chreazy

Designed and implemented a custodial platform for managing users' cryptocurrency wallets, including wallet creation, key management, transaction preparation, and processing. Independently developed an HSM module for secure private key storage and usage by implementing isolated cryptographic operations and protecting key material from external access. Integrated the HSM with the backend infrastructure through secure interfaces, enabling secure transaction signing and electronic document signing. Developed NestJS services for digital asset operations, blockchain network integrations, and communication with external systems. Built a centralized audit and logging platform for a distributed infrastructure, integrating more than 15 microservices into a unified event collection system. Implemented event-driven communication between services using RabbitMQ and Redis Streams, configuring more than 20 message queues and event processing streams. Developed 10+ gRPC APIs for internal service communication, improving data exchange efficiency across distributed system components. Designed PostgreSQL schemas for user, transaction, and audit data, optimized queries and indexing, reducing execution time for critical database operations by approximately 30%. Leveraged Redis for caching and temporary data storage, reducing load on core services and improving the performance of frequently executed operations. Wrote over 100 automated tests covering core business logic, service functionality, transaction processing, and integration scenarios. Participated in designing the architecture of distributed services, evaluating technical solutions, and implementing fault-tolerant error-handling mechanisms. Containerized backend services using Docker and contributed to development environment setup and deployment workflows.

Developed blockchain microservices for integrating and managing Real-World Assets (RWA) within the product ecosystem. Built backend services in Rust, Go, and TypeScript for blockchain interaction, transaction processing, and business process automation. Designed and maintained REST APIs, WebSocket services, and internal tools for managing digital assets. Developed and maintained smart contracts for EVM-compatible blockchains using Solidity. Designed, audited, and provided technical guidance on smart contract architecture and integration within the TON ecosystem using Tact and FunC. Participated in designing Web3 product architecture, selecting technical solutions, and integrating blockchain components with backend services. Collaborated with the frontend team, contributing to client-side development using TypeScript and React. Optimized service performance, designed efficient data structures, and improved the reliability of integrations with external systems. Implemented secure wallet management, transaction signing, and blockchain event processing across TON and EVM networks. Designed and optimized PostgreSQL schemas and Redis caching strategies for blockchain-related services, improving throughput and reducing response times. Integrated blockchain nodes and third-party Web3 APIs, implementing retry policies, timeout handling, and fault-tolerant communication. Containerized blockchain services with Docker and participated in deployment and environment configuration for distributed applications. Participated in architecture reviews, code reviews, and technical decision-making for scalable blockchain infrastructure.