Principal Cloud & SRE Architect — Scale & Resilience

Sezzle; Tandil; On-site; ARS 215,584,000 - 358,732,000; Full time

Job summary

Sezzle is seeking a Principal Infrastructure Engineer to design, build, operate, and scale the platform powering Sezzle. You will own complex initiatives from architecture through production, focusing on throughput, latency, resilience, and automation in a cloud-native environment.

Our stack uses AWS, Kubernetes, Aurora RDS; you will write code and infrastructure-as-code, participate in on-call, and contribute to AI-assisted tooling while aligning with business goals and cost efficiency.

Qualifications

• Bachelor's degree in Computer Science or a similar technical field.
• 12+ years of experience across infrastructure, platform, SRE, or related engineering.
• Deep expertise with AWS production workloads and networking.
• Strong coding and automation skills with Golang/Python.

Responsibilities

• Own the technical architecture and evolution of core infrastructure; identify limits and implement improvements.
• Connect business understanding to system improvements across production workloads.
• Engineer for scale and performance; run load tests and diagnose bottlenecks.
• Design and build AWS infrastructure; address quotas and multi-AZ/region needs.
• Build and operate the Kubernetes platform; automate lifecycle and deployment reliability.
• Scale and optimize Aurora RDS for MySQL and Postgres; tune performance and backups.
• Improve reliability through service-level objectives and error budgets.
• Participate in on-call rotation and drive incident recovery.
• Implement and test disaster recovery and failover mechanisms.
• Build infrastructure-as-code and automation to reduce toil.
• Build observability to diagnose production issues with dashboards and alerts.
• Deliver safe migrations with rollback paths and phased rollouts.
• Improve cloud cost efficiency through tuning and resource optimization.
• Build and evaluate AI-assisted operational tooling with auditable controls.
• Make technical decisions clear and executable with architecture proposals.

Skills

Golang

Python

Automation

Incident response

Cloud architecture

Education

Bachelor's degree in Computer Science or similar

Tools

AWS

Kubernetes

Aurora RDS (MySQL/Postgres)

Terraform

Git/GitLab

Job description

Sezzle is seeking a Principal Infrastructure Engineer to design, build, operate, and scale the platform powering Sezzle. You will own complex initiatives from architecture through production, focusing on throughput, latency, resilience, and automation in a cloud-native environment.

Our stack uses AWS, Kubernetes, Aurora RDS; you will write code and infrastructure-as-code, participate in on-call, and contribute to AI-assisted tooling while aligning with business goals and cost efficiency.