Creating self-contained development environments for different projects, loading all the neccessary settings, dependencies and tools automatically, when visiting project in the shell or IDE. Will also talk about twelve-factor app, direnv, envrc.el, GNU Guix and related topics.

0:00 Introduction
0:55 The Twelve-Factor App
2:25 Environment Parts
4:10 Dependencies and Tools
5:40 Configs (Environment Variables)
8:10 Backing Services
9:30 Environment Gap
13:15 direnv
16:00 Providing Credentials via Env Vars
18:50 Installing Tools and Dependencies with GNU Guix
28:10 Making the Environment Reproducible
33:25 Integrate direnv with Emacs
36:00 Fixing Minor Integration Issues
40:30 Using Additional Guix Channels
43:30 The Problems
45:00 Summary

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Notes:
https://github.com/abcdw/notes/blob/master/notes/20210823124653-per_project_dev_environment.org