jhonzusa

Senior Blockchain Engineer & Stablecoin Architect

Senior Blockchain Engineer with 9+ years of experience building production-level fintech and Web3 systems in Latin America.

At Wenia (Bancolombia Group, the largest bank in Colombia), I designed COPW, a COP-pegged stablecoin on Polygon mainnet: upgradeable ERC-20 (OpenZeppelin proxy pattern), Chainlink Proof of Reserve integrated in the mint function as an on-chain circuit breaker, OZ Defender Sentinels for custody automation, and a COPW/USDC pair with Circle using Alchemy as RPC. Audited and verified by OpenZeppelin.

Production integrations throughout my career: Fireblocks (institutional custody), Circle/USDC, Kraken OTC, AlphaPoint (exchange system), Pomelo (card issuance), Notabene (Travel Rule), Lightning Network, and end-to-end KYC/AML.

I am also comfortable across the full stack: Python/Django, Go, Flutter (4+ published production apps), AWS/Terraform, and LLM integration (LangChain, OpenAI API) in real products.

Open to remote roles in Web3, DeFi, and stablecoin infrastructure. Available immediately.

GitHub: github.com/JhonZuluaga007 | LinkedIn: linkedin.com/in/jhonzusa

Experience: 10 years

Yearly salary: $100,000

Hourly rate: $100

Nationality: 🇨🇴 Colombia

Residency: 🇨🇴 Colombia

Experience

Senior Full Stack Engineer

Auxo

2025 - 2026

Senior Full Stack Engineer building production fintech products. Backend services in Python/Django, frontend in Next.js, and infrastructure on AWS (ECS, RDS, S3) with Docker and CI/CD via GitHub Actions. Integrated LangChain and the OpenAI API directly into product features — RAG pipelines and structured outputs shipped to real users, not isolated experiments. Built Kafka-based event pipelines for async financial workflows. Use AI-assisted development tools (Cursor, Claude) daily as part of the engineering workflow.

Senior Backend Engineer

Mercado Libre

2024 - 2025

Built high-throughput Go data pipelines for one of Argentina's largest investment funds, processing critical financial data at scale with strict SLAs and zero tolerance for data loss. Designed BigQuery and Dataflow streaming jobs for real-time financial analytics and automated regulatory reporting workflows with n8n.

Blockchain & Mobile Lead

B2fintech

2024 - 2025

Led development of a Flutter mobile application integrating blockchain technology, enabling users to buy and sell crypto assets and transact through traditional banks. Built with Clean Architecture and backend microservices for scalability. Structured and implemented the complete KYC (Know Your Customer) process for regulatory compliance. Led the integration with Fireblocks for institutional-grade custody of digital assets, and implemented Pomelo services for Mastercard/Visa card issuance and management.

Blockchain Engineer & Stablecoin Architect

Wenia S.A.S

2022 - 2024

Architected COPW — a COP-pegged stablecoin deployed on Polygon mainnet for Bancolombia Group, Colombia's largest bank. Built upgradeable ERC-20 contracts (OpenZeppelin proxy pattern) with Chainlink Proof of Reserve integrated directly in the mint function as an on-chain circuit breaker against infinite mint attacks. Integrated OZ Defender Sentinels for automated custody, established a COPW/USDC liquidity pair with Circle, and used Alchemy as RPC provider. Contract audited and verified by OpenZeppelin. Also led the Flutter mobile app (Clean Architecture) enabling crypto trading and Bancolombia bank transactions, and implemented end-to-end KYC compliance flows.

Blockchain Engineer — Bitcoin & Lightning Network

Kumuly

2021 - 2022

Built a Flutter mobile app for cryptocurrency management with Lightning Network integration, contributing to broader Bitcoin adoption. Worked with the Bitcoin and Lightning open-source community to grow ecosystem tools and technology. Stack: Flutter/Dart, Lightning Network APIs and nodes, Voltage for liquidity and infrastructure management.

Blockchain Developer (Contract via Michael Page)

Michael Page

2021 - 2022

Developed a Flutter mobile application for crypto asset trading across public networks including Polygon and Bitcoin (Lightning), with Gemini exchange integration for crypto exchange management. Smart contract development with Solidity, Web3.js and Hardhat. Implemented blockchain monitoring using Infura and Moralis nodes.

Microservices Developer

StrationDB

2021 - 2021

Designed and built high-throughput microservices in Java 11 and Maven for a large-scale data processing system. Used Kafka Streams for inter-service messaging and Docker for containerized deployment — architecture organized as independently deployable services ("Lego" pattern) for scalability and maintainability.

Blockchain Workshop Instructor

Blockchain Academy

2021 - 2021

Delivered weekly technical workshops on blockchain ecosystem technologies, including solving Ethereum development challenges and hands-on sessions with Chainlink tooling — contributing to the technical education of the Web3 developer community in Colombia.

Developer Architect

Ceiba Software — Core Suramericana

2019 - 2021

Designed and built a microservices-based integration layer translating data between domain systems, orchestrating information exchange with other Java microservices. Stack: Java 9, Apache Camel, RabbitMQ, Docker, with CI/CD pipelines managed through Jenkins.

Developer Architect

Ceiba Software — Suramericana Insurance Core

2018 - 2021

Maintained and extended Suramericana's Insurance Core platform, developing, testing and integrating new business-requested functionality. Provided support for Core applications managing all company insurance policies. Stack: Guidewire, RabbitMQ, Oracle DB, Agile/Scrum methodology.

Skills

aws

blockchain

blockchain-engineer

bnbchain

devops

flutter

golang

java

mobile

polygon

python

rust

solana

solidity

terraform

web3

english

spanish

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