Senior Software Engineer - Clearing

Who We Are: Keystone AI is a US-headquartered self-clearing broker-dealer and brokerage infrastructure for stocks, ETFs, options, crypto, fixed income, 24/5 trading, and more. Our recent Series D funding round brought our total investment to over $320 million, fueling our ambitious vision. Amongst our subsidiaries, Keystone AI is a licensed financial services company, serving hundreds of financial institutions across 40 countries with our institutional-grade APIs. This includes broker-dealers, investment advisors, wealth managers, hedge funds, and crypto exchanges, totalling over 9 million brokerage accounts. Our global team is a diverse group of experienced engineers, traders, and brokerage professionals who are working to achieve our mission of opening financial services to everyone on the planet . We're deeply committed to open-source contributions and fostering a vibrant community, continuously enhancing our award-winning, developer-friendly API and the robust infrastructure behind it. Keystone AI is proudly backed by top-tier global investors, including Portage Ventures, Spark Capital, Tribe Capital, Social Leverage, Horizons Ventures, Unbound, SBI Group, Derayah Financial, Elefund, and Y Combinator. Our Team Members: We're a dynamic team of 230+ globally distributed members who thrive working from our favorite places around the world, with teammates spanning the USA, Canada, Japan, Hungary, Nigeria, Brazil, the UK, and beyond! We're searching for passionate individuals eager to contribute to Keystone AI 's rapid growth. If you align with our core values—Stay Curious, Have Empathy, and Be Accountable—and are ready to make a significant impact, we encourage you to apply. Your Role: As a Senior Software Engineer on the Clearing team you’ll work on what happens after the trade is made. Most of the work we do is not user facing (although we have some user facing systems as well) but is very much essential to the day to day operations of a Broker Dealer company. During the past couple years we’ve become self-clearing in US equities , US options , and this is the team at the heart of those achievements. We’re not stopping there: there are always new (not yet announced) integrations to build, and new product offerings to enable through those integrations. Beyond core clearing, we also work on securities finance related functions and building the infrastructure that allows us to launch new product offerings, like Fully Paid Securities Lending . There may also be additional exciting initiatives currently in development. Things You Get To Do: Work in a team where we value quality of thinking, excellence in execution, practical solution and willingness to take responsibility, instead of tenure, hierarchy, or arguing about the theoretical benefits of things that don’t matter Own projects from ideation to deployment, cutting through ambiguity to build what’s necessary, not just what’s asked for. Design and build new systems that let us enable new products for the company or unlock more revenue Refine our existing systems. They’re not perfect and will never be, but we believe in improving them as long as the outcome is meaningful and tangible Learn about things you never knew existed but are instrumental in keeping the financial markets healthy and functioning Learn what it takes to build a company like Keystone AI , see behind the curtains, and cooperate with great people from other teams. You also get to influence what we do and how we do it! Participate in our on-call rotation to ensure our systems are in tip-top shape. We value our free time as much as you do, so we prioritize eliminating issues that cause friction for the team. Who You Are (Must-Haves): You understand that we’re working on systems people entrust with their hard earned money and you take that very seriously You are deeply interested in how traditional financial markets work You (have taken and) can take the lead on a project: we’ll describe what we’re trying to fix or build, who to reach out to if you need help, and you’ll handle the rest You take responsibility for the work you do personally, and also collectively, as a team. If there’s an issue and you’re the only one around, then you roll up your sleeves instead of saying you didn’t write the code. You understand which design choices matter and which ones can be easily adjusted once we learn more about how the world truly works You know when you don’t know something and you seek out that information instead of faking, guessing, or having an LLM do the thinking for you You don’t cling to your ideas: if new information surfaces then you can let things go and focus on what truly matters You want to see the long-term impact of your decisions and take on larger and larger efforts, leveraging the expertise you’ve gained along the way. We value people who stick around to see their systems scale and evolve over time. You have experience working at startups and know that not everything is perfect and you’re the one who helps