Senior Full-Stack Software Engineer

Who you are

• Built social or engagement systems at scale with feeds, referral flows, notification infrastructure, social graphs, or real-time interactions at a gaming or consumer social company
• Owned a feature end-to-end across the full stack: you designed the data model, wrote the API, shipped the client, and monitored it in production
• Shipped production features across more than one client platform (iOS, Android, or Web) - you have depth in at least one and have demonstrated you can build in the others with ramp-up time and modern tooling
• Instrumented a growth or engagement feature with analytics events and used the data to drive meaningful iteration
• Worked in a fast-moving, low-process environment where you drove your own work without waiting to be told what to build next
• Used AI-assisted development tools (Claude, Copilot, or similar code-generation tools) as genuine accelerators - you see them as force multipliers, and have a clear point of view on how to use them well
• Written production code or had exposure in two or more of the following technologies: Swift, Kotlin, React Native, Typescript, Dart, or Python that served millions of users
• Built something - a side project, an open source tool, a game mechanic - because you wanted to, not because someone asked you to

What the job involves

• As a Senior Full-Stack Engineer on this team, you’ll build the systems and features that power Acorns’ organic growth engine. Social graphs, engagement loops, referral mechanics, real-time interactions, sharing flows, the infrastructure that makes a product spread.
• You’ll own your features end-to-end: API design, server logic, implementation, instrumentation, and iteration. You’ll work directly with the CEO, a Senior Product Manager and a Senior Product Designer
• This is end-to-end ownership from early concept through shipped product on features where what you build will reach millions of people who are often investing for the first time
• Build the mechanics that make a product spread including referral systems, social sharing flows, engagement loops, and real-time features that drive Acorns’ organic growth
• Own features end-to-end from data model to shipped customer experience, across mobile and web, with full accountability for quality and performance in production
• Deliver features end-to-end across iOS, Android, Web, and backend services, moving fluidly between platforms depending on what each initiative requires, and leveraging AI-assisted development tools to accelerate work in less-familiar codebases
• Instrument your work properly: define the events, build the visibility, and use data to iterate fast
• Take full ownership of the technical bar and architecture, while upholding engineering standards, where your decisions have outsized impact and every voice counts
• Partner directly with the CEO, a Senior PM, and a Senior Designer in a tight, high-trust team that moves fast and ships things people actually use

Benefits

• Healthcare - Medical, Dental, Vision, Life, and more
• 401k
• Equity
• Flexible Paid Time Off
• Unlimited Udemy classes
• Monthly wellness hour and virtual yoga classes
• Flexible Work Hours
• Quarterly Team Outings
• Personal Development Plans
• Annual Compensation Reviews
• Recognition - Using a tool called Reflektive, we like to give shout-outs to teammates who raise the bar
• Bi-Weekly 1:1s
• MacBooks
• Commuter Benefits
• Flexible Work Options