Staff Full Stack Engineer - Pay-i

Staff Full Stack Engineer About Pay-i At Pay-i, we are solving one of enterprise AI's most critical challenges: proving ROI of GenAI investments. While global GenAI spend races toward $600B by 2028, 72% of CIOs cite measurement and forecasting as their top blocker, and only 13% of business leaders report significant enterprise-level value from GenAI. We are the only platform that transforms every model call, prompt, and agent step into CFO-grade metrics, providing enterprises the financial transparency to identify winning use cases, optimize costs, and prove impact. Founded by ex-Microsoft leaders with 20+ years of experience each, Pay-i is a seed-stage company backed by five venture capital firms and executive/C-suite angels from Microsoft, Twilio, Zoom, and more. If you are passionate about selling products that fundamentally change how enterprises scale their AI initiatives, join us in bringing the system of record for GenAI ROI to market. The Opportunity As our Staff Full Stack Engineer, you will be a crucial team member working closely with other Full Stack Engineers responsible for implementing our customer’s front-end experience. This is a unique opportunity to build with a deeply experienced team and GenAI leaders who like to innovate, experiment, and respond to customer feedback. What You'll Do Are you excited about building an innovative product that tackles some of the most pressing financial challenges associated with leveraging Generative AI? As our Staff Full Sack Engineer, you will play a pivotal role in our mission. Your efforts will not only shape the user experience across our dashboards, websites, and products but also lay the foundation for our future growth. Core Responsibilities: - Work with Pay-i's front-end and back-end engineers to rapidly deliver both prototype and production-quality products - Create high-quality and enjoyable user experiences by building interfaces that are simple, intuitive, performant, and reliable - Ensure high-quality graphic standards and brand consistency across all customer touchpoints - Implement responsive design principles to ensure seamless display across various devices and screen sizes - Refactor existing code to improve performance, structure, and readability - Utilize state management libraries and patterns (e.g., Redux, Context API) to manage application state efficiently - Implement front-end security best practices, such as input validation and secure coding standards - Implement unit tests, integration tests, and end-to-end tests using appropriate testing frameworks and tools - Perform code reviews and participate in peer code reviews to maintain code quality - Inform our process for ensuring maintainability, quality, and performance of our entire front-end stack What You Bring Required Qualifications: - 7+ years of experience, and insatiable curiosity that has only grown during that time - Deep expertise in modern client Javascript, HTML 5, CSS, and Browser Dev Tools - Practical protocol knowledge of DNS, HTTP, and OAuth2 - Experience with git, bash, Docker, and Python web server development - Excel at working in a fast-paced "bring up/tear down" environment - Comfortable working in ambiguous environments and defining the path forward - Proven experience building external customer-facing products - Self-directed and self-aware, you have strong opinions and a stronger work ethic - Cloud experience (AWS, Azure, and GCP) Preferred Qualifications: - 10+ years of experience - Highcharts, Bootstrap 5+ - Experience building a SPA and/or PWA in Javascript - Full-stack engineering capabilities What We Offer - Top-of-the-line health insurance - Discretionary time off - Opportunity to grow with the company and manage a team - Fast-paced, execution-focused environment with clear goals - Collaboration with and mentoring from an extremely experienced founding team Location - Based in Bellevue, WA - Local, in-office presence preferred - Occasional hybrid arrangements possible W