You Should Use Hashtags
I put hashtags in my posts. You should, too. Not to boost social media engagement (gross), but rather to empower readers to curate their timelines.
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Justin Mayer // Investor • Founder • Developer • Speaker
🎨 Aa
Justin Mayer
Investor • Founder • Developer • Speaker
Justin Mayer is an investor, SaaS founder, software developer, and open-source maintainer.
Latest posts 🔎 Search:
“Any Updates?”
Open-source projects are developed in plain sight — the current status is almost always fully visible to everyone. Which is why posting comments like “Any updates?” is just about the least helpful comment anyone can make.
in opensource · Tue 07 February 2023
Fortressa — The App Store for Open Source
Fortressa is the app store for open source, providing you with open-source SaaS alternatives to take back control over your data and reduce your software costs.
in opensource · privacy · Tue 25 October 2022
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
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
Articles from sites I follow
Apple Messages app violates tracking number privacy
Today I received a shipment notification via text message to my phone number from a company unrelated to Apple. The …
via The Desolation of Blog 11 November 2025A Jekyll plugin for viewing large SVG diagrams
I recently built a WordPress plugin specifically for my friend Allison Sheridan over at Podfeet Podcasts. She had a huge …
via BrettTerpstra.com - The Mad Science of Brett Terpstra 10 November 2025Design Pressure
Ever had this weird gut feeling that something is off in your code, but couldn’t put the finger on …
via Hynek Schlawack 22 May 2025