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Job description
Join Largeton Group as a Blockchain QA Engineer to ensure the correctness and security of a blockchain-based financial data platform. Work with cutting-edge technologies in a remote full-time role.
Responsibilities
### 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).
About Largeton Group
Largeton Group is an information services and staffing company that provides recruitment, placement, and staffing solutions across IT, healthcare, and education sectors. They also offer web and app development, custom software services, data warehouse integration, and legacy systems modernization.