Egor Voronianskii

Senior Java Developer / Tech Lead

About

Work Experience

Lead Java Developer — Fazum LLC

January 2023 — Present · 3 years 3 months

Outsourcing & system integration company. Working in the banking guarantees domain for leading banks (top 30), leading a team of up to 10 engineers.

Responsibilities

• Architectural decision-making and implementation in a microservices environment (~90 services)
• Developed a fault-tolerant API for creating bank guarantee applications regardless of primary pipeline availability
• Built a Spring Boot Starter (circuit-breaker) for pipeline load monitoring with REST (Servlet & WebFlux) support and Kafka consumer pause
• Extracted long-running integration calls from Camunda service tasks into dedicated services
• Introduced API-First approach and Checkstyle for code quality
• Code reviews, onboarding new developers, release management

Key Results

✔ Fault-tolerant API reduced application processing failures by ~95% during peak load
✔ Extracted Camunda integration calls cut timeout incidents by ~70%, improving overall system availability
✔ Performance optimization with Micrometer / Prometheus / Grafana reduced average response time by ~30% and memory consumption by ~25%
✔ Checkstyle + TestContainers adoption reduced production bugs by ~40% per quarter
✔ Conducted 150+ code reviews; onboarded 5 developers, cutting average review time from 3 days to 1 day

Java Developer — Fazum LLC

January 2021 — January 2023 · 2 years 1 month

Same domain — banking guarantees. Focused on business process automation and auxiliary service development.

Responsibilities

• Business process automation using Camunda BPM (versions 7 and 8)
• Developed auxiliary services: document retrieval service, installment service
• Participated in code reviews and incident investigations

Key Results

✔ Introduced Java 17 in new projects, moving the team to a modern LTS stack
✔ Adopted TestContainers — increased integration test coverage and improved build stability

Java Developer — BPC Group

July 2018 — December 2020 · 2 years 2 months

International company in payment technologies and processing.

Responsibilities

• Developed a payment gateway (ECOM / P2P)
• Developed ACS (Access Control Server)
• Built a merchant portal

Key Results

✔ Implemented a payment eligibility check mechanism based on transaction time window
✔ Separated migration runs using Liquibase contexts
✔ Enabled per-acquirer service instance launch
✔ Developed integrations for fuel station networks

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Education

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