Blockchain Data Infrastructure Engineer

**Blockchain Data Infrastructure Engineer** **Company:** Kednus **Employment Type:** Full\-time / Part\-time / Contract **Work Arrangement:** Remote **Experience Level:** Senior (5–7 years) **Education:** Associate degree or equivalent experience **Role Purpose** Kednus is building institutional\-grade blockchain financial infrastructure. As a **Blockchain Data Infrastructure Engineer** , you will own the blockchain data layer that transforms complex, fragmented multi\-chain activity into standardized, reconciled, and audit\-ready financial records. You will design and build systems that make blockchain data reliable, structured, and usable for accounting, analytics, and compliance across 200\+ blockchains. **Key Responsibilities** * Build scalable ingestion pipelines for blockchain, wallet, exchange, DeFi, custodian, and off\-chain transaction data. * Normalize and standardize transactions across multiple chains, token standards, smart contracts, NFTs, stablecoins, and DeFi protocols. * Develop classification systems for blockchain activities such as swaps, transfers, staking, lending, bridging, gas fees, rewards, liquidations, and contract interactions. * Implement wallet\-level cost basis tracking, entity mapping, reconciliation, and sub\-ledger generation. * Design and maintain chain adapters and robust data quality systems (duplicate detection, missing data handling, failed transactions, and consistency checks). * Collaborate with product and accounting teams to translate blockchain events into finance\-grade transaction categories. * Build monitoring and alerting systems for indexing health, chain availability, reorgs, API latency, and provider outages. * Ensure data accuracy and reliability across large\-scale multi\-chain datasets powering institutional financial reporting. **Required Qualifications** * 5\+ years of experience in data engineering, blockchain infrastructure, crypto accounting systems, or distributed systems. * Strong understanding of blockchain fundamentals including wallets, smart contracts, token standards, RPC nodes, indexers, and event logs. * Hands\-on experience building ETL/ELT pipelines, streaming systems, or large\-scale transactional data systems. * Proficiency in **Python** , **SQL** , and **TypeScript** (or similar languages such as Go or Rust). * Experience working with APIs, RPC endpoints, webhooks, and blockchain data providers. * Strong ability to design resilient systems that handle inconsistent, missing, or conflicting data across sources. **Preferred Qualifications** * Experience with major blockchain ecosystems such as Ethereum, EVM\-compatible chains, Bitcoin, Solana, Cosmos, Polygon, Base, Arbitrum, Optimism, or Avalanche. * Familiarity with DeFi protocols, bridges, custodians, centralized exchanges, and tokenized real\-world assets. * Experience with graph databases, entity resolution, wallet clustering, or fraud detection systems. * Understanding of crypto accounting principles and financial treatment of blockchain transactions. **First 90\-Day Success Outcomes** * Deliver a prioritized roadmap for blockchain chain coverage expansion. * Build reusable and scalable chain adapter architecture. * Establish a standardized transaction normalization schema across supported chains. * Improve accuracy of transaction classification and reconciliation systems. * Strengthen overall data reliability for institutional\-grade reporting.