Top Blockchain Jobs in New York City, NY

Develop and advance Mastercard’s global AI policy positions, narratives, and advocacy strategies. Advise internal executives, business units, government affairs teams, regulators, and standards bodies on AI legislation, regulation, governance, standards, and emerging risks. Translate AI business objectives into policy frameworks, produce policy briefs and executive materials, support consultations and thought leadership, and promote consistent, innovation-enabling AI policies across global markets.

Lead finance partner for Blockchain & Digital Currencies, responsible for budgeting, forecasting, month-end close, variance analysis, investment prioritization, vendor/business case evaluation, executive reporting, and process improvements to drive disciplined growth and financial performance.

Build and operate database and storage platform software, services, APIs, and developer tools. Solve scaling, performance, reliability, and data correctness challenges across distributed systems, cloud infrastructure, and backend services. Partner with engineering teams on schema design, migrations, and platform adoption; lead technical projects through rollout and operational ownership, including on-call and incident response. Use AI-assisted tools thoughtfully while balancing performance, cost, maintainability, and developer experience.

Build and operate database and storage platform software, including services, APIs, developer tools, provisioning automation, migrations, upgrades, and scaling solutions. Solve distributed systems and database performance challenges while ensuring reliability, correctness, and availability. Partner with engineering teams on schema design and platform adoption, lead technical projects through rollout and operations, participate in on-call response, and use AI tools thoughtfully in development.

Own application security for backend services, APIs, cloud infrastructure, and edge systems handling financial transactions. Responsibilities include validating red-team findings, assigning severity, hardening services, implementing WAF and rate-limiting defenses, creating automated security configuration checks, expanding pull-request security gates, reviewing architectures, managing attack-surface coverage, and evaluating security tools. The role also partners with engineers and Security Operations to drive effective remediation.

Own the full sales cycle for financial infrastructure products, targeting CTOs, engineering leaders, and payment executives. Conduct technical discovery, map money flows and technology stacks, lead demos and proofs of concept with engineering teams, manage pipeline using sales and AI tools, navigate procurement and compliance reviews, and close deals typically worth $100K–$300K ACV. Translate technical and financial concepts across engineering and finance stakeholders while feeding customer insights into product development.

Own end-to-end revenue and partnership accounting, including month- and quarter-end close, reconciliations, journal entries, subledger reviews, variance analysis, revenue recognition, incentive accounting, disclosures, controls, and audit support. Apply ASC 606 and US GAAP to complex arrangements while partnering with commercial, legal, tax, and data teams. Design AI and automation solutions using ChatGPT and Gemini to improve efficiency, quality, governance, and auditability.

Build and operate foundational developer infrastructure across CI, build systems, deployment orchestration, and test platforms. Improve build speed, deployment safety, test reliability, observability, and engineering productivity at scale. Own services from architecture through production, including SLOs and on-call operations. Lead cross-functional technical projects, partner with engineering teams, mentor engineers, and shape platform strategy.

Own the architecture and technical direction of a React Native mobile application for DeFi trading across iOS and Android. Lead feature development from design through release, establish engineering standards, improve performance and reliability, guide engineers, integrate APIs and real-time data, manage app-store releases, monitor production health, and troubleshoot complex issues. Collaborate with Product, Design, and Backend teams to deliver scalable, intuitive financial experiences.

Conduct application security assessments, discover and validate vulnerabilities, analyze complex codebases, build custom security tooling, perform threat modeling and architecture reviews, and deliver actionable findings to clients. Independently own assessment workstreams, develop proof-of-concept exploits, communicate technical conclusions, review team work, and contribute to security research, open-source tools, and technical writing.

Provide tax preparation, planning, and advisory services for individuals and businesses holding bitcoin and digital assets. Prepare and file tax returns, calculate cost basis and gains/losses, advise on mining/staking/airdrop income, collaborate with advisors and estate planners, maintain compliance documentation, and contribute thought leadership through articles and webinars.