Principal Infrastructure Engineer

This is a fully remote position, open to applicants in Mexico.

📋 Description

• Design, develop, manage, and enhance Sezzle’s infrastructure platform.

• Take ownership of intricate technical projects from architecture and prototyping to implementation, deployment, and ongoing management.

• Recognize system constraints and implement enhancements to handle traffic, data volume, and workload complexity.

• Create capacity models, conduct load and stress tests, identify bottlenecks, and confirm improvements in throughput, latency, saturation, and costs.

• Architect resilient AWS accounts, IAM configurations, networks, and service architectures.

• Construct and maintain Kubernetes clusters, including lifecycle automation, workload segregation, resource allocation, autoscaling, upgrades, and deployment reliability.

• Scale and optimize Aurora RDS for MySQL and Postgres, focusing on queries, indexes, connections, replication, failover, schema modifications, and migrations.

• Establish service-level objectives and error budgets; implement failure isolation, backpressure, load shedding, and safe retry mechanisms.

• Engage in on-call duties and lead technical recovery efforts during critical incidents and outages.

• Design and assess disaster recovery strategies, backups, restores, and failover procedures to meet recovery objectives.

• Develop infrastructure-as-code and operational automation solutions.

• Enhance observability through metrics, logs, traces, dashboards, and alert systems.

• Facilitate safe infrastructure migrations via phased rollouts, validation, and rollback strategies.

• Optimize cloud cost efficiency through resource sizing, utilization, autoscaling, and storage optimization.

• Develop and assess AI-assisted operational tools.

• Draft architectural proposals, evaluate technology trade-offs, review shared-infrastructure modifications, and document system operations and failure modes.

• Collaborate with application engineering, security, compliance, and engineering leadership teams.

⛳️ Requirements

• A Bachelor's degree in Computer Science or a related technical discipline (mandatory).

• Over 12 years of experience in infrastructure, platform, site reliability, software development, or equivalent engineering fields.

• Extensive production experience with AWS, including compute, IAM, multi-account architectures, VPC design, and private connectivity.

• Significant production expertise with Kubernetes; experience with EKS is highly preferred.

• In-depth knowledge of RDS/Aurora for MySQL and/or Postgres.

• Proven track record of implementing infrastructure scaling improvements.

• Proficient coding and automation abilities in Golang, Python, or similar programming languages.

• Experience with infrastructure-as-code using Terraform or equivalent tools.

• Strong understanding of systems fundamentals including Linux, networking, DNS, TLS, storage, concurrency, and distributed-system failure modes.

• Experience in operating 24/7 high-availability platforms.

• Willingness to be part of an on-call rotation.

• Experience in implementing and testing disaster recovery plans.

• Hands-on experience with observability, load testing, capacity planning, and safe CI/CD practices.

• Active engagement with AI tools in engineering or operations.

• Ability to navigate ambiguous technical challenges through production delivery and collaborate across various engineering disciplines.

• Preferred: experience in fintech, payments, or banking; knowledge of multi-region architectures; chaos engineering; familiarity with Prometheus, Grafana, Loki, Tempo; internal platform capabilities; and AI-assisted incident investigation or operational automation.

🏝️ Benefits

• Competitive gross monthly compensation ranging from $12,500 to $20,800 USD.

• An engineering environment focused on open-source development.

• Opportunity for remote work within Mexico / Latin America.