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Backend Engineer (Core)

Kalshi

$100,000 - $250,000
Oct 7, 2025
New York, NY, US
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Kalshi is building a next-generation financial ecosystem, aiming to create the largest financial market on the planet by defining a new category: prediction markets. They need to build core exchange, clearinghouse, API infrastructure, and connectivity to brokers and market makers from scratch.

Requirements

  • 4+ years of software engineering experience.
  • Experience planning and leading large projects with long-term impact on a single system or team.
  • Strong technical grasp and ability to tackle complex engineering problems that deliver results.
  • Solid understanding of relational databases and transactions.
  • Familiar with writing highly concurrent systems.
  • Experience building financial systems, FIX API, clearing infrastructure, broker connectivity, etc.
  • Proven experience building large-scale systems

Responsibilities

  • Order matching and trade execution algorithms and data structures.
  • High-performance data feeds and trading APIs for clients.
  • High guarantee and availability clearing systems, including margining, collateral management, and banking integrations.
  • Lead integrations with external market makers, brokers, and hedge funds.
  • Stress test large-scale critical systems to ensure their robustness and maintainability.
  • Optimize database access patterns and internal algorithms to improve the performance of our different services.
  • Design new market structures (e.g., non-binary markets, scalars, futures, etc.).

Other

  • We hire really talented people, work really hard, and enjoy the climb.
  • Can ship at incredible speed (very simple).
  • Meritocracy is at our core, and we value people who take ownership and figure (usually hard) things out.
  • We dream big.
  • Love of the craft: you genuinely care and put your all into your work.