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Roman Vassilchenko

I build reliable backend systems that make complex business processes faster and easier to operate. Currently working on credit decision infrastructure at Bereke Bank; previously at Ozon.

Go backend engineer · Astana, Kazakhstan · UTC+5

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Roman Vassilchenko

About

I began working professionally with Go in 2023 on Ozon’s hiring platform, then moved to its company-wide employee portal. Today I design credit decision infrastructure at Bereke Bank. Across these roles, my work has stayed at the intersection of distributed systems, business-critical workflows, and production reliability. I care about clear service boundaries, predictable failure handling, and improvements that can be measured in production.

Work experience

Bereke Bank

Middle Golang Developer

Sep 2025 — present

Unified Credit Pipeline / Auto Loan Issuance

Designing the bank’s unified credit pipeline, government and financial data integrations, and high-load microservice orchestration.

  • Took an auto-loan pipeline from pilot to production and reduced issuance time from 40 to 15 minutes.
  • Built Kafka-based communication, latency controls, fallback logic, and operational alerting.

Go · PostgreSQL · Camunda · Kafka · Docker · GraphQL · REST

Ozon

Junior Go Backend Engineer

Aug 2024 — Sep 2025

Employee Portal

Built employee data, compliance, office operations, analytics, and document workflows in a three-person backend team.

  • Co-designed a monolith split into roughly 10 domain services and reduced employee-data lookup time by 25%.
  • Automated attendance workflows for 10,000+ employees; the platform sustained 2,000 concurrent users at rollout.

Go · gRPC · PostgreSQL · ClickHouse · Kafka · Redis · Grafana

Ozon

Go Backend Intern

Dec 2023 — Aug 2024

Hiring Portal

Worked on the core service behind Ozon’s hiring platform and progressed from reporting tasks to on-call production ownership.

  • Reduced candidate-search p95 from 1.5–2 seconds to 500–850 ms through SQL and Elasticsearch improvements.
  • Built reliable delayed candidate notifications with Kafka and monitoring in Grafana.

Go · gRPC · PostgreSQL · Elasticsearch · Kafka · ClickHouse

Selected work

AdalQarau

Public procurement analytics for Kazakhstan: 15M+ contracts, eight rule-based risk indicators, and 448K risk flags across 20 regions.

Auto-loan issuance pipeline

Production credit workflow spanning Camunda orchestration, Kafka events, PostgreSQL persistence, and external data integrations.

Tools

Backend
Go, gRPC, REST, GraphQL, Protobuf
Data
PostgreSQL, ClickHouse, Redis, Elasticsearch, Vertica, MinIO
Systems
Kafka, Camunda, microservices, event-driven architecture
Operations
Docker, Linux, Grafana, Prometheus, Git

Education

B.Sc. Software Engineering

Astana IT University

2023 — 2025

Backend and distributed systems. Previous studies at ITMO University, 2021–2023.

Bachelor thesis

Contact

The fastest way to reach me is Telegram. Email works too.

@Roman_Vassilchenko [email protected]