Fullstack Engineer, App Platform

Whatnot
San Francisco, Seattle, New York, Los Angeles
Workplace: RemoteFull timeUSD 207,000 - 230,000 annuallyFunction: Software EngineeringExperience: 5+ yearsEducation: bachelorsSkills: ["Product instincts","Mentorship","Problem-solving","Autonomy","Ownership","Craftsmanship","Continuous improvement","Curiosity"]

Build the infrastructure for Whatnot’s App Platform—the shared foundation that powers iOS, Android, and Web. You’ll scale Web backend services, improve networking and persistence layers, strengthen the client testing harness, and drive app stability and crash reduction. Partner with product teams to make the “right way” to build also the easiest way, owning platform work that compounds across the entire app.

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Whatnot
Whatnot
2 days ago

Fullstack Engineer, App Platform

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Source: Company careers pageValidated by: Fursa AI
Last checked: 26 minutes agoStatus: Live

Job Summary

Build the infrastructure for Whatnot’s App Platform—the shared foundation that powers iOS, Android, and Web. You’ll scale Web backend services, improve networking and persistence layers, strengthen the client testing harness, and drive app stability and crash reduction. Partner with product teams to make the “right way” to build also the easiest way, owning platform work that compounds across the entire app.
Location: San Francisco, Seattle, New York, Los Angeles
Workplace: Remote
Employment Type: Full time
Job Function: Software Engineering
Seniority: Mid level

Key Responsibilities

  • •Scale Whatnot’s Web backend services and strengthen networking and persistence layers.
  • •Improve client testing harnesses to support reliable platform delivery.
  • •Drive app stability and reduce crashes by partnering with product teams.
  • •Own platform reliability and production health, including incident response and continuous improvement.
  • •Contribute to shared architecture components (e.g., design system, localization, core components) used across product pods.

Pay and Benefits

Salary: USD 207,000 - 230,000 annually
Perks:Health InsuranceDentalVisionRemote WorkHome Office401kParental LeaveChildcareWellness StipendPensionCell PhoneInternet Allowance

Key Requirements

  • •5+ years of software development and a Bachelor’s degree in Computer Science (or related field) or equivalent work experience.
  • •Web development experience with React, using GraphQL for API development, and modern frontend applications (Next.js exposure preferred).
  • •Backend experience building end-to-end high-scale product experiences as a fullstack engineer, with Node or Python and/or Postgres experience.
  • •Strong product instincts and a commitment to high-quality end-user experiences while maintaining systems at scale.
  • •Ability to mentor others and contribute to production health, incident response, and continuous improvement of platform reliability.
Experience:5+ years
Education:Bachelor's in Computer Science
Skills:Product instinctsMentorshipProblem-solvingAutonomyOwnershipCraftsmanshipContinuous improvementCuriosity
Tech Stack:ReactGraphQLNext.jsNodePythonPostgresIOSAndroidWeb

Company Brief

Whatnot
Whatnot is a live-stream shopping marketplace connecting sellers and collectors for trading cards, toys, and collectibles. The platform hosts live auctions and interactive streams, enabling creators and small businesses to sell directly to engaged communities.
Industry: Online Marketplaces
Company Size: Large (251 to 1,000 employees)
Growth: Scaleup
Valuation: Unicorn (USD 1B+)
Funding: Series D
Headquarters: United States
Founded: 2019
WebsiteLinkedIn