TrueFoundry - SSE - Selected Feb 2026

R1:

1. Given a series of words written using a scrambled alphabet, return whether the list of strings is lexicographically sorted in ascending order. A list of n words is given, the alphabet order is provided as a sorted array of characters. Input: carry of strings, so cat, bat, tab. Alphabets, array of characters, C, B, A, T. The output should be true or false.
2. Design a VersionedArray as below: VersionedArray gets in length initializes the array of provided length with the default value set to zero. Int saveVersion saves the current state of the array and returns a version number starting from one. Void update int index int value updates the element at the given index with the specified value. Int getValue int index int versionNumber retrieves the value at the specified index from the saved version. Sample inputs would be like VersionedArray of 3, update 0 comma 5, saveVersion, so it is 1, update 0 comma 6, getValue of 0 comma 1, which is 5.

R2: Attached below

R3: Onsite - Design Uber - with co-founder

R4: Onsite - Behavioural with a chief: Saas product that I liked the most, what improvements that I would make, if I'm a senior product manager, how will I behave, conflict management, what energy do you bring at work that everyone think of you, weakness, why truefoundry, etc.

R2 question: Define the database schema and write the code for the three APIs: Database Schema: Tables:

1. Interviewers - InterviewerID (Primary Key) - Name - Email - TimeZone
2. Availability - AvailabilityID (Primary Key) - InterviewerID (Foreign Key to Interviewers) - StartTime - EndTime
3. Interviews - InterviewID (Primary Key) - CandidateName - InterviewerID (Foreign Key to Interviewers) - InterviewTime

API 1: MarkSlots Description: This API allows interviewers to mark their free hours when they can conduct interviews. Request: json { "interviewer_id": "123", "slots": [ {"start_time": "2023-10-01T11:00:00", "end_time": "2023-10-01T14:00:00"}, {"start_time": "2023-10-02T17:00:00", "end_time": "2023-10-02T20:00:00"} ] } Response: json { "success": true, "message": "Slots marked successfully." }

API 2: GetAvailableSlots Description: This API provides candidates with a list of all available time slots for interviews within the next 14 days. Request: json { "candidate_name": "John Doe" } Response: json { "available_slots": [ {"interviewer_id": "123", "interviewer_name": "Alice", "start_time": "2023-10-01T11:00:00", "end_time": "2023-10-01T12:00:00"}, {"interviewer_id": "456", "interviewer_name": "Bob", "start_time": "2023-10-01T11:00:00", "end_time": "2023-10-01T12:00:00"} ] }

API 3: BookInterview Description: This API allows candidates to book an interview by selecting a time slot. The system will automatically assign an available interviewer. Request: json { "candidate_name": "John Doe", "selected_slot": {"start_time": "2023-10-01T11:00:00", "end_time": "2023-10-01T12:00:00"} } Response: json { "success": true, "message": "Interview booked successfully.", "interviewer_id": "123", "interviewer_name": "Alice" }