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Fiverr Pro
Nederlands
$
USD
Nazar K
@nazar_ee
Backend Engineer
Oekraïne
Engels, Oekraïens
Over mij
I'm a Python Backend Engineer with 4+ years of commercial experience and 50+ delivered software solutions.
I specialize in REST APIs, Telegram bots, business automation, payment systems, and third-party integrations.
My main stack includes Python, FastAPI, asyncio, aiogram, PostgreSQL, Redis, SQLAlchemy, and Docker.
I can take a backend project from requirements and architecture through implementation, deployment, and ongoing support.
I value clear communication, realistic deadlines, maintainable code, and client confidentiality.
Skills
Nazar K
offline •
Gemiddelde reactietijd: 1 uur
Bekijk mijn diensten
Regelgebaseerd chatbots
I will build a custom telegram bot with python
Portfolio
Werkervaring
Lead Backend Engineer / Founder
QuaronSoftware • ZZP
Aug 2025 - Present • 1 yr 3 mos
Responsible for backend architecture and core APIs Focused on scalability, reliability, and stability Managed deployments and production support
Freelance
Freelance • Freelance
Feb 2022 - Present • 4 yrs 9 mos
Developed 50+ production backend and automation systems Built async Python backends with PostgreSQL and Redis Integrated external APIs and messaging platforms
Middle Python Backend Engineer
Google • Freelance
Apr 2024 - Oct 2025 • 1 yr 6 mos
Owned development, deployment, and production support of the core asynchronous Python backend, integrating multiple blockchain networks. Implemented application-level per-address locking, transaction-state tracking, and confirmation checks to coordinate concurrent operations, with scheduled retries for failed or timed-out operations. Developed advertising attribution and social-platform integrations for conversion tracking, session management, and API-based automation. Resolved event-loop blocking in a legacy integration by moving long-running synchronous I/O to threads, keeping asynchronous services responsive during external calls.
