Олександр

OLEXANDR DASHCHENKO
BACKEND DEVELOPER

📍 Kyiv, Ukraine 📞 [открыть контакты](см. выше в блоке «контактная информация») ✉️ [открыть контакты](см. выше в блоке «контактная информация») 🔗 GitHub 📱 Telegram

SUMMARY

Backend Engineer with 5+ years of experience in software engineering, including 3+ years in production
environments. Focused on designing and operating distributed backend systems, with expertise in
microservices architecture, blockchain integrations, and AI-driven applications. Experienced in building
systems from the ground up — defining architecture, implementing core services, and scaling to
production. Strong emphasis on reliability, system design, and clean, maintainable code.

EXPERIENCE

AI Customer Support Agent Apr 2026 — Present
Designed and built an end-to-end AI customer support platform from scratch: LangGraph agent with tool
calling, FastAPI backend, and React admin panel — owned the full stack end-to-end.
Implemented RAG over a dynamic knowledge base (pgvector) and real-time WebSocket streaming with
live human takeover for operators.
Built agent tools for product catalog search, semantic knowledge retrieval, and escalation handoff to
human support.

AI Agent Platform Sep 2025 — Apr 2026
Built a backend for an AI agent supporting text, voice, and image input.
Implemented RAG (Retrieval-Augmented Generation) for context-aware document retrieval and query
grounding.
Integrated LLM workflows with prompt tracking (Langfuse); added tools for web search and document
generation.
Built APIs to run and manage agent tasks; implemented subscription billing for paid premium features.
Optimized response time and handled high concurrent request loads.

Crypto Payment System Jun 2024 — Sep 2025
Architected a microservices-based payment system for processing cryptocurrency transactions across
multiple blockchains (TON, TRON, Ethereum, Solana, BSC).
Integrated third-party providers (Alchemy) and direct RPC interaction; developed wallet management with
automated fund sweeping and balance aggregation.
Designed a unified API gateway for seamless third-party service integration.
Ensured system resilience through idempotent processing, retry strategies, and fault-tolerant service
design.
Crypto Games Platform Jan 2023 — Sep 2025
Built modular backend architecture reused across multiple client applications and interfaces.
Developed and maintained high-load API services handling user sessions, game logic, and financial
operations.
Implemented end-to-end cryptocurrency payment processing: deposits, withdrawals, and transaction
verification.
Built an internationalization pipeline with automated AI-translation workflows and centralized localization
management.
Developed React admin dashboard with analytics, user management, and reporting; maintained Vue.js web
client.

SKILLS

Languages: Python, JavaScript (Node.js)

Frameworks & Toolkits: FastAPI, aiohttp, LangChain, LangGraph, SQLAlchemy, Alembic, aiogram, i18n

Databases & Brokers: PostgreSQL, pgvector, MongoDB, Redis, SQLite

DevOps & Infrastructure: Docker, Docker Compose, Nginx, Linux, SSH, DigitalOcean, Git

Management: Jira, Confluence, Trello

EDUCATION

Kyiv Polytechnic Institute — Bachelor, Mechanical Engineering 2017 — 2021

LANGUAGES

English: B2
Ukrainian: Native