Principal Infrastructure Engineer

Sezzle

. Design, build, operate, and scale the platform that powers Sezzle .

Posted 11/2/2026full-timeRemoteLead💰 $12,500 - $20,800 per monthWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates extensive expertise in AWS and Kubernetes for building and scaling resilient infrastructure, with strong capabilities in automation, disaster recovery, and observability. Proven track record in delivering infrastructure improvements and managing high-availability platforms with a focus on performance and cost efficiency.

Highest-signal resume keywords

AWS Infrastructure DesignKubernetes ManagementRDS/Aurora OptimizationInfrastructure-as-Code with TerraformIncident Response and Recovery

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

AWSKubernetesRDSAuroraGolangPythonTerraformLinuxNetworkingDistributed Systems

Soft Skills

CollaborationProblem-SolvingCommunication

Tools & Technologies

AI ToolingObservability ToolsLoad Testing ToolsCI/CD Practices

Certifications & Qualifications

Bachelor's Degree in Computer Science

Industry Keywords

Infrastructure ScalingHigh-Availability PlatformsDisaster RecoveryCapacity PlanningCloud Cost Efficiency

Tech Stack

Tools & technologies

AWSCloudDNSKubernetesLinuxMySQLPostgresPythonTerraformGo

About the role

Key responsibilities & impact

Design, build, operate, and scale the platform that powers Sezzle
Own complex infrastructure initiatives from architecture and prototyping through implementation, production rollout, and ongoing operation
Identify system limits and implement improvements supporting increased traffic, data volume, and workload complexity
Build capacity models, run load and stress tests, diagnose bottlenecks, and validate throughput, latency, saturation, and cost improvements
Design resilient AWS account, IAM, network, and service architectures
Build and operate the Kubernetes platform, including lifecycle automation, workload isolation, resource allocation, autoscaling, upgrades, and deployment reliability
Scale and optimize Aurora RDS for MySQL and Postgres, including queries, indexes, connections, replication, failover, schema changes, and migrations
Define service-level objectives and error budgets; implement failure isolation, backpressure, load shedding, and safe retries
Participate in on-call and lead technical recovery during serious incidents
Design and test disaster recovery, backup, restore, and failover mechanisms
Build infrastructure-as-code, provisioning, deployment, upgrade, and recovery automation
Improve observability through metrics, logs, traces, dashboards, and actionable alerts
Deliver safe infrastructure migrations with phased rollouts, validation, and rollback paths
Improve cloud cost efficiency through resource right-sizing, utilization, autoscaling, and storage optimization
Build and evaluate AI-assisted tooling for incident investigation, runbooks, anomaly analysis, and operational automation
Write architecture proposals, evaluate technology tradeoffs, review shared-infrastructure changes, and document system operation and failure

Requirements

What you’ll need

Bachelor's degree in Computer Science or a similar technical field (required)
12+ years of experience across infrastructure, platform, site reliability, software development, or related engineering disciplines
Deep production expertise with AWS, including compute, IAM, multi-account architectures, VPC design, and private connectivity
Deep production expertise with Kubernetes, including cluster lifecycle, scheduling, resource management, autoscaling, networking, and troubleshooting
Deep expertise with RDS/Aurora for MySQL and/or Postgres at scale
Track record of personally delivering infrastructure scaling improvements
Strong coding and automation skills using Golang, Python, or similar languages
Infrastructure-as-code experience with Terraform or equivalent
Strong systems fundamentals including Linux, networking, DNS, TLS, storage, concurrency, and distributed-system failure modes
Experience operating a 24/7 high-availability platform with direct customer or revenue impact
Willingness to participate in an on-call rotation
Experience with hands-on incident response and postmortem remediation
Experience implementing and testing disaster recovery against defined recovery objectives
Practical experience with observability, load testing, capacity planning, and safe CI/CD practices
Active use of AI tooling in engineering or operations
Ability to carry ambiguous technical problems through production delivery and collaborate across engineering disciplines

Benefits

Comp & perks

Competitive gross monthly compensation
Remote work arrangement
Opportunity to work with innovative fintech and retail technology
Open-source-focused engineering environment