Resources for Developers
A curated toolbox of books, frameworks, and hands-on guides from the people at HappiHacking.
Featured
The BEAM Book
The definitive guide to the Erlang runtime system
"A must-read for any #erlang or #elixirlang developer."
— @lucianparvu
Sponsored by Jose Valim (Elixir creator)
#1 Bestseller and #1 New Release on Amazon. Featured #1 on Hacker News.
Deep Dive: The BEAM for Developers
A hands-on course for mastering the BEAM, tracing, debugging, and scaling real systems
"I found the philosophical part useful for the team to design our applications."
— Shraman, Delta Exchange
Hands-on
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Certification
PhD Thesis "Programming Erlang Style"
Academic deep dive into the BEAM virtual machine, Erlang runtime system (ERTS), and robust distributed systems
"The days are all empty and the nights are Unreal."
— cookie
Academic
Research
Mastering Developer Productivity
Empowers developers to find motivation, optimize workflows, and achieve balance for professional growth
A practical, actionable course for devs and leads: Build habits, optimize workflows, and get more done—without burning out. Based on proven productivity science and developer reality.
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6 Modules
Strategic Foundations for Entrepreneurial Success
Comprehensive coaching program for building profitable, sustainable businesses from strategy to execution
"Finally got my business finances under control and found my true profit drivers."
— Course Graduate
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Coaching
Profit First
Kappa
A tool for keeping large Erlang codebases-developed by multiple teams-in a manageable state
Kappa was conceptualized and started by Erik Stenman at Klarna to keep massive, multi-team Erlang codebases manageable and transparent. Now open source—ideal for analytics and codebase health at scale.
Open-source
Klarna
The HappiHacking Blog
In-depth guides, real-world post-mortems, productivity tactics, and BEAM insights from the field
"Thank you for writing this book! I really wanted this a few years ago as I was debugging production Elixir, when existing learning sources were pretty dense and dry (or too simple and shallow)."
— bicx, Hacker News
Weekly
Practical
Erlang and OTP in Action
A practical, experience-rich guide to Erlang and OTP by Richard Carlsson and co-authors.
"An enormous amount of experience, combined."
— Ulf Wiger
Classic
Erlang/OTP Contributions
Contributed to Erlang/OTP during both the HiPE research era and ten years scaling Klarna.
Contributed to Erlang/OTP during the HiPE research era and throughout a decade scaling Klarna—patches, ideas, and insights that helped shape the runtime still used in production today.
Erlang
Coming Soon
Fintech Compliance Book
BookA practical guide to building scalable, compliant fintech platforms-bridging regulatory theory with hands-on architecture.
A hands-on guide to building scalable, compliant fintech systems. Written from the trenches: how to balance speed, security, and regulation in real product teams.
Coming 2025
Fintech
BEAM Tracing Cheatsheet
GuideFast, practical cheatsheet for tracing and debugging BEAM systems in production—covering redbug, modern :erlang tracing, and more.
Fast, production-safe tracing recipes for Erlang/Elixir: redbug, modern :erlang.trace, and more. Everything in this cheatsheet is field-tested on real incidents.
In Progress
Free
Wireframe
FrameworkA BEAM-native backend framework for rapid, compliant development
A BEAM-native backend framework for regulated industries—rapid development, built-in compliance, and developer ergonomics from the ground up. Coming soon.
Coming Soon
Framework
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