Fullstack Engineer, App Platform

Whatnot•San Francisco, CA

7d•$207,000 - $230,000•Hybrid

About The Position

App Platform is Whatnot's client infrastructure team, building the consistent, reliable foundation that every product team builds on top of across iOS, Android, and Web. Rather than owning a single feature surface, the team pushes technical boundaries so product pods can move fast without sacrificing quality — owning things like app stability and observability, the Whatnot Design System, localization, core components, and the shared architecture that keeps our apps performant and consistent at scale. As an Fullstack Engineer on App Platform, you'll focus on the infrastructure and building blocks that feature teams rely on: scaling our Web backend services, strengthening our networking and persistence layers, improving our client testing harnesses, driving app stability and crash reduction, and partnering closely with product teams to make sure the "right way" to build is also the easiest way. It's a high-leverage role for someone who wants their work to compound across the entire app rather than a single feature. 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, Seattle, San Francisco or Los Angeles hub. This is a strong fit for an engineer who enjoys shipping product-facing platform work, cares deeply about user trust and message quality, and is excited by the challenge of building systems used by many teams across the company. 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 or Seattle hub.

Requirements

5+ years of software development
Bachelor’s degree in Computer Science, a related field, or equivalent work experience
Web development experience with React
Using GraphQL for API development
Experience with modern frontend applications
Backend expertise: Proven track record of building end-to-end high-scale product experiences as a fullstack engineer
Excellent product instincts—you first think about users rather than the best technical solution
Care deeply about the craft of software engineering, maintaining systems at scale, and how to balance the productivity and velocity of teams while maintaining a high quality end-user experience
Strong ownership instincts
An excellent problem solver

Nice To Haves

Exposure to Next.js framework
Experience with Node or Python on backend
Experience with Postgres databases

Responsibilities

Scaling our Web backend services
Strengthening our networking and persistence layers
Improving our client testing harnesses
Driving app stability and crash reduction
Partnering closely with product teams to make sure the "right way" to build is also the easiest way
Mentoring others
Prioritizing building inclusive, supportive teams
Contributing to team-wide ownership of production health, incident response, and continuous improvement of platform reliability
Owning projects from inception to production and beyond
Shipping products and features lightning-fast
Operating autonomously
Picking up on new technologies very quickly
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
16 weeks of paid parental leave + one month gradual return to work company leave allowances run concurrently with country leave requirements which take precedence.