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in the Dominican Republic

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Lobsang Gabriel M.

Santo Domingo Este, Dominican Republic

$23/hr
5.0
2 jobs

I architect and build production-grade Web3 platforms, decentralized applications (dApps), and hybrid on-chain/off-chain systems. With deep expertise in Node.js backend engineering and smart contract integration, I help startups and enterprises launch secure, scalable blockchain solutions. Core Web3 & Blockchain Expertise: Smart contract integration (Ethereum, BSC, Polygon) using ethers.js and web3.js Wallet connection, transaction signing, and gas management On-chain event listening & off-chain data synchronization Token payments (ERC-20, ERC-721, native coins) and automated routing Building custom indexers and real-time blockchain listeners DeFi primitives: swaps, staking, liquidity pools (integration layer) Node.js Backend (Senior Level): NestJS, Express, Fastify – REST and GraphQL APIs Microservices architecture with event-driven patterns (RabbitMQ, Redis) TypeScript – strictly typed, maintainable codebases PostgreSQL, MongoDB, Redis for hybrid persistence Bull/Agenda for job queues and background workers Also Experienced In (Legacy / Enterprise): Custom admin dashboards (React, Vue + Quasar) Inventory, rental management, payment integrations Role-based access control (RBAC) systems Business process automation (n8n, Node.js scripts) Cloud deployment: Google Cloud, Azure, Docker Why work with me? I combine Web3 innovation with battle-tested backend engineering. Unlike pure blockchain developers, I understand how to build reliable off-chain systems that interact safely with smart contracts. I handle double-spending risks, transaction retries, and state reconciliation between blockchains and databases. I deliver clean, documented, and tested code. Let's turn your Web3 idea into a working product.

  • Google Cloud Platform
  • Linux
  • PostgreSQL
  • NestJS
  • Golang
  • Docker
  • API Development
  • Vertex AI
  • Engineering Design
  • System Automation
  • Quasar Framework
  • OpenAPI
  • AI Development
  • DevOps
  • n8n
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