Staff Software Engineer, Platform Engineering

WHAT WE DO Rillet serves accounting and finance teams. Our customers are the financial brains of their companies. Our job is to help them run the numbers with impossible speed, accuracy, and insight. Rillet is an AI-native ERP that can drive a zero-day close. We are different because of our unified source-of-truth data model, hundreds of best-in-class native integrations (Stripe, Ramp, Salesforce, etc), automated & auditable workflows, multi-entity consolidation, and quickly expanding army of specialized AI agents (e.g., accrual, audit, P&L flux, board decks, etc). These earn us a consistently perfect customer satisfaction score https://www.g2.com/products/rillet/reviews. High-growth AI customers like Mercor, and Function Health love our ship velocity, because their financial stack needs to scale as quickly as they do. This huge market is ours to take. We have raised $100M from leading investors (including Sequoia, a16z, Iconiq, Oak HC/FT, and First Round) to help everyone run their 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. Successful Rilleteers do not wait for assignments. They internalize a mission, design a strategy, and bring back results that are better, faster, and more creative than a manager could have asked for. Work revolves around our customers. Successful Rilleteers are energized by delivering the most important things, even those that weren’t in the original plan. In this role, you do not need to be an accountant. But you do need to appreciate the value that our customers can create for their own company when we equip them with the perfect financial tools. Successful Rilleteers love powering the financial core of the world’s fastest-growing companies. WHO WE NEED Rillet's platform is the foundation every engineer builds on. As one of our first Staff Engineers, you'll have real ownership over the systems, standards, and infrastructure that determine how fast and how well we can move as a company. This isn't a role where you'll be handed a well-defined problem space. You'll be identifying the problems worth solving, making the architectural calls, and setting patterns that will shape how we build for years. We're an AI-native company, and we expect our engineers to bring that same mindset to how they work. If you're energized by using AI to move faster, think bigger, and solve problems in ways that weren't possible a few years ago, you'll fit right in. If you're looking for a role with genuine technical scope, the ability to influence a company at an inflection point, and work that matters beyond your immediate team, this is it. We're looking for teammates who value in-person collaboration and are within commutable distance of our NYC office (or willing to relocate). Team members work in-office Tuesdays and Thursdays, plus one additional flexible day. WHAT YOU'LL DO - Own the architecture, infrastructure, and developer tooling that every engineer at Rillet depends on, from CI/CD and deployment practices to the systems that keep us shipping fast and safely at scale. - Set the technical direction for how we build reliability, security, and compliance into our systems from the ground up. - Shape the design and scalability of our external API, turning it into a competitive asset for customers and partners. - Partner with engineering leadership to define roadmap priorities and translate ambiguous problems into clear technical plans. - Raise the craft of the engineers around you through design reviews, mentorship, and leading by example. WHO WE'RE LOOKING FOR - 8+ years of software engineering experience delivering ground-breaking & complex systems at scale - Familiarity with the state of the art in your domain, and capacity to create solutions where no prior art exists. - Deep expertise in cloud infrastructure, distributed systems, or developer productivity - Hands-on experience with CI/CD, obse