Chaincode Developer

Job Title: Senior Smart Contract Developer (Chaincode)Duratioon: ContractKey ResponsibilitiesDesign and implement core payment chaincode in Go for authorization, settlement, and reconciliationBuild the automated Policy Engine enforcing approvals based on configurable rules, roles, and risk scoresImplement Private Data Collections for confidential settlement data across organizational boundariesDevelop endorsement policy logic balancing security (AND policies) with latency constraintsOptimize execution paths to minimize read/write set generation and maximize parallel validationImplement multi-currency support with atomic pathfinding for cross-currency settlementsBuild comprehensive test suites using Fabric MockStub and integration frameworksDesign zero-downtime chaincode upgrade and versioning strategiesImplement WASM-based modules for computationally intensive sandboxed operationsDevelop event emission patterns for Kafka integration and real-time webhook deliveryConduct code reviews and maintain business logic documentationEmbed KYC/AML screening logic directly into transaction chaincodeRequired Qualifications6+ years development, 3+ years smart contracts or chaincodeStrong Go proficiency with concurrent programming and performance optimizationHands-on Hyperledger Fabric chaincode development and deployment lifecycleUnderstanding of Execute-Order-Validate transaction flow implicationsExperience with Private Data Collections and cross-channel invocationsKnowledge of RocksDB key-value and CouchDB rich query interactionsFamiliarity with gRPC/Protobuf for SDK integrationEvent-driven architecture experience (Kafka, RabbitMQ)Strong testing discipline: unit, integration, and performance benchmarksBS in Computer Science or equivalentTechnical Skills RequiredCategory SkillsBlockchainFabric Chaincode, Stellar Soroban, Private Data CollectionsTestingMockStub, Fabric Integration Tests, Caliper BenchmarksPreferred QualificationsWASM/WebAssembly smart contract runtime experienceFinancial payment protocol knowledgeFormal verification or static analysis for contractsHyperledger open-source contributionsISO 20022 message format understandingJ-18808-Ljbffr