Java Developer

Senior Blockchain Developer | De Fi & Web3 Engineer | Remote

Passionate Senior Blockchain Developer with 6+ years of experience delivering high-impact DeFi solutions and Web3 platforms for international companies. Designed and scaled decentralized systems handling millions of transactions and processing terabytes of on-chain data, reducing gas costs by 60% and improving protocol performance by 35%. Strong expertise in Java ecosystem, microservices, and blockchain architecture, complemented by hands-on experience in smart contract development, DeFi protocols, and full-stack Web3 development. Experienced mentor and contributor to architectural decisions in decentralized systems, with a passion for exploring emerging DeFi trends and actively engaging with blockchain developer communities worldwide.

Experience: 6 years

Yearly salary: $100,000

Hourly rate: $0

Nationality: 🌏 Remote

Residency: 🇵🇭 Philippines

Experience

Java Developer & Blockchain Data Engineer

DataChain Analytics — Decentralized data solutions

2021 - 2022

• Built decentralized analytics platform with Java (Spring Boot) + React, serving 2,000+ DeFi protocol users • Designed and optimized 50TB+ transaction data pipelines using Apache Spark and PostgreSQL for multi-chain analytics • Integrated ML models (Python) for yield prediction and risk assessment into DeFi protocol backends • Delivered REST APIs for real-time DeFi metrics visualization and cross-chain liquidity tracking • Achieved 85% test coverage with automated testing frameworks for smart contract interaction services • Collaborated with tokenomics team to implement data-driven reward distribution mechanisms for liquidity providers

DeFi Protocol Developer

CryptoFlow Finance — DeFi protocol development

2020 - 2021

• Built DeFi microservices with Java (Spring Boot) and PostgreSQL for decentralized payment processing • Implemented fraud detection features using rule-based algorithms and on-chain transaction analysis • Improved protocol performance by 35% via smart contract optimization and gas-efficient implementations • Enhanced monitoring with custom dashboards for DeFi protocol metrics and liquidity tracking • Supported migration from traditional banking systems to decentralized finance architecture • Ensured compliance with DeFi security standards and audit requirements

Skills

amazon

aws

backend

blockchain

dao

defi

docker

elasticsearch

ethereum

ethereumjs

gcp

git

golang

grafana

graphql

hadoop

hardhat

java

javascript

kotlin

kubernetes

metaverse

mongo

nft

openzeppelin

polygon

postgres

python

rabbitmq

redis

remix

rust

solidity

sql

truffle

typescript

web3js

english

czech

russian

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