Staff Engineer, Seller Systems

Who we are About Keystone AI Keystone AI is a financial infrastructure platform for businesses. Millions of companies—from the world's largest enterprises to the most ambitious startups—use Keystone AI to accept payments, grow their revenue, and accelerate new business opportunities. Our mission is to increase the GDP of the internet, and we have a staggering amount of work ahead. That means you have an unprecedented opportunity to put the global economy within everyone's reach while doing the most important work of your career. About the team The Seller Systems team is dedicated to empowering sellers and stakeholders at Keystone AI by streamlining and optimizing the selling process. This is a top priority for Keystone AI as it expands its enterprise revenue globally. We build tools and systems to make the end-to-end selling process across initial contact with customers, deal modeling, negotiation, approvals, contracting, onboarding, and activation absolutely world class. We treat this area as an engineering problem from first principles, implemented with a hybrid architecture of first-party-developed custom Keystone AI components interoperating with third-party standard business components. Our vision is to be able to offer a single plane of glass experience to our Sellers at Keystone AI, to allow them to leverage AI through workflows that allow them to minimize overhead and increase their time on increasingly efficient selling. What you'll do As a Staff Engineer in Seller Systems, you'll be a technical anchor for one of Keystone AI's highest-priority engineering investments—building the infrastructure that powers how Keystone AI sells to and wins customers globally. You'll own and drive multi-year technical strategy across a complex hybrid architecture of first-party Keystone AI systems and third-party platforms (including Salesforce), while directly shaping the seller experience across the full quote-to-cash lifecycle. You'll set the architectural direction and be a multiplier across teams—owning end-to-end technical decisions that span seller-facing workflows, core platform services, and integrations with Keystone AI's financial infrastructure. Responsibilities • Architect and build scalable, reliable systems that underpin Keystone AI's sales motion, including APIs and services that support deal creation and modeling, multi-party approval workflows, contract generation, and merchant onboarding at global scale • Lead Keystone AI's "single plane of glass" vision for sellers—driving architectural decisions on how first-party Keystone AI components and third-party platforms (e.g., Salesforce) interoperate, and designing systems that surface the right data and actions to sellers at the right time • Integrate AI and agentic workflows into the selling process, identifying high-leverage opportunities to automate seller overhead—from intelligent deal recommendations and pricing guidance to automated contract workflows and proactive activation nudges • Partner cross-functionally at a senior level with Go-to-Market, Finance, Legal, and Product teams to deeply understand the selling process and translate business requirements into durable technical solutions that scale with Keystone AI's growth • Raise the technical bar across the team—conduct thorough design and code reviews, establish engineering standards and best practices, and create the conditions for senior and staff-adjacent engineers to do their best work • Drive simplification and platform consolidation—reduce complexity in Keystone AI's go-to-market systems stack, identify opportunities to consolidate overlapping tooling, and architect toward a maintainable, extensible platform that serves sellers reliably • Mentor and sponsor senior engineers, helping them grow in technical scope and organizational influence, and fostering a culture of ownership, craft, and collaboration across the Seller Systems team and beyond Who you are We're looking for someone who meets the minimum requirements to be considered for the role. If you meet these requirements, you are encouraged to apply. The preferred qualifications are a bonus, not a requirement. Minimum requirements • 10+ years experience building software systems, including both experience building user-facing products and internal platforms leveraged by other engineering teams • You have a user-first mindset • You care deeply about the product experience and the users who rely on the systems you build • You've set a multi-year technical strategy for an organization and successfully executed it • You work in ambiguous, fast-moving environments and have a curiosity to learn the domain to a deep level • You've mentored senior engineers and meaningfully empowered their growth • You thrive on a high level of autonomy and responsibility • You have strong collaboration skills to work effectively across multiple teams and stakeholders, and ship complex initiatives • You communicate complex technical topics exceptionally clearly Preferred qualifications • Experience working in high-growth teams similar to Keystone AI • Knowledge of CRM platforms like Salesforce • Previous experience partnering with or supporting Go-to-Market (GTM) organizations, including Sales, Marketing, or Customer Success teams