{"id":2931447,"url":"https://alion.io/job/tonetag-senior-blockchain-engineer","title":"Senior Blockchain Engineer","company":{"id":4454504,"name":"ToneTag","domain":"tonetag.com","url":"https://alion.io/company/tonetag","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":null,"truth_index":null},"role":"Web3","role_family":"Web3","seniority":"senior","employment_type":null,"work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Bengaluru, India"],"countries":["IN"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":29000,"max_usd":49000,"period":"year","method":"global_role_cell_scaled_by_country","sample_n":34},"experience_years_min":7,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Ethers.js","optional":false},{"name":"Hardhat","optional":false},{"name":"Java","optional":false},{"name":"OpenZeppelin","optional":false},{"name":"Smart Contracts","optional":false},{"name":"Solidity","optional":false},{"name":"Token Standards","optional":false},{"name":"Ethereum","optional":true},{"name":"JavaScript","optional":true}],"status":"live","first_seen_at":"2026-10-20T14:35:45Z","employer_posted_date":null,"last_verified_at":"2026-10-20T14:35:45Z","board_verified":false,"closed_at":null,"days_open":4,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":4},"description":"We're looking for a Senior Blockchain Engineer to own this platform end to end, the smart contracts, the chain operations, and the data/indexing layer that makes it usable, and to lead its technical evolution as we extend the product. This is a hands-on senior role: you'll write and review Solidity, operate the network, and set the security bar for a system that moves real money in a regulated environment.\n\nResponsibilities: \nThe smart-contract suite governing the platform's token and wallet operations (issuance, transfers, redemption, balance accounting), architecture, code, upgrades, and security sign-off\nThe permissioned network: validator set management, genesis and consensus configuration, node operations, monitoring, and disaster recovery\nThe upgrade path: proxy-based contract upgrades, multi-sig governance, and upgrade-authority custody (who can change contract logic, and how that authority is secured)\nThe indexing and read layer: the service that projects on-chain events into a queryable store powering the admin dashboards and app transaction history, including its correctness and reconciliation against on-chain state\nChain-to-application integration: the contract and event interfaces the admin console and mobile app depend on\nOperational integrity: keeping the on-chain ledger, the indexed view, and what users see consistent\nYou'll also help scope and lead new capabilities on the roadmap, deciding what genuinely belongs on-chain versus off-chain, and bringing in specialist support (audit, formal verification, and other niche skills) for high-risk components when needed.\n\nRequirements: \n3+ years of hands-on Solidity and EVM smart contract development, including contracts deployed to production that handle value.\nDeep smart-contract security knowledge: reentrancy, access control, integer safety, privileged-operation authority, upgrade-pattern risks; experience preparing contracts for third-party audits.\nHands-on experience with a permissioned EVM network, Hyperledger Besu, strongly preferred (IBFT 2.0 / QBFT): genesis configuration, validator management, and node operations.\nToken-contract experience (ERC-20-style or equivalent) with access-controlled privileged operations.\nOpenZeppelin upgradeable contracts; UUPS proxy pattern and AccessControl in production.\nStrong tooling: Hardhat, ethers.js (v5), and high-coverage testing, including all revert paths.\nSolid grasp of the indexer pattern; subscribing to on-chain events and projecting them into a database for reporting and search; comfortable owning that off-chain service.\nComfort in a backend context around the chain (Java/Web3j or Node) and with relational databases.\n\nOur stack: \nChain: Hyperledger Besu (private, EVM-compatible).\nConsensus: IBFT 2.0.\nContracts: Solidity ^0.8. 19.\nFramework: Hardhat + OpenZeppelin UUPS upgradeable proxies, AccessControl.\nKey libraries: @openzeppelin/contracts-upgradeable, ethers.js v5.\n\nStrongly preferred: \nExperience in regulated fintech/payments, ideally India (RBI-regulated environments, digital payments, wallets).\nDirect experience with tokenized money, stablecoin, or similar issue-and-redeem token systems and the controls expected around privileged operations.\nFamiliarity with multi-party permissioned networks (multiple partner institutions on one chain).\nJudgement on on-chain vs. off-chain design trade-offs and where audit/formal verification/specialist support is genuinely needed.\n\nNice to have: \nContributions to Besu, Ethereum, OpenZeppelin, or other open-source blockchain projects.\nExperience taking over and evolving an inherited codebase (documentation and knowledge transfer will be part of onboarding).\nExposure to HSM-based key management, decentralized identity (DID), or zero-knowledge proof systems.\nSkills\nBesu, Ethers, Hardhat, Hyperledger Besu, Solidity, 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