Full-Stack Engineer — Weekend Team
Location: Remote
Schedule: Thursday–Monday
Employment Type: Full-time
Onyx is building the consumer trading platform for the speculation economy—bringing prediction markets, sports, crypto, and real-world events into one seamless experience.
Following our Series A led by Payward, we’re growing the engineering team behind our real-time trading platform. We’re looking for a Full-Stack Engineer to own critical product development and platform reliability across our Thursday–Monday schedule, when customer activity is at its highest.
What You’ll Do
• Build and ship customer-facing features across the frontend and backend
• Develop scalable applications using TypeScript, React, Node.js, and PostgreSQL
• Own projects from technical design through development, deployment, and monitoring
• Build real-time experiences powered by live data and streaming updates
• Integrate frontend applications with backend APIs and AWS-based services
• Monitor platform performance and respond to production issues during high-volume periods
• Improve application reliability, scalability, testing, and observability
• Collaborate with Product, Design, Trading Operations, and Engineering
• Contribute to technical decisions, code reviews, and engineering best practices
• Help create a smooth handoff between the weekend and weekday engineering teams
What We’re Looking For
• 2+ years of professional full-stack software engineering experience
• Strong experience with TypeScript, React, Node.js, and SQL
• Experience building and maintaining production applications
• Solid understanding of APIs, databases, frontend architecture, and cloud infrastructure
• Experience with AWS, CI/CD workflows, testing, debugging, and monitoring
• Comfortable troubleshooting production issues and working across the stack
• Strong product intuition and attention to customer experience
• Able to work independently and take ownership in a fast-moving startup
• Available to work a consistent Thursday–Monday schedule
• Experience with WebSockets, real-time data, fintech, trading, sports, gaming, crypto, or other high-volume consumer products is a plus
Why Onyx
• High ownership over meaningful, customer-facing work
• Competitive compensation and meaningful equity
• Remote position with a consistent Thursday–Monday schedule
• Opportunity to join a fast-growing company at an early stage
• Work alongside a team with experience from Jane Street, DraftKings, Robinhood, xAI, and Harvard
This is a full-time remote position. Candidates must be authorized to work in the United States; we are unable to provide employment sponsorship at this time.