What are the responsibilities and job description for the Polymarket - Senior Platform Engineer position at deCircle?
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.
What you’ll do
We're looking for an experienced individual contributor who enjoys working on deeply technical problems and optimizing mission-critical infrastructure.
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.
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
(Plus) Blockchain-specific backend experience (e.g., working on BFT consensus engines, event indexing systems, libp2p)
(Plus) Experience with Ethereum roll-up technologies (e.g., Arbitrum Nova, Optimism)
(Plus) Open source contributor
(Plus) 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.