Largeton Group is hiring a

Blockchain QA Engineer

Summary

Job Summary (List Format) Blockchain QA Engineer

• Ensure correctness, security, and reliability of a verifiable financial data platform anchored to blockchain.
• Validate data-heavy pipelines and ensure ISO 20022 semantic consistency.
• Test blockchain attestation logic, including cryptographic proofs and smart contracts.
• Validate end-to-end chain of custody for financial records: canonicalization, cryptographic integrity, blockchain attestations, selective disclosure, and reconciliation.
• Design, implement, and maintain automated test suites for backend APIs (Golang), smart contracts (Solidity/EVM), and data pipelines (ETL/normalization).
• Conduct rigorous manual testing for complex financial transaction edge cases.
• Perform functional and security testing of smart contracts; validate on-chain state transitions and event emissions.
• Test scenarios involving chain reorganizations, gas spikes, network latency, and failed attestations using tools like Hardhat, Foundry, or Truffle.
• Validate ISO 20022 semantic mapping and perform differential testing to ensure data fidelity.
• Test Merkle tree construction and proof inclusion logic.
• Conduct load and fuzz testing on data ingestion, proof-generation services, smart contracts, and API endpoints.
• Collaborate with Cybersecurity to validate identity and provenance layers.
• Integrate blockchain testing into CI/CD pipelines (ArgoCD/GitHub Actions).
• Develop custom scripts (Python, Go, JS) for test data and event stream simulation.
• Track and document bugs, providing clear reproduction steps.
• Requires 4+ years of QA/SDET experience, 2+ years in blockchain/Web3 QA, and proficiency in at least one programming language (Golang, Python, JS/TS).
• Experience with blockchain testing frameworks (Foundry, Hardhat), API testing tools, and cryptographic primitives.
• Bachelor s degree in Computer Science, Engineering, or related; advanced degrees or MBAs are a plus.
• Nice-to-have: experience in US financial services/fintech, ISO 20022, ZKP systems, GitOps/ArgoCD, identity frameworks, and performance testing tools (k6, JMeter).

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