🟢 Open to new opportunities — Java / Spring Boot backend roles.
📧 manyakinsasha@gmail.com · ✈️ Telegram

name:        Alexander Manyakin
handle:      Rav316
role:        Java Backend Developer
location:    Saint Petersburg, Russia
experience:  3+ years with Spring Framework
languages:   Russian (native) · English (B1)
status:      open to new backend opportunities 🟢
philosophy:  finds non-standard ways to optimize apps

I build production backend systems end-to-end — from schema design and migrations to event-driven microservices, observability and CI/CD. At Crystal Sound I shipped B2B/B2C products (GPS audio-tour platform, multi-tenant ERP, event management) on Spring Boot + Kafka + PostgreSQL.

Beyond Java I write React / React Native for full-stack pet projects, and explore Go for lightweight services.

B2B/B2C product line: GPS audio-tour platform, ERP for equipment rental & logistics, event management platform.

• 🚀 Designed and shipped a microservices platform with event-driven communication via Apache Kafka
• 🏢 Built a multi-tenant ERP with full order lifecycle, 4-level role system and audit trail — automated key dealer-network business processes
• 📍 Implemented real-time GPS tracking over WebSocket — the flagship feature for B2B clients
• 📊 Set up the observability stack (Prometheus, Grafana, Loki) and a GitLab CI pipeline — cut delivery cycle and incident triage time
• 🐘 Designed PostgreSQL schemas with 100+ Liquibase migrations, caching, geospatial queries and performance tuning

• Architecture and business logic for client apps
• PostgreSQL design, query optimization, Liquibase migrations
• REST APIs, integrations with payment systems and email auth
• High coverage with JUnit5 + Testcontainers
• Dynamic search filters via QueryDSL