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Oleksii Gorokh
Backend Python Developer / AI Engineer
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Summary
Backend Python developer with 3 years of experience building scalable web services and APIs. Worked on SaaS
platforms with microservice architecture as well as internal business tools. Recent experience includes applying LLM
technologies (LangChain, RAG) to build AI-assisted product features.

Technical Skills
Languages: Python
Frameworks: FastAPI, Django, Django REST Framework
ORM: SQLAlchemy, Django ORM
Databases: PostgreSQL, ClickHouse, Redis, Pinecone
Messaging: Kafka, Celery
Tools & Infra: Docker, Git, AWS, GitLab CI/CD, Alembic, pytest, factory_boy
AI/LLM: LangChain, RAG, OpenAI
Other: REST API, microservices, gRPC basics

Experience
Uniqit Group LLC · Backend Python Developer / AI Engineer Aug 2024 - July 2026 · 1 yr 11 mos
Developed and maintained microservices for a SaaS platform automating advertising campaigns across Facebook,
Google, and TikTok. Stack: Python, FastAPI, PostgreSQL, Redis, Kafka, AWS, LangChain, RAG, Pinecone.
Responsibilities:
• Owned and developed the billing service: integrated Stripe and LiqPay payment systems, implemented payment
webhook processing, and managed client balance lifecycle including top-ups, spend deductions, and transaction
history.
• Extended the authorization service: designed and implemented new roles and access levels to support complex
multi-tenant client workflows.
• Maintained and optimized the background task service responsible for automated campaign rule execution across
all clients.
• Participated as a team member in building an AI-powered client assistant that helps clients with advertising
campaign questions and documentation lookup; implemented a RAG pipeline using LangChain with Pinecone as
the vector store for semantic search over the knowledge base.
Achievements:
• Implemented a risk-based protection system for financial operations, including fraud detection for top-ups and
anomaly detection for ad spend, with automated decision-making (approve / block / pause), reducing fraudulent
activity and preventing overspending.
• Refactored the background task service from sequential to parallel execution using Celery task groups, reducing
one automation cycle from 10+ minutes to 2–4 minutes.
• Contributed to the LangChain + Pinecone RAG integration for the AI client assistant, enabling clients to get
accurate answers about campaigns and documentation without contacting support.
• Extended the authorization service: designed and implemented new roles and access levels to support complex
multi-tenant client workflows.

DigitalBrother · Backend Python Developer May 2023 - Aug 2024 · 1 yr 2 mos
Developed an internal CRM system for a client company, focusing on performance, scalability, and reliability.
Responsibilities:
• Designed and implemented RESTful APIs using Django REST Framework.
• Optimized PostgreSQL queries: introduced composite indexes, and improved query execution plans.
• Implemented asynchronous background processing with Celery (notifications, user activity aggregation, periodic
tasks).
• Wrote unit and integration tests (pytest + factory_boy), achieving ~70% coverage for critical modules.
 • Containerized the application using Docker and contributed to CI/CD pipeline setup in GitLab.
Achievements:
• Reduced average API response time by ~30% through query optimization and caching strategies.
• Improved system stability by offloading heavy operations to background workers, decreasing request timeouts.
• Increased code reliability and reduced regression issues via automated testing.
• Contributed to faster deployment cycles by helping establish CI/CD processes.

Education
KAI Tech (affiliated with the Kyiv Aviation Institute) 2021 - 2025
Software Engineering

Languages
English - B2 (Upper-Intermediate) • Ukrainian - Native