Lesther Caballero

Blockchain Developer & Software Architect

Lesther Gabriel Caballero Pacheco

Over 9 years building decentralized applications and robust backend infrastructure. Multi-chain development with Solidity, Rust, Go, and TypeScript across Ethereum, Solana, TON, Cosmos, and Bitcoin.

Madrid, Spainlesther.tech@gmail.comLinkedIn

Experience

Roles and responsibilities across blockchain and full-stack teams.

DAWN

Blockchain Developer

March 2025 – Present

Rust, Go, Typescript

  • Developed Solana Rust smart contracts using Anchor in order to allow internet plan subscriptions.
  • Worked on Go backend in order to expose API to customers, listen to Smart contract events and update customer data
  • Migrated Rust backend to Go keeping the same API

Rather Labs

Full Stack Developer

May 2023 – March 2025

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

  • PyTON: Solidity/Tact smart contracts and Go-based ZkEVM node to sync Polygon L2 with TON L1.
  • Opsin: Multi-chain vaults and swap logic (Rust/NestJS), Turnkey integration, Clickhouse data ingestion.
  • 7k AI: React UI for AI trading chatbot integrated with Cetus DEX on SUI.
  • Tars Staking: Solana staking and DAO contracts in Rust, The Graph, Vite/NextJS dashboards.
  • One Balance: ERC-4337 account abstraction, Turnkey (Rust/NestJS) for trading.
  • Runemine: High-performance Bitcoin Runes indexer (Rust/SQLite), NextJS block explorer.
  • Zenrock: Cross-chain SPL bridge (Solidity/Rust), Cosmos/Go linking Bitcoin, Zenrock, Solana.
  • Swisstronik: TypeScript/JS libs for EVM–Cosmos cross-chain interactions.

Ideasoft

Blockchain Developer

December 2021 – May 2023

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).

CoinFx

Full Stack JavaScript & Rust Developer

January 2022 – July 2022

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).

Paribu

Backend Developer

May 2021 – December 2021

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.

Linea D

Architect, Team Lead & Full Stack Developer

August 2019 – May 2021

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.

Crypto Asset Rating

Architect, Team Lead & Full Stack Developer

June 2018 – August 2019

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.

RentPeacefully

Freelance – Lead Developer

December 2017 – June 2018

NodeJS, Angular, SQL Server, GCP, Linux

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

Cryptoway

Freelance – Full Stack Developer

January 2017 – December 2017

NodeJS, Angular, Firebase, MySQL

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

Featured Projects

Selected work from recent roles.

Opsin

Multi-chain user vaults and swap logic; Turnkey integration for EVM and Solana. Raw blockchain data ingestion using Clickhouse and Microservices

Rust, NestJS, Solana, Clickhouse

PyTON

Polygon-based L2 synchronized with TON L1 via Solidity/Tact contracts and Go ZkEVM node.

Solidity, Tact, Go, ZkEVM

Runemine

High-performance Bitcoin indexer for Runes and dedicated NextJS block explorer.

Rust, SQLite, NextJS

SatoshiSync

Cross-chain bridge for Bitcoin Ordinals and BRC-20 to EVM and Solana.

Rust, NestJS

One Balance

ERC-4337 account abstraction and Turnkey-based seamless trading.

Solidity, Rust, NestJS

Tars Staking

Solana staking and DAO smart contracts with The Graph and Vite/NextJS dashboards.

Rust, Solana, The Graph, NextJS

Skills

Technical focus and leadership experience.

Blockchain & Smart Contracts

  • Solidity
  • Rust
  • Tact
  • L2 (Polygon ZkEVM)
  • Staking / DAO
  • Cross-chain bridges
  • ERC-4337 Account Abstraction
  • Diamond Algorithm

Full-Stack

  • NodeJS
  • NestJS
  • React
  • NextJS
  • Angular
  • GraphQL
  • TypeScript

Infrastructure & DevOps

  • AWS (EC2, Lambda)
  • Google Cloud
  • Docker
  • Firebase
  • BigQuery

Leadership

  • Architecture
  • Team Lead
  • Cross-functional delivery
  • Security & audits

Get in touch

Open to architecture, leadership, and hands-on blockchain and full-stack roles.

Email meLinkedIn

Electronics Engineering · Simón Bolívar University, Caracas