Senior API Engineer - Polymarket US
Job Description
About Polymarket
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 an experienced API engineer to develop and deploy endpoints for our ISV customers. You'll build the critical systems that facilitate access to our CFTC-regulated exchange, working directly on REST and FIX API systems.
This is a high-impact role where you'll work directly with engineering teams, build systems that handle liquidity at scale, and help establish the technical foundation for our growing US Exchange business.
What You’ll Do
- •Maintain API access to our US Exchange. Create systems that help ISV participants and institutional customers set market prices on the US Exchange.
- •Oversee Onboarding of Market Makers. Partner closely with our growing Forward Deployed Engineering team to help market makers access the API.
- •Manage FIX / REST / SDK Integrations. Architect and test systems for handling various institutional customers and access needs.
- •Design for scale and compliance. Build systems that handle thousands of daily transactions while maintaining audit trails and meeting CFTC regulatory requirements.
- •Collaborate with internal teams. Partner closely with operations, compliance, and product to understand workflows, gather feedback, and iterate quickly on tooling.
- •Lead technical decisions. Participate in architecture discussions, code reviews, and help establish best practices for the team.
What We’re Looking For
- •3-10 years of professional software development experience
- •Strong FIX / REST / SDK experience with direct previous projects
- •Solid experience with AWS, Cloudfare, Kubernetes, Kafka
- •Experience building data-heavy applications or tools
- •Strong collaboration and communication skills—you work well with non-technical stakeholders
- •Bias for action—all-in work mindset eager to work immediately on solving problems
- •Builder's mindset—you take pride in creating tools that solve real operational problems
- •(Plus) Background in fintech, payments, reconciliation systems, or regulated environments
- •(Plus) Understanding of regulated exchange backend and audit requirements
- •(Plus) Bachelor's degree in Computer Science or equivalent
Benefits
- •Competitive salary & equity
- •Unlimited PTO
- •Full Health, Vision, & Dental coverage
- •401k match
- •Hardware setup — new MacBook Pro, big display, & accessories
About Polymarket
Polymarket is at the forefront of the decentralized information and prediction market revolution, leveraging cutting-edge blockchain technology to create a more transparent and efficient way to bet on real-world events. We're building a platform where users can trade on their beliefs about everything from politics to pop culture, fostering a global community driven by data and conviction. Our mission is to democratize access to information and enable price discovery in a trustless environment, fundamentally reshaping how people engage with and understand the world. Our team thrives on innovation, intellectual curiosity, and a deep-seated belief in the power of Web3 principles. We champion a culture of open collaboration, radical transparency, and continuous learning, encouraging every team member to contribute their unique perspective to solve complex challenges. We are a group of passionate builders, designers, and strategists united by a vision for a decentralized future, where markets are fair, accessible, and censorship-resistant. At Polymarket, your work directly impacts the evolution of decentralized finance and information. If you're eager to make a significant impact in the nascent but rapidly expanding blockchain space, Polymarket offers an unparalleled opportunity. Join us to contribute to a platform that empowers users, challenges traditional financial systems, and puts the power of prediction back into the hands of the people. We're looking for individuals who are not just skilled but are also true believers in the potential of crypto to create a more informed and equitable world. Come build the future with Polymarket.
Ready to Apply?
To submit your application for this position, please visit Polymarket's official website and follow their application process.