Justin Mayer is an investor, SaaS founder, software developer, and open-source maintainer.

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Introduction to Long-Term Investing

How to invest for long-term wealth building, financial freedom, and security in retirement.

in investing · Tue 05 October 2021

Homebrew Python Is Not For You

Don’t use Homebrew Python. It’s not meant for you.

in python · Wed 03 February 2021

The High Cost of the Early Adopter Tax

Being an early adopter of technology has significant costs that may not be worth paying.

in lifehack · Tue 30 April 2019

Fortressa - Create Your Own Private VPN

Net neutrality is under threat, and your Internet activity is being recorded and sold to the highest bidder. I built Fortressa to combat this theft and protect your privacy.

in privacy · security · Wed 31 January 2018

U2F Hardware Security Keys

Universal 2nd Factor (U2F) hardware security keys and multi-factor authentication (MFA) combine to provide strong security and good usability — the best of both worlds.

in security · Thu 14 December 2017

Multi-Factor Authentication, Phones, and SMS

Most implementations of multi-factor authentication (MFA), also known as two-factor authentication (2FA), rely on sending codes via SMS text messages or phone calls. There are serious problems with this approach.

in security · Mon 13 November 2017

Don’t Make Your Own Two-Factor Authentication App

Multi-factor authentication can be poorly implemented in a multitude of ways, and one of those ways is to ship a custom branded authentication app.

in security · Thu 02 November 2017

Multi-Factor Authentication Best Practices

Two-factor authentication (2FA), also known as multi-factor authentication (MFA), comes in many flavors. But not all are created equal. Best practices should involve at least two selections from this list: FIDO U2F hardware keys, one-time passwords (OTP), and recovery codes.

in security · Wed 01 November 2017

Tacklebox for Fish Shell

Tacklebox is a framework for organizing and sharing Fish shell functions, plugins, modules, and themes.

in geekery · Tue 17 October 2017

Justin Mayer