Upstox SDE-2 (Frontend) Interview Experience — July 2025

Overview

Upstox is a fast-paced fintech company that builds digital investment and trading products. The SDE-2 Frontend interview process assessed the candidate's ability to solve data structures and algorithms problems, build React-based functionality, reason about frontend system design, and communicate with hiring stakeholders.

Interview Process

The interview process consisted of four stages:

1. Online Assessment — HackerRank Test
2. Technical Round 1 — DSA and Problem Solving
3. Technical Round 2 — Frontend System Design and React
4. Hiring Manager and HR Discussions

The online assessment took place on 2 July 2025 and included two questions covering DSA and React problem solving.

Technical Rounds

Round 1: HackerRank Online Assessment

The HackerRank assessment contained two questions:

DSA: Longest Ones or Maximum Consecutive Ones

The candidate was given a standard binary-array problem involving the maximum number of consecutive ones. Depending on the exact constraints, the problem could also require flipping a limited number of zeroes. This question evaluated array traversal, sliding-window reasoning, and the ability to manage constraints efficiently.

React: Stock Buy and Sell Component

The React problem involved simulating a small trading application. The candidate was expected to build buy and sell controls, track transactions, and display the final profit in a separate component. The question assessed practical React skills, including state management, component communication, event handling, and the organisation of related UI logic.

Round 2: DSA and Problem Solving

The second stage focused on data structures and algorithms. The candidate was evaluated on problem-solving ability, logical reasoning, and the capacity to explain an efficient approach clearly. Candidates preparing for a similar SDE-2 Frontend interview should expect discussions around algorithm selection, complexity analysis, edge cases, and implementation details.

Round 3: Frontend System Design and React

The third stage combined frontend system design with React-focused discussions. The system design portion evaluated how the candidate would structure a scalable frontend application, while the React discussion examined the candidate's understanding of component design and application behaviour.

For a fintech product, relevant design considerations may include clear separation of UI and business logic, predictable state management, reusable components, reliable transaction-related interactions, and a responsive user experience. The available interview account does not provide the complete list of questions from this round.