Назар

NAZAR KLYMCHUK
Python Backend Engineer

[open contact info](look above in the "contact info" section) | Lutsk, Ukraine

PROFESSIONAL SUMMARY
Python Backend Engineer with 4+ years of commercial experience and 50+ delivered production backend,
automation, and integration systems. Strong in async Python, backend architecture, PostgreSQL/Redis,
distributed communication, third-party integrations, and production delivery. Experienced in taking systems
from domain design and API contracts through persistence, deployment, and support.

WORK EXPERIENCE

Freelance Backend Engineer Mar 2022 - Present
Contract / Client Projects
Delivered 50+ production backend, automation, and integration systems across independent client contracts
and long-term engagements.
Built asynchronous APIs and services with FastAPI/aiohttp, PostgreSQL, Redis, SQLAlchemy, and background
schedulers.
Integrated payment providers, blockchain APIs, webhooks, Google Sheets, and Telegram/Discord/Viber
platforms.
Designed database schemas, service boundaries, persistence layers, containerized deployments, and
production support workflows.

Lead Backend Engineer 2024 - 2026
QuaronSoftware
Led backend architecture and core API development across client-facing systems and integrations.
Applied Clean Architecture, modular boundaries, Repository/Unit of Work, and event-driven or gRPC
communication where appropriate.
Owned Docker-based delivery, CI/CD, deployments, reliability, and production troubleshooting.
Coordinated backend work in a team of up to 10 people.

Python Backend Developer 2023 - 2024
Arowwai Industries
Implemented backend logic, APIs, database schemas, and asynchronous Python services for production
projects.
Contributed to architecture decisions, code reviews, deployment workflows, and infrastructure using
Docker/Kubernetes.

PROJECTS

TED 2026 - Present
Personal Assistant & Homelab Platform
Personal event-driven backend platform designed as a practical environment for automation, monitoring,
scheduling, and distributed service communication.
Built around NATS JetStream with event-based communication between independent services.
Designed a centralized scheduler for reminders, monitoring jobs, backups, and delayed tasks.
Uses service-owned persistence, PostgreSQL, Redis, Docker, and modular Python packages.
Designed with fault isolation, extensibility, and future integration with local devices and services in mind.

BookFlow Dec 2025 - Present
Multi-tenant booking automation platform for small businesses built around Telegram.
Automates scheduling, booking availability, and customer interaction.
Designed as a multi-tenant backend capable of supporting isolated business configurations and workflows.
Used in real booking workflows by multiple small businesses.

Snizhok 2021 - 2024
Student Platform
Student productivity and study-management platform originally developed as a personal project and later
expanded into a multi-group system.
Provided class schedules, homework, remote-class links, weather information, group notes, reminders, and
shared task tracking.
Implemented automated reminders for assignments, practical work, and laboratory deadlines.
Reworked the architecture during a major product update and tested the new version with real student
groups.
Reached 132 registered users across 12 study groups/classes by 2024.

Aiober 2023 - 2024
Open-source asynchronous Python library for developing Viber bots.
Provided a structured abstraction over the Viber API and simplified asynchronous bot development.
Designed around reusable components and a clearer application structure compared with direct API
interaction.

SKILLS
Languages: Communication & APIs:
Python, basic/current Rust REST APIs, Webhooks, gRPC, NATS JetStream,
Backend: third-party API integrations
FastAPI, aiohttp, aiogram 3, Pydantic, Infrastructure:
asynchronous Python Docker, Kubernetes, Nginx, GitHub Actions, CI/
Databases & Persistence: CD, Linux
PostgreSQL, Redis, SQLite, MySQL, Automation & Integrations:
SQLAlchemy, Alembic Telegram API, Discord API, Viber API, payment
Architecture & Design: providers, blockchain APIs, Google Sheets,
Clean Architecture, Modular Monolith, Playwright
Microservices, Repository Pattern, Unit of Tools:
Work, Dependency Injection, Event-Driven Git, GitHub, Postman
Architecture

CURRENT DEVELOPMENT
Rust & Solana Development
Currently studying Rust and Solana development through Solana Startup Terminal, including:
Solana RPC and Devnet interaction
transactions and account models
blockchain integrations
on-chain program development
Rust fundamentals for blockchain applications
This is an active learning direction and is not presented as commercial Rust/Solana experience.

LANGUAGES
Ukrainian: Native
English: B1-B2
Polish: A2