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Fun.xyz

Product Engineer

Fun.xyz

. Design and scale SDK software powering Checkout across web2 and web3 environments .

Posted 11/12/2026full-timeNew York City • New York • United StatesMid-LevelSenior💰 $155,000 - $300,000 per yearWebsite

Core Competencies

Role fit
Core Competencies

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Demonstrates expertise in full-stack development with a focus on JavaScript, TypeScript, and modern frameworks like React, while building scalable SDKs for crypto payments. Proven ability to solve complex technical challenges in agile environments and contribute to open-source projects.

Highest-signal resume keywords
Full-Stack DevelopmentJavaScriptTypeScriptReactBlockchain Technologies

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills
SDK DevelopmentHigh-Performance SoftwareBackend APIsAgile MethodologiesOn-Chain Payments
Soft Skills
Attention to DetailProblem-SolvingCollaborationOwnershipPassion for Building
Industry Keywords
Crypto PaymentsEVM-Compatible NetworksOpen-Source ContributionsScalable ToolsUser Experience

Tech Stack

Tools & technologies
JavaScriptReactTypeScriptWeb3

About the role

Key responsibilities & impact
  • Design and scale SDK software powering Checkout across web2 and web3 environments
  • Work across the stack on systems balancing performance, reliability, and user experience
  • Collaborate with protocol, backend, and business teams
  • Solve complex technical challenges
  • Build tools that scale globally for evolving on-chain payment demands
  • Help shape the future of crypto payments

Requirements

What you’ll need
  • 3+ years of engineering experience with JavaScript, TypeScript, and modern frameworks
  • Strong understanding of full-stack development, including React and backend APIs
  • Attention to detail in product design and user interaction
  • Proven track record building scalable, high-performance software
  • Familiarity with blockchain technologies and EVM-compatible networks
  • Comfortable solving difficult technical problems in agile environments
  • Experience working on payments, SDKs, or crypto-related systems
  • Passion for building secure, efficient, and accessible tools
  • Experience contributing to open-source projects or building SDKs/dev tools
  • Experience shipping products from 0 to 1 in a fast-paced setting
  • Ability to thrive in ownership-heavy environments
  • Thoughtful, precise, and rigorous problem-solving approach

Benefits

Comp & perks
  • Primarily in-person at the Midtown, NYC headquarters
  • Monday through Thursday collaborative work schedule
  • Optional work-from-home Fridays
  • Opportunity to shape the future of payments and programmable money
  • Work with bleeding-edge technology
  • Mission-driven team focused on access, openness, and trust
  • Collaborate with protocols, builders, and financial infrastructure providers