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Largeton Group

Blockchain QA Engineer

6.0/10

Largeton Group

Not specified
Remote
mid
27 days ago
cryptofintechqaweb3GolangPythonJavaScriptSolidityETLAPI testingcryptographic primitives

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Description

Responsibilities

  • •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.

Requirements

Requirements

  • •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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