Dimitris Mitsos

CosmoHacker

Building things that make the world a bit better

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I've had code in me since I was 5. Did all sorts of things along the way — private game servers with thousands of players, crawlers that hit Alexa rank 1,800, AI-powered tools, and high-performance data structures that beat the state of the art.


I'm from Greece. I call myself a CosmoHacker — not because it sounds cool, but because it reminds me what the point is. Make things a bit better for the people around you. That's the whole philosophy.

what i've built
roam-code
18 commands, <1s queries
Instant codebase comprehension for AI agents. Index once, query everything — symbols, architecture, dependencies, git signals. Replaces explore mode.
github.com/Cranot/roam-code
claude-code-guide
2,300+ stars
The complete Claude Code CLI guide. Live and auto-updated every 2 days. The most popular resource for Claude Code users.
github.com/Cranot/claude-code-guide
grouped-simd-hashtable
46 stars
High-performance C++ hash table using grouped SIMD metadata scanning. Beats state-of-the-art at scale.
github.com/Cranot/grouped-simd-hashtable
tieredsort
3.6x faster than std::sort
Header-only C++17 sorting library. Up to 21x faster on dense data. Outperforms every major implementation.
github.com/Cranot/tieredsort
mzip
32,768x compression
Store the formula, not the data. Detection-based compression: 32KB for 1MB of sequential IDs. Beats zstd, brotli, bzip2.
github.com/Cranot/mzip
deep-research
163 stars
Turn any question into multi-agent exploration. Recursive Claude agents that spawn sub-agents for deep research.
github.com/Cranot/deep-research
chameleon-cache
Variance-aware cache replacement policy that beats TinyLFU by +5.09pp through the Basin of Leniency.
github.com/Cranot/chameleon-cache
AgentsKB.com
39K+ Q&As
The knowledge layer for AI agents. Replaces web search with 40ms deterministic answers from official docs. Same question, same answer, every time.
agentskb.com
SimpleConverters.com
100 tools, 1 day
100 mini utility tools. No bloat, no tracking, no ads. Just useful stuff.
simpleconverters.com
what i believe
CosmoHacker
/ˈkɒzmoʊ.hækər/ — noun

Someone whose actions are meant to make someone else's life a bit better.

01

Your body runs the show

You can have all the right ideas, read all the right books, believe all the right things — and still be a mess. Because your body is tired, your sleep is trash, and your nutrition is an afterthought.

I've lived this. On good days — when the body's working — I see things clearly. I'm patient. I'm kind. On bad days, same brain, same beliefs, but everything's harder.

We don't need a new philosophy. We need better fuel. Fix the body, and the mind follows.
02

You can't care on empty

Want to help people? Want to build things that matter? You need two things first: energy and good vibes. Without those two, even the best intentions go nowhere.

Most people are running low on both. Not because they're lazy. Because modern life drains you faster than you can refill.

You can't hack the cosmos running on empty. The machine needs fuel.
03

Be realistic about people

I used to think if you just explained things well enough, people would get it. They don't. Not because they're stupid — because that's not how humans work. People need to arrive at things on their own.

// being honest

You can't save everyone. You can't even reach most people. And that's okay.

The world is changing fast — AI, technology, everything. The old playbooks don't work anymore.

Focus on what you can actually affect. Build things. Help the people in front of you.

That's the real CosmoHacker move. Not grand plans to change the world. Just making things a bit better, wherever you can, with whatever you've got.

I share what I'm building and thinking in real time.

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