Web3 Jobs in United States

23,525 jobs found

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Job Position Company Posted Location Salary Tags

Largeton Group

New York, NY, United States

$0k

Draper University

San Mateo, CA, United States

$105k - $165k

Beacon

San Francisco, CA, United States

$106k - $112k

Chainlink Labs

Dallas, TX, United States

$86k - $117k

Blockdaemon

United States

$80k - $130k

Polymarket

New York, NY, United States

$90k - $112k

Polymarket

New York, NY, United States

$98k - $108k

Polymarket

New York, NY, United States

$98k - $108k

Impossible Cloud

United States

$105k - $147k

Tata Consultancy Services

New York, NY, United States

$100k - $130k

Referment

New York, NY, United States

$175k - $250k

Ondo Finance

United States

$140k - $240k

Perena

United States

$81k - $107k

Signature IT World Inc

United States

$77k - $84k

ThoughtStorm

United States

$77k - $84k

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).