Top Blockchain Developer Jobs

Leads software engineering within agile teams by designing, developing, testing, and troubleshooting secure, scalable Java or Python applications. Builds blockchain solutions, including Ethereum smart contracts and decentralized applications, and uses AWS to deploy cloud systems. Contributes to architecture, resiliency, CI/CD, data analysis, and production stability. Drives responsible adoption of AI-assisted engineering tools, establishes validation standards, and coaches engineers on secure and compliant usage.

Design, develop, test, and deploy Web3 components for Citi’s digital assets platform. Build Java and Node.js backend services integrating public and permissioned blockchains, develop and audit smart contracts, manage on-chain events, and support tokenization, custody, and settlement solutions. Collaborate on secure, scalable infrastructure, participate in Agile delivery and code reviews, document architectures, and resolve technical issues across the Web3 stack.

Lead engineering teams building secure, scalable digital asset custody and blockchain platform capabilities. Define roadmaps for wallet and key management, blockchain connectivity, transaction processing, tokenization, and settlement. Architect integrations with custody providers, blockchain networks, and enterprise systems. Own security-by-design, production reliability, CI/CD, observability, incident management, disaster recovery, and compliance controls while mentoring engineers and partnering across cybersecurity, risk, legal, operations, and product teams.

Develop enterprise blockchain applications, smart contracts, decentralized applications, APIs, wallet integrations, tokenization platforms, and blockchain backend services. The role integrates Ethereum-compatible and enterprise blockchain networks with cloud-native microservices on Azure and AWS. Responsibilities include architecture, development, security auditing, performance optimization, deployment, troubleshooting, and production support for high-volume distributed transaction systems.

Develop a custom Shopify-integrated POS system connecting NFT ticketing with physical merchandise sales. Build real-time synchronization between digital assets and physical inventory, integrate secure crypto and fiat payment gateways, customize POS software and hardware, and support fraud prevention, loyalty programs, and inventory management integrations.

Build AI-driven systems for blockchain security, including smart contract analysis, vulnerability discovery, exploit analysis, threat detection, and security investigations. Develop AI agents that reason over codebases, protocol interactions, transactions, and wallet activity. Collaborate with security researchers and infrastructure teams on monitoring and incident response while researching blockchain attack techniques, Web3 infrastructure, and AI security trends.

Leads technical strategy, architecture, and hands-on delivery for blockchain integrations and digital asset products. Owns public-chain connectivity, interoperability, on-chain/off-chain workflows, security engineering, protocol evaluation, and roadmap development. Mentors senior engineers, establishes engineering standards, and advises executives. Also governs agentic AI-enabled development workflows, including validation, security, auditability, testing, incident response, and responsible AI controls across engineering teams.

Validate and test blockchain and Web3 products across the development lifecycle: create and run test plans, validate smart contract and wallet interactions, test APIs and web platforms, track and verify bugs, collaborate on releases, and improve automation, reliability, performance, and security.

Design and implement smart contracts and blockchain-based applications, build backend integrations with blockchain networks, participate in architecture and security reviews, improve scalability and reliability, mentor engineers, and collaborate with product and design to ship production-ready Web3 products.

Build and maintain cross-platform React Native mobile apps integrated with blockchain (smart contracts, wallets, tokenization). Implement features for validator registration, asset verification, and marketplace functionality. Collaborate with backend and design teams, ensure security and compliance (KYC, token handling), optimize performance, and support CI/CD and deployment workflows.

Develop, test, deploy, and maintain Ethereum/EVM blockchain applications, smart contracts, and Web3 integrations. Collaborate with engineering, product, compliance, and security teams to deliver secure, scalable software. Translate business requirements into quality code, participate in design discussions and code reviews, troubleshoot production issues, and improve automation and development practices. Support cloud-native, containerized applications while applying secure coding and operational excellence standards.

Architect and build resilient blockchain infrastructure for digital asset transactions across multiple networks. Develop Go-based gRPC microservices with event-driven architecture, implement reliable transaction state machines, integrate custody providers, monitor blockchain activity, respond to production incidents, and support client technical teams. The role requires expertise in distributed systems, blockchain protocols, databases, message streaming, and secure transaction processing.

Design and maintain cross-chain integrations, build transaction creation/signing and status-tracking flows, integrate liquidity/exchange/bridge providers, improve route safety and execution reliability, and help set architecture and engineering standards with product and platform teams.

Design, develop, test, audit, and deploy smart contracts and dApps. Integrate wallets, blockchain APIs, and Web3 infrastructure. Optimize for performance and gas efficiency, collaborate with cross-functional teams, monitor production systems, research emerging protocols, and document technical specifications.

Design, implement, and maintain blockchain infrastructure and dApps. Develop and review smart contracts, optimize consensus and cryptography for scalability and security, troubleshoot performance and reliability issues, and collaborate with product and design teams to deliver features while staying current with blockchain advancements.

Design, develop, and support production-grade smart contracts, Ethereum/EVM applications, and Web3 integrations. Lead architecture and technical design, ensure scalability and security, participate in code and architecture reviews, mentor engineers, evaluate blockchain technologies, and build cloud-native services using containerization and CI/CD. Collaborate with product, compliance, security, and engineering teams while advancing testing, automation, software quality, and operational excellence.

Build and operate blockchain network infrastructure integrating protocols such as Bitcoin and Ethereum with internal services. Design reliable APIs, SDKs, data contracts, observability, and SLOs; lead multi-quarter chain integrations, architecture modernization, and migrations. Improve latency, reliability, and cost for high-throughput distributed systems while owning production services and on-call responsibilities.

Senior individual-contributor backend engineer responsible for designing, building, and operating production-grade, highly available, strongly consistent services for wallet operations, transaction orchestration, blockchain integrations, and event-driven workflows. Implement secure, scalable APIs, cryptographic key management, Kafka-based event systems, observability with OpenTelemetry, CI/CD pipelines, and produce tests, API specs, and operational runbooks.

Build and maintain secure blockchain applications across custody contracts, transaction signing, orchestration, and key management. Own features end to end, contribute to technical design, coordinate delivery, review code, investigate production issues, and collaborate with neighboring systems. The role requires strong blockchain and cryptography knowledge, automated testing, AI coding assistant experience, clear communication, and the ability to work remotely across U.S. or Canada.

Design, build, and operate high-throughput blockchain infrastructure using Go and Rust. Own distributed systems end to end, including architecture, performance optimization, security, testing, deployment, observability, incident response, and reliability. Lead technical designs and code reviews, mentor engineers, debug complex production issues, and collaborate across Product, Infrastructure, Security, and Developer Experience teams.

Develop backend blockchain functionality for Cardax DEX on the Cardano blockchain. Write and maintain smart contracts in Plutarch and Haskell that define the constraints and conditions for decentralized token exchange without a central entity.

Own performance optimization, reliability, observability, capacity modeling, and automated failover for Coinbase’s blockchain node infrastructure. Diagnose resource bottlenecks, reduce infrastructure costs, define SLOs and SLIs, support protocol upgrades, and improve node performance across distributed systems at scale. Collaborate with protocol integration, wallet, and indexer teams while applying backend programming and systems profiling expertise.

Build foundational blockchain infrastructure for a high-performance trading platform. Responsibilities include implementing consensus protocols and state machines, integrating Ethereum-compatible execution clients, developing cryptographic validator authentication and signature aggregation, optimizing block times and transaction throughput, improving state storage, and designing scalable P2P systems. The role requires strong Rust, distributed systems, cryptography, networking, and low-level storage expertise, with in-person collaboration and U.S. work authorization.

Build and operate DeFi yield vaults, including Solidity smart contracts, backend services, NAV and redemption systems, automated on-chain operations, monitoring, and risk tooling. Review new protocols, assess security and yield strategies, manage rebalancing transactions, collaborate with auditors, and help ensure vaults operate safely around the clock.

Build software at Coinbase while responsibly using and integrating generative AI copilots (e.g., LibreChat, Gemini, Glean). Continuously learn evolving tools, apply human-in-the-loop practices, and deliver business-ready outputs that improve efficiency, cost, and quality. Participate in quarterly in-person working sessions as part of a remote-first culture.