Сергій

Serhii Dobrovolskyi
Python Backend Engineer — Databases, ERP & Automation

Location: Ukraine · Remote

Email: [open contact info](look above in the "contact info" section)
Telegram: @sergey_dobrovolskj
LinkedIn: [open contact info](look above in the "contact info" section)
GitHub: github.com/dsvsergey

PROFILE

Backend engineer with 10+ years building production systems in Python, focused on
database design, SQL, and business-process automation. I design scalable, fault-tolerant
data-intensive services (FastAPI, PostgreSQL) and have hands-on ERP experience on
Frappe/ERPNext — custom business logic, workflow automation, external integrations,
and APIs. I have migrated legacy systems to modern platforms and pick up new ERP
frameworks (e.g. Odoo) quickly.

KEY SKILLS

Backend & API — Python (FastAPI, Flask, Django), REST API and WebSocket design,
microservice architecture

Data & Databases — SQL (complex queries, window functions, CTEs), PostgreSQL,
MySQL, schema design, indexing, query optimization, stored procedures, rule engines,
ETL/ELT pipelines

ERP — Frappe Framework, ERPNext, custom DocTypes, workflow design, business-
process automation, ERP integrations

MLOps / AI (applied) — LLM integrations (OpenAI API), model serving via FastAPI
inference APIs, async background processing

Infrastructure — Docker, Docker Compose, CI/CD, Linux (production)

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KEY ACHIEVEMENTS

• Designed and maintained production databases of 90+ tables and 100K+ records
with a focus on integrity and performance
• Built SQL rule engines and validation systems that improved product-data quality
• Implemented complex business logic through multi-stage SQL transformations and
temporary tables
• Optimized heavy queries, significantly improving the performance of high-load
systems
• Delivered ETL/ELT pipelines that kept data consistent across multiple sources

WORK EXPERIENCE

DipDev Studio — Backend / Database Engineer

2023 – present

• Built production-ready, data-intensive backend services on FastAPI with a focus on
performance, scalability, and reliability
• Designed database schemas and data models, and implemented SQL-based data
processing and validation
• Optimized queries for large datasets and high-load systems

Independent Backend / Automation Engineer — Contract

2022 – present

• Integrated marketing and analytics APIs (Meta Ads API, Google APIs) and built ETL
pipelines for business data
• Automated data collection, transformation, and reporting, reducing manual
operations
• Engineered backend integrations between external services and internal systems
using async background processing

BZBGEAR — Backend / Database Engineer

2016 – 2023

• Designed and maintained production databases (90+ tables, 100K+ records) with a
focus on integrity and performance
• Built SQL rule engines and validation systems for product-data quality
• Implemented stored procedures and complex business logic via multi-stage SQL
with temporary tables

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 • Optimized heavy queries, significantly improving the performance of high-load
processes
• Developed and maintained WooCommerce REST API integrations: product sync,
stock, pricing, and catalog management
• Automated product-feed generation and catalog/metadata processing for e-
commerce platforms
• Built internal tooling for processing, validating, and quality-controlling product data

VBto Converter — Software Engineer

2008 – 2016

• Developed backend logic and data-processing tools
• Maintained and supported legacy systems

SELECTED PROJECTS

Product Data Validation Engine

• Designed a SQL rule engine that automated detection of inconsistencies across
large datasets
• Implemented multi-condition validation logic and an internal data-quality tracking
system

AI-Powered Product Description Generator

• Built a FastAPI service for AI-assisted content generation
• Designed request/response pipelines for inference endpoints, focused on
performance and reliability

EDUCATION

Central Ukrainian National Technical University

Specialist Degree in Systems Engineering

1994 – 1999

LANGUAGES

• Ukrainian — native
• English — working proficiency

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