Software Engineer

Onyx is building the consumer trading platform for the speculation economy - bringing sports, prediction markets, crypto, and real-world events into one seamless experience.

Following rapid growth, Onyx raised a $20 million Series A at a $220 million valuation , led by Payward, the parent company behind Kraken, NinjaTrader, and Bitnomial. We are building a category-defining product with a highly technical team from companies including Jane Street, DraftKings, Robinhood, and xAI.

We are looking for a Software Engineer to help build and scale the systems powering a fast-moving, real-time trading platform. This is a high-ownership role with direct influence over the product, architecture, and technical roadmap.

What You’ll Do

• Build and scale backend services using Node.js and TypeScript
• Design APIs, database schemas, and distributed systems supporting real-time markets and trading activity
• Work with PostgreSQL, AWS, queues, caching, and third-party integrations
• Own projects from technical design through deployment and production monitoring
• Improve the performance, reliability, and scalability of core platform systems
• Collaborate closely with engineering, product, and trading teams to ship quickly

What We’re Looking For

• 2+ years of professional software engineering experience
• Strong experience with Node.js, TypeScript, APIs, and relational databases
• Experience designing and operating production systems
• Strong understanding of database and API design
• High ownership, strong technical judgment, and comfort working in a fast-paced startup
• Interest in trading, financial markets, sports, crypto, or prediction markets
• Experience with PostgreSQL, AWS, Redis, message queues, WebSockets, Terraform, or high-volume transactional systems is a plus.

Logistics

• Location: NoHo, New York City
• Schedule: Hybrid, with regular in-office collaboration
• Compensation: $175,000–$250,000 in total cash compensation, plus meaningful equity
• Benefits: Competitive health and employee benefits, flexible PTO, and meaningful ownership in a rapidly growing company
• Experience: 2+ years
• Work authorization: Candidates must already be authorized to work in the United States. Onyx cannot provide current or future visa sponsorship for this role.