Rust

👋 Staff Engineer — Systems, AI & Blockchain · Fractional CTO · 15+ years building systems that move money, ship products, and scale. 📍 Based in Las Palmas, Spain · EU citizen (Spanish nationality) · remote-first, open to EU/Americas. 🛠 Player-coach: I lead engineering teams (up to 8) and stay deep in production code. 🎖 8-year Microsoft MVP (Developer Technologies).

I work across three areas at staff level — not one.

• 6 years in MEV. Ethereum and Solana searcher pipelines in Rust (tokio, async) and Python/Cython.
• On-chain pipelines processing 50ドルM+ daily flow, 10K+ opportunities/day, 100ドルK+ attributable annual P&L, sub-10ms p99 execution.
• Led migration from Python/Cython to Rust → 20x throughput.
• Custom transaction delivery with parallel RPC broadcasting + direct validator/TPU routes → sub-slot (~400ms) inclusion on Solana, +35% inclusion under heavy competition.
• Flashbots stack (MEV-Boost, Suave, MEV-Share, PBS, relays) on Ethereum; Jito ecosystem (bundles, BAM, BuilderNet, Agave) on Solana.
• Reverse-engineered Geth / Reth internals; contributor to REVM.
• Sandwich, multi-hop arbitrage across 5+ DEXs, liquidations, sniping on Pump.fun / Raydium / Jupiter / Orca.

• Co-Founder & Lead AI Architect of KliverAI — an AI platform turning expert knowledge into scalable training simulations (500+ users, closed Feb 2026).
• Multi-agent architectures on LangGraph (state machines, conditional routing, ReAct). Dynamic model routing across OpenAI, Anthropic, Gemini + AWS Bedrock / Azure OpenAI / Vertex AI.
• Real-time audio pipelines (OpenAI Realtime API + Azure SignalR) — sub-200ms TTFT, scaled concurrent users 500%, latency down to 90ms.
• Production RAG across Pinecone, Chroma, pgvector, Redis (hybrid retrieval, cross-encoder reranking). MCP servers & clients.
• LLM eval & observability: LangSmith, RAGAS, DeepEval, Langfuse, OpenTelemetry GenAI. Inference cost optimization.

• Zero-Knowledge systems with Noir, Barretenberg, Garaga on StarkNet — privacy-preserving, verifiable expert judgment at scale.
• Polkadot Blockchain Academy graduate — Lisbon, 2026.
• Polkadot SDK, Substrate, FRAME, XCM, parachains. Ink contracts.
• Account abstraction (ERC-4337), Cairo. Plutus / Haskell on Cardano.

Selected impact: +40% client revenue (image-embeddings product matching) · −70% production bugs · −45% combined API + cloud spend · led full-stack JS→.NET migration · grew a blockchain team from 4 → 10 engineers.

• Engineering teams up to 8. Hiring, performance reviews, on-call, incident response.
• 🎖 8-year Microsoft MVP (Developer Technologies).
• Founder of Net-Baires — largest .NET community in Argentina (100K+ members, 10+ years).
• Founder of Crypto Para Mortales (blockchain conference) & Patrones Para Mortales (design-patterns content).
• 🎤 80+ international talks — .NET Conf, DevFest, NetCoreConf, vOpen, Global Azure Bootcamp across LATAM & Europe.

• Languages: Rust (tokio, async) · Go · C# / .NET (8/9, ASP.NET Core, EF Core) · TypeScript · Python (FastAPI) · Cython · C++ · Solidity · Cairo · Haskell
• AI / LLM: LangChain / LangGraph · RAG · MCP · multi-agent · Pinecone / Chroma / pgvector · LangSmith / RAGAS / Langfuse · OpenAI Realtime · Deepgram / ElevenLabs / Whisper
• Blockchain: Foundry · Hardhat · Geth · Reth · REVM · Noir · Barretenberg · Garaga · Substrate · Anchor
• Infra: AWS · Azure · GCP · Kubernetes · Docker · Terraform · Prometheus · OpenTelemetry · Grafana
• Architecture: DDD · CQRS · Event Sourcing · Saga · Clean / Hexagonal · microservices

• 🏆 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

Stage magic (member of Círculo Mágico de España), stand-up comedy, 10+ years of theater & improv, and mentalism — all of it sharpens high-stakes communication, team facilitation, and public speaking. 🌐 Languages: Spanish (native) · English (full professional).

• 🌐 Web · germankuber.com
• 💼 LinkedIn · linkedin.com/in/germankuber
• 🐦 Twitter · @germankuber
• 📺 YouTube · youtube.com/@germankuber
• 🧩 LeetCode · leetcode.com/u/germankuber