Halley Ríos Valenzuela 👋

Experienced Full Stack Engineer | Frontend | Backend | Ruby on Rails Specialist | Python Developer | Solidity Developer | Web3 Developer | Blockchain Developer Senior Software Engineer with 15+ years of experience building, scaling, and maintaining production-grade systems, with deep expertise in Ruby on Rails. I specialize in backend-heavy platforms where reliability, performance, and data consistency are critical: • Payment and transaction flows • High-traffic APIs and data-intensive systems • Search and indexing solutions (PostgreSQL, Elasticsearch) • Background processing and async workloads (Sidekiq) I’ve worked extensively on designing, deploying, and operating systems in production, owning services end-to-end—from architecture and implementation to performance tuning and incident resolution. Alongside traditional backend development, I work with Web3 and EVM-based smart contracts, building backend services and contracts that integrate blockchain infrastructure, wallets, and on-chain data into real-world products. I value clean, maintainable code, pragmatic architecture, and long-term system scalability. I’m most effective in environments where engineering quality, ownership, and real-world impact matter. Open to Senior / Lead Backend roles in fintech, marketplaces, and Web3-enabled products.