Multi-Chain Wallet Monitoring Dashboard

We are seeking an experienced blockchain and backend developer to enhance our existing production wallet monitoring dashboard. Currently, the dashboard tracks Ethereum wallets, including balances and transactions. The primary goal of this project is to extend the system's capabilities to support multiple blockchain networks, specifically Bitcoin, tron, and bnb chain, with the potential for integrating other chains like polygon and solana in the future. The aim is to create a unified dashboard that can reliably monitor various wallet types across different chains, providing real-time or near real-time updates. The successful candidate will be responsible for analyzing the current Ethereum wallet monitoring logic, designing a robust multi-chain abstraction layer, and implementing comprehensive wallet monitoring functionalities for balance changes and incoming/outgoing transactions across the new chains. This will involve integrating with reliable RPCs and APIs specific to each blockchain and normalizing the collected data into a common format suitable for the existing dashboard. Scalability is a critical requirement, as the system must efficiently handle a large number of wallets with frequent polling or streaming updates. Technical expertise in blockchain RPCs and APIs, along with a deep understanding of UTXO versus account-based chains, rate limits, batching, and the differences between webhooks and polling mechanisms, is essential. Candidates should have practical experience with at least two non-Ethereum blockchain networks. Prior experience with wallet trackers, blockchain explorers, or analytics tools, as well as familiarity with services like Blockchair, BlockCypher, TronGrid, Alchemy, or QuickNode, and knowledge of indexing or event-driven architectures, would be highly beneficial. Deliverables for this project include the complete multi-chain wallet monitoring logic, a chain-agnostic data model, a detailed integration guide with setup instructions, and comprehensive test cases or sample monitored wallets.