Principal Software Engineer (Full Stack, Backend-Focused)

Arcadia is dedicated to improving healthcare outcomes through better data and smarter technology. They are seeking a Principal Software Engineer to lead the rearchitecture and implementation of their User Management system, focusing on creating a robust access control framework that enhances security and scalability.

Responsibilities:

• Leading the rearchitecture and implementation of the User Management platform—the foundation for authentication, authorization, and access control across Arcadia products
• Building backend services and APIs (NestJS, TypeScript, PostgreSQL) supporting secure, multi-tenant access models
• Designing distributed, event-driven systems to synchronize user data and access events across Arcadia applications
• Driving modernization of existing authentication and provisioning flows (Auth0, SAML 2.0, OAuth2, JWT)
• Managing cloud infrastructure through Infrastructure-as-Code (Terraform) and AWS-native services (ECS, S3, SNS, Aurora)
• Defining SLOs and designing telemetry for key features, ensuring robust monitoring, canary, and standard rollout strategies
• Partnering with cross-functional stakeholders—including Product, Security, and SRE—to ensure alignment between technical execution and organizational priorities
• Providing leadership, mentorship, and clarity in complex, ambiguous problem spaces
• Joining the engineering on-call rotation, contributing to the reliability and operational excellence of the User Management platform and related services
• Ensuring that documentation, operational runbooks, and best practices are well maintained and available for peers and downstream teams

Requirements:

• 10+ years of professional full-stack software engineering experience with a focus on backend and distributed systems
• Proven success building and scaling identity and access management systems, including authentication (SAML 2.0, OAuth2, JWT) and fine-grained authorization frameworks
• Expertise in TypeScript, Node.js/NestJS, and modern React/Angular development for full stack delivery
• Strong command of cloud architecture (AWS preferred) and IaC practices with Terraform
• Deep experience with relational and NoSQL data stores, designing for vertical & horizontal scalability and high availability
• Demonstrated ability to own complex systems from design through rollout and post-release operation, with strong attention to quality and reliability
• Excellent collaboration skills and the ability to work across engineering, product, and SRE teams to deliver cohesive, secure systems
• Strong communication and architectural reasoning skills—able to balance pragmatism with long-term technical health
• Passion for mission-driven work improving healthcare outcomes and enabling data-driven care delivery
• Experience modernizing identity and access systems or other critical, cross-cutting platform services
• Familiarity with API gateway design, centralized JWT validation, and event-driven architectures
• Exposure to data streaming or message-driven systems (Kafka, Kinesis, SNS/SQS)
• Experience in healthcare technology, HIPAA compliance, or other regulated data environments
• Polyglot engineering experience—comfort working across multiple languages and frameworks (e.g., Python, Java, Go) when solving complex distributed system challenges
• Experience working with high-scale analytics platforms or distributed data processing frameworks (e.g., Apache Spark jobs), especially in environments integrating operational and analytical data pipelines