Контактная информация

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Опыт работы

Backend програміст

с 08.2025 по наст. время (8 месяцев)

- Engineered FastAPI microservices (PostgreSQL + Redis) ingesting 200k+ records/day with <100 ms p95 latency.
- Built Scrapy + Playwright pipelines with captcha bypass, retries & deduplication — 99%+ delivery rate.
- Designed RabbitMQ-driven ETL workflows replacing manual exports, cutting processing time by ~60%.
- Delivered Shopify-compatible CSV exporters handling complex product/variant logic for e-commerce clients.
- Extract data from websocket in real-time and save to database

Backend програміст

с 09.2023 по 08.2025 (2 года)
Dex223, Дистанційно (IT)

- Built REST & GraphQL APIs aggregating on-chain and off-chain data, powering live DeFi.
- Developed async FastAPI services + Redis caching serving 1M+ daily events with high availability.
- Created Web3.py event listeners and ETL pipelines for marketing analytics and user attribution.
- Build custom CRM for marketing department for optimize inner process

Backend Developer & Data Delivery

с 08.2022 по 09.2023 (1 год 2 месяца)
Callisto Enterprise, Дистанційно (IT)

Developed and supported backend services for corporate clients.
Integrated blockchain technologies using Web3.py, Ether.js, and Hardhat.
Optimized web application performance and security.
Make API use FastAPI

Python developer

с 06.2021 по 08.2022 (1 год 3 месяца)
DataOX, Миколаїв (IT)

- Scraped and processed 10M+ rows of structured data using Scrapy, - BeautifulSoup, and Pandas.
- Built Flask/Django internal APIs; optimised slow queries cutting average pipeline runtime by 35%.
- Creating scripts for automation with Selenium

Python developer

с 03.2020 по 06.2021 (1 год 4 месяца)
Upwork - Freelancer, Дистанційно (IT)

- Developed Python & Node.js backend solutions for 10+ international clients across e-commerce and SaaS.
- Automated deployment and scaling with AWS (EC2, S3) and Docker; achieved 99.5% uptime SLA.

Образование

КПІ

ФПМ, прекладна математика, Київ
Высшее, с 2015 по 2019 (4 года)

Знания и навыки

• Python
• Git
• SQL
• FastAPI
• PostgreSQL
• Redis
• MongoDB
• Elasticsearch
• Scrapy
• Playwright
• Selenium
• Pandas
• NumPy
• OpenCV
• Celery
• FastStream
• RebbitMQ
• Django
• Django Rest Framework
• Flask
• Web3.py
• TheGraph
• SQLAlchemy
• DjangoORM
• HTML
• CSS
• JavaScript
• Docker
• Kubernetes
• AWS
• Docker Compose
• REST API
• GraphQL
• ChatGPT API

Знание языков

• Украинский — свободно
• Английский — средний

Дополнительная информация

Kostya Ostapenko

Contact:
e-mail: [открыть контакты](см. выше в блоке «контактная информация»)
telegram @kostya_ostapenko

Python Developer with 5+ years delivering production-grade backend systems, high-throughput data pipelines, and
automation platforms. Built distributed scrapers processing 200k+ records/day, async FastAPI services handling
millions of events, and blockchain data APIs powering live DeFi products. Strong ownership mindset — from
architecture to deployment.