Backend Engineer

Fun.xyz

. Design, build, and maintain high-performance APIs and backend services powering the Web3 payments platform .

Posted 11/12/2026full-timeNew York City • New York • United StatesMid-LevelSenior💰 $150,000 - $300,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in designing and maintaining high-performance APIs and backend services, with a strong focus on distributed systems, cloud platforms, and compliance in the Web3 payments domain. Proficient in TypeScript and skilled in debugging complex technical issues while collaborating effectively with cross-functional teams.

Highest-signal resume keywords

TypeScript ProficiencyBackend Systems DevelopmentDistributed Systems UnderstandingCloud Platforms ExperienceProblem-Solving Skills

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

API DesignBackend DevelopmentDatabase DesignData StructuresAlgorithmsIncident ResponseDebuggingLow-Latency SystemsFault ToleranceScalability

Soft Skills

Clear CommunicationCollaboration

Tools & Technologies

Cloud PlatformsContainerization TechnologiesEvent-Driven ArchitecturesReal-Time Data Processing

Industry Keywords

Web3PaymentsBlockchain IntegrationsSmart ContractsDeFi ProtocolsFinancial ComplianceCrypto Startup Experience

Tech Stack

Tools & technologies

CloudDistributed SystemsOpen SourceTypeScriptWeb3

About the role

Key responsibilities & impact

Design, build, and maintain high-performance APIs and backend services powering the Web3 payments platform
Build new features to improve the product experience
Collaborate with product and protocol teams to architect technical solutions meeting business requirements
Write clean, well-tested code and participate in code reviews
Contribute to incident response and debug production issues to ensure system reliability
Architect backend services supporting payments, settlement, and transaction routing across chains and payment providers
Develop high-performance, low-latency systems for asset conversion, identity and security verification, transaction finality, and decentralized routing
Ensure fault tolerance, scalability, and compliance across a global user base

Requirements

What you’ll need

Strong experience building production backend systems with modern languages
Proficiency in TypeScript
Deep understanding of distributed systems, APIs, and database design principles
Hands-on experience with cloud platforms and containerization technologies
Solid grasp of computer science fundamentals, including data structures and algorithms
Strong problem-solving skills with ability to debug complex technical issues
Clear communicator who can collaborate effectively with cross-functional teams
Nice to have: Previously worked at a crypto startup or Web3 infrastructure company
Nice to have: Experience with blockchain integrations, smart contracts, or DeFi protocols
Nice to have: Background with high-scale payment processing or financial compliance systems
Nice to have: Contributions to open source projects or technical writing
Nice to have: Experience with event-driven architectures and real-time data processing

Benefits

Comp & perks

Primarily in-person at the Midtown, NYC headquarters Monday through Thursday
Optional WFH 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
Key contributor role with work that ships fast and matters
Collaboration with top-tier protocols, builders, and financial infrastructure providers