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Principal Infrastructure Engineer

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Principal Infrastructure Engineer in Remote new

  • Poland

Responsibilities

  • Own the architecture and evolution of core infrastructure as traffic, data volume, and workload complexity grow.
  • Build capacity models, conduct load and stress tests, and improve throughput, latency, saturation, reliability, and cost efficiency.
  • Design resilient AWS account, IAM, networking, multi-AZ, and multi-region architectures.
  • Operate and improve the Kubernetes platform, including cluster lifecycle, workload isolation, 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 and implement failure isolation, backpressure, load shedding, and safe retries.
  • Participate in on-call rotations and lead technical recovery from serious incidents and outages.
  • Design, test, and document disaster recovery, backup, restore, and failover mechanisms.
  • Build infrastructure-as-code, deployment automation, observability, migration, rollback, and cost-optimization capabilities.
  • Build and evaluate AI-assisted operational tooling for investigation, runbooks, anomaly analysis, and toil reduction.
  • Write architecture proposals, benchmark alternatives, review shared-infrastructure changes, and document system behavior and failure modes.

Requirements

  • Bachelor’s degree in Computer Science or a similar technical field is 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; EKS is strongly preferred.
  • Deep experience with relational databases at scale, specifically RDS/Aurora with MySQL and/or Postgres.
  • Demonstrated personal delivery of infrastructure scaling improvements with measurable capacity, latency, reliability, or cost gains.
  • Strong coding and automation skills using Golang, Python, or similar languages, plus Terraform or equivalent infrastructure-as-code experience.
  • Strong systems fundamentals in Linux, networking, DNS, TLS, storage, concurrency, and distributed-system failure modes.
  • Experience operating 24/7 high-availability platforms, responding to incidents, and implementing postmortem remediation.
  • Experience with disaster recovery, observability, load testing, capacity planning, and safe CI/CD practices.
  • Active use of AI tooling in engineering or operations with the ability to verify generated code, recommendations, and actions.
  • Ability to resolve ambiguous, system-wide technical problems across engineering disciplines.
  • Preferred experience includes fintech, payments, or banking; multi-region architectures; chaos engineering; failure testing; Prometheus, Grafana, Loki, or Tempo; internal platforms; self-service tooling; progressive delivery; and AI-assisted incident automation.

Benefits

  • Full-time remote position.
  • Monthly gross compensation range of $12,500–$20,800 USD based on location and experience.
  • Opportunities to work on infrastructure supporting fintech and payment workloads at scale.
  • Company culture includes employees with interests such as music, yoga, cycling, cooking, golf, dogs, and rock climbing.

Sezzle

Sezzle builds a buy now, pay later platform that lets consumers split purchases into interest-free installments online and in stores, integrated with e-commerce and retail merchants. The company earns revenue from merchant fees and related consumer charges and provides underwriting and payment pr...

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