QA Engineer

Job Description

We're Hiring: QA Engineer Company: Bingo Singapore Pte. Ltd. Location: On-site Experience: 2+ years in QA (Web3/Blockchain preferred) About the Role: We’re building cutting-edge Node.js applications integrated with blockchain (Ethereum/Smart Contracts/Web3), and we need a meticulous QA Engineer to ensure flawless functionality, security, and performance. You’ll test backend APIs, smart contracts, and decentralized systems while collaborating with Node.js and blockchain developers. Key Responsibilities: ✔ Blockchain-Specific Testing: Test smart contracts (Solidity/Rust) for vulnerabilities (reentrancy, overflow) using tools like Hardhat, Truffle, or Foundry . Validate Web3.js/ethers.js integrations with Node.js backends. Verify wallet connections (MetaMask, WalletConnect) and transaction flows . ✔ Node.js Backend Testing: Test REST/GraphQL APIs (Postman, Supertest) built with Express/NestJS. Automate API tests (using Mocha/Chai, Jest, or Karate ). Monitor WebSocket connections for real-time blockchain events. ✔ Security & Performance: Conduct penetration testing for Node.js APIs (OWASP Top 10). Load-test blockchain interactions (e.g., high TPS scenarios with JMeter). Audit data consistency between on-chain and off-chain (DB) systems. ✔ Tools & Collaboration: Use GitHub Actions/GitLab CI for QA pipelines. Document bugs in JIRA/Linear with reproducible steps. Work with DevOps to test containerized (Docker) deployments. Skills & Requirements: ✅ Must-Have: 2+ years in QA for Node.js/backend systems . Hands-on experience with blockchain testing (Smart Contracts, Web3, RPC nodes). Proficiency in API testing (Postman, Swagger) and SQL/NoSQL validation. Familiarity with CI/CD and version control (Git). ✅ Nice-to-Have: Knowledge of security tools (Slither, MythX) for smart contracts. Experience with performance testing (k6, Locust). Basic scripting in JavaScript/Python . Job Types: Full-time, Permanent Pay: From ₹15,000.00 per month Schedule: Monday to Friday Morning shift Weekend availability Experience: QA/QC: 2 years (Required) Language: English (Preferred) Work Location: In person