Fullstack Engineer, Ads

Whatnot

$130K — $155K *
Consumer Technology
5 - 7 years of experience
Job Overview by Ladders

Qualifications

  • 5+ years of generalist software development experience.
  • Bachelor's degree in Computer Science or equivalent work experience.
  • Full-stack proficiency across mobile, web, and backend systems.
  • Experience with React and GraphQL; preferred exposure to Next.js.
  • Proven track record of building high-scale product experiences.
  • Strong product instincts, focusing on user needs over technical solutions.
  • Ability to mentor others and foster an inclusive team environment.

Responsibilities

  • Own and lead major functionalities within the ads system.
  • Develop and maintain backend systems and data retrieval processes.
  • Implement and optimize frontend applications using React.
  • Collaborate with cross-functional teams including Data Platform and Machine Learning.
  • Drive projects from inception to production, ensuring high-quality outcomes.
  • Quickly adapt to new technologies and deliver features efficiently.
  • Participate in 'dogfooding' to enhance user experience as a buyer and seller.

Benefits

  • Generous Holiday and Time off Policy.
  • Health Insurance options including Medical, Dental, Vision.
  • Support for remote work, including home office setup and allowances.
  • Care benefits, including wellness and childcare allowances.
  • 401k retirement plan with employer match and international pension options.
  • Monthly allowance for engaging with the app as both buyer and seller.
  • 16 weeks of paid parental leave plus a gradual return to work.
Full Job Description
Role

Ads at Whatnot are both a growth lever for sellers and a revenue lever for Whatnot; When ads work, they earn seller trust by delivering real, incremental value - new buyers, new-to-category reach, and viewership that compounds. The team owns the end-to-end ads system: backend foundations, retrieval and ranking, UI and dashboards, logging, measurement, and more. The team is small- we expect engineers to be ready to own and lead major pieces of functionality independently. We work closely across the rest of the engineering org, including Discovery, Seller Growth, Data Platform, Machine Learning Platform, and Payments

We9re hiring across the full ads stack - from engineers who go deep on backend systems and data to engineers who move fluidly across the stack into client and seller-facing surfaces. In either case, you9ll own problems end to end and grow into new areas as the team scales.

We offer flexibility to work from home or from one of our global office hubs, and we value in-person time for planning, problem-solving, and connection. Team members in this role must live within commuting distance of our New York hub.
You

People who do well at Whatnot tend to be comfortable figuring things out as they go, biased toward action, and genuinely curious about what they9re building. They care more about outcomes than credit and stay close to the product and the people using it.

As our next Fullstack Engineer you should have 5+ years of generalist software development plus:
  • Bachelor9s degree in Computer Science, a related field, or equivalent work experience.
  • Full-stack proficiency: You are comfortable working across the entire stack, from mobile (iOS/Android) and web to backend systems.
  • Web development experience with React, using GraphQL for API development, and modern frontend applications (exposure to Next.js framework is not required but preferred).
  • Backend Expertise: Proven track record of building end-to-end high-scale product experiences as a full-stack engineer. Experience with Python on backend, and/or Postgres databases is a plus.
  • Excellent product instincts- you first think about users rather than the best technical solution.
  • You can mentor others, and prioritize building inclusive, supportive teams.
  • Project owner- you9ve strong ownership instincts and can own projects from inception to production and beyond.
  • You are known for shipping products and features lightning-fast.
  • You9re an excellent problem solver and can operate autonomously.
  • Ability to pick up on new technologies very quickly.
  • Proven track record of delivering features
Benefits
  • Generous Holiday and Time off Policy
  • Health Insurance options including Medical, Dental, Vision
  • Work From Home Support
    • Home office setup allowance
    • Monthly allowance for cell phone and internet
  • Care benefits
    • Monthly allowance for wellness
    • Annual allowance towards Childcare
    • Lifetime benefit for family planning, such as adoption or fertility expenses
  • Retirement; 401k offering for Traditional and Roth accounts in the US (employer match up to 4% of base salary) and Pension plans internationally
  • Monthly allowance to dogfood the app
    • All Whatnauts are expected to develop a deep understanding of our product. We9re passionate about building the best user experience, and all employees are expected to use Whatnot as both a buyer and a seller as part of their job (our dogfooding budget makes this fun and easy!).
  • Parental Leave
    • 16 weeks of paid parental leave + one month gradual return to work *company leave allowances run concurrently with country leave requirements which take precedence.

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