Lesther Gabriel Caballero Pacheco

Rust, Go, Typescript

• Developed Solana Rust smart contracts using Anchor in order to allow customers to register devices, create plans and pay for subscriptions
• Developed replicable local environment for smart contract interaction using Typescript
• Worked on Go backend in order to expose API to customers, stream data from different services using NATS, listen to Smart contract events and update customer data
• Migrated Rust backend to Go keeping the same API
• Created a private Go library in order to share and avoid code duplication across services

NodeJS, React, NextJS, Rust, Go, Postgres, Solidity, Tact

• Opsin: Created trade feature in the NodeJS/NestJS backend though agregators by exposing a websocket and API endpoints. Worked on blockchain raw data indexing in order to expose blockchain analytics such as candle ticks, transactions, balances, etc. Implemented MEV protection option for users' trades. Developed a Rust-based Solana smart contract for swap integration.
• PyTON: Solidity/Tact smart contracts and Go-based ZkEVM node to sync Polygon L2 with TON L1.
• 7k AI: React UI for AI trading chatbot integrated with Cetus DEX on SUI.
• Tars Staking: Engineered Solana staking and DAO smart contracts in Rust in order to enable users to stake and withdraw rewards, created a private npm library with TypeScript to abstract the complexity of the smart contract interaction. Implemented the frontend using TypeScript with Vite + React for the user interface, alongside Next.js for the admin dashboard. Built Solana indexer using The Graph and Postgres in order to perform complex off-chain calculations.
• One Balance: Developed ERC-4337 Account Abstraction smart contracts using Solidity, including role-based validation. Created API endpoints in order to create a wallet, predict an address, swap across chains, etc. Integrated endpoints in React application.
• Runemine: High-performance Bitcoin Runes indexer (Rust/SQLite), NextJS block explorer.
• Zenrock: Built a cross-chain bridge for SPL tokens using Solidity and Rust. Integrating Cosmos modules via Go to link Bitcoin, Zenrock, and Solana. Unit tests integration using Go and Typescript.
• Swisstronik: Enhanced blockchain interoperability by contributing to the Swisstronik SDK and developing TypeScript libraries for web3.js and viem compatibility, with example integrations and compliance demos using Solidity and React.

NodeJS, React, Angular, Rust

• DeWallet: Chrome extension wallet for ERC-721 management (NodeJS, Solidity).
• LiveCGI: ERC-1155 marketplace on Skale, cross-chain bridge to Ethereum Mainnet.
• Rainmaker: Multi-chain staking and vesting (Solidity, Angular) on Ethereum and Polygon.
• Bridge Tower: NFT marketplaces and staking on Avalanche/Ethereum, audits, authenticity certificates.
• NEOM: ERC-721 marketplace (React, Solidity).
• Bridge Mutual: Decentralized staking with bridging (Angular, Solidity).
• SatoshiSync: Cross-chain bridge for Bitcoin Ordinals/BRC-20 to EVM and Solana (Rust, NestJS).

NodeJS, Rust, React, AWS

• Solana Pay retail payment platform (QR, SPL swaps) with React, NodeJS, AWS (EC2/Lambda).
• Automated arbitrage bot for AMM bidding and management UI (Rust, React, AWS).

NestJS, NodeJS, GraphQL

• Led APIs for multiple cryptocurrencies; GraphQL schemas and resolvers for crypto data.
• Integrated APIs into Paribu ecosystem; emphasis on quality, documentation, maintainability.

NodeJS, Ionic (Angular), Firebase, BigQuery, Algolia, GCP

• Architected solutions and led dev team; Ionic (Angular) web and mobile apps.
• Backend with NodeJS and Firebase; BigQuery for analytics, Algolia for search; GCP infrastructure.

NodeJS, React, MongoDB, Solidity, Web3, GCP

• Smart contract system with Diamond Algorithm for upgradability; React front end for issuers and investors.
• NodeJS backend, MongoDB, GCP; security, testing, and auditing of contracts and application code.

NodeJS, Angular, SQL Server, GCP, Linux

• Property listings and rentals platform with cryptocurrency transactions; NodeJS backend, Angular UI, SQL Server.

NodeJS, Angular, Firebase, MySQL

• Backend and Angular front end for high-frequency trading data; Firebase, MySQL.