Principal Software Engineer - Identity & Access Management

Overview

Principal Software Engineer to own and lead the evolution of authentication and authorization for Sezzle’s platform.

What you'll do

• Own the technical vision, roadmap, and migration strategy for the authentication and authorization platform.
• Design, develop, and deliver an API auth gateway and identity services.
• Architect and build scalable, highly available auth services and gateway components.
• Lead phased, zero-downtime migrations with rollback and safety mechanisms.
• Establish authentication/authorization standards (OAuth2/OIDC, token strategy, RBAC/ABAC, policy engines).
• Partner with Security and Compliance to meet security and regulatory requirements.
• Participate in on-call and help lead incident response and postmortems for owned services.

What you'll need

• 12+ years of professional software engineering experience, including significant backend experience.
• Deployed significant changes to a production application in the past 30 days.
• Hands-on expertise in authentication and authorization (OAuth2, OpenID Connect, SAML, JWT, session-based auth, token lifecycle, RBAC/ABAC).
• Experience designing, building, or operating an API gateway or auth proxy at scale.
• Strong proficiency in Golang and experience building RESTful APIs.
• SQL RDBMS expertise (MySQL, PostgreSQL) with performance optimization.
• Required bachelor’s degree in Computer Science or a similar technical field.

Details

• Location: Argentina (Remote).
• Work mode: Fully remote.