Owner
2016 - PRESENTlenart.io- Trained over a thousand professionals on cloud technologies.
- Designed, built, troubleshot, and fixed dozens of Kubernetes clusters.
- Communicated with spacecraft on another planet, and have software running on the International Space Station.
Technologies: Kubernetes, Google Cloud Platform (GCP), Terraform, Helm, Docker, Linux, Debian, Bash, C++, Git, Python, Ubuntu, PostgreSQL, Go, Lua, Debian Linux, Ubuntu Linux, MySQL, Google Container Engine, Standard Template Library (STL), Concurrent Programming, Software Development, DevOps, Nginx, Continuous Integration (CI), Continuous Delivery (CD), Cloud Infrastructure, Site Reliability Engineering (SRE), OAuth, Infrastructure as Code (IaC), OpenID, Cloud, Cloud Architecture, Distributed Systems, GNU MakeDeveloper
2000 - PRESENTDebian- Packaged and maintained the official Kubernetes packages for Debian Linux.
- Updated and maintained the tar package (a core Linux tool, and one of the few essential packages in Debian).
- Onboarded and mentored new Debian maintainers, working as an application manager.
Technologies: Debian, Linux, C, C++, Bash, AutoTools, Git, dpkg, Kubernetes, GNU Make, Perl, Software Development, Debian Linux, DockerSite Reliability Engineer
2013 - 2016Google, Inc.- Built automation for highly reliable (4 9s) MySQL database clusters of thousands of computers, providing the back end for services like YouTube.
- Designed and maintained backup, monitoring, scaling, and provisioning systems.
- Served as an on-call engineer for mission-critical database back ends.
- Interviewed engineer candidates over the phone and on-site.
Technologies: Go, C++, Python, Distributed Systems, MySQL Clustering, Borg, Blaze, Vitess, Linux, Debian, Bash, C, Git, Ubuntu, Flask, Debian Linux, Ubuntu Linux, MySQL, Standard Template Library (STL), Concurrent Programming, Software Development, DevOps, Continuous Integration (CI), Continuous Delivery (CD), Cloud Infrastructure, Site Reliability Engineering (SRE), Infrastructure as Code (IaC), Cloud, Cloud ArchitectureAssociate Lecturer
2007 - 2011Eötvös Loránd University- Taught C++, networking, Linux system administration, and mathematics.
- Managed Linux servers for the ELTE Institute of Mathematics.
- Conducted examinations for undergraduate students on various topics.
Technologies: Mathematics, Computer Science, Postfix, Exim4, Dovecot, NFS, Samba, RAID, Linux, Debian, C, C++, PostgreSQL, Debian Linux, MySQL, Standard Template Library (STL), Software Development, Bash, GNU Make
Janos Lenart
Site Reliability Engineering (SRE) Developer in Manchester, United Kingdom
Member since June 25, 2017
Janos is an ex-Googler who builds, fixes, and teaches various technologies. He specializes in Linux, clusters (especially Kubernetes), cloud technologies, distributed systems, big data, including database design and clustering, programming in C/C++ and Go.
Janos is now available for hire
Portfolio
- lenart.ioKubernetes, Google Cloud Platform (GCP), Terraform, Helm, Docker, Linux...
- DebianDebian, Linux, C, C++, Bash, AutoTools, Git, dpkg, Kubernetes, GNU Make, Perl...
- Google, Inc.Go, C++, Python, Distributed Systems, MySQL Clustering, Borg, Blaze, Vitess...
Experience
- Linux 20 years
- C++ 15 years
- Site Reliability Engineering (SRE) 7 years
- DevOps 7 years
- Google Cloud Platform (GCP) 6 years
- Docker 6 years
- Kubernetes 6 years
- MySQL Clustering 3 years
Availability
Part-time
Preferred Environment
Debian Linux, Kubernetes, Google Cloud Platform (GCP)
The most amazing...
...infrastructure I've worked with is the single largest cluster on the planet.
Employment
Experience
- Terminal for Kubernetes Dashboardhttps://github.com/kubernetes/dashboard/pull/1939
Kubernetes is the leading technology for container orchestration. Kubernetes dashboard is the de facto UI used with it. I've added the feature that lets you execute shells in the containers from that UI.
- Private GKE Cluster Support for Terraformhttps://github.com/hashicorp/terraform-provider-google/pull/1250
I implemented support for private GKE clusters in the GCP Terraform provider; it is now merged into a mainline.
I was working on a larger project for a medical support organization and this was a side project. They required GKE provisioned with Terraform and no external IPs. Private clusters were in beta at the time and Terraform did not support them yet. - GCP Cloud DNS Support for acme.shhttps://github.com/acmesh-official/acme.sh/pull/1623
acme.sh automates the issuance and renewal of X.509 certificates (SSL/TLS/HTTPS) using LetsEncrypt. This contribution added the Google Cloud DNS validation back end.
I wrote acme.sh in pure shell which makes it a preferable solution in some environments.
Skills
Languages
Bash, Python, Go, Lua, C, C++, PerlTools
GNU Make, Postfix, AutoTools, Git, Terraform, Nginx, Helm, Exim4, Google Kubernetes Engine (GKE)Paradigms
DevOps, Continuous Integration (CI), Continuous Delivery (CD), Concurrent Programming, SambaPlatforms
Debian Linux, Ubuntu Linux, Kubernetes, Google Cloud Platform (GCP), Linux, Docker, Debian, UbuntuStorage
MySQL, MySQL Clustering, PostgreSQLOther
Site Reliability Engineering (SRE), Infrastructure as Code (IaC), Cloud, Cloud Architecture, Mathematics, Computer Science, Distributed Systems, Vitess, RAID, dpkg, Google Container Engine, Software Development, Cloud Infrastructure, OAuth, Borg, Dovecot, NFS, BlazeLibraries/APIs
OpenID, Standard Template Library (STL)Frameworks
Flask
Education
- Bachelor of Science Degree in Computer Science2004 - 2009Eötvös Loránd University - Budapest, Hungary
- Professional Degree in Software Engineering1999 - 2004John von Neumann Technology College - Hungary
Certifications
- Certified Cloud ArchitectDECEMBER 2018 - DECEMBER 2020Google
