Oleksandr Stepaniuk — Full-Stack Developer & System Architect

React Native· TypeScript· Ollama LLM· Google Gemini AI· RAG Search· Expo SDK 54· Express.js· Prisma ORM· PostgreSQL· SQLite ×8· Python· Node.js· Docker· Docker Compose· iOS / Android· React.js· Microservices· REST API· WebSockets· Redis· Supabase· Vector DB· Telegram Bot API· JWT Auth· OAuth 2.0· GitHub Actions· CI/CD· Nginx· EasyOCR· Tesseract· VIN Decoder API· OBD2 IoT· Stripe API· 30+ APIs· Jest Testing· E2E Tests· Java· Vite + React· Deep Analytics· Dual-Write Pattern· React Native· TypeScript· Ollama LLM· Google Gemini AI· RAG Search· Expo SDK 54· Express.js· Prisma ORM· PostgreSQL· SQLite ×8· Python· Node.js· Docker· Docker Compose· iOS / Android· React.js· Microservices· REST API· WebSockets· Redis· Supabase· Vector DB· Telegram Bot API· JWT Auth· OAuth 2.0· GitHub Actions· CI/CD· Nginx· EasyOCR· Tesseract· VIN Decoder API· OBD2 IoT· Stripe API· 30+ APIs· Jest Testing· E2E Tests· Java· Vite + React· Deep Analytics· Dual-Write Pattern·

About

oleksandr@würzburg ~ profile.sh

$whoami

Oleksandr Stepaniuk — Ecosystem Architect
📍 Würzburg, Bavaria · 🇩🇪 DE / 🇺🇦 UA
⏱ 11+ years building complex systems

$cat focus.txt

CivicTech · AI Integration · Mobile Dev
Building systems that solve real problems

$ls projects/

gentrust-mobility/ v5.1.8
automobility/ v1.2.0
gov-de-bot/ v5.0 LLM

$cat stack.json | grep primary

"mobile": "React Native · Expo · iOS · Android"
"ai": "Gemini · Ollama · RAG · OCR"
"backend": "Node.js · Express · Prisma · TS"
"db": "PostgreSQL · SQLite×8 · Redis · Vector"
"devops": "Docker · CI/CD · Nginx · Linux"
"apis": "30+ integrations"
"testing": "Jest · Integration · E2E"
"lang": ["TypeScript","Python","Java","Bash"]

$echo $STATUS

OPEN TO OPPORTUNITIES ▌

I am a solution-oriented systems engineer and serial entrepreneur with over 11 years of experience designing complex technical and commercial ecosystems. I build cross-platform mobile apps (iOS & Android via React Native), connect 30+ external APIs, architect multi-database systems, integrate AI/LLM models, and deploy everything via Docker + CI/CD pipelines — all in a single project.

My stack spans the full spectrum: from React Native & Node.js on the surface, through PostgreSQL, Redis & Vector DBs in the middle, to Ollama LLM, RAG search & OCR at the intelligence layer. I cover testing (Jest, E2E), deep analytics, service mesh and self-healing architectures — because production systems must never fail.

📱iOS & Android

🧠AI-Driven Dev

🏗️System Architecture

🔧Self-Healing Systems

🏙️Smart City Solutions

📊Deep Analytics

🔗30+ API Integrations

🐳Docker & DevOps

🧪Testing & QA

🤖AI Automation

🗄️Multi-DB Systems

🛡️Stress Resistant

Experience

2024 — Present

Ecosystem Architect & Full-Stack Developer

selbstständig · Würzburg 🇩🇪

Designing and building 3 production-ready platforms simultaneously. Cross-platform mobile apps for iOS & Android, AI/LLM integration, microservice architectures with 13+ services, 30+ API integrations, multi-database systems, Docker deployments, CI/CD pipelines, deep analytics, E2E testing and self-healing infrastructure.

React Native iOS & Android TypeScript Node.js Python Gemini AI Ollama LLM RAG / Vector DB PostgreSQL SQLite ×8 Redis Supabase Prisma ORM Docker Docker Compose CI/CD GitHub Actions Nginx REST API WebSockets JWT / OAuth 2.0 30+ API Integrations Telegram Bot API EasyOCR Jest / E2E Tests Microservices Dual-Write Pattern Deep Analytics

03/2025 — Present

KFZ Mechatroniker

Kfz Denis Belov · Würzburg 🇩🇪

Diagnosis of mechanical & electronic faults. Engine overhaul and complex vehicle systems repair. Parallel intensive German language courses for integration.

Motor Control Engine Repair OBD2 Diagnostics Wartung & Reparaturen

2013 — 2023

Serial Entrepreneur

selbstständig · Ukraine 🇺🇦

10 years running a trading company with store management. Successfully managed B2G government food supply contracts requiring highest precision in logistics and QA. Expert in microelectronics repair (smartphones, laptops) and security systems.

B2G Contracts Store Management Microelectronics Repair Security Systems AI Automation Business Analytics Team Leadership Logistics & QA

2012 — 2013

Systems Engineer

Ukrposhta · Ukraine 🇺🇦

Responsible for IT infrastructure and communication networks across 5 cities.

IT Infrastructure Network Engineering 5 Cities System Administration

Education

2013 — 2016

Bachelor's Degree

National University of Food Technologies · Kyiv 🇺🇦

Automation of Computer Systems & Computer-Integrated Technologies.

AutomationComputer Systems

2010 — 2013

Junior Specialist — Software Developer

RDAK · Rivne 🇺🇦

Software development. Foundation in engineering and applied programming.

Software DevEngineering

Tech Stack

React Native

Expo SDK 54

iOS / Android

PWA

React.js

Vite + React

TypeScript

JavaScript ES2024

Node.js

Express.js

REST API

WebSockets

PostgreSQL

SQLite ×8

Supabase

Prisma ORM

Redis

Vector DB

Google Gemini AI

Ollama LLM

Llama 3.2

RAG Search

EasyOCR

Tesseract OCR

OpenAI API

AI Automation

Python

Java

Bash / Shell

JWT Auth

OAuth 2.0

bcrypt

HTTPS / SSL

Docker

Docker Compose

CI/CD

GitHub Actions

Nginx

Linux / Ubuntu

Telegram Bot API

Google Maps API

VIN Decoder API

OBD2 IoT

Expo Push

FCM / APNS

Stripe API

SendGrid

Twilio SMS

Bundestag API

Jest

Unit Testing

Integration Tests

E2E Testing

Microservices

Dual-Write Pattern

Event-Driven

Multi-DB Architecture

Self-Healing Systems

Service Mesh

Deep Analytics

System Monitoring

Performance Profiling

Log Management

Projects

GenTrust Mobility 2026 · v5.1.8

CivicTech platform engaging youth in city development. Google Gemini AI auto-classifies urban problems and routes to 8 departments. Multi-database Dual-Write architecture, 13 microservices, Dignity Score economy, 4 Telegram bots.

React NativeExpo SDK 54 Gemini AITypeScript Prisma + SQLite ×8Telegram API

↗

Automobility 2026 · v1.2.0

Mobile-First platform for calling a mechanic to your home. Smart VIN decoder auto-detects oil volume & brake specs. AI quote generation from photos, IoT OBD2 scanners, B2B Fleet Management for taxi fleets and Glovo/Bolt.

React NativeAI Quote Gen VIN Decoder APIOBD2 IoT PostgreSQLSupabase

↗

Gov.de Bot 2026 · v5.0 LLM

AI bot for analyzing German legal letters. Database of 307,496 paragraphs from all Bundestag laws (903MB), Ollama Llama 3.2 as the brain, RAG search in milliseconds, OCR photo recognition. Response: 6000+ chars UA + ready letter DE (DIN 5008).

PythonOllama Llama 3.2 RAG Vector DBEasyOCR Telegram API307K Gesetze

↗

OLEKSANDR STEPANIUK ARCHITECT

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