Ivan

IVAN BATAIEV Open to Remote

Backend & Integration Engineer · Python · REST API · CRM/ERP Integrations

✉[відкрити контакти](див. вище в блоці «контактна інформація»)☎[відкрити контакти](див. вище в блоці «контактна інформація») Switzerland (4+ years residence) [відкрити контакти](див. вище в блоці «контактна інформація»)

Python REST API FastAPI Bitrix24 CRM/ERP PostgreSQL Webhooks OAuth2 Docker 50+ projects

SUMMARY

Backend and Integration Engineer with 8+ years of experience building reliable systems that connect platforms,
automate workflows, and reduce manual work for business teams. Specialized in CRM/ERP integrations, REST APIs, and
Python automation. Delivered 50+ integration projects across real estate, food service, and construction industries.
Based in Switzerland, available for remote positions.

TECHNICAL SKILLS

BACKEND

Python · FastAPI · REST APIs · Async processing · Webhooks · OAuth2

INTEGRATIONS
Bitrix24 · 1C · SmallInvoice · AbaNinja · Postman · API design · ETL

DATABASES
PostgreSQL · SQL · data pipelines · data processing

TOOLS
Docker · Linux · Git · VS Code · CI/CD basics · AI-assisted dev

WORK EXPERIENCE

Integration Engineer · Kochloffel Mahlzeiten Service GmbH — St. Gallen, Switzerland May 2025 – Mar 2026

Python · REST API · SmallInvoice · Abacus AbaNinja
→ Designed and implemented data pipeline extracting and transforming invoice data from SmallInvoice API into Abacus
AbaNinja
→ Built Python scripts for automated data ingestion and scheduled background processing
→ Ensured data consistency through validation, error handling, and monitoring
✦ Automated data flow improved visibility of sales data, enabling better production and delivery planning

Integration Engineer · One Yard Real Estate — Dubai, UAE (Remote) Jun 2025

Python · Bitrix24 · REST API · SQL · Webhooks
→ Built automated backend solution integrating Bitrix24 CRM with external ERP system via REST API
→ Developed flexible payment plan logic with dynamic calculations, reducing manual input significantly
→ Implemented document workflows, notification system, and logging for stable financial operations
✦ Increased transparency of financial data and reduced manual workload in sales and accounting

Integration Engineer (Freelance) · Multiple Construction & Real Estate Companies — Ukraine / 2017 – 2024
Remote
Python · Bitrix24 · 1C · REST API · Webhooks · SQL
→ Delivered 50+ CRM/ERP integration projects for construction and real estate companies across Ukraine
→ Specialized in Bitrix24 ↔ 1C integrations: automated data sync of clients, deals, invoices, and documents
→ Built custom automation workflows, reducing manual data entry by 60–80% per client
→ Developed reusable integration modules used as templates across subsequent projects
→ Managed full project lifecycle: requirements, development, testing, deployment, and support

PORTFOLIO

AppPaymentPlan
Bitrix24 payment plan automation module
github.com/iBatfox/AppPaymentPlan

EDUCATION

Specialist, Engineer
Donetsk Polytechnic Institute, Ukraine
Sep 2006 – Jun 2014

LANGUAGES

Ukrainian Native

Russian Native

English Fluent · C1

German B1 · improving