Principal Infrastructure Engineer, Sezzle

• We are seeking a talented and motivated best-in-class Principal Engineer with a focus on Infrastructure
• You should consider yourself a DOer to be a good fit for this role. We expect you to bring a deep well of experience to play, and with AI tooling, you should be a large force for scaling in the organization
• 15+ years of professional software engineering or infrastructure engineering experience, including significant backend development and production engineering experience
• Deployed significant changes to a production application or infrastructure configuration in the past 30 days
• Strong proficiency in Golang, with experience building and maintaining RESTful APIs
• Deep expertise with SQL-based RDBMS (MySQL, PostgreSQL) and experience optimizing schema and queries for performance at scale
• Solid understanding of distributed systems design patterns (e.g., transactional outbox, event-driven architecture and stream processing, queues)
• Demonstrated ability to bring new ideas forward, influence decisions, and lead complex technical initiatives
• Bachelor’s degree in Computer Science or equivalent practical experience
• You have relentlessly high standards - many people may think your standards are unreasonably high. You are continually raising the bar and driving those around you to deliver great results. You make sure that defects do not get sent down the line and that problems are fixed so they stay fixed
• You’re not bound by convention - your success—and much of the fun—lies in developing new ways to do things
• You need action - speed matters in business. Many decisions and actions are reversible and do not need extensive study. We value calculated risk-taking
• You earn trust - you listen attentively, speak candidly, and treat others respectfully
• You have backbone; disagree, then commit - you can respectfully challenge decisions when you disagree, even when doing so is uncomfortable or exhausting. You have conviction and are tenacious. You do not compromise for the sake of social cohesion. Once a decision is determined, you commit wholly
• You deliver results - you focus on the key inputs and deliver them with the right quality and in a timely fashion. Despite setbacks, you rise to the occasion and never settle

Desirable

• This role presents an exciting opportunity to thrive in a dynamic, fast-paced environment within a rapidly growing team, with abundant prospects for career advancement
• This is a hybrid role with a high degree of autonomy and authority to identify and resolve problems you see in our infrastructure, deployments, repositories, operational workload, and overall systems
• Architect, upgrade, design, and build scalable infrastructure solutions leveraging Kubernetes, AWS, RDS (MySQL/Postgres), and modern distributed patterns
• Help drive the infrastructure and engineering teams’ roadmaps, leading us to higher levels of reliability, recoverability, and scalability
• Find and fix issues across our systems before they become issues in production, through tooling, alerts, AI, collaboration with teams, whatever it takes
• Drive capacity planning, benchmarking, and work with the team to stress test our systems, find bottlenecks, and prepare for further growth in the business
• Define, maintain and enforce SLAs and alerts across our infrastructure
• Help Lead Sezzle’s AI enablement efforts, identifying opportunities to apply AI and automation to enhance infrastructure reliability, developer productivity, and internal tooling
• Build in consistency and scalability across a distributed microservices architecture while maintaining performance and reliability
• Establish and evolve engineering best practices for observability, security, and CI/CD across teams
• 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