Senior 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 We're looking for an experienced engineer to take meaningful ownership over the infrastructure, tooling, and platform systems that every engineer at Rillet depends on. You'll work closely with our CTO, engineering leadership, and product teams to shape not just what we ship, but how we build as an engineering organization. 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 and solve problems differently, you'll fit right in. We're looking for teammates within commutable distance of our NYC or San Francisco offices (or willing to relocate). Team members work in-office Tuesdays and Thursdays, plus one additional flexible day. What You'll Do - Own the infrastructure, CI/CD, and developer tooling that keeps our engineering team shipping fast and safely at scale. - Set the technical direction for reliability, security, and compliance, building these in from the ground up rather than bolting them on later. - 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. - Mentor engineers on the team through design reviews and hands-on collaboration, raising the technical bar across the org. Who We're Looking For - 5+ years of software engineering experience with a track record of leading large-scale projects and architecting scalable systems - Deep expertise in cloud infrastructure, distributed systems, or developer productivity - Hands-on experience with CI/CD, observability tooling, and cloud infrastructure (AWS, GCP, or Azure) - Comfortable driving technical decisions across teams and making hard tradeoffs under pressure - Actively incorporates AI tools into your day-to-day workflow, not just as a productivity shortcut but as a way to tackle problems differently - Energized by building in a fast-moving environment where the playbook is still being written Bonus Points - Background in fintech, ERP, or accounting software - Expertise in AWS - Experience ownin