Principal Infrastructure Engineer

Stack

Responsibilities

• ▹Design, build, operate, and scale the infrastructure powering Sezzle's platform
• ▹Increase throughput, reduce latency, remove capacity bottlenecks, and strengthen resilience
• ▹Own complex technical initiatives from architecture and prototyping through production rollout and ongoing operation
• ▹Write code and infrastructure-as-code, debug production systems
• ▹Participate in on-call rotation and take a hands-on role in recovering from major incidents, including full outages
• ▹Form and test hypotheses using logs, metrics, and traces, making mitigation decisions under incomplete information
• ▹Turn incident findings into lasting engineering fixes
• ▹Build and apply AI-assisted infrastructure and SRE tooling for incident investigation, capacity analysis, and runbook automation

Requirements

• ▹12+ years of experience
• ▹Deep knowledge of AWS, Kubernetes-orchestrated workloads, and Aurora RDS (MySQL and Postgres)
• ▹Comfort moving between cloud architecture, networking, cluster internals, database performance, and application behavior
• ▹Experience writing code and infrastructure-as-code, debugging production systems

Soft skills

About the company

Sezzle is a fintech company reinventing the shopping experience with interest-free installment plans, on a mission to financially empower the next generation.