Mads Hartmann

I’m an experienced software engineer and tech lead with a focus on reliability. I love diving head first into production issues, especially the weird ones. When I’m not rummaging around in production I spend my energy making it easier to understand, and eventually more reliable.

Publications

Increment Issue 16: Reliability — Tracing a path to observability

Technical reviewer

Observability Engineering

Experience

OpenAI Aug 2026 – Present

Current

  • Member of Technical Staff Aug 2026 – Present
    Full-time · London Area, United Kingdom · Remote
Ona (formerly Gitpod) Apr 2021 – Aug 2026

5 years 5 months

  • Staff Engineer Dec 2022 – Aug 2026 (3 years 9 months)
    Full-time · Remote
  • Site Reliability Engineer Apr 2021 – May 2023 (2 years 2 months)
    Remote
Glitch Dec 2018 – April 2021

2 years 5 months

As a Site Reliability Engineer I worked across the company to improve the reliability of the platform. I led projects to improve our observability, reduce the blast radius of code and configuration changes, improve our alerting through SLO-based alerts, and helped improve our incident response process. Our services were written in Node.js, hosted on AWS, and provisioned using Terraform.

  • Engineering Manager Nov 2020 – April 2021 (6 months)
    Remote
  • Staff Site Reliability Engineer Aug 2020 – Nov 2020 (4 months)
    Remote
  • Site Reliability Engineer Dec 2018 – Aug 2020 (1 yr 9 months)
    Remote
Famly Sep 2016 – Nov 2018

2 years 3 months

I spearheaded our efforts to automate and streamline our infrastructure. Specifically dockerizing our applications, setting up a proper CI pipeline, as well as setting up our Kubernetes cluster. I worked mostly in Scala with a focus on utilizing functional programming techniques.

  • Fullstack Engineer Sep 2016 - Nov 2018 (2 years 3 months)
    Copenhagen
Issuu Oct 2013 – Aug 2016

2 years 11 months

I worked as a fullstack engineer developing features end-to-end, which included making sure everything was performing well and ran reliably in production. I worked in OCaml, Erlang, Python, and Javascript.

  • Fullstack Engineer Oct 2013 - Aug 2016 (2 years 11 months)
    Copenhagen

Education

Masters degree in Computer Science 2013

University of Copenhagen

Specialised in programming languages and type systems.

Bachelors degree in Computer Science 2011

IT University of Copenhagen

Elsewhere