Fredrik Ljungdahl

Stockholm County, Sweden

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Summary

🤩

Rockstar

🎓

Top School

Fredrik Ljungdahl is a self-taught software engineer with over a decade of hands-on experience in game and web development, tracing his roots to a chatbot he built at 13. He has professional web development experience (PHP/MySQL) from FL-Net AB and ongoing studies in computer games and engineering, combining formal learning with deep practical tinkering. Fredrik is an active open-source contributor, improving C++ game codebases like VVVVVV and contributing substantial backend fixes to high-profile Pokémon disassemblies and fan projects that require assembly-level understanding. His work spans from level editor UX and rendering fixes to battle-engine logic and WRAM-level bug hunts, reflecting strong low-level debugging skills and systems thinking. Earlier interest in security research honed his QA instincts and attention to edge-case vulnerabilities, though he no longer pursues active disclosure hunting. Based in Stockholm, he brings a rare mix of game design intuition, retro/assembly expertise, and reliable backend engineering.

12 years of coding experience

Kandidatexamen (pågående), Computer Games and Programming Skills, Kandidatexamen (pågående), Computer Games and Programming Skills at Stockholms universitet

KTH Royal Institute of Technology

Gymnasieexamen, Natural Sciences, Gymnasieexamen, Natural Sciences at Tyresö Gymnasium

Swedish, English, svenska teckenspråket

Github Skills (22)

editors10

debug10

assembly10

c-language10

z8010

leveldb10

c1110

pokemongo10

editor10

c1710

mechanics10

assemble10

assembler10

disassembly10

game-development10

Programming languages (10)

C#TypeScriptJavaC++CJavaScriptHTMLAssembly

Github contributions (5)

Rangi42/polishedcrystal

Feb 2020 - Jan 2023

An upgrade to Pokémon Crystal. Brings features and content up to date, and adds some original content.

Role in this project:

Back-end Developer

Contributions:14 reviews, 924 commits, 83 PRs in 2 years 11 months

Contributions summary:Fredrik primarily contributed to the back-end development of a Pokémon Crystal upgrade, focusing on battle engine logic and core gameplay features. Their work included implementing and fixing move usability checks, addressing issues with status effects and moves like Encore and Destiny Bond, and resolving bugs related to item use. The user's contributions indicate a deep understanding of the game's mechanics and the ability to debug and improve its core systems.

mongamegameboy-colorgbz80crystal

pret/pokecrystal

Oct 2016 - Aug 2022

Disassembly of Pokémon Crystal

Role in this project:

Back-end Developer

Contributions:11 commits, 6 PRs, 4 comments in 5 years 10 months

Contributions summary:Fredrik primarily contributed to fixing and improving the Pokémon Crystal disassembly project. Their work involved correcting comments, labels, and identifying and addressing bugs within the game's code. Specific areas of focus included battle mechanics, AI behavior, item handling, and WRAM (Working RAM) labeling, demonstrating a strong understanding of the game's internal workings and assembly language. The user's changes improve accuracy and address logic flaws within the project.

capstonemongameboy-colorgbz80crystal

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