Arhip

Arhip Dolya
Python Developer

About me
Tech enthusiast using diverse skills to create positive
change through innovation.
Contact
Skills
Phone Python, Django, FastAPI, BlackSheep, LangChain,
Docker, PostgreSQL, MySQL, Clickhouse, InfluxDB,
[відкрити контакти](див. вище в блоці «контактна інформація»)
MongoDB, Redis, AWS S3 (MinIO), Celery, RabbitMQ,
Email Kafka, Grafana, Prometheus, Loki, Kibana, Linux
[відкрити контакти](див. вище в блоці «контактна інформація»)
Telegram Work experience
@ArhipDolya
Backend Engineer Poklyk
Viber March 2025 - Now
[відкрити контакти](див. вище в блоці «контактна інформація»)
Led full-stack refactoring to migrate complex commission
calculation logic from frontend to backend delivering

Languages cleaner architecture and better user experience for salary
reporting.

Improved API performance and SLA by optimizing complex
English - Upper
SQL queries, introducing database indexing, and resolving
intermediate (B2) severe N+1 query issues. Reduced response times for data-
heavy endpoints from over 100 seconds to under 3
Ukrainian - Native (C2) seconds

Russian - Native (C2) Enhanced system stability and user experience under high
concurrency by implementing an automatic retry
mechanism and robust error handling, eliminating HTTP
500 errors caused by database serialization failures
References
GitHub
Backend Engineer CheckBox
https://github.com/Arhip
Dolya August 2024 - February 2025

LinkedIn Developed warehouse transfer system with GIN TRGM
[відкрити контакти](див. вище в блоці «контактна інформація») search optimization and RESTful APIs, improving
arhip-dolya-4523bb217/ inventory tracking through efficient database indexing.
Enhanced digital signature registration service by
implementing Kafka event-driven architecture, replacing
HTTP callback mechanisms with direct producer-
consumer communication, resulting in reduced latency
and improved system reliability through asynchronous
processing.

Led comprehensive test coverage improvement initiative,
expanding test coverage from 32.4% to 86.2% for critical
business service, ensuring robust code quality and
reducing production issues.

Implemented a distributed task processing system using
Celery that improved payment processing performance
through consistent hash-based routing and queue
partitioning.

Backend/LLM Engineer XAgencyAI
October 2023 - July 2024

Developed and enhanced AI models using LangChain,
employing Langsmith for performance metrics and
prompt optimization, leading to improved model
efficiency.

Engineered and launched a high-performance FastAPI
microservice for efficient file transcription, improving
processing speed and scalability.

Implemented CI/CD pipelines, improving deployment
efficiency.

Set up automated pre-commit hooks to enforce
consistent coding standards, improving code quality and
team collaboration.

Backend Developer Atmo
October 2022 - September 2023

Engineered high-performance Django Rest Framework API
endpoints for an air quality monitoring platform, optimizing
data processing and retrieval.

Increased system reliability by implementing a dead letter
queue in RabbitMQ.
Set up Prometheus, Grafana, and Loki for monitoring and
logging.