Vasilii Nikolaev

Project for Ahold Delhaize (US), moving on-prem infrastructure to the cloud. • Migrated 17 high-volume Kotlin and Java microservices (1000 RPS, 11 million daily users) to Azure pipelines and Spring Boot 3, reducing deployment time by 50%, improving release reliability and system security • Led cross-functional team in migrating backend for 3 grocery store chains to PostgreSQL database with FlyWay and applied Hazelcast caching, resulting in a 70% reduction in P99 latency and enabling monolith split

Project for The Home Depot (US), upgrading an interactive voice helper backend. • Provisioned Google Cloud environments using Terraform and Kubernetes, enabling the adoption of a new speech recognition component and accelerating time-to-market for features critical to 1 million daily active users • Optimized planning process for a complex solution on top of Java microservices, Spring and Dialogflow, leading to successful early launch, one month ahead of schedule

Internal project for the call center (Germany), modernizing a legacy system. • Developed scalable services for delegating customer support tasks to company contractors using Java, Quarkus, Kubernetes, FlyWay and Oracle database • Provided mentorship and organized a hackathon for colleagues transitioning from a legacy stack to microservices architecture, resulting in increased team productivity and skill development

Developed a study project, a transportation company application with an interactive map and route optimization, this application: • Managed information on trucks, drivers, cargoes, and depots • Allowed ordering deliveries to clients • Showed an informational panel that received business-related statistics via Server-Sent Events

• Developed an online text editor that facilitated real-time collaboration on documents, similar to Google Docs • Successfully completed a comprehensive training program focused on Java certification (OCA/OCP) • Consistently honed coding skills through rigorous practice on platforms such as HackerRank and CodingBat