Arhip

Arhip Dolya
Python Developer

About me
Python backend engineer with 3+ years of experience
across CRM, finance, warehouse management, retail and
fiscal systems, and IoT. Focused on API performance,

Contact reliable asynchronous processing, and business-critical
workflows.

Phone Skills
Backend: Python, Django/DRF, FastAPI, BlackSheep
[відкрити контакти](див. вище в блоці «контактна інформація») Databases: PostgreSQL, MySQL, MongoDB, ClickHouse,
Email InfluxDB, Pinecone, Redis
Messaging: Celery, RabbitMQ, Kafka, AWS SQS
[відкрити контакти](див. вище в блоці «контактна інформація»)
Infrastructure: Docker, Argo CD, AWS S3, MinIO
Telegram LLM tooling: LangChain, LangGraph, LangSmith,
@ArhipDolya Langfuse
Observability: Prometheus, Grafana, Loki, Kibana
Viber
[відкрити контакти](див. вище в блоці «контактна інформація») Work experience
Backend Engineer Poklyk
March 2025 - Present
Languages CRM & business operations · Finance & warehousing

Saved the company an estimated $8,000 per month by
English - Upper- delivering a partner integration that eliminated the need
for a paid alternative.
intermediate (B2)
Cut data-heavy API response times from over 100
Ukrainian - Native (C2) seconds to under 3 seconds by optimizing SQL, adding
indexes, and resolving N+1 queries.
Russian - Native (C2)
Improved the user experience with faster application
responses by moving analytics to background
processing, eliminating waits for third-party tracking
services.
Links Optimized MongoDB profit-report queries that ran for 8–
23 minutes and saturated CPU, using a targeted
LinkedIn compound index and 2,000-ID batches.
[відкрити контакти](див. вище в блоці «контактна інформація»)
arhip-dolya-4523bb217 Led the migration of commission calculations from
frontend to backend, centralizing business logic for
salary reporting.
GitHub
github.com/ArhipDolya Eliminated HTTP 500 errors from serialization failures
under concurrent load with automatic retries.

Domains Backend Engineer CheckBox
AI business automation September 2024 - March 2025
Finance & warehouse management · Retail & fiscal systems
CRM and business operations
Raised test coverage of a critical business service from
Finance and warehouse
32.4% to 86.2%.
management
Built a warehouse transfer system with REST APIs and
Retail and fiscal systems GIN trigram indexes to improve inventory search and
IoT and analytical data tracking.

Replaced HTTP callbacks with Kafka producer-
consumer messaging in a digital signature registration
service, reducing latency and improving reliability.

Improved payment processing performance by
partitioning Celery queues and routing tasks with
consistent hashing.

Backend/LLM Engineer XAgencyAI
October 2023 - September 2024
AI business automation

Built and improved LLM workflows with LangChain, using
LangSmith to track performance and refine prompts.

Built and launched a FastAPI microservice for file
transcription, improving processing performance and
scalability.

Automated deployments with CI/CD pipelines.

Enforced coding standards with pre-commit hooks.

Backend Developer Atmo
October 2022 - September 2023
IoT & analytical data

Built and optimized Django REST Framework APIs for an
air quality monitoring platform, improving data
processing and retrieval.

Added a RabbitMQ dead-letter queue to improve
message processing reliability.

Set up metrics, dashboards, and logging with
Prometheus, Grafana, and Loki.