Principal Infrastructure Engineer

Sezzle

. Design, build, operate, and scale the platform powering Sezzle .

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

Core Competencies

Role fit

Core Competencies

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Demonstrates extensive expertise in AWS architecture, Kubernetes management, and RDS/Aurora database optimization, with a strong focus on infrastructure scaling and automation. Proven ability to lead complex technical initiatives and improve system reliability through effective incident response and disaster recovery strategies.

Highest-signal resume keywords

AWS Architecture ExpertiseKubernetes ManagementRDS/Aurora OptimizationInfrastructure-As-Code with TerraformIncident Response Leadership

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

AWSKubernetesRDSAuroraGolangPythonTerraformLinuxNetworkingDistributed Systems

Soft Skills

CollaborationProblem-SolvingLeadership

Tools & Technologies

PrometheusGrafanaLokiTempoAI Tooling

Certifications & Qualifications

Bachelor's Degree in Computer Science

Industry Keywords

FintechPaymentsBankingHigh-Availability PlatformsDisaster Recovery

Tech Stack

Tools & technologies

AWSCloudDNSGrafanaKubernetesLinuxMySQLPostgresPrometheusPythonTerraformGo

About the role

Key responsibilities & impact

Design, build, operate, and scale the platform powering Sezzle
Own complex technical initiatives from architecture and prototyping through implementation, production rollout, and ongoing operation
Identify system limits and implement infrastructure improvements for increasing traffic, data volume, and workload complexity
Build capacity models, run load and stress tests, and diagnose compute, networking, Kubernetes, and database bottlenecks
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 rotation 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 eliminate manual work
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 engineers, 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
Deep production expertise with AWS, including compute, IAM, multi-account architectures, networking, 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 in Linux, networking, DNS, TLS, storage, concurrency, and distributed-system failure modes
Experience operating 24/7 high-availability platforms with hands-on incident response and postmortem remediation
Willingness to participate in an on-call rotation
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
Preferred: fintech, payments, or banking experience; multi-region architectures; chaos engineering; Prometheus, Grafana, Loki, Tempo; internal platform capabilities; AI-assisted operational automation

Benefits

Comp & perks

Competitive gross monthly compensation
Opportunity to work with cutting-edge fintech, payment, and retail technology
Remote work (job tagged #Li-remote)
Collaboration with international teams and technical domains
Exposure to AI-assisted infrastructure and SRE tooling
Open-source-focused technology environment
Employee culture involving musicians, yogis, cyclists, chefs, golfers, dog-lovers, and rock-climbers