Blockchain Developer (Web3)

p>• Design and build reusable Web3 platform services for tokenization, transaction processing, blockchain connectivity, wallet integration, event ingestion, indexing, and token lifecycle management. /p> p>• Build backend services that interact with blockchain nodes, smart contracts, signing systems, custody platforms, and off-chain systems. /p> p>• 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. /p> p>• 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. /p> p>• Support engineering patterns for Canton/Daml-based blockchain networks, including validator or participant connectivity, application package lifecycle, transaction authorization, and workflow integration. /p> p>• Work with Daml application concepts, including DAR package deployment, versioning, installation validation, and application enablement. • Build or integrate services that support Canton-style workflows, institutional transaction authorization, wallet integration, and node connectivity. /p> p>• 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 /p> p>• Design, develop, integrate, and review smart contracts for tokenized asset and programmable workflow use cases. Support smart-contract security practices, including threat modeling, static analysis, fuzzing, invariant testing, and secure deployment pipelines. Wallet, Signing & Transaction Orchestration Integration /p> p>• 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. /p> p>• Support address or account registration, transaction limits, allowlists, signing policies, approval workflows, an operational controls. 5+ years of software engineering experience building distributed systems, backend platforms, financial systems, blockchain infrastructure, custody platforms, trading systems, or high-scale transaction systems. /p> p>• 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. /p> p>• Experience building backend services that interact with blockchain nodes, wallets, smart contracts, signing systems, or custody platforms. /p> p>• Experience with JSON-RPC, WebSocket subscriptions, blockchain event indexing, smart-contract integration, transaction monitoring, and blockchain data models. /p> p>• 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++. /p> p>• Experience with APIs, microservices, event-driven architecture, messaging systems, cloud-native engineering, and production operations. /p> p>• Ability to independently own complex engineering problems from design through production delivery. /p> p>• Experience with Canton, Daml, validator/participant concepts, DAR deployment, or institutional blockchain workflows. /p>