Blockchain Developer

Key Responsibilities Web3 Platform Engineering • Design and build reusable Web3 platform services for tokenization, transaction processing, blockchain connectivity, wallet integration, event ingestion, indexing, and token lifecycle management. • Build backend services that interact with blockchain nodes, smart contracts, signing systems, custody platforms, and off-chain systems. • Develop common blockchain abstraction layers that can support multiple networks, including Besu, Canton, Ethereum/EVM, Layer 2 networks, permissioned chains, and future enterprise blockchain platforms. • Build integrations with Hyperledger Besu, Ethereum-compatible networks, and permissioned EVM chains. • Implement blockchain connectivity using JSON-RPC, WebSocket subscriptions, ABI encoding/decoding, event logs, transaction submission, transaction status tracking, and smart-contract queries. • Support engineering patterns for Canton/Daml-based blockchain networks, including validator or participant connectivity, application package lifecycle, transaction authorization, and workflow integration. • Work with Daml application concepts, including DAR package deployment, versioning, installation validation, and application enablement. • Build or integrate services that support Canton-> • Partner with platform, infrastructure, and operations teams to evaluate Canton validator strategies, including self-hosted and provider-operated models where applicable. Smart Contract & Tokenization Integration Engineering • Design, develop, integrate, and review smart contracts for tokenized asset and programmable workflow use cases. • Work with Solidity, EVM token standards, upgradeable contracts, proxy patterns, access-control models, permissioned-token designs, and contract event models. • Build smart-contract interaction layers that manage ABI encoding, calldata construction, transaction simulation, event decoding, and contract state reads. • Establish engineering standards for smart-contract development, testing, deployment, versioning, rollback planning, and production change governance. • Support smart-contract security practices, including threat modeling, static analysis, fuzzing, invariant testing, and secure deployment pipelines. Wallet, Signing & Transaction Orchestration Integration • Integrate with institutional wallet, custody, signing, and authorization platforms that support tokenized asset workflows. • Design transaction orchestration workflows covering request validation, policy checks, approval routing, signing, submission, confirmation tracking, retries, exception handling, and audit logging. • Support address or account registration, transaction limits, allowlists, signing policies, approval workflows, an operational controls. Required Qualifications • 5+ years of software engineering experience building distributed systems, backend platforms, financial systems, blockchain infrastructure, custody platforms, trading systems, or high-scale transaction systems. • Strong hands-on Web3 engineering experience. • Deep understanding of Ethereum/EVM, including smart contracts, ABI encoding, transaction lifecycle, gas/fee handling, nonce management, logs/events, confirmations, and finality. • Experience building backend services that interact with blockchain nodes, wallets, smart contracts, signing systems, or custody platforms. • Experience with JSON-RPC, WebSocket subscriptions, blockchain event indexing, smart-contract integration, transaction monitoring, and blockchain data models. • Strong understanding of wallet infrastructure, transaction signing, address management, custody concepts, and key-management patterns. • Strong backend engineering skills in one or more languages such as Java, Go, Kotlin, TypeScript, Rust, Python, or C++. • Experience with APIs, microservices, event-driven architecture, messaging systems, cloud-native engineering, and production operations. • Ability to independently own complex engineering problems from design through production delivery. • Experience with Canton, Daml, validator/participant concepts, DAR deployment, or institutional blockchain workflows. Preferred Qualifications • Experience with Hyperledger Besu, permissioned EVM networks, or private blockchain deployments. • Experience with Canton, Daml, validator/participant concepts, DAR deployment, or institutional blockchain workflows. • Experience with smart-contract audits, fuzz testing, invariant testing, static analysis, formal verification, or secure smart-contract deployment. • Experience building blockchain indexers, transaction orchestration systems, custody integrations, token lifecycle platforms, or wallet-policy engines. • Experience with token standards such as ERC-20, ERC-721, ERC-1155, ERC-1400, ERC-3643, or other permissioned-token frameworks. • Experience building systems in regulated, security-sensitive, or high-value transaction environments. • Relevant blockchain certifications or training are a plus, including Besu training/certification and Digital Asset Daml/Canton-related certification paths When applying, mention the word CANDYSHOP to show you read the job post completely.