Java backend developer. I build payment integrations, API clients and modular platforms for gaming communities — from SDK design to production deploys.

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• Payment integrations — YooKassa, Cryptomus: bills, webhooks, refunds, idempotency
• API clients — type-safe sync/async wrappers, WebSocket events, rate-limit handling
• Modular backend platforms — plugin architecture with isolated optional dependencies, per-module databases and schema migrations
• Discord & Minecraft ecosystems — bots, economy, inventories, shops, giveaways

Bunny — modular Discord platform, 25+ independently deployable modules (economy, items, shops, donations, giveaways, tickets, forms, verification).

• Java 25, JDA 6, Components V2 UI
• Ebean ORM over HikariCP: PostgreSQL, MySQL and SQLite from one config switch
• Caffeine caching with write-behind persistence
• Payment flow with discounts, promo codes and free-purchase handling
• Module system with runtime-optional dependencies that never break class loading

Java SDK for YooKassa payments.

Java REST API Payments

Type-safe Java client for LIS-SKINS API.

• sync / async API
• WebSocket events
• automatic rate-limit retries
• Java 17+
• JitPack

Java API Client WebSocket

Java SDK for Cryptomus payment integration.

Java REST API Crypto Payments