┌──●──●──●───────────────────────────────────────────────────────┐
│ tymofii@kyiv: ~/about │
├────────────────────────────────────────────────────────────────┤
│ │
│ $ cat about.md │
│ │
│ Backend engineer focused on system architecture, API │
│ design, and CS fundamentals. I build the internals I │
│ actually want to understand — write-ahead logs, custom │
│ indexing, concurrency models, LLM pipelines — from │
│ scratch, at least once, before trusting a library to │
│ do it for me. │
│ │
│ Currently technical lead on Smarket, a microservices │
│ grocery price-comparison platform in production on │
│ Hetzner. │
│ │
│ $ █ │
│ │
└────────────────────────────────────────────────────────────────┘
┌──●──●──●───────────────────────────────────────────────────────┐
│ tymofii@kyiv: ~/projects │
├────────────────────────────────────────────────────────────────┤
│ │
│ $ ls -la ./projects │
│ │
│ drwxr-xr-x smarket/ [technical lead] │
│ drwxr-xr-x acquiremock/ 81 stars │
│ drwxr-xr-x yaradb/ 34 stars │
│ drwxr-xr-x helix/ 25 stars │
│ drwxr-xr-x sentinel-cli/ AMD Dev Hackathon │
│ drwxr-xr-x gitra/ 3 stars │
│ │
└────────────────────────────────────────────────────────────────┘
Smarket — microservices grocery price-comparison platform [technical lead]
Production deployment on Hetzner. Auth, cart, products_etl, gateway, and a zephyros_agent
AI chat service. Google OAuth2, Redis, three-tier LLM routing (Gemini → Groq → Cerebras).
Python Go FastAPI PostgreSQL Redis Docker Microservices
AcquireMock — financial payment gateway simulator ★ 81
Full transaction lifecycle (Invoice → OTP → Webhook) with idempotency keys, HMAC-SHA256 signed
webhooks, exponential backoff retries, bcrypt card storage mirroring PCI-DSS.
Python FastAPI SQLModel PostgreSQL Cryptography
YaraDB — custom in-memory database engine ★ 34
Built from scratch to study DBMS internals: Write-Ahead Logging for crash recovery, dual
indexing with Hash Index O(1) exact lookups and B-Tree O(log n) range queries.
Python WAL B-Tree Data Structures
Helix — AI-powered API mocking platform ★ 25
Zero-config mock server guaranteeing JSON-schema-compliant responses via pluggable LLM
providers (Groq, DeepSeek, Ollama), Redis semantic caching, chaos-engineering module.
Python FastAPI Redis LLMs
Sentinel CLI — multi-agent code analysis engine AMD Developer Hackathon
Async Scatter-Process-Gather pipeline routing analysis tasks dynamically across models,
optimized for AMD ROCm local inference.
Python AsyncIO AMD ROCm Ollama
Gitra — local AI code explorer ★ 3
RAG-powered natural-language Q&A over any public Git repository via the Gemini API.
Python RAG Gemini API Vector Search
┌──●──●──●───────────────────────────────────────────────────────┐
│ tymofii@kyiv: ~/stack │
├────────────────────────────────────────────────────────────────┤
│ │
│ $ cat stack.yaml │
│ │
│ languages: Python (Adv) · C#/.NET · Go · C++ · TS │
│ backend: FastAPI · Django (DRF) · ASP.NET Core · Async │
│ ai_llm: OpenAI · Anthropic · OpenRouter · RAG · YOLOv8 │
│ databases: PostgreSQL · MongoDB · Redis · MySQL · SQLite │
│ orm: SQLAlchemy · SQLModel · EF Core · Django ORM │
│ devops: Docker · GH Actions · Linux · Azure · Hetzner │
│ │
└────────────────────────────────────────────────────────────────┘
┌──●──●──●───────────────────────────────────────────────────────┐
│ tymofii@kyiv: ~ │
├────────────────────────────────────────────────────────────────┤
│ │
│ $ ./run.sh --status │
│ │
│ [ OK ] shipping Smarket to production │
│ [ OK ] preparing academic defense │
│ [ .. ] self-hosted PostgreSQL migration │
│ [ .. ] Fractalyth — music production, djent/thall │
│ │
│ process exited with code 0 │
│ $ █ │
└────────────────────────────────────────────────────────────────┘