Software Engineer

• Develop and optimize order matching engines, trade execution algorithms, and supporting data structures
• Build high-performance market data feeds and trading APIs used by clients, brokers, and market makers
• Design and maintain highly available clearing systems, including margining, collateral management, and banking integrations
• Lead integrations with external market makers, brokers, hedge funds, and other institutional participants
• Stress test large-scale, mission-critical systems to ensure robustness, reliability, and maintainability
• Optimize internal algorithms, services, and database access patterns for maximum performance
• Design and implement new market structures (scalars, futures, non-binaries, and more)
• Work closely with users and partners—defining features, shipping products, and iterating quickly
• Ship fast and with high quality, exercising strong judgment and independence
• Make decisions autonomously in an environment with high ownership and minimal bureaucracy
• As Kalshi grows, evolve your role while helping shape our engineering culture, systems, and product direction

• 4+ years of software engineering experience
• Experience planning and leading large projects with meaningful long-term impact
• Strong technical depth and ability to solve complex engineering problems end-to-end
• Solid understanding of relational databases, transactions, and data modeling
• Familiarity with building highly concurrent, distributed, or real-time systems
• Track record of creating and improving development processes, tooling, and workflows
• Excellent judgment in prioritization and ability to move quickly without sacrificing quality
• Growth mindset with a steep trajectory and eagerness to learn
• Deep care for the craft—you take ownership, obsess over quality, and hold a high bar
• Ability to ship at high velocity

• Experience building financial systems, FIX protocols, clearing infrastructure, or broker connectivity
• Proven success designing or scaling large distributed systems
• Interest in working directly with customers or external partners

equity and benefits