Web3 Engineer

Key Responsibilities 

● Design, develop, and maintain blockchain and Web3 services supporting the WonnPay 
platform. 
● On and off ramp integration and VIBAN  
● Integrate and maintain blockchain networks such as Ethereum, Polygon, Tron/TRC-20, 
Solana, and other supported networks. 
● Build and maintain crypto deposit and withdrawal flows, including address generation, 
transaction monitoring, confirmations, fee handling, and reconciliation. 
● Work with Fireblocks and other blockchain infrastructure providers for wallet and 
transaction management. 
● Develop secure APIs and backend services for blockchain-related functionality. 
● Implement blockchain transaction monitoring, retry mechanisms, failure handling, and 
reconciliation processes. 
● Work with stablecoins such as USDT and USDC across multiple networks. 
● Support integration of additional digital assets and networks as the product expands. 
● Work closely with Backend, Frontend, Product, QA, Compliance, and Operations teams 
to deliver production-ready Web3 features. 
● Investigate and resolve blockchain transaction issues, including stuck, failed, delayed, or 
incorrectly routed transactions. 
● Monitor blockchain infrastructure and proactively identify reliability, performance, and 
security issues. 
● Implement appropriate security controls around private keys, signing processes, wallet 
operations, and transaction authorization. 
● Participate in architecture discussions, technical design, code reviews, testing, and 
production releases. 
● Prepare technical documentation for blockchain integrations and operational procedures. 
● Support incident investigation and root-cause analysis for blockchain-related production 
issues. 

Required Skills & Experience 

● 5+ years of professional software engineering experience, with strong hands-on 
experience in blockchain/Web3. 
● Strong understanding of blockchain fundamentals, wallets, addresses, transactions, 
gas/fees, confirmations, and network mechanics. 
● Hands-on experience with EVM-compatible networks and blockchain transaction 
processing. 
● Strong experience with TRON/TRC-20 is highly desirable. 
● Experience working with USDT, USDC, and other stablecoins across multiple blockchain 
networks. 
● Hands-on experience integrating crypto on-ramp and off-ramp solutions is required. 
● Experience with virtual bank account / Virtual IBAN setup and integration is required. 
● Experience integrating payment, banking, fiat-to-crypto, and crypto-to-fiat providers. 
● Experience building or integrating deposit, withdrawal, settlement, and reconciliation 
flows. 
● Experience with wallet infrastructure, custody platforms, or blockchain payment 
providers. 
● Experience with Fireblocks or similar institutional wallet/custody infrastructure is highly 
desirable. 
● Strong understanding of transaction signing, wallet security, private-key/MPC concepts, 
and blockchain security. 
● Experience with blockchain APIs, RPC providers, explorers, webhooks, and transaction 
monitoring. 
● Strong backend development experience using Node.js/TypeScript, Python, Go, or 
similar technologies. 
● Experience designing and consuming REST APIs and event-driven services. 
● Experience with databases such as PostgreSQL/MySQL and distributed systems. 
● Strong troubleshooting skills for failed, delayed, stuck, or incorrectly routed blockchain 
transactions. 
● Experience working with fintech, payments, crypto, exchanges, wallets, or regulated 
financial services is strongly preferred. 

Must Have 

● Experience with Fireblocks or similar MPC/custody platforms. 
● Experience with Solana/SPL tokens. 
● Experience integrating crypto payment providers or exchanges. 
● Experience with Chainalysis or other blockchain compliance/monitoring platforms. 
● Experience with blockchain indexing and event processing. 
● Experience with smart contract development using Solidity. 
● Experience with AWS and cloud-native infrastructure. 
● Experience working in fintech, payments, crypto, or regulated financial services. 
● Experience building high-volume transaction processing systems.