Justin Spahr-Summers

Software engineering, technical leadership, management. Previously employed at Facebook and GitHub.

View My GitHub Profile


I’m a seasoned software engineer and engineering manager with highly varied technical experience, including:

As an engineering manager and a technical lead, I emphasize coaching and mentoring, and sharing mental models to help everyone level up. I also care strongly about how companies and teams organize themselves and their work, and am deeply familiar with the common growing pains.

I’ve done a little bit of everything, and if there’s something I haven’t done before, I’ll learn it.

I’m available for remote contract work in various formats. Please email justin@jspahrsummers.com and we can discuss more.


You can find me as @jspahrsummers on GitHub, Twitter, LinkedIn, Medium.

I’ve also written some things on Quora occasionally, and given some talks.


Open source projects

Here are some of the open source projects that I have started or contributed to:

Metacognitive Consulting Ltd is a limited company registered in England and Wales.
Registered number: 13130200.
Registered office: First Floor, Telecom House, 125-135 Preston Road, Brighton, East Sussex, BN1 6AF.