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SoFi interview notes, page 1 of 7

Large Enterprises

Most of these SoFi write-ups come from Software Engineers (52), then Frontend Engineers (5) and Data Scientists (4). The most reported rounds are the technical phone screen (37), the system design round (11), the behavioral / leadership round (9) and the hiring manager screen (3).

61 interview notes · updated Jul 2026

SoFi·Software Engineer·Technical Phone Screen

Apr 2026
Went through a technical phone screen for a full-stack role at SoFi and got a classic backtracking problem. Nothing too exotic, but it went deeper than I expected once the complexity discussion started.
  • Given an array of distinct integers, return all possible permutations.

“I knew it was backtracking pretty fast, which was a relief.”

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SoFi·Software Engineer·Technical Phone Screen

Apr 2026
SoFi full-stack interview with a Java OOP design question that had more moving parts than I expected. The grader was automated and checked output formatting exactly, which tripped me up more than the actual logic did.
  • Design and implement an abstract base class in Java called Account with methods for getting balance, calculating interest over a period, depositing, and withdrawing. Then implement two concrete subclasses: one for a savings account with fixed monthly interest and overdraft protection, and one for a checking account with no interest but a configurable overdraft limit.
  • Follow-up: why did you choose an abstract class over an interface here, and when would you make the opposite choice?
  • Follow-up: what's the difference between overriding and overloading a method, and how did that apply to your withdraw implementation?
  • Follow-up: explain the visibility modifiers you used and why.

“The skeleton felt manageable until I realized the grader was checking string output character by character.”

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SoFi·Software Engineer·Onsite - Behavioral / Leadership

Apr 2026
Behavioral round at SoFi for a software engineer role. Just the one question shared, but it was a meaty one that made me think harder than I expected.
  • Tell me about a time you had to solve a technical problem that was outside your normal area of responsibility. How did you recognize it was on you to handle it, and what was the outcome?

“This tripped me up a bit because the hardest part isn't the story itself, it's convincing them you actually owned it and didn't just tag along.”

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SoFi·Software Engineer·Technical Phone Screen

Apr 2026
SoFi full-stack screen, one coding problem the whole time. They wanted pure vanilla JS, no libraries, which honestly tripped me up a bit since I've been living in React land for years.
  • Using only vanilla JavaScript (no frameworks or libraries), implement a 'Load More' button that fetches data from an endpoint on each click and appends the results to the page. Include loading state management, basic error handling, and optionally stop loading when the server signals there's no more data.

“My first instinct was to reach for fetch inside an async function and I did that fine, but I fumbled the button disable logic.”

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SoFi·Frontend Engineer·Onsite - System Design / Architecture

Apr 2026
System design round at SoFi for a frontend engineer role, focused entirely on building a notification system in a SPA. No backend stuff, just the frontend layer, which was actually a nice constraint for once.
  • Design the frontend for an in-app notification system in a single-page application built on a shared component library. Cover the component API and props, the data model, state management, real-time updates, debouncing, and cross-tab sync. Frontend only.

“This was the whole interview, one big question.”

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SoFi·Software Engineer·Onsite - Behavioral / Leadership

Apr 2026
Behavioral round at SoFi for a software engineer role. Just the one question worth noting here, but it was a meaty one that took me a minute to find a good example for.
  • Tell me about a time you pushed for the end user's needs even though it meant giving up a technically cleaner solution.

“I fumbled around for a story at first because most of my examples were either too technical or didn't really show user advocacy in a clear way.”

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SoFi·Software Engineer·Technical Phone Screen

Apr 2026
SoFi full-stack screen that was basically a pure frontend CSS exercise. No JS allowed, which I wasn't expecting going in.
  • Build a search bar component using only HTML and CSS. It needs a text input, a submit button, decent layout and spacing, focus and hover states, and should work across browsers. No JavaScript.

“The no-JS constraint was the whole point and I almost glossed over it.”

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SoFi·Frontend Engineer·Technical Phone Screen

Apr 2026
SoFi frontend interview that was basically one big component-design problem. They wanted a lazy-loaded paginated list and then kept poking at the edges until I ran out of confident answers.
  • Build a lazy-loaded list component that fetches paginated data in batches of 10 items, appending results as the user scrolls or clicks 'load more'.
  • How would you handle loading state, end-of-list detection, and error recovery with a retry mechanism in this component?
  • Walk through how you'd debounce scroll events and deduplicate in-flight requests to avoid redundant API calls.

“I started with the scroll listener approach and it felt fine until they asked how I'd prevent firing 40 requests per second while someone drags the scrollbar.”

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SoFi·Software Engineer·Technical Phone Screen

Apr 2026
Technical phone screen for a Software Engineer role at SoFi covering Java internals and design fundamentals. Three questions, all fairly standard backend territory, but they went deeper than I expected on the GC one.
  • Can you explain how Java garbage collection works at a high level, including generational collection, marking, and compaction? What signals would you look for when diagnosing or tuning GC behavior?
  • What is the Singleton pattern, when would you actually use it, and how do you implement it safely in Java considering thread safety and lazy versus eager initialization?
  • Walk me through the core OOP and SOLID principles you apply in your day-to-day design work and how they affect maintainability or extensibility.

“This went longer than I thought it would.”

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SoFi·Software Engineer·Onsite - System Design / Architecture

Apr 2026
SoFi software engineer round that was basically one big frontend system design question. More depth than I expected for what I thought would be a standard coding screen.
  • Build a React data table with full CRUD support, pagination, sorting, inline editing, form validation, optimistic updates, and error handling. Walk through your state management approach, component structure, accessibility, and performance considerations like virtualization and memoization.

“This was a lot.”

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