiguous problems with significant impact and high usage


• Master-level proficiency in systems programming languages like Golang, Rust, or C++


• Strong knowledge of database systems and internals (e.g., PostgreSQL, MongoDB)


• Experience with cloud platforms (e.g., AWS, GCP) and infrastructure as code (e.g., Terraform, Ansible)


• Excellent problem-solving and communication skills

Preferred Qualifications

• Blockchain-specific backend experience (e.g., working on BFT consensus engines, event indexing systems, libp2p)


• Experience with Ethereum roll-up technologies (e.g., Arbitrum Nova, Optimism)


• Open source contributor


• Active participant on ethresear.ch

Benefits

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