Web3 Engineer

Wonnpay FZE; Dubai; On-site; AED 360,000 - 600,000; Full time

Job summary

Wonnpay FZE is seeking a senior blockchain engineer to design, develop, and maintain blockchain and Web3 services for the WonnPay platform. You will work on on/off ramp integration, support wallets, and ensure secure transaction processing across multiple networks.

The role requires hands-on experience with EVM-compatible networks, Solana, USDT/USDC, and integrating crypto on‑ramps with cloud infrastructure. Collaboration with cross‑functional teams is essential.

Qualifications

• 5+ years of professional software engineering experience with hands-on blockchain/Web3.

Responsibilities

• Design, develop, and maintain blockchain and Web3 services for the WonnPay platform.

Skills

Blockchain/Web3

EVM networks

Solana

TRON/TRC-20

Stablecoins (USDT/USDC)

On/Off ramp

Fireblocks

Backend development (Node.js/Typecript

Python

Go

REST APIs

PostgreSQL/MySQL

Security

MPC

AWS / Cloud-native

Web3 APIs / RPC

Testing / CI

Tools

Fireblocks

AWS

Chainalysis

Solana SPL

Job description

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.