Design Engineer at Rillet in San Francisco, CA

Job description

What We Do Rillet serves accounting and finance teams, the financial brains of their companies. Our job is to help them run the numbers with impossible speed, accuracy, and insight. Rillet is the Agentic ERP built for modern finance teams. We help companies automate the most critical parts of finance, from closing the books and recognizing revenue to consolidating entities and reporting to investors. More than 600 companies run on Rillet, including Mercor, Scribe, and Function Health, and we partner with leading accounting firms including EY and KPMG. We’re building in one of the largest software markets in the world, with the momentum to match. Rillet has raised more than $200M, is valued at $1B, and is backed by Sequoia, a16z, ICONIQ, Bain Capital Ventures, Oak HC/FT, and other leading investors. We’re using that backing to build the financial infrastructure for the next generation of companies and help every business run its numbers at the speed of AI. Who We Are Rillet’s pace is not for everyone. Intelligence is table stakes. To succeed here, you need extreme speed, agency, and flexibility. The people who thrive at Rillet do not wait for assignments. They internalize the mission, design a strategy, and bring back results that are better, faster, and more creative than a manager could have asked for. Our work revolves around our customers. The people who succeed here are energized by delivering what matters most, even when it was not part of the original plan. Rillet is built on deep accounting expertise, and it takes people from many disciplines to build a category-defining company. You do not need to be an accountant to thrive here. You do need to care deeply about the problems we solve and the impact our customers can create. Together, we combine the precision of accounting with the speed, creativity, and ambition of AI-native software to power the financial core of the world’s fastest-growing companies while redefining what finance teams should expect from their software. Who We Need We're looking for an engineer who is obsessed with AI and keeps finding things to build with it. You try new tools, follow an idea far enough to make it work, and have projects you're excited to show us. You'll build across Rillet's product, internal tools, and experimental work. That could mean making a daily workflow faster, building a tool that removes repetitive work, or prototyping a new way for people to interact with AI. You'll help spot useful opportunities and take them from an initial idea to something people can use. Rillet gives you real accounting problems to solve alongside engineers, designers, and accounting experts. You'll see where new capabilities help and where they fall short. Financial software needs to earn people's trust: answers need evidence, actions need clear consequences, and mistakes need to be caught. There's room to experiment and a reason to care deeply about getting the details right. What You'll Do Build product features, internal tools, and prototypes that apply AI to practical problems. Work could include finding relevant financial records, automating a repetitive task, or helping someone review an agent's proposed actions. Get close to the people using what you build. Understand the task, identify friction, and test whether your idea makes their work easier. Try new models, tools, and ways of building. Bring back working examples and a clear view of where they could be useful at Rillet. Make AI features clear and usable. Design interactions that help people understand an answer, inspect its sources, and stay in control of what happens next. Work with experienced engineers and accounting experts to test behavior, catch failures, and turn promising work into reliable software. Follow through after release and improve it based on use and feedback. Who We're Looking For You're creative in how you solve problems. You draw inspiration from unexpected places and build alternatives to see whether there's a bett