Alexander – Solidity, web3.js, Ethers.js

A high-performance, EVM-compatible Layer 1 built on Hyperledger Besu, designed for sub-second transaction finality and decentralized AI infrastructure, using ANKR tokens as native gas. Delivered a high-speed canonical bridge enabling secure, low-latency asset transfers from Ethereum.

• Architected the cross-chain bridge using ERC1967 upgradeable proxies and dedicated Vault contracts;
• Designed the interoperability layer, using self-hosted Subgraphs and a Hyperledger Besu plugin to coordinate off-chain communication between Ethereum and Neura;
• Implemented core security logic, including ECDSA verification, Chain ID checks, and nonce-based replay protection;
• Designed a validator-backed execution model using Safe multisig with a 10-of-12 threshold for secure token releases;
• Achieved 100% test coverage with Foundry, utilizing unit, integration, and fuzz tests to ensure protocol reliability;
• Led internal security audits and integrated Slither/AlamanxAI static analysis into the development pipeline.

A platform that lets developers deploy and run Solidity smart contracts on Hedera using an Ethereum-compatible EVM (via Hyperledger Besu), combining familiar Web3 tools with Hedera’s fast, low-latency Hashgraph consensus.

• Authored HIP-729, a Hedera Improvement Proposal to externalize smart contract nonces, enabling correct eth_getTransactionCount behavior;
• Validated EVM correctness by writing complex Solidity test suites to verify revert semantics, CREATE2 deterministic deployments, and state consistency;
• Collaborated with major ecosystem partners like SaucerSwap and Kabilla Wallet to debug failed transactions and adapt SDK behaviors to real-world DeFi requirements;
• Managed the HackerOne bug bounty pipeline, reproducing Proof-of-Concepts (PoCs) for reported vulnerabilities and coordinating fixes with the core node team.

A gamification platform for attracting new users to the Neura blockchain network. Built to handle massive scale, the platform successfully onboarded over 1 million users in its first month.

• Developed the core backend using Node.js and TypeScript, ensuring high availability for global users;
• Architected a responsive frontend with React, integrating wallet connections and real-time quest tracking;
• Implemented advanced security measures, including IP blacklisting and rate-limiting middleware to prevent bot abuse;
• Configured AWS WAF rules to protect against DDoS attacks and common web vulnerabilities;
• Managed cloud deployments using AWS EC2 and S3, optimizing storage costs and delivery speeds for platform media;
• Built serverless Faucet logic using AWS Lambda to handle secure, on-demand token distributions.

Competitive auditing of high-profile DeFi protocols to identify critical vulnerabilities in smart contract logic

• Identified 5 High and 7 Medium risk vulnerabilities in public contests, providing comprehensive Foundry-based PoCs for each finding;
• Deepened understanding of advanced attack vectors, including Flash Loan exploits, Oracle manipulation, and reentrancy;
• Solved 95% of Ethernaut CTF levels, documenting detailed writeups on EVM opcodes and Yul/Assembly level exploits.

E-Commerce shop for second hand luxury brands

• Developed the Android ecosystem using MVP architecture and integrated RESTful APIs for product management;
• Engineered the warehouse ERP logic, enabling workers to scan, weigh, and track inventory seamlessly;
• Optimized mobile performance, achieving and maintaining 99.78% crash-free users through rigorous testing and debugging;
• Managed full-stack integration between the warehouse logistics backend (Spring) and the user-facing mobile experience.