MJMarko Jauregui

Open to workBuenos Aires

Marko
Jauregui

Full-stack engineer.

Web applications, real-time systems
and smart contracts.

Explore my work Download résumé

Selected work

Engineering contributions, project by project.

Cooking.gg

Full-stack trading platform · Rather Labs

My contributions

Portfolio & wallet stateLive positions, PnL views and wallet selection.

Built wallet-filtered trading views and fixed a wallet-selection bug caused by state drift across chains and page reloads. Extracted shared matching logic and added unit tests.

Backend servicesNestJS refactor and Solana data pipeline.

Contributed to modularizing backend services in NestJS. Worked on a WebSocket pipeline for Solana block data, including filtering and compressed persistence in PostgreSQL.

Authentication & referralsSocial login, sessions and referral flows.

Implemented Google, Apple and X login through Auth0, with PKCE and backend code exchange. Built referral-code validation APIs and the matching Next.js UI.

Next.js / NestJS / TypeScript / PostgreSQL / TypeORM

Soul Labs

Cross-chain lending

My contributions

Developed core Solidity contracts for multi-chain collateral and debt positions.

Solidity / Chainlink CCIP

Libertum

Real-estate tokenization

My contributions

Collaborated on smart-contract infrastructure for utility tokens, a launchpad and real-estate tokenization.

Solidity / ERC-20

Skills

Full-stack engineering, with agents in the workflow.

Frontend

Interfaces, application state and data-driven views.

  • TypeScript
  • React
  • Next.js
  • Jotai
  • TanStack Query

Backend & data

APIs, authentication and relational data.

  • Node.js
  • NestJS
  • Express
  • PostgreSQL
  • TypeORM
  • Prisma
  • Auth0

Agent-assisted development

Daily coding-agent workflows, backed by Claude API and agent-skills training.

  • Claude Code
  • MCP
  • Agent skills

Now exploring agent applications.

Claude Certified Architect – Foundations

Issued Jun 2026 · Expires Dec 2026

Blockchain experience

  • Solidity
  • EVM
  • Foundry
  • Hardhat
  • ethers.js
  • Chainlink CCIP

Experience

Roles, teams and progression.

Rather Labs

Dec 2024 – May 2026 · Remote

Joined as an intern and progressed through two engineering roles, contributing across technical planning, API development and frontend implementation.

  1. Full Stack Engineer

    Nov 2025 – May 2026

  2. Software Developer

    Jul 2025 – Nov 2025

  3. Software Developer Intern

    Dec 2024 – Jul 2025

Apr 2023 – Oct 2023

N2

Software Engineer Intern

Contributed to a database platform helping startups find venture-capital investors.

Dec 2022 – Apr 2023

Libertum Project

Blockchain Developer · Part-time

Collaborated with more experienced developers in an early blockchain engineering role.

Feb 2021 – Jan 2023

Freelance

Blockchain Developer

Took on independent blockchain projects, from token and minting contracts to more complex DeFi applications.

Jun 2022 – Nov 2022

BetterBets

Frontend Developer Intern

Helped build a crypto gaming platform frontend with Vue 3 and GraphQL, collaborating within a shared team codebase.

Experience & credentials on LinkedIn