Web3 JavaScript Jobs in United States, North America

About the Job

Zero Hash is looking for a Staff Software Engineer to architect and build our open banking data aggregation platform, scaling our gateway to Finance 2.0. We are a high-performing team looking for an equally ambitious and driven teammate. The right candidate for this position is detail-oriented, deeply technical, and driven by the challenges of complex systems and browser internals.

Because many traditional banking APIs are not public, this role is critical to our infrastructure. You will be responsible for building a distributed, client-side automation engine. Rather than relying on traditional server-side scraping, you will build secure, agent-based infrastructure (e.g., Chrome Manifest V3 extensions, iOS WKWebViews) that communicates with our centralized backend via persistent WebSockets. You will tackle complex technical challenges, applying strong security fundamentals to navigate strict execution environments, intercept network traffic securely, and transform unstructured web data into programmable APIs that bridge traditional finance and digital assets.

Responsibilities

• Architect and build the core automation runtime, focusing on resilient UI interactions, reliable programmatic data entry, and robust session routing.
• Design and implement secure network interception layers to seamlessly capture and parse underlying financial data streams without relying solely on fragile UI elements.
• Build and maintain high-performance communication protocols that connect our distributed client-side agents to a centralized backend routing hub.
• Develop elegant solutions to navigate complex, multi-step authentication flows—such as MFA and Passkeys—by seamlessly bridging background automation with user-facing interactive prompts.
• Navigate and engineer around the strict execution boundaries, security sandboxes, and ephemeral lifecycles inherent in modern browser and mobile webview environments.
• Build resiliency and scalability into the platform at every step, adapting quickly to dynamic DOM changes, varying mobile/desktop portal structures, and application suspension states.
• Introduce industry-leading engineering patterns and practices that give us the confidence to operate at scale.
• Support the engineering team in achieving a high level of technical excellence, actively mentoring senior and mid-level engineers.

Requirements

• 10+ years of hands-on software engineering experience, deeply focused on advanced web automation, browser internals, extension development, or complex frontend-to-backend data extraction.
• Deep proficiency in TypeScript and JavaScript, specifically regarding deep DOM manipulation, modern web APIs, and strict browser execution environments.
• Strong backend experience, ideally with Golang (or Node.js/Python), to design the centralized WebSocket routing hubs and operational infrastructure.
• Strong security fundamentals: you deeply understand secure message passing across trust boundaries (JS bridges, isolated vs. main worlds), secure authentication handshakes, and mitigating DOM-based injection risks.
• Expertise in analyzing complex network architectures and single-page applications (SPAs) to establish resilient data ingestion pipelines without relying on brittle UI selectors.
• Experience with distributed systems, specifically managing persistent connections and stateful, multi-hop sessions across ephemeral client runtimes.
• Comfort with ambiguity; the ability to independently lay out and test clear hypotheses and solve problems without well-defined direction.

Preferred Qualifications

• BS or MS degree in Computer Science or Engineering OR equivalent years of work experience.
• Proven track record of developing production-grade browser extensions (Chrome MV3) or integrating complex web automation within mobile native environments (iOS WKWebView, Android WebView).
• Strong understanding of WebAuthn / Passkey protocols and how to integrate them into automated flows.
• Previous engineering experience at a major financial data aggregator or building zero-knowledge/client-side data extraction tools.
• Understanding of cryptocurrency and blockchain technology, including major protocols, on-chain transaction flows, and common crypto security practices.

Benefits

• Healthcare Insurance: zerohash covers roughly 100% of employee premiums as well as a portion of spouse/children (U.S. only)
• Vision & Dental Insurance (U.S. only)
• Chance to earn equity
• Maternity & Paternity leave (after 6 months)
• WeWork All Access Membership
• WFH Yearly Stipend
• L&D Yearly Stipend (after 6 months)

About Zero Hash

Zero Hash is the leading crypto and stablecoin infrastructure platform and the operating system for digital money, powering the next generation of financial services. Founded in 2017, Zero Hash enables banks, brokerages, fintechs, and payment companies to offer crypto trading, stablecoin payments, and tokenized assets without having to build or manage complex blockchain infrastructure on their own.

The Zero Hash platform supports three core pillars: Trade, Transact, and Tokenize. Through a single integration, customers can launch regulated crypto buy, sell, and custody services; enable 24/7 stablecoin-based funding, payouts, and settlement; and issue and manage tokenized assets with built-in compliance, risk controls, and reporting. By abstracting away technical, regulatory, and operational complexity, Zero Hash allows partners to treat digital assets as just another financial primitive: fast, programmable, and global

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For candidates based in Colorado, please contact colorado-wages @zerohash.com to request compensation and benefits information regarding a particular role(s). Please include with your email the city you reside (or intend to reside in Colorado) and the title/link to the roles you're interested in.

**We’ve recently seen an increase in individuals impersonating zerohash recruiters to target job seekers. Please stay vigilant and keep the following in mind to ensure you are communicating with the real zerohash team:

• Verified Emails Only: Official outreach will only come from a @zerohash.com email address.
• No Messaging Apps: We will never contact you via unsolicited text messages, WhatsApp, or Telegram.
• Official Applications: Only apply directly through our careers webpage (zerohash.com/careers) or zero-hash.breezy.hr.

See something suspicious?If you want to verify an interview request or report a fake job posting or suspicious communication, please contact us immediately at talent @zerohash.com.