John Koelndorfer

Skilled technologist and purveyor of fine automation
  • Linux
  • DevOps
  • Python
  • AWS
  • GCP
  • Docker
  • Kubernetes
  • Terraform
  • Networking
  • Security
  • Automation
  • Shell
Lead Infrastructure Engineer
BigCommerce
May 2022 — Present
  • 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.
  • Lead 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.
  • Rolled out standard application monitoring, alerting, and observability built on Sensu, PagerDuty, and AWS CloudWatch.
  • 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.
  • Mentored software engineers in infrastructure and cloud engineering.
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.
  • Mentored junior developer in software engineering and testing best practices.
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