Principal Software Engineer - Identity & Access Management

About this role

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Skills you'll use

What you'll do

• Own the technical vision and roadmap for Sezzle’s authentication and authorization platform, including a dedicated API auth gateway and supporting identity services.
• Architect, design, and build scalable, highly-available auth services and gateway components primarily in Golang , leveraging AWS , RDS (MySQL/Postgres) , and modern distributed patterns.
• Design and lead phased, zero-downtime migrations of auth traffic and functionality, with clear rollback and safety mechanisms at every step.
• Establish and evolve authentication and authorization standards across the platform: OAuth2/OIDC flows, token strategy (JWT, opaque, refresh), service-to-service auth (mTLS, workload identity), and fine-grained authorization models (RBAC/ABAC/policy engines).
• Drive consistency and scalability across a distributed microservices architecture while maintaining the performance, reliability, and latency budgets expected of an edge gateway.
• Partner with Security and Compliance to ensure the new platform meets fintech-grade security and regulatory requirements , and champion secure-by-default patterns across engineering.
• Establish and evolve engineering best practices for observability, security, and CI/CD across teams, with particular rigor on the auth-critical path.
• Participate in the on-call rotation for the services you own, and help lead incident response and postmortems on the auth-critical path.
• Mentor engineers and champion a culture of learning, innovation, and operational excellence.
• Collaborate cross-functionally to translate business goals into technical roadmaps and deliver results that matter.

Who can apply

• Mentor engineers and champion a culture of learning, innovation, and operational excellence.
• Collaborate cross-functionally to translate business goals into technical roadmaps and deliver results that matter.
• 12+ years of professional software engineering experience, including significant backend experience.
• Deployed significant changes to a production application in the past 30 days.
• Deep, hands-on expertise in authentication and authorization systems : OAuth2, OpenID Connect, SAML, JWT and session-based auth, token lifecycle management, and modern authorization patterns (RBAC, ABAC, policy-as-code).
• Experience designing, building, or operating an API gateway or auth proxy at scale : whether a commercial/open-source gateway (e.g., Kong, Envoy, AWS API Gateway, Traefik) or an in-house edge service.
• Proven track record leading a large-scale service extraction or migration : decomposing a monolith or large legacy service into well-bounded services with zero or minimal customer impact.
• Strong proficiency in Golang , with experience building and maintaining RESTful APIs .

About Sezzle

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