👋 Fractional CTO & Staff Engineer · 15+ years building systems. 📍 Based in Las Palmas, Spain (EU citizen). 🛠 Player-coach: I lead engineering teams and stay deep in the code.
I work across three areas at staff level — not one.
- 6 years in MEV. Ethereum and Solana bots in Rust.
- On-chain pipelines processing $50M+ daily, 10K+ opportunities/day, $100K+ annual P&L, sub-10ms execution.
- Led migration from Python/Cython to Rust → 20x throughput.
- Direct TPU connections on Solana, sub-slot (~400ms) inclusion.
- Internals of Geth / Reth, contributions to REVM.
- Sandwich, multi-hop arbitrage across 5+ DEXs, liquidations, sniping on Pump.fun / Raydium / Jupiter / Orca.
- Founder of KliverAI (closed).
- Multi-agent architectures with LangGraph. Dynamic routing across OpenAI, Anthropic, Gemini.
- Real-time audio pipelines with OpenAI Realtime API + SignalR — sub-200ms.
- RAG, MCP, prompt engineering, inference cost optimization.
- Zero-Knowledge systems with Noir, Barretenberg, Garaga on StarkNet.
- Polkadot Blockchain Academy graduate — Lisbon, 2026.
- Polkadot SDK, Substrate, FRAME, XCM, parachains. Ink contracts.
- Plutus / Haskell on Cardano.
- Engineering teams up to 8. Hiring, performance reviews, on-call, incident response.
- Fractional CTO at Rocking Product.
- 🎖 8-year Microsoft MVP (Developer Technologies).
- Founder of Net-Baires — largest .NET community in Argentina (100K+ members).
- 🎤 80+ international talks.
- Languages: Rust · Python · Cython · C# / .NET · TypeScript · Solidity · Cairo · Haskell
- Runtime & libs: Tokio · LangChain / LangGraph · React · Angular
- Infra: AWS · Azure · Kubernetes · Docker · Prometheus · OpenTelemetry
- Chains: Foundry · Hardhat · Geth · Reth · REVM · Noir · Barretenberg · Substrate
- 🏆 mev_challenge — Rust MEV simulation & research framework
- ⚡ eth-sim — Fast Ethereum simulator in Rust
- 🔬 polkadot-under-the-hood — Deep dives into Polkadot/Substrate internals
- 🌳 binary-patricia-merkle-trie — Binary Patricia Merkle Trie in Rust (JAM/Polkadot style)
- 🐾 nanoclaw — Containerized multi-channel agent on Anthropic Agents SDK
- 🎙 voice-ai-assistant — Real-time voice assistant on OpenAI Realtime API
- 🌐 Web · germankuber.com
- 💼 LinkedIn · linkedin.com/in/germankuber
- 🐦 Twitter · @germankuber
- 📺 YouTube · youtube.com/@germankuber
- 🧩 LeetCode · leetcode.com/u/germankuber