Backend Engineer: Real-Time Trading & Market Infrastructure

SupportFinity™; New York (NY); On-site; USD 100,000 - 250,000; Full time

Job summary

Kalshi is hiring a backend engineer to architect and scale core exchange systems in NYC. You will own trading, clearing, and connectivity infra, designing high-performance systems handling real-time order flow, margining, and integrations with market makers and brokers.

You will shape market structure and backend architecture, with ownership on a small, senior team driving stability, performance, and evolution of the platform.

Qualifications

• 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.

Responsibilities

• 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.

Job description

Kalshi is hiring a backend engineer to architect and scale core exchange systems in NYC. You will own trading, clearing, and connectivity infra, designing high-performance systems handling real-time order flow, margining, and integrations with market makers and brokers.

You will shape market structure and backend architecture, with ownership on a small, senior team driving stability, performance, and evolution of the platform.