Software Engineer (Trading Platform)

We are building a next-generation financial ecosystem (think NYSE or CME from scratch)

As part of Kalshi, you will work on various platforms, including core exchange, clearinghouse, API infrastructure, connectivity to brokers and market makers, and others

We are a small team, which means your responsibilities scale very rapidly, and your contributions are clear and visible, not marginal

There is still a lot of green field at Kalshi and a low of it (including entire systems) can be yours

This role will 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.)

Be close to the customer (define features, ship products, iterate)! Even the backend can choose to be close to customers depending on the project

Ship fast and with high quality

Make decisions: we give a lot of flexibility, which also means no spoon-feeding

The company is growing fast, which means your role will evolve and grow with the company. Joining Kalshi means you’ll be exposed to all parts of the business and define our culture and product paths- Solid understanding of relational databases and transactions

Familiar with writing highly concurrent systems

Growth mindset, with a high slope and eagerness to lean

Love of the craft: you genuinely care and put your all into your work

Strong technical grasp and ability to tackle complex engineering problems that deliver results

Experience planning and leading large projects with long-term impact on a single system or team

Excellent judgment on task prioritizations

History of creating and applying new processes and tooling to increase engineering efficiency

4+ years of software engineering experience

Can ship at incredible speed (very simple)

Proven experience building large-scale systems

Experience building financial systems, FIX API, clearing infrastructure, broker connectivity, etc

Like to interact directly with customers