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Roman Vassilchenko

I build backend systems that make complex business processes faster and safer to run — from credit pipelines at Bereke Bank to company-wide platforms at Ozon. Currently a Go developer at 7Generation.

Go backend engineer · Astana, Kazakhstan · UTC+5

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Roman Vassilchenko

About

I have been writing Go professionally since 2023. At Ozon I started on the hiring platform and moved on to the company-wide employee portal. At Bereke Bank I took an online auto-loan product from pilot to production and then designed the bank’s unified credit pipeline.

The common thread is distributed systems around business-critical workflows: clear service boundaries, predictable failure handling, and improvements that can be measured in production.

In parallel I am doing a master’s at Astana IT University, researching anomaly detection in public procurement data — the same problem behind my side project, AdalQarau.

Experience

7Generation

  1. Golang Developer

    Oct 2026 — present

Bereke Bank

Sep 2025 — Oct 2026

  1. Middle Golang Developer · CoreHub · Unified credit pipeline

    Feb 2026 — Oct 2026

    Designed the bank’s unified credit pipeline that standardizes loan issuance across products.

    • Centralized application routing, validation, and decision flows across loan products.
    • Built production integrations with government and financial services: credit bureau, collateral registries, identity verification.
    • Designed fault-tolerant services with strict latency SLAs, Kafka-based communication, and fallback logic.

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

  2. Middle Golang Developer · Auto loans (B2C)

    Sep 2025 — Feb 2026

    Online auto-loan process built on Credit Factory and a web application integrated with FICO.

    • Took the pipeline from pilot to production and cut issuance time from 40 to 15 minutes through parallel processing.
    • Supported growth to 130 applications per day within six months; built production alerting into the corporate messenger.

    Go · PostgreSQL · Kafka · Credit Factory · FICO · REST

Ozon Tech

Dec 2023 — Sep 2025

  1. Junior Go Backend Engineer · Staff portal · employee platform

    Aug 2024 — Sep 2025

    Three-person backend team behind the company-wide employee platform, with on-call ownership.

    • Co-designed the split of a monolith into roughly 10 domain services; built the employee-data service and cut average lookup time by 25%.
    • Automated attendance and seat reclamation for 10,000+ employees; the platform sustained 2,000 concurrent users at rollout.
    • Sole backend owner of compliance questionnaires; built a trademark-approval backend with a Go document generator.

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

  2. Go Backend Intern · Matrix team · hiring platform

    Dec 2023 — Aug 2024

    Core service of the company-wide hiring platform; grew from reporting tasks to on-call production ownership.

    • Reduced candidate-search p95 from 1.5–2 s to 500–850 ms by fixing SQL indexes and rewriting Elasticsearch queries.
    • Built a candidate-update notification bot with reliable delayed delivery through Kafka.

    Go · gRPC · PostgreSQL · Elasticsearch · Kafka · ClickHouse

Side project

AdalQarau

Creator · 2024 — present

Public procurement analytics platform for Kazakhstan.

  • Rule-based corruption-risk detection across 15M+ contracts, 197K buyers, and 800K suppliers — eight indicators, no labeled training data.
  • 448K risk flags across all 20 regions; thresholds calibrated with government auditors and used in real audits.

Go · ConnectRPC · PostgreSQL · React · TypeScript · MinIO · Docker

Skills

Backend
Go, gRPC, REST, GraphQL, Protocol Buffers
Data
PostgreSQL, Redis, ClickHouse, Vertica, Elasticsearch, MinIO/S3
Distributed
Kafka, Camunda BPMN, microservices, event-driven systems
Operations
Docker, Kubernetes, Grafana, Prometheus, GitHub Actions, Linux

Education

M.Sc. Computer Science & Engineering

Sep 2025 — Jun 2027

Astana IT University

Research: intelligent methods for anomaly detection in tender procurement data.

B.Sc. Software Engineering

Sep 2023 — Jun 2025

Astana IT University

Thesis on AdalQarau: anomaly detection in public procurement.

Read the thesis

Computer Science

2021 — 2023

ITMO University, St. Petersburg

Two years completed before transferring to Astana IT University.

Contact

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

@Roman_Vassilchenko [email protected]