Principal Software Engineer (Full Stack, Backend-Focused)

Arcadia is dedicated to happier, healthier days for all. We believe that there is a better healthcare world – one powered by data. Our platform transforms complex, diverse data into a unified foundation for health, helping organizations deliver better care, boost revenue, and lower costs. We’re a team of fiercely driven individuals committed to making healthcare more sustainable—and we’re looking for passionate people to help us get there. For more information, visit arcadia.io. Why This Role Is Important to Arcadia Arcadia’s mission is to improve healthcare outcomes through better data and smarter technology. A critical pillar of this mission is the User Management system, which governs authentication, authorization, and user provisioning across all Arcadia’s applications.   We’re looking for a Principal Software Engineer to take technical ownership of this area—leading the rearchitecture and implementation of a robust, scalable, and secure access control framework. By the time you join, the team will have completed key architectural planning decisions; your focus will be on translating that architecture into reality.   This is a backend-leaning full stack role (approximately 60/40) requiring deep distributed systems expertise and an ability to balance implementation detail with architectural vision. What Success Looks Like In 3 months - Ramp up on the existing User Management system, including authentication (Auth0, SAML 2.0), authorization models, and event-driven user provisioning workflows - Complete design handoff for the new access and grants architecture, collaborating closely with product and platform teams to understand business and security requirements - Begin staged implementation of the new system, focusing on core backend services and foundational APIs In 6 months - Lead the implementation of a database-backed access control framework that replaces legacy patterns and improves performance, consistency, and scalability - Drive integration of new user and access models into key Arcadia applications, ensuring minimal disruption for internal and external users - Collaborate with SRE and infrastructure teams to strengthen IaC, deployment automation, and observability for User Management services In 12 months - Own and operate a fully modernized User Management system that delivers secure, reliable, and high-performance authentication and authorization at scale - Introduce a centralized JWT validation and API gateway strategy to unify access control across services and reduce duplication of logic - Establish technical and operational excellence practices—measurable improvements in reliability, latency, and operational efficiency - Mentor engineers and guide teams across Arcadia in secure, distributed, and scalable system design