rolnimar

Worked across multiple greenfield projects with strong focus on Web3 and blockchain integration. Technologies: Spring Boot (Java 17–25), Kotlin, Hibernate, jOOQ, Hexagonal Architecture, CQRS, Solidity, Anchor (Rust), TypeScript. Key Projects: OnRe – Solana DeFi Protocol (Apr 2025 – Present) – Core developer of Anchor-based Solana programs written in Rust. Contributed to protocol logic, instruction design, account validation, and backend integration with Java/Kotlin/Typescript services. Repository: https://github.com/onre-finance/onre-sol Billionair – Kotlin-based Web3 online casino platform. Fatty Token Presale – Java backend & Solidity smart contracts for token sale. Runwago and Runwago Presale – Java backend for mobile app, including smart contract support in Solidity. One Championship Arena – Full Web3 integration on Sui blockchain with a TypeScript backend. Telegram Clicker Apps – Multiple mobile-integrated apps using Java and Telegram APIs. Deep experience with Decentralized Finance (DeFi), EVM-compatible chains, Solana, and Sui. Contributed to backend architecture, smart contract development, and cross-chain dApp ecosystems. Additional Responsibility: Participated in candidate interviews, helping evaluate technical skills and team fit.

Developed microservices for an energy sector application for ČEZ using Spring Boot, Java 11, Kotlin, and Apache Kafka. Participated in architecture decisions and implementation of scalable backend services.

Developed and maintained applications using Java EE and Spring Framework. Worked on transition of internal systems from Java 8 to Java 11. Utilized Hibernate ORM for database interactions and performance tuning.