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Ronald Sarmiento

Ronald Sarmiento

Senior Full Stack Engineer — Blockchain & Web3

Bogotá, Colombia — Remote (UTC−5)

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01Summary

Senior Full Stack Engineer with 8+ years of experience building software end to end — from requirements and architecture to development, testing and production. Spent almost six years building cross-chain infrastructure between Bitcoin and Rootstock (EVM): native bridges, swap aggregation and trust-minimized protocols. Experienced in layered and event-driven architectures, Bitcoin standards (PSBT, BIP-32/44), hardware and MPC custody wallets, and secure development practices (OpenSSF, SonarCloud, coordinated vulnerability disclosure). Works with TypeScript, Vue, React/Next.js and Node.js, and uses AI-assisted development daily.

02Experience

  1. Sep 2022 – Sep 2026 | Remote

    Senior Full Stack DeveloperRootstock Labs (formerly IOV Labs)

    Cross-chain infrastructure between Bitcoin and Rootstock (EVM-compatible sidechain): a native two-way bridge, a multi-provider swap aggregator and a trust-minimized bridge built on BitVMX. Owned research and platform architecture tasks in a 6-person Scrum squad.

    • Designed and built layered REST APIs in Node.js (LoopBack, NestJS) and event-driven services with message queues (AWS SQS).
    • Built block-processing pipelines that index Bitcoin (Blockbook) and Rootstock to track cross-chain transaction state in MongoDB.
    • Built modular frontends (Vue 3, React/Next.js) with adapter-based wallet services, so new wallets and providers plug in without changing core flows; contributed to reusable TypeScript SDKs for transaction building, swaps and wallet providers.
    • Implemented Bitcoin transaction flows with PSBT (BIP-174), UTXO selection, fee estimation and HD key derivation (BIP-32/44).
    • Integrated hardware wallets (Ledger, Trezor), WalletConnect/Reown and MPC institutional custody (Fireblocks, Fordefi); EVM integration through the EIP-1193 standard and ethers.js, including Rootstock's precompiled bridge contract.
    • Implemented fast transfers through liquidity providers and HTLC atomic swaps, including fund recovery flows.
    • Remediated reported vulnerabilities through coordinated disclosure (GitHub Security Advisories) and maintained CI pipelines under OpenSSF Scorecard and Best Practices, SonarCloud quality gates and CodeQL code scanning.
    • Promoted code review and automated testing (Jest, Vitest, Mocha), onboarded and mentored new team members, and worked daily with AI-assisted development (Claude Code, custom skills, lightweight agents).

  2. Feb 2020 – Jul 2022 | Bogotá, Colombia

    Development EngineerTRU Group

    • Assigned to IOV Labs (Rootstock) as a core developer of its native Bitcoin ↔ Rootstock bridge web app, from the first commit (Dec 2020) to the mainnet launch (Jan 2022): Bitcoin peg-in transactions signed with Ledger, Trezor and Liquality wallets, and real-time confirmation tracking.
    • Developed blockchain products for decentralized finance (a DeFi protocol on Rootstock), proof of humanity and document verification.

  3. Aug 2019 – Nov 2019 | Bogotá, Colombia

    Junior DeveloperViveLab Bogotá

    • Developed, through Universidad Nacional de Colombia, a blockchain pilot to track every step of the procurement process of the Colombian public-school meal program (PAE), supporting the preventive work of the Attorney General's Office (Procuraduría General de la Nación).

  4. Nov 2017 – Aug 2019 | Bogotá, Colombia

    Computer AnalystIndudata

    • Specified requirements for enterprise software projects.
    • Built data models and architectural representations in Enterprise Architect, maintaining architecture documentation and traceability between models.

03Skills

Languages
TypeScriptJavaScriptPythonSolidity
Frontend
Vue 3VuetifyReactNext.js
Backend
Node.jsNestJSLoopBackExpressREST APIsPrisma
Architecture
Layered and event-driven architecturesmessage queuesblock-processing pipelinesadapter-based modular frontendsSDK design
Data & Infra
MongoDBPostgreSQLDockerAWS (SQS, Secrets Manager)GitHub ActionsSentryPrometheus
Bitcoin & Web3
PSBT (BIP-174)HD wallets (BIP-32/44)UTXObitcoinjs-libBlockbookHTLC atomic swapsBitVMXEVM (EIP-1193, ethers.js, web3.js, Hardhat)LedgerTrezorMPC custody (Fireblocks, Fordefi)WalletConnect/Reown
Security & Quality
OpenSSF Scorecard and Best PracticesSonarCloudCodeQLcoordinated vulnerability disclosureJestVitestMocha/ChaiCypressPlaywright
AI tooling
Claude Codecustom skillsagent orchestration
Practices
Software architecturetechnical researchrequirements engineeringcode reviewScrum

04Education

  1. 2021

    B.S. Systems and Computing EngineeringUniversidad Nacional de Colombia

  2. 2019

    Smart Contracts on Blockchain (Practical Course)Universidad Nacional de Colombia

05Languages

  • Spanish: Native
  • English: Professional working proficiency (B2+)