Principal Infrastructure Engineer

Sezzle is seeking a Principal Infrastructure Engineer to design, build, operate, and scale the platform. The role focuses on increasing throughput, reducing latency, removing capacity bottlenecks, strengthening resilience, and automating production operations. The stack runs on AWS with Kubernetes and Aurora RDS (MySQL and Postgres). The engineer will own complex technical initiatives, participate in on-call rotation, and build AI-assisted infrastructure tooling. The role reports to engineering,

Bachelor's degree in Computer Science or similar technical field required. 12+ years of experience across infrastructure, platform, SRE, or software development. Deep expertise with AWS, Kubernetes in production, and relational databases at scale (Aurora RDS MySQL/Postgres). Strong coding skills in Golang or Python, infrastructure-as-code with Terraform. Systems fundamentals: Linux, networking, DNS, TLS. Experience with on-call, incident response, disaster recovery, observability, load testing,