Germán Küber
Staff Engineer — Systems, AI & Blockchain | Microsoft MVP
Microsoft MVP for 8 consecutive years. Founder of Net-Baires, Argentina's largest dev community (100K+ members). 15+ years building systems that move money, ship products, and scale—from low-latency MEV trading in Rust ($50M+ daily on-chain flow, $100K+ annual P&L, sub-10ms execution) to real-time AI platforms (multi-provider LLM orchestration, sub-200ms voice TTFT, RAG, MCP) to enterprise architectures. Player-coach who builds teams (up to 8 engineers), drives architectural decisions, and stays deep in production code across Rust, Python, .NET, and Node.js. 80+ international talks at .NET Conf, DevFest, NetCoreConf, vOpen and more across LATAM & Europe. EU citizen (Spanish nationality), remote-first, open to EU/Americas.
German.kuber@gmail.com
+34 666 844731
Las Palmas, Spain
germankuber@germankubergermankuber.comGermanKuber@germankuberKey Achievements
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Microsoft MVP — 8 consecutive years
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Net-Baires Founder — 100K+ developer community
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Technical Talks — 80+ .NET Conf, DevFest, vOpen
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MEV Profit — $100K+ Rust pipelines at Borderless
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Kliver Co-Founder — 500+ AI training platform users
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Daily Volume — $50M+ On-chain monitoring systems
Work Experience
Co-Founder & Lead AI Architect
KliverAI (Own Venture, closed Feb 2026)
03/2025 - 02/2026
Remote, Spain
- •Founded and built KliverAI — an AI platform that converts expert knowledge into scalable training simulations. Owned technical strategy and end-to-end delivery as senior-most engineer on a polyglot stack (Node.js/TypeScript, Python, .NET, Rust, Kubernetes, AWS) supporting 500+ users in dynamic roleplay scenarios.
- •Rewrote the real-time layer from app-embedded SignalR to Azure SignalR Service with Redis-backed state, scaling concurrent users by 500% while holding sub-200ms latency on audio pipelines (OpenAI Realtime API).
- •Benchmarked TTS/STT services (ElevenLabs, Deepgram, AssemblyAI, OpenAI Whisper, Play.ht) on latency, cost, and quality — getting latency to 90ms and word accuracy to nearly 95%.
- •Integrated three LLM providers (OpenAI, Anthropic Claude, Google Gemini) with dynamic model routing across direct APIs and managed cloud services (AWS Bedrock, Azure OpenAI, Vertex AI), picking the best model per task to cut inference spend.
- •Built an adaptive simulation engine with multi-agent architecture on LangGraph — state machines, conditional routing, ReAct-style reasoning, multi-step branching, and RAG-powered personalization with 90%+ context relevance.
- •Shipped production RAG pipelines across Pinecone, Chroma, pgvector, and Redis with semantic search, hybrid retrieval, and cross-encoder reranking; implemented MCP (Model Context Protocol) servers and clients to standardize tool access.
- •Designed a decentralized marketplace for human evaluation criteria using Zero-Knowledge proofs (Noir, Barretenberg, Garaga on StarkNet) — privacy-preserving, verifiable expert judgment at scale.
- •Instrumented LLM evaluation and observability with LangSmith, RAGAS, DeepEval, Langfuse, and OpenTelemetry GenAI conventions; ran red-teaming and structured evals to reduce hallucination on critical paths.
- •Built a Chrome Extension for real-time Google Meet capture, streaming transcripts via WebSocket into an automated AI evaluation pipeline.
- •Hired and led a distributed team of up to 3 engineers; ran technical interviews, hiring decisions, and architectural reviews while remaining hands-on in code.
Fractional CTO (parallel to KliverAI)
Rocking Product
04/2025 - 12/2025
Remote
- •Came in as Fractional CTO to an 8-engineer team and restructured it in the first quarter without stepping away from the code — stabilizing release cadence and reducing sprint carryover; ran technical interviews and final hiring decisions.
- •Built an image embeddings service (Azure AI Vision + CLIP) to improve product matching across brand comparisons, raising accuracy and lifting the client's revenue by 40%.
- •Cut production bugs by 70% through team training and automated processes (testing, CI/CD, code review).
- •Optimized LLM usage and cloud infrastructure through model selection, prompt compression, and semantic caching — cutting combined API and cloud spend by 45%.
- •Designed a reusable base architecture on LangChain and LangGraph with Langfuse/LangSmith monitoring and prompt versioning; migrated the real-time LLM service from OpenAI to Azure AI Foundry for compliance and data retention, cutting latency and improving scalability.
- •Introduced Spec-Driven Development (SDD) and AI-driven development workflows with autonomous agents automating code review, testing, deploys, and monitoring.
- •Proposed and led a full-stack migration from a fragmented JavaScript codebase to .NET (ASP.NET Core, Entity Framework Core, Clean Architecture), modernizing the platform for long-term scalability.
- •Shipped AI-powered features in Node.js/TypeScript and Python (FastAPI, LangChain); established the team's first LLM evaluation and monitoring practices including faithfulness and correctness scoring.
- •Ran weekly public-speaking workshops to sharpen team communication, raising the quality of client meetings.
Lead Software Engineer (Blockchain / MEV)
Borderless Capital / CTF Capital
09/2021 - 03/2025
Remote
- •Designed and operated production MEV searcher pipelines in Rust (tokio, async) and Python/Cython across EVM (Ethereum, Arbitrum, Optimism) and Solana — processing 10K+ opportunities/day from $50M+ in daily on-chain flow with $100K+ attributable annual P&L and execution under 10ms p99.
- •Migrated the system from Python/Cython to Rust and took it to 20x more transactions per second — tuning tokio runtime parameters, async boundaries, and lock-free coordination patterns for sub-10ms targets.
- •Built custom transaction delivery infrastructure with parallel broadcasting across RPC endpoints and direct validator/TPU routes, achieving sub-slot inclusion on Solana (~400ms) and improving inclusion probability by 35% under heavy mempool competition.
- •Integrated the Flashbots stack (MEV-Boost, Suave, MEV-Share, PBS, relays) for Ethereum MEV execution and bundle submission, and the Jito ecosystem on Solana (bundles, BAM/Block Assembly Marketplace, BuilderNet, Agave, Jito-Solana fork) for validator routing.
- •Built Node.js/TypeScript services that interact with DeFi protocols on-chain — AMMs (Uniswap V2/V3, Curve, Raydium, PumpSwap) and lending markets (Aave) — using ethers.js, viem, web3.js, and @solana/web3.js.
- •Designed strategy logic including liquidation detection, multi-hop arbitrage across 5+ DEXs, and cross-chain flow modeling.
- •Reverse-engineered Geth and Reth to improve transaction simulation and gas estimation; contributed to the REVM community.
- •Ran technical due diligence on 5+ projects that ended up getting funded — architecture, risk, and feasibility — acting as the CTO's technical reference on the low-level side.
- •Implemented low-latency observability with Prometheus and custom Rust telemetry, tracking 50+ real-time metrics for slot timing, validator rotation, and execution outcomes.
- •Conducted research and PoC on Zero-Knowledge technologies and L2 ecosystems (StarkNet, Cairo, account abstraction/ERC-4337), evaluating applicability for next-generation MEV tooling.
- •Owned 24/7 production reliability and incident response (on-call rotation, post-mortems); helped build the blockchain team, which grew from 4 to 10 engineers.
Senior Software Architect
Paramo Technology
10/2020 - 09/2021
Remote
- •Owned the end-to-end architecture of a high-traffic online casino (iGaming) platform handling real-time money operations and regulatory reporting, working directly with the CTO.
- •Spotted the issues slowing teams down and designed action plans that raised productivity by 40%, measured by features shipped and fewer errors.
- •Designed and rolled out event-driven microservices in .NET (C#, ASP.NET Core) handling real-time game state, wallet operations, and regulatory reporting with strict consistency requirements; migrated relational databases to MongoDB where it made sense.
- •Implemented distributed tracing across all services (OpenTelemetry, Application Insights, Datadog) to catch bugs early and resolve production issues faster.
- •Brought in Kubernetes to scale; built automated deploy pipelines; helped migrate services to newer .NET versions.
- •Applied Domain-Driven Design (aggregates, value objects, domain events), design patterns, and CQRS for read/write separation across complex gambling and wallet domains.
- •Led part of the hiring and designed the technical entry exam; created and delivered internal training programs on architecture patterns, testing discipline, and operational best practices.
Software Architect (Full-Stack) — First Employee
CloudX (Software Consultancy)
09/2017 - 10/2020
Remote / Buenos Aires
- •Was the company's first employee; led architecture decisions across several enterprise product lines, often working on-site with clients, and helped build the team as it grew.
- •Built microservices backends in Node.js/TypeScript and .NET (C#, ASP.NET) across multiple enterprise product lines using Domain-Driven Design and Clean Architecture / Hexagonal patterns.
- •Designed Angular and React frontends with reusable component libraries and TypeScript shared across enterprise products.
- •Built a distributed system over geospatial data with PostGIS for a UK client.
- •Delivered technical training and conference talks to partners and internal engineering teams; collaborated directly with clients on requirements gathering and technical adoption.
Software Architect (Angular / .NET)
Majestic Hotel Group
01/2014 - 08/2017
- •Designed and built full-stack features in Angular and .NET for internal hotel management platforms, first as Team Lead and later as architect.
- •Led the migration from AngularJS to Angular 2, improving maintainability, performance, and code consistency across the platform.
- •Redesigned the data model toward an event-oriented architecture, reducing coupling across integrations and simplifying long-term maintenance.
- •Defined and documented backend and frontend development processes to streamline deployments and team collaboration.
.NET Web Developer
Plus54
2011 - 2014
Buenos Aires
- •Built .NET web applications and internal tools, delivering features across backend and frontend.
- •Designed and built early mobile application components, collaborating with senior developers on architecture and UX.
- •Integrated external services and APIs, implementing unit tests and ensuring reliable data exchange between systems.
Software Developer
Acsys
2009 - 2011
Buenos Aires
- •Developed and maintained .NET web applications and internal client solutions end-to-end across backend and frontend.
- •Participated in requirements gathering and delivery for multiple business-line projects.
Junior Developer
IBM
2008 - 2009
Buenos Aires
- •Started professional career at IBM contributing to enterprise .NET projects.
- •Worked alongside senior engineers on backend features, integration work, and quality processes.
Skills
Languages:Rust (tokio, async), Go, C# / .NET (8/9), TypeScript, JavaScript, Python (FastAPI), Cython, C++, Solidity, Cairo
AI / LLM Systems:Multi-provider LLM orchestration, OpenAI, Anthropic Claude, Google Gemini, AWS Bedrock, Azure OpenAI, Vertex AI, LangChain, LangGraph, RAG, MCP (Model Context Protocol), Multi-agent, Function calling, Structured outputs
Real-Time AI & Voice:OpenAI Realtime API, Deepgram, ElevenLabs, AssemblyAI, Whisper, SignalR, Azure SignalR Service, WebSocket streaming, Sub-200ms TTFT
Vector DBs & RAG:Pinecone, Chroma, pgvector, Redis (RediSearch), Hybrid retrieval, Cross-encoder reranking
LLM Eval & Observability:LangSmith, RAGAS, DeepEval, Langfuse, OpenTelemetry GenAI, Red-teaming
Blockchain & Web3:EVM (Ethereum, Arbitrum, Optimism, Base), Solana, StarkNet, Polkadot / Substrate, MEV Infrastructure, Flashbots stack (MEV-Boost, Suave, MEV-Share, PBS), Jito (bundles, BAM, BuilderNet), Zero-Knowledge (Noir, Barretenberg, Garaga, Cairo), Account abstraction (ERC-4337)
Web3 Tooling & Clients:ethers.js, viem, web3.js, @solana/web3.js, Foundry / Forge, Anchor, Hardhat, Geth (reverse-engineered), Reth, REVM (contributor)
Distributed Systems:tokio / async, Low-latency networking (sub-10ms p99), P2P, Consensus (GRANDPA / BABE), Event-driven microservices, Fault tolerance, gRPC, Protocol Buffers
Cloud & Infrastructure:AWS (Lambda, Bedrock, ECS, S3, SNS/SQS, EventBridge), Azure (AKS, Service Bus, Cosmos DB, OpenAI, AI Foundry, SignalR Service), GCP (Vertex AI), Docker, Kubernetes, Terraform, Bicep, CI/CD
Databases & Storage:PostgreSQL (pgvector), MySQL / Aurora, SQL Server / Azure SQL, MongoDB, Cosmos DB, Redis, DynamoDB, ClickHouse
Observability:Prometheus, OpenTelemetry, Application Insights, Datadog, Grafana, Custom Rust telemetry (50+ metrics), Distributed tracing
Security & Identity:OAuth 2.0 / OIDC, Entra ID (Azure AD), IdentityServer / Duende, JWT, mTLS, OWASP Top 10, Zero Trust
Frontend:React 18, Next.js 14+ (App Router, RSC), React Native (Expo, EAS), Angular, TypeScript, Tailwind, Zustand, Tanstack Query
Architecture & Patterns:Microservices, Domain-Driven Design, CQRS / Event Sourcing / Saga, Clean Architecture / Hexagonal, Vertical Slice, Polyglot persistence
Engineering Practices & Leadership:TDD, Pair programming, Code review, ADRs, Design reviews, Technical interviewing & hiring, Mentoring, On-call & incident response, Spec-Driven Development (SDD)
Soft Skills
Avid learnerCollaborative TeamworkRapid Learning & ResearchAdaptabilityClear Technical CommunicationEnd-to-end big pictureMentorship and CoachingDeep Focus / High-Concentration WorkResults-focusedAnalytical Problem-Solving
Education
Polkadot Builder Program
Polkadot Blockchain Academy
04/2026
Lisbon, Portugal
Systems Engineer
UAI - Universidad Abierta Interamericana
01/2017 - 12/2021
Buenos Aires, Argentina
Honor Awards
Microsoft MVP Developer Technologies
02/2017 - Present
Microsoft
Microsoft Student Partners
01/2016 - Present
Microsoft
Recognition for effort in university and the community.
Volunteer Experience
Programá tu futuro
Buenos Aires Government - Volunteer Program
02/2015 - 10/2015
Buenos Aires
- •Volunteered as programming instructor for underprivileged youth, teaching fundamentals of software development and computational thinking.
- •Designed hands-on coding workshops introducing kids to programming concepts, helping them build their first applications.
Public Speaking & Open Source
- •80+ international technical talks at .NET Conf, DevFest, NetCoreConf, vOpen, Global Azure Bootcamp, and meetups across LATAM & Europe
- •Topics: Rust, Blockchain & MEV, Zero-Knowledge, .NET, Software Architecture, Design Patterns, AI / LLM systems, Distributed Systems
- •Open-source contribution: contributed to the REVM community by reverse-engineering Geth and Reth internals during MEV infrastructure work at Borderless
- •Active YouTube channel with technical deep-dives on Rust, blockchain, AI, and software architecture
Organizations
Net-Baires (.NET Community)
Founder — 01/2015 - Present
100K+ members, 10+ years building Argentina's largest .NET developer community
Crypto Para Mortales (Conference)
Founder — 01/2023 - Present
Blockchain & crypto education conference
Patrones Para Mortales
Founder — 03/2020 - Present
Design patterns educational content
Languages
Spanish
Native or Bilingual Proficiency
English
Full Professional Proficiency
Performance Arts
- •Stage Magic — Member of Círculo Mágico de España, performing live shows with storytelling and misdirection
- •Stand-up Comedy — Open mics and comedy nights, developing improvisation under pressure
- •Theater & Improv — 10+ years performing live, applied to team facilitation and high-stakes communication
- •Hypnosis & Mentalism — Studying suggestion, non-verbal communication, and audience psychology