John Koelndorfer

Skilled technologist and purveyor of fine automation
  • Linux
  • DevOps
  • Python
  • AWS
  • GCP
  • Docker
  • Kubernetes
  • Terraform
  • Networking
  • Security
  • Automation
  • Shell
Lead Cloud Engineer
Target
May 2025 — Present
  • Optimized cloud spend by pinpointing a critical cost outlier and spearheading a cross-functional initiative to decommission, resulting in $34,000 per month in savings
  • Evangelized Terraform best practices within the team by leading learning sessions and writing internal blog posts
  • Championed architectural improvements for public cloud API, eliminating thousands of hours of developer toil yearly and $2,000 per month in cloud spend
  • Provisioned GKE, Argo CD, and Crossplane in a new data compliance environment while navigating ambiguous requirements, high complexity, and outdated documentation
Lead Infrastructure Engineer
BigCommerce
May 2022 — Mar 2025
  • Set technical direction for Google Cloud Platform-powered cloud development environment, enabling over 200 software engineers to run a scaled-down version of BigCommerce’s 40+ service platform.
  • Drove resolution for inter-service and infrastructure issues in support of software engineering.
  • Reduced ongoing cost of cloud development environment by 35%.
  • Improved developer tooling reliability, reducing engineering time lost from more than 2400 FTE-hours/year to less than 240 FTE-hours/year.
  • Led project to to revamp cloud development environment enabling horizontal scalability, additional functionality, further improvements to reliability and cost, and reducing cloud dev maintenance effort by significantly slashing codebase size.
  • Built fully Terraformed, secure, CI-deployable Kubernetes cluster in just three days to support BigCommerce’s internal AI project.
Lead Infrastructure Engineer
AerisWeather
Jan 2019 — May 2022
  • Led AerisWeather’s cloud infrastructure & DevOps strategy on AWS.
  • Spearheaded AWS cost savings project, resulting in a 30% reduction of ongoing cloud operating costs.
  • Instituted standard CI pipelines, Terraform modules, and Ansible provisioning to provide secure, cost-effective, highly available deployments by default, saving weeks in setup and maintenance effort per service.
  • Built AerisWeather webhooks product using Python, AWS Lambda, SQS, and S3, which grew to over $200,000 annual recurring revenue in 2021.
  • Revamped pwsweather.com’s data ingestion platform to improve reliability, enabling receipt of more than ten million weather station updates (over 100 million data points) every hour.
Site Reliability Engineer
NovuHealth, Inc.
Mar 2018 — Nov 2018
  • Designed and implemented infrastructure functionality for Novu’s AWS-hosted platform using Chef and CloudFormation.
  • Revamped SFTP file delivery service, increasing performance by more than 2x.
  • Containerized and deployed MicroStrategy software to Amazon ECS.
  • Served as tier 3 on-call support for the Novu infrastructure.
Senior Software Engineer
Calix, Inc.
Nov 2016 — Mar 2018
  • Designed and implemented automated Python tests running 300+ tests per day on 10+ models of Calix residential network hardware.
  • Unified test codebases by implementing a driver pattern, resulting in accelerated feature development, improved reliability, lowered maintenance cost, and enhanced troubleshooting capabilities.
  • Architected and implemented ONT image signing process to enable secure updates for residential network hardware in the field.
Infrastructure Engineer
Zipnosis, Inc.
May 2015 — Nov 2016
IT Engineer
General Mills, Inc.
Dec 2011 — May 2015
Linux Systems Administrator
University of Minnesota
May 2008 — Dec 2011

University of Minnesota

  • D. F. Kune, J. Koelndorfer, N. Hopper, Y. Kim, “Location Leaks on the GSM Air Interface”, NDSS Symposium, 2012.
University of Minnesota, Twin Cities
2011
Bachelor of Science, Computer Science