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, 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. • Establish and evolve authentication and authorization standards across the platform. • Drive consistency and scalability across a distributed microservices architecture while maintaining performance and reliability. • Partner with Security and Compliance to meet 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, and help lead incident response and postmortems. • 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, 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. • 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 and the specific challenges of high-throughput, low-latency edge services. • Demonstrated ability to bring new ideas forward, influence decisions, and lead complex technical initiatives across many teams. • Demonstrated AI-forward engineering: actively use AI tooling in your development work today.

🏖️ Benefits

• Competitive compensation • Fully remote role • No relocation or commute required