Principal Software Engineer – Identity & Access Management

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Sezzle

WebsiteLinkedInAll Job Openings

201 - 500 employees

Founded 2016

💳 Fintech

👥 B2C

🛍️ eCommerce

Fintech • B2C • eCommerce

Sezzle is a financial technology company that offers a "buy now, pay later" service, allowing consumers to purchase products and pay for them in four interest-free installments over six weeks. The Sezzle app provides users with a flexible financing alternative to traditional credit cards, enabling instant approval decisions without impacting credit scores. Sezzle partners with various top brands, including Amazon, Walmart, and Target, to offer in-app and in-store payment options. The company's mission is to empower consumers financially by providing more financial freedom and control. It is available as a mobile app, with millions of downloads and high user ratings, and works towards accessibility and inclusion on its platform.

📋 Description

• Own the technical vision and roadmap for Sezzle’s authentication and authorization platform • Architect, design, and build scalable, highly-available auth services and gateway components primarily in Golang • Design and lead phased, zero-downtime migrations of auth traffic and functionality • Establish and evolve authentication and authorization standards across the platform: OAuth2/OIDC flows, token strategy (JWT, opaque, refresh) • Drive consistency and scalability across a distributed microservices architecture • Partner with Security and Compliance to ensure the new platform meets fintech-grade security and regulatory requirements • Establish and evolve engineering best practices for observability, security, and CI/CD across teams • Participate in the on-call rotation for the services you own • 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

🎯 Requirements

• 12+ years of professional software engineering experience • 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 • Proven track record leading a large-scale service extraction or migration • Strong proficiency in Golang, with experience building and maintaining RESTful APIs. • Expertise with SQL-based RDBMS (MySQL, PostgreSQL) and experience optimizing schema and queries for performance at scale. • Solid understanding of distributed systems design patterns • Demonstrated ability to bring new ideas forward, influence decisions, and lead complex technical initiatives across many teams • Demonstrated AI-forward engineering with active use of AI tooling (e.g., Claude Code, Codex, Cursor, or custom LLM integrations) • Bachelor’s degree in Computer Science or a similar technical field (required).

🏖️ Benefits

• Competitive compensation • Fully remote role