Principal Product Marketing Manager - Remote CirclePrincipal Product Marketing Manager - RemoteSan Diego, CARemote$185,000–$237,500 / yearIn this role, you’ll partner closely with Product, Business Development, Marketing teams, and other cross-functional roles to bring new global payment products and solutions to market by focusing on the intersection of traditional finance and onchain programmable payments - powered by stablecoins. Circle’s platform includes the world’s largest regulated stablecoin network anchored by USDC, Circle Payments Network for global money movement, and Arc, an enterprise-grade blockchain designed to become the Economic OS for the internet.
VP, Global Head of Product Security and Risk - Remote CircleVP, Global Head of Product Security and Risk - RemoteLos Angeles, CARemote$317,500–$365,000 / yearThis role requires both strategic vision and operational rigor: you will architect the systems, governance models, and organizational capabilities that ensure Circle’s products are designed, launched, and operated with strong, risk-based controls from inception through global scale. Circle’s platform includes the world’s largest regulated stablecoin network anchored by USDC, Circle Payments Network for global money movement, and Arc, an enterprise-grade blockchain designed to become the Economic OS for the internet.
Senior Blockchain Developer InterSources Inc.Senior Blockchain DeveloperChesterfield, MOAs a Blockchain Developer, you are responsible for developing application features and interfaces using blockchain technology. • Architect, develop and deploy decentralized applications providing permissioned access to data at both the smart contract and protocol level.
Blockchain Developer - Dallas, TX Photon Interactive UK LtdBlockchain Developer - Dallas, TXDallas, TXAs a Blockchain Developer, you will be responsible for designing, implementing, and supporting a variety of blockchain-based projects, ensuring their security, reliability, and performance. Responsibilities: • Blockchain Development: • Design, develop, and implement blockchain solutions, including smart contracts and decentralized applications (DApps).
Blockchain Developer S.W.I.F.T. SCRLBlockchain DeveloperManassas, VAWe were established to find a better way for the global financial community to move value - a reliable, safe and secure approach that the community can trust, completely. At Swift, we are dedicated to building a workplace where people can bring their full selves and ideas to the team, so if you are excited about this role, we encourage you to apply even if you do not meet every single qualification.
Blockchain Developer _ Digital Assets Tata Consultancy Services LtdBlockchain Developer _ Digital AssetsCharlotte, NC$110,000–$125,000 / yearStrong communication, collaboration, and team building skills with proficiency in grasping new technical concepts quickly. Integrate wallets, custody platforms, and key-management systems (HSM/MPC) for secure asset operations.
Archon Labs - Blockchain Developer deCircleArchon Labs - Blockchain DeveloperSan Francisco, CaliforniaWe are hiring a Blockchain Developer to build data-driven systems and smart contracts that power risk analytics and allocation workflows in decentralized finance. You will work across on-chain and off-chain data, deliver secure Solidity contracts, and ship reliable services that integrate blockchain data with internal platforms.
Blockchain Developer Pyramid, IncBlockchain DeveloperPlano, TXFull timeExperience coding for fungible tokens (erc20) and non-fungible tokens (er,155). Our client is a leading Banking & Financial Industry and we are currently interviewing to fill this and other similar contract positions.
FSO Audit - Blockchain Developer - Senior - Bay Area Ernst & Young Global LtdFSO Audit - Blockchain Developer - Senior - Bay AreaSan Francisco, CA$102,500–$187,900 / yearIf you have a disability and either need assistance applying online or need to request an accommodation during any part of the application process, please call 1-800-EY-HELP3, select Option 2 for candidate related inquiries, then select Option 1 for candidate queries and finally select Option 2 for candidates with an inquiry which will route you to EY's Talent Shared Services Team (TSS) or email the TSS at ssc.customersupport@ey.com. You will be a part of the Digital Asset Research Center, an innovative and collaborative group of software developers, financial auditors and technology consultants who are dedicated to developing the deep technical understanding, methodology and tools required to deliver a variety of Assurance services to companies that hold and transact in digital assets.
Senior Blockchain Java Springboot Developer ApolisSenior Blockchain Java Springboot DeveloperChicago, IL$50–$60 / hourThe Blockchain Developer will represent the Digital Asset Innovation development team and play a key role supporting the digital transformation of assets and asset servicing functions leveraging emerging technologies such as cloud technologies, distributed ledgers, machine learning, cognitive algorithms etc., to position Client to be a key participant in the digital future. A blockchain developer specializes in designing, building, and maintaining decentralized applications (dApps) and blockchain networks (like Ethereum or Solana) using cryptographic protocols and distributed ledger technology.
Blockchain Developer MastarRecBlockchain DeveloperSeattle, WashingtonMastarRec is hiring a Blockchain Developer to support innovative financial technology platforms operating across the United States. Design, develop, and deploy smart contracts using Solidity on Ethereum and compatible EVM blockchains.
Blockchain/Solidity Developer Helius Technologies Pte LtdBlockchain/Solidity DeveloperCAAbout: We're looking for a passionate, self-motivated, team player Blockchain/Solidity Developer to help us build the next generation of financial products ecosystem. You will be responsible for ensuring a consistent, high-quality products that deliver great user experience across the ecosystem with robustness and security.
Digital Assets - Blockchain Software Developer Franklin Resources IncDigital Assets - Blockchain Software DeveloperStamford, CTRemote$125,000–$165,000 / yearWe also offer a comprehensive benefits package, which includes a range of competitive healthcare options, insurance, and disability benefits, employee stock investment program, learning resources, career development programs, reimbursement for certain education expenses, paid time off (vacation / holidays / sick / leave / parental & caregiving leave / bereavement / volunteering / floating holidays) and a motivational wellbeing program. The team consists of experienced engineers who collaborate closely with product and design partners to research, experiment, and deliver secure solutions that tokenize securities across multiple blockchain platforms.
Rust Developer - Blockchain & Web3 Inner Circle AgencyRust Developer - Blockchain & Web3New YorkRemoteWe’re looking for a skilled Rust Developer to build cutting-edge blockchain applications, optimize smart contract execution, and contribute to high-performance decentralized solutions. As a Smart Contract Engineer , you’ll be responsible for writing secure and efficient smart contracts for DeFi applications, NFT platforms, and various blockchain projects.
Blockchain Java Backend Developer Tata Consultancy Services LtdBlockchain Java Backend DeveloperJersey City, NJ$100,000–$130,000 / yearExperience integrating backend services with blockchain networks/nodes: o Ethereum-compatible networks (Ethereum/Polygon/BSC) using Web3j, ethers-style approaches. Experience supporting large blockchain deployments: o Node connectivity, RPC management, event indexing, chain reorg handling, retry strategies.
Digital Assets Blockchain Java Developer - AVP Citigroup IncDigital Assets Blockchain Java Developer - AVPNew York, NY$121,200–$181,800 / yearAs a member of the Citi Integrated Digital Assets Platform engineering team, you will work alongside a team of highly motivated, T-shaped individuals who think creatively and seek innovative opportunities for commercial impact. A Digital Assets Platform Blockchain Engineer (AVP) must be a motivated and proactive hands-on software engineer (Back End, Java Focus), with demonstrated ability and experience working with web applications in production.
Lead Software Engineer - Blockchain Developer JPMorgan Chase Bank, N.A.Lead Software Engineer - Blockchain DeveloperJersey City, NJFull timeAs a Lead Software Engineer at JPMorgan Chase within Commercial and Investment Banking team, you will play a key role in an agile team dedicated to building, enhancing, and delivering trusted, market-leading technology products. JPMorganChase, one of the oldest financial institutions, offers innovative financial solutions to millions of consumers, small businesses and many of the world's most prominent corporate, institutional and government clients under the J.P.
Principal Software Engineer(Blockchain) - Dallas, TX Photon Interactive UK LtdPrincipal Software Engineer(Blockchain) - Dallas, TXDallas, TXExperience in Cloud technologies including Docker, Kubernetes, AWS, Azure • Experience on CD process and tools, testing frameworks and practices (GitHub, Jenkins, uDeploy, Stash) • Excellent understanding of Relational Databases, SQL, and ORM technologies (JPA2, Hibernate) • Strong understanding of REST API and Implementing Microservices • Design and develop database schema, PL/SQLs, stored procedures, and transactional SQL within DB2 / Oracle databases. • Bachelor's degree or higher in Computer Science Engineering/ Information Technology, Information Systems • 12+ years of hands on technical experience • Strong team player that thrives in a collaborative environment • Strong written and verbal communication skills • Quick learner and a great team player • Experience in the financial services industry, preferably in the Digital Asset.
Senior Software Engineer(Blockchain) - Dallas, TX Photon Interactive UK LtdSenior Software Engineer(Blockchain) - Dallas, TXDallas, TXCollaborate with DevOps engineering to implement continuous integration and deployment using Jenkins and uDeploy tools; analyzing code quality issues using Sonar; implementing application resiliency procedures using HP Operations Orchestration; and process management using HP Service Manager and ServiceNow. Using business knowledge to translate the vision for divisional initiatives into business solutions by developing sophisticated or multiple software applications and conducting studies of alternatives.
Tax Director - Blockchain and Digital Assets - Cryptocurrency BPM LLPTax Director - Blockchain and Digital Assets - CryptocurrencyCA$115,000–$215,000 / yearWe support clients with: • Token economics and token-flow analysis • Cross-border structuring and international tax planning • Revenue recognition frameworks and digital-asset accounting • Institutional adoption initiatives, including stablecoin use cases and RWA tokenization • Governance, risk, and compliance programs • Educational materials, research reports, and market insights that help clients and regulators navigate a fast-evolving landscape. Consistent with leading global advisory practices, this role includes a meaningful contribution to the firm's market perspective and external visibility: • Stay attuned to market trends, regulatory shifts, developments in DeFi and stablecoin design, token-economics structures, and broader institutional adoption of blockchain technologies.
NewSenior Counsel, Blockchain & Global Regulatory Strategy CircleSenior Counsel, Blockchain & Global Regulatory StrategyMinneapolis, MN$230,000–$297,500 / yearCircle's platform includes the world's largest regulated stablecoin network anchored by USDC, Circle Payments Network for global money movement, and Arc, an enterprise-grade blockchain designed to become the Economic OS for the internet. Reporting to the Assistant General Counsel, Arc, you will advise on the design and operation of the Arc network, partnering closely with senior leaders across Product, Engineering, Compliance, and Policy to navigate complex global regulatory landscapes.
NewSenior Counsel, Arc Blockchain & Regulatory Affairs CircleSenior Counsel, Arc Blockchain & Regulatory AffairsAustin, TX$230,000–$297,500 / yearCircle's platform includes the world's largest regulated stablecoin network anchored by USDC, Circle Payments Network for global money movement, and Arc, an enterprise-grade blockchain designed to become the Economic OS for the internet. Reporting to the Assistant General Counsel, Arc, you will advise on the design and operation of the Arc network, partnering closely with senior leaders across Product, Engineering, Compliance, and Policy to navigate complex global regulatory landscapes.
NewStrategic Counsel, Arc Blockchain & Regulatory CircleStrategic Counsel, Arc Blockchain & RegulatoryColumbus, OH$230,000–$297,500 / yearCircle's platform includes the world's largest regulated stablecoin network anchored by USDC, Circle Payments Network for global money movement, and Arc, an enterprise-grade blockchain designed to become the Economic OS for the internet. Reporting to the Assistant General Counsel, Arc, you will advise on the design and operation of the Arc network, partnering closely with senior leaders across Product, Engineering, Compliance, and Policy to navigate complex global regulatory landscapes.
Tax Director - Blockchain/Digital Assets - Cryptocurrency BPMTax Director - Blockchain/Digital Assets - CryptocurrencyUnited States, CAResearch, Market Intelligence, and Thought LeadershipConsistent with leading global advisory practices, this role includes a meaningful contribution to the firm’s market perspective and external visibility:•Stay attuned to market trends, regulatory shifts, developments in DeFi and stablecoin design, token-economics structures, and broader institutional adoption of blockchain technologies.•Lead or co-author thought-leadership materials such as white papers, executive briefs, technical alerts, and market commentary that shape BPM’s public voice in the digital-asset ecosystem.•Interpret industry developments and emerging technologies to inform client strategies, tax planning approaches, and internal guidance frameworks.•Deliver presentations and educational content that clearly articulate complex digital-asset issues for clients, conferences, industry groups, and internal leadership.•Partner with practice leaders to establish thematic priorities, publication pipelines, and coordinated external messaging across the digital-asset practice. We support clients with:•Token economics and token-flow analysis•Cross-border structuring and international tax planning•Revenue recognition frameworks and digital-asset accounting•Institutional adoption initiatives, including stablecoin use cases and RWA tokenization•Governance, risk, and compliance programs•Educational materials, research reports, and market insights that help clients and regulators navigate a fast-evolving landscapeThis environment offers both substantive technical work and opportunities to shape the firm’s view of the market through research, publication, and external engagement.
Senior Blockchain Engineer - Digital Assets Platform - VP Citigroup IncSenior Blockchain Engineer - Digital Assets Platform - VPNew York, NY$142,320–$213,480 / yearThe ideal candidate will be a self-driven, proactive, strong enterprise developer and resourceful team player who can comfortably work with a large team of highly motivated individuals within Citi's larger software engineering network. As a member of the Citi Integrated Digital Assets Platform engineering team, you will have to opportunity to work with a team of highly motivated, T-shaped, smart individuals who think out of the box and look for disruptive opportunities for commercial benefit.
Infrastructure Engineer, Blockchain (Remote - USA) TempoInfrastructure Engineer, Blockchain (Remote - USA)RemoteTempo is a layer-1 blockchain purpose-built for stablecoins and real-world payments, born from Stripe’s experience in global payments and Paradigm’s expertise in crypto tech. Deep expertise deploying Kubernetes within production environments and working with IaC and configuration management tools like Terraform, Helm and ArgoCD.
Blockchain Partner Manager, Ecosystems Circle Internet Financial LLCBlockchain Partner Manager, EcosystemsPortland, ORRemote$140,000–$185,000 / yearCircle's platform includes the world's largest regulated stablecoin network anchored by USDC, Circle Payments Network for global money movement, and Arc, an enterprise-grade blockchain designed to become the Economic OS for the internet. This role is heavily focused on maintaining strong partner health, driving ecosystem alignment, and supporting growth initiatives tied to USDC, EURC, USYC, CCTP, and other core Circle products.
Senior Staff Software Engineer - Blockchain Platform Coinbase Global IncSenior Staff Software Engineer - Blockchain PlatformCA$253,895–$298,700 / yearLead end-to-end design and rollout of large, cross-team architectural initiatives (e.g., wallet stack rearchitecture, indexing stack redesign, asset identifier system), breaking high ambiguity into clear milestones and measurable outcomes. Represent Blockchain Platform in executive and cross-org forums, clearly communicating tradeoffs, aligning stakeholders on strategy, and securing buy-in for high-impact technical bets including emerging areas like Yield and Stablecoins.
Senior Blockchain Intelligence Analyst, Ransomware TRM LabsSenior Blockchain Intelligence Analyst, RansomwareYou should be equally comfortable tracing funds across blockchains, identifying laundering and cash-out infrastructure, correlating technical, financial, and behavioral signals, and synthesizing fragmented data into clear, defensible intelligence that enables internal and external partners to make informed operational decisions. Partner closely with internal and external stakeholders, including investigators, threat intelligence teammates, product teams, and public-sector or private-sector partners, to ensure analytical outputs reflect real investigative tradecraft and support cross-functional operations.
Blockchain Operations Engineer S.W.I.F.T. SCRLBlockchain Operations EngineerManassas, VAPlease note that this mailbox is not monitored for general recruitment enquiries and should only be used for accessibility or accommodation-related requests (for example related to vision, hearing or neurodiversity). We were established to find a better way for the global financial community to move value - a reliable, safe and secure approach that the community can trust, completely.
Senior Blockchain Infra Engineer (DevOps/Go) Hyphen Connect LimitedSenior Blockchain Infra Engineer (DevOps/Go)Your role will focus on managing distributed validator sets and automating infrastructure through Infrastructure as Code (IaC) for Web3 developers. Collaborate with cross-functional teams to design, develop, and deploy scalable Web3 solutions.
Software Engineer, Developer Experience & SDKs Stellar Development FoundationSoftware Engineer, Developer Experience & SDKsSan Francisco, CA$140,000–$210,000 / yearPowered by a decentralized, fast, scalable, and uniquely sustainable network made for financial products and services and a thriving and passionate ecosystem that includes a non-profit organization driven by a mission, Stellar is paving the path to unlock the worlds economic potential through blockchain technology. Built with speed and low costs in mind, the Stellar network provides builders and financial institutions worldwide a platform to issue assets, and to send and convert currencies in real time creating real world utility.
Senior Web3 Developer (3 Positions) PeopleNTech LLCSenior Web3 Developer (3 Positions)Santa Clara, CADesign, develop, and maintain scalable Web3-enabled applications Integrate blockchain interactions using Web3 libraries. ·Strong programming expertise in Java and TypeScript Hands-on experience with Web3 libraries (e.g., web3.js, ethers.js) .
Smart Contract/Solidity Developer Harris AlliedSmart Contract/Solidity DeveloperNew York, NY$150,000–$180,000 / yearFinancial Technology industry leader has an immediate need for a Blockchain/Smart Contract Developer to join their world class technology team in a full time role based in midtown Manhattan. The individual in this exciting role is responsible for the development of blockchain-based applications and decentralized applications (dApps), from smart contract design to intuitive and high-performing blockchain integration.
NewSalesforce Developer VivSoft TechnologiesSalesforce DeveloperHerndon, VARemoteFull timeVivSoft is a diverse team of strategists, engineers, designers, and creators experienced in building high-performance, effective software, with a focus on impactful organisational design and software delivery dynamics. Develop Flow-based automation: record-triggered flows, screen flows, subflows, before/after save contexts, and invocable actions supporting the assigned feature area.
NewNode.js Developer (TypeScript) ApTaskNode.js Developer (TypeScript)Alpharetta, GA$50–$52 / hourThe company's commitment to innovation, combined with its industry expertise, positions it as a leader in driving technological advancements and helping financial institutions stay competitive in a rapidly evolving market. With a focus on banking, capital markets, and insurance, it leverages cutting-edge technologies such as blockchain, artificial intelligence, and data science to deliver customized IT solutions and business consulting services.
Python React Developer ApTaskPython React DeveloperNew york city, NY$56–$60 / hourThe company's commitment to innovation, combined with its industry expertise, positions it as a leader in driving technological advancements and helping financial institutions stay competitive in a rapidly evolving market. With a focus on banking, capital markets, and insurance, it leverages cutting-edge technologies such as blockchain, artificial intelligence, and data science to deliver customized IT solutions and business consulting services.
Java Developer ApTaskJava DeveloperCharlotte, NC$55–$59 / hourThe company's commitment to innovation, combined with its industry expertise, positions it as a leader in driving technological advancements and helping financial institutions stay competitive in a rapidly evolving market. With a focus on banking, capital markets, and insurance, it leverages cutting-edge technologies such as blockchain, artificial intelligence, and data science to deliver customized IT solutions and business consulting services.
Senior Solutions Developer, Prototyping and Customer Engineering (PACE) AmazonSenior Solutions Developer, Prototyping and Customer Engineering (PACE)Seattle, WAsoftware development, cloud computing, systems engineering, infrastructure, security, networking, data & analytics) experience - 3+ years of design, implementation, or consulting in applications and infrastructures experience - 10+ years of IT development or implementation/consulting in the software or Internet industries experience Preferred Qualifications - Experience in at least one modern scripting or programming language, such as Python, Java, Scala, or NodeJS - Experience with iterative, agile development methodologies (including scrum) - Experience in software development, or experience managing full application stacks from the OS up through custom applications and experience that includes strong analytical skills, attention to detail, and effective communication abilities - Knowledge of presentations and whiteboarding skills with a high degree of comfort speaking with internal and external executives, IT management, and developers - Experience building AWS cloud-native serverless solutions using AWS SDK. Key job responsibilities -Engage with customers on a specific use case to determine desired outcomes, define a scope and design and implement it (code, CDK, docs) with a small team of developers in 6 weeks -Identify opportunities to scale your impact through internal and external facing initiatives -Mentor others A day in the life While on a customer prototype engagement, you will work collaboratively with other developers, Customer Success Manager and specialists to deliver results.
Full Stack Developer With React & Ruby Zunch LabsFull Stack Developer With React & RubyPlano, TexasRemoteShould be hands on in Object Oriented Languages (Java, C# and Go), Cloud Based Technologies (AWS, DevOps and Serverless), Front End Frameworks (Angular, React JS, Spring Boot, Spring React, Node.js), Cutting Edge Data Tools (Python, Spark, Machine Learning) and Next Generation technologies (AI, Blockchain) etc. THE COMPANY : Each day, Zunch Labs Telecom Solutions connects people to meaningful work across the wide range of telecom skills and is on the cutting-edge of the 5G and digital transformation of the telecom sector and we are known for the great care we take with clients and employees alike.
Senior BI Report Developer VivSoft TechnologiesSenior BI Report DeveloperHerndon, VARemoteFull timeVivSoft is a diverse team of strategists, engineers, designers, and creators experienced in building high-performance, effective software, with a focus on impactful organisational design and software delivery dynamics. The Senior BI Report Developer will design, develop, and deliver advanced dashboards, reports, and analytics solutions that transform complex data into actionable insights, enabling informed decision-making across the organization.
NewSaaS Platform Developer VivSoft TechnologiesSaaS Platform DeveloperHerndon, VARemoteFull timeVivSoft is a diverse team of strategists, engineers, designers, and creators experienced in building high-performance, effective software, with a focus on impactful organisational design and software delivery dynamics. The SaaS Platform Developer will design, configure, develop, test, and deploy OneStream-based solutions supporting DLA's financial transformation initiatives.
Senior Data Warehouse Specialist/ETL Developer VivSoft TechnologiesSenior Data Warehouse Specialist/ETL DeveloperHerndon, VARemoteFull timeThe Senior Data Warehouse Specialist / ETL Developer will be responsible for designing, developing, and maintaining enterprise data pipelines, data warehouses, and data integration solutions to support analytics, reporting, and decision-making across large-scale systems. VivSoft is a diverse team of strategists, engineers, designers, and creators experienced in building high-performance, effective software, with a focus on impactful organisational design and software delivery dynamics.
Senior Software Developer VivSoft TechnologiesSenior Software DeveloperHerndon, VARemoteFull timeVivSoft is a diverse team of strategists, engineers, designers, and creators experienced in building high-performance, effective software, with a focus on impactful organisational design and software delivery dynamics. The Senior Software Developer serves as a key technical expert responsible for designing, developing, modernizing, and sustaining low-code applications that support FMCSA’s mission-critical business processes.
Dot Net Developer (Remote) Helius Technologies Pte LtdDot Net Developer (Remote)RemoteJob Responsibilities Code, test and debug best in class software programs on the MS .NET Platform, which includes front-end, middle-tier and back-end applications and services Provide input into the architecture and design of software solutions Support the development of estimates Active involvement in all phases of software development life cycle including analysis, design, development, testing and support Maintain accurate and up to date documentation of code and its changes Provide assistance to junior developers Take ownership of the quality and timeliness of deliveries Adhere to Software Development policies and guidelines. In addition to possessing good communication skills, being self-motivated, focused on delivery and paying attention to detail, the candidate should have excellent knowledge and experience in the following technologies/areas: Primary skills (Must have): C# with good understanding of OOPS, design patterns and multi-threading ASP.Net MVC, RESTful services, WCF, JQuery, Java Script Good knowledge of SQL Server & T-SQL Strong analytical and problem solving skills Ability to understand business requirements and translate them into technical requirements.
NewBack-End Block Chain Developer IV StratAcuity Staffing Partners IncBack-End Block Chain Developer IVNew York, NYIn terms of professional development, Everforth Apex hosts an on-demand training program, provides access to certification prep and a library of technical and leadership courses/books/seminars once you have 6+ months of tenure, and certification discounts and other perks to associations that include CompTIA and IIBA. Experience with cryptographic protocols (e.g., having implemented or audited a key exchange or signature scheme) and knowledge of common pitfalls (like poor random number generation or improper error handling leaking information) are essential.
Front-End Developer Injective FoundationFront-End DeveloperDevelopers can rapidly launch premier financial applications suited for mass adoption using Injective's infrastructure and specialized DeFi primitives such as the world's first fully on-chain order book. This role is for someone who thrives in fast-paced environments, likes working with high ownership, and can operate effectively in highly technical environments.
Core Java / Spring Boot Developer Damco Solutions IncCore Java / Spring Boot DeveloperCharlotte, NCBlockChain " Design, develop, and maintain microservice -based applications using Java and Spring Boot. " Collaborate in Agile Scrum ceremonies (daily standups, sprint planning, retrospectives).
Senior Java GraphQL Developer Abode Techzone LLCSenior Java GraphQL DeveloperDAllas, TXStrong experience building GraphQL APIs (Apollo, graphql-java, or similar). Familiarity with Ethereum, Hyperledger Fabric, or other blockchain frameworks .