Dmitriy Snezhinskiy

I work as an outstaff specialist on an online game project, handling DevOps tasks and gaining solid Kubernetes expertise. - Applied geohashing to optimize map data loading, cutting complexity from O(n²) to O(n) and reducing load time from 19s to 400ms. Built an async real-time messaging service for 4000+ clients. - Set up Prometheus/Grafana monitoring for k8s clusters. - Refactored bottlenecks and fine-tuned Kubernetes deployments, reducing cluster resource use: RAM by 40% (60GB) and CPU by 30% (42 cores).

Project involved migrating a monolithic e-commerce inventory management and product storage system from PHP to Java. My role was to assist in building the foundation for the future system while collaborating with the existing team. - Migrated from legacy PHP code to Java, specifically using Spring Boot. - Completely redesigned the REST API to smoothly integrate with the new Vue.js-based frontend. - Splitting a single MySQL database into several PostgreSQL/MongoDB databases

SAAS project on a national scale, targeting small retail businesses. Developed a loyalty platform enabling clients to run promotions, discounts, and other marketing campaigns. - Completed a full migration of a legacy project from outdated Spring 4 to Spring Boot 2.5. - Implemented SSO using Spring Authorization Server with Opaque tokens (as part of the preparation for microservices decomposition). - Developed an extensible system for report generation/import/export data CSV, XLS, XLSX (total 15+)

A B2B project aimed at simplifying SMS purchases for businesses. - Built a logging and report storage system that allowed the support team to stop manually extracting data from the database for clients. - Developed an XLS document generation service to streamline accounting tasks. - Integrated a payment system to enable payments from small businesses.

- Developed a significant part of the SMS broadcast management platform. - Expanded the functionality of services for SMS/USSD/WAP platforms. Integrated with APIs of various mobile operators (more than 700k + SMS per day). - Developed and maintained the logic of SMS broadcast systems through operator SMS gateways.

- Together with other team members, we completely rewrote the core of the payment system in less than 1 year - Integrated with APIs of banks, including acquiring banks, using binary protocols (3 banks). - Ensured code compliance with PCI DSS requirements, leading to a successful audit.

- Build an internal CMS in PHP, using PostgreSQL as the database.