Principal Infrastructure Engineer

Sezzle

. Design, build, operate, and scale the platform powering Sezzle's interest-free installment payments and shopping experience .

Posted 11/2/2026full-timeRemote • Colombia, France, Germany, Netherlands, TurkeyLead💰 $12,500 - $20,800 per monthWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates extensive expertise in designing and operating scalable infrastructure, particularly with AWS and Kubernetes, while implementing automation and observability practices. Proven ability to enhance performance, reliability, and cost efficiency through strategic infrastructure improvements and incident management.

Highest-signal resume keywords

AWS Infrastructure DesignKubernetes Platform 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

Infrastructure DesignAWSKubernetesRDSAuroraGolangPythonTerraformLoad TestingDisaster Recovery

Soft Skills

CollaborationProblem-SolvingCommunicationLeadership

Tools & Technologies

EKSAI ToolingCI/CD PracticesMonitoring Dashboards

Certifications & Qualifications

Bachelor's Degree in Computer Science

Industry Keywords

Site Reliability EngineeringHigh-Availability PlatformsInfrastructure ScalingOperational AutomationObservability

Tech Stack

Tools & technologies

AWSCloudDNSKubernetesLinuxMySQLPostgresPythonTerraformGo

About the role

Key responsibilities & impact

Design, build, operate, and scale the platform powering Sezzle's interest-free installment payments and shopping experience
Own complex infrastructure initiatives from architecture and prototyping through implementation, production rollout, and ongoing operation
Identify system limits and implement improvements for increasing traffic, data volume, and workload complexity
Connect business workflows to infrastructure, application, and data behavior to improve performance, reliability, and cost efficiency
Build capacity models, run load and stress tests, diagnose bottlenecks, and validate 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 and instrument 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 and outages
Design, test, and document disaster recovery, backup, restore, and failover mechanisms
Build infrastructure-as-code and operational automation to make provisioning, deployments, upgrades, and recovery reproducible
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 repetitive operations
Write architecture proposals, evaluate technology tradeoffs, review shared-infrastructure changes, and document system operation and failure
Report to engineering leadership and collaborate with application engineering, Security, and Compliance

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
Substantial hands-on experience designing and operating production infrastructure at scale
Deep production expertise with AWS, including compute, IAM, multi-account architectures, VPC design, and private connectivity
Deep production expertise with Kubernetes; EKS experience strongly preferred
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 of $12,500–$20,800 USD based on location and experience
Remote work (job posting includes #Li-remote)
Open-source-focused technology environment