Valerii Diadchenko

Summary

Senior Backend Developer with 11+ years of experience in designing scalable enterprise systems. Expertise in Java, Spring, PostgreSQL, Elasticsearch, Docker, Kubernetes, and CI/CD automation. Proven leader in high-load distributed systems, with experience across finance, government, and retail.

Experience

• 
  Lead Developer · T1

  Jun 2023 – Present · Moscow

  • Built CI/CD platform under import substitution strategy.
  • Implemented PostgreSQL integration and cluster mode for scalability.
  • Ensured stability under high load for banking clients.
  • Stack: Jenkins, Java, Spring, PostgreSQL
• 
  Lead Developer · Optimaize GmbH

  Jan 2019 – Jun 2023 · Switzerland

  • Designed Elasticsearch-based search engine for international finance/insurance.
  • Led team of 4 developers, optimizing processes and system performance.
  • Developed human names management system (core company product).
  • Stack: Java 17, Spring, Elasticsearch/OpenSearch, React, Docker, K8s
• 
  Java Developer · RT Labs

  Jan 2017 – Jan 2019 · Moscow

  • Built electronic queue system from scratch.
  • Contributed to E-Government portals (Gosuslugi), incl. regional integrations.
  • Migrated monolith to microservices.
  • Stack: Java 8, Spring, Angular, MongoDB, RabbitMQ, Docker
• 
  Head of IS Support Sector / SQL Developer · Tander JSC (Magnit Retail Chain)

  2014 – 2017 · Krasnodar

  • Managed IT team (8 people), deployed monitoring system.
  • Developed & maintained Auto-Order system with high daily load.
  • Stack: Java 8, SQL Server, Teradata, Oracle, MySQL, Ext JS

Languages

• Russian — Native
• English — Professional Working Proficiency