Backend Blockchain Developer (EVM | Tron | Solana | Bitcoin) | Node.js Engineer | Solutions Architect | Smart Contract Auditor
With over 6 years of experience, I specialize in architecting and building scalable, secure blockchain solutions across EVM-based networks, Tron, Solana, and Bitcoin ecosystems. My work spans DeFi protocols, cross-chain bridges, crypto wallets, blockchain indexing, and smart contract audits, all with a strong emphasis on performance, modularity, and security.
- Built smart contracts for staking, swapping, P2P trading, vesting, bridging, NFTs, gaming fund management, and upgradable vault systems
- Integrated advanced features like access control, gasless meta-transactions, EIP-712 typed data signatures, and contract upgradeability
- Worked across EVM chains, Tron, Solana (Rust), and EOS (C++)
- Built high-performance backend APIs using Express.js, NestJS, and integrated with frontend frameworks like Next.js, React, and Angular
- Managed data using MongoDB, PostgreSQL, MySQL, Redis, and real-time messaging with RabbitMQ and Kafka
- Primarily focused on backend architecture with minimal UI involvement
- Developed API services, microservices, and event-driven bots in Node.js, Python, and Rust
- Built services for crypto wallets, DeFi platforms, NFT apps, and cross-chain bridges
- Implemented indexers, watch services, price rebalancing bots, and a P2P trade engine
- Designed large-scale decentralized applications and smart contracts managing high-value funds and high concurrency users
- Delivered secure, gas-efficient, and modular systems tailored to complex business logic
- Audited 25+ smart contracts, identifying and fixing issues like reentrancy, access control flaws, and gas inefficiencies
- Used tools like Slither, Mythril, and manual reviews for in-depth analysis
- Deployed and managed services using AWS (EC2, Beanstalk, Lambda, API Gateway, RDS, DynamoDB, S3, SQS, SNS, etc.)
- CI/CD pipelines with GitHub Actions, Jenkins, PM2, and containerization with Docker
- Monitored logs and metrics using Grafana, built robust deployment workflows for multi-service apps
Ethereum, Polygon, Binance Smart Chain, Tron, Solana, Bitcoin, Dogecoin, Litecoin, Algorand
Hyperledger (Indy, Aries, Firefly)
Solidity, Rust, JavaScript, TypeScript, Python, Go, C#, Java, SQL
Foundry, Hardhat, Viem, Ethers.js, Web3.js, TronWeb, Web3.py
OpenGSN, Moralis, OpenZeppelin Defender
Auditing Tools: Slither, Mythril
Node.js, Express.js, NestJS
MongoDB, PostgreSQL, MySQL, Redis
RabbitMQ, Kafka, REST APIs
React, Angular, Next.js, TypeScript
React Native, Xamarin
AWS, GitHub Actions, Jenkins, Docker, PM2
Grafana for monitoring and analysis
Smart Contract Development & Auditing
Cross-Chain Bridge Architecture
Blockchain Indexing & Data Services
DApp Architecture & Token Standards
Technical Documentation & Team Leadership
-
🧱 EVM-based Blockchain Network
Designed validator logic, staking mechanisms, and consensus protocol for a custom Layer 1 blockchain -
🌉 Cross-chain Bridge (ETH ↔ BSC ↔ Polygon ↔ Tron)
Built decentralized, liquidity-based bridge protocol with validator-based verification -
📊 Bitcoin & Dogecoin Indexers
Built high-performance indexers for UTXO tracking, supporting 150+ concurrent users -
💸 DeFi Projects & Financial Protocols
Developed a wide range of DeFi smart contracts including staking, token swapping, P2P trading, vesting, and liquidity bridging.
Also built secure, upgradable contracts for vaults and for managing game platform funds. Emphasized gas optimization, access control, and modularity. -
🔍 Smart Contract Audits
Conducted 25+ audits with deep analysis and mitigation of critical vulnerabilities
-
M.Sc. Computer Science (Cyber Security)
Cochin University of Science & Technology (CUSAT), Kerala – 2019 -
B.C.A – Bachelor of Computer Applications
Mahatma Gandhi University, Kerala – 2017
- 🌐 Portfolio: devbysaby.github.io
- 📧 Email: [email protected]