AI · Blockchain · Technical Leadership

SergeyNemesh.

AI DeveloperTech LeadBlockchain Expert

A technical leader with 15 years of experience: I create, ship, and lead complex technology products — from architecture to team. Today I turn artificial intelligence into measurable business value.

Get in touch View work

Bratislava, Slovakia · Hybrid / Remote

15+ years in tech

15+

years in IT and systems architecture

CTO / CEO

across 7+ product companies

60+

engineers led

25+

projects and systems shipped

About

Technology that solves real business problems.

My passion is applying cutting-edge technology to solve real business problems. Right now the focus is artificial intelligence and embedding it into existing processes.

I specialize in building AI solutions and, critically, integrating them effectively into the business. I help companies harness the power of AI to optimize operations, improve customer experience, and create new competitive advantages — working with frameworks like Agno, LlamaIndex, and Autogen.

Separately, I embed AI tools directly into the development process — accelerating product delivery and improving quality, reliability, and adaptability across the entire lifecycle.

My expertise reaches beyond AI: deep experience in blockchain, high-load systems, and full-stack development (Python, Go, microservices). Over the years I've delivered projects in MedTech, FinTech/crypto, and business tooling.

Artificial IntelligenceAI IntegrationTechnical LeadershipSoftware ArchitectureBlockchainHigh-Load Systems

01 — What I do

Expertise.

Full cycle: from research and architecture to production, team, and 24×7 operations.

AI & LLM Engineering

Multi-agent systems, RAG, and production AI integration.

Agno FrameworkLlamaIndexAutogenMagenticOneOpenAI APIMulti-AgentVoice / Docs AI

Blockchain & Web3

Smart contracts, cross-chain bridges, tokens, and DeFi infrastructure.

SolidityRustEthereumCosmosBSCHederaCross-chain BridgesSmart Contracts

Software Architecture

High-load, microservices, full-stack, and reliable DevOps.

PythonGoMicroservicesREST APIsPostgreSQLMySQL · OracleCI/CD · DevOpsHigh-Load

Technical Leadership

Tech strategy, hiring, and growing teams up to 60+ engineers.

Tech StrategyTeam BuildingGDPR / HIPAAPMBOK · ITILSCRUMIncident Mgmt 24×7

02 — Path

Experience.

Over a decade as a CTO — from blockchain startups to IT companies with offices around the world.

2024 — present

Chief Technology Officer

Healthy4u Medical TechnologiesSlovakia · MedTech

I lead the technology vision and delivery of an iOS health AI assistant: a secure, scalable platform, iOS / backend / AI teams, LLM integration (OpenAI, Agno), and GDPR/HIPAA compliance.

AI / LLMiOSDevOps · CI/CDHIPAA

2024 — present

CEO & CTO

Stalwart AISlovakia · AI

Growth strategy and technical leadership: team building, infrastructure modernization, AI training protocols and metrics, and work with investors and the market.

AI StrategyBig DataLeadership

2019 — 2023

Chief Technical Officer

OverGoldBratislava · FinTech / Crypto

Led the engineering department (25–60 engineers), set strategy and principles, built the technical ecosystem and infrastructure, and owned 24×7 incident management and engineering maturity.

BlockchainSoftware ArchitectureTeam 60+

2017 — 2019

Chief Technical Officer

INN4ScienceUkraine · Blockchain

Systems architecture and project management: service architecture, requirements validation, team coordination, and scaling and integration strategy.

System ArchitectureBlockchainBig Data

2014 — 2017

Chief Technical Officer

Intersog · SuntechsoftUkraine · Custom Software

A portfolio of enterprise projects and development teams: application architecture, technical specifications, enterprise system rollouts, and PMBOK / ITIL / SCRUM methodologies. Products included the DMarket blockchain marketplace.

Solidity · GoRESTful APIsEnterprise

2009 — 2014

CIO / Head of IT

PSD2HTMLTOP-25 · 550+ staff

IT strategy for a company with 6 offices (USA, Ukraine, India, Costa Rica, Pakistan, Nepal): web development (250+ developers), a KPI system, 24×7 ERP at 99.9% uptime, budgeting, and infrastructure audits.

IT StrategyERP 99.9%250+ devs

Earlier: IT Project Manager at DHL · Planning & Production Manager at InBev · System Administrator. Education — Odessa National 'I.I. Mechnikov' University.

03 — Selected

Work & systems.

Products I designed and shipped to production — in MedTech, AI, and Web3.

webconsul.app/expert/dashboard

Consul — кабинет эксперта: выплаты и аналитика

AI · Expert Marketplace2025 — present

Webconsul — Expert Finder

CTO · Architecture, AI, team

A marketplace that connects clients with vetted experts for a specific task. AI parses the request, matches suitable specialists and ranks them by relevance, while consultations, chat, and real-time video calls happen right inside the portal — with separate client and expert dashboards, secure payments, ratings, and reviews. It's built on a high-load realtime architecture across several languages and services.

Open webconsul.app

GoPythonReactSwiftKafkaPostgreSQLCentrifugoCitadel

4 AI agents online

87Health Score

AI Health Intelligence

MedTech · AI Platform2024 — present

Healthy4U

CTO · Architecture, AI, team

An AI platform that combines artificial intelligence and advanced technology for medical consultations and personal support. A multi-agent system processes user requests and delivers precise, personalized recommendations — with data encrypted at rest and in transit.

Open healthy4u.world

PythonGoPostgreSQLMagenticOne Multi-AgentOpenAI APIiOS · Web

Computer Vision · iOS2025

FloriZen — AI Plant Doctor

Tech Lead · AI & Product

A pocket plant doctor, not just a plant identifier: take a photo and in 15 seconds the app not only recognizes the species but also diagnoses it, explaining exactly what the AI saw. A multi-step check analyzes leaves, soil, and signs of stress, then delivers a step-by-step care plan with concrete timelines — what to water, what to feed, how to save it. Per-plant history, smart reminders, and EU-grade privacy: GDPR, Sign in with Apple, no dark patterns.

Download on the App Store florizen.app

Computer VisionLLMSwift · iOSImage AnalysisSubscriptions

arena.dev-ocean.net

Web3 · Fan EconomyBlockchain

Blockchain Sports · Arena

Tech Lead · Web3 Architecture

A fan-engagement platform: supporters watch and repost content, complete branded challenges, and earn Arena Points that convert into ATLA tokens and can be withdrawn to a wallet. Gamification on top of blockchain infrastructure.

Open arena.dev-ocean.net

Smart ContractsToken EconomyWallet IntegrationHigh-LoadLeaderboards

rework-report · main

1,240commits

23%rework

12scope changes

Effort by zoneRework trend ↗

Commit & Rework Analysis

Engineering Analytics · GitHubInternal Tool

GitHub Analyzer

Architect · Data & Tooling

The tool analyzes a GitHub repository's commit history and builds a clear report: how much work went into each product area, where rework happened, and which requirements changed along the way — and how that affects effort estimates. It helps explain transparently to a client why timelines shifted.

GitHub APIGit HistoryCommit ChurnBig DataBI · LookerReporting

OVGExchanger

Decentralized crypto exchange with no intermediaries.

DEX · Blockchain

StarBridge

Cross-chain bridge between Cosmos and Binance Smart Chain.

Cross-chain Bridge

VipCoin Gold

A cryptocurrency 100% backed by physical gold.

Asset-backed Token

DMarket

Decentralized marketplace for in-game items on blockchain.