Type · Data Structure
Implement a data structure that supports adding a user session (user_id, start_time, end_time) and efficiently querying the maximum number of concurrent sessions at any given point in time.
How to Pass the Telli Software Engineer Interview in 2026
The Telli DNA (TL;DR)
Telli's 'Case Study Case Study' round is key, assessing how candidates would directly improve "Phone Calls That Convert" and "Sales Agent" efficiency. They seek practical application of strategies, discussing how one would leverage "Auto Dialer Product Resources" to achieve concrete results in customer engagement and conversion.
The Telli Interview Loop
Your onsite loop will typically consist of 5 rounds.
- 1
Round 1
Recruiter ScreenMotivation, role fit, logistics. - 2
Round 2
Coding ScreenLeetCode-medium algorithmic problems under time pressure. - 3
Round 3
System DesignDistributed systems, trade-offs at scale, architecture under constraints. - 4
Round 4
Onsite CodingLeetCode-hard, debugging, code clarity, edge cases. - 5
Round 5
Behavioral / LeadershipPast evidence of ownership, influence, resolving conflict.
The Danger Zone: Top Reasons Candidates Fail
Based on our database of Telli interview outcomes, avoid these common traps:
- Not considering caching strategies for frequently accessed user data.
- Failing to explain the strategy used to influence the resistant party.
- Handling of edge cases like empty event lists or invalid date ranges.
- Not demonstrating empathy or understanding for the other person's perspective.
Test Yourself: Real Telli Questions
Three real prompts pulled from our database.
Type · Algorithm
You are given a list of feature flags, each with an ID, a rollout percentage, and a list of user IDs it applies to. Design an algorithm to determine which feature flags a specific user should see, considering both the percentage rollout and specific user inclusions.
Type · Motivation
What interests you about working at Telli, and how do you see your skills contributing to our mission of simplifying SaaS growth for businesses?
+ many more questions, signals, and worked examples
Sign up to unlock the full Telli grading rubric
Telli Interview Question Bank
A sample from our database, grouped by round. Sign up to see the full set.
9 of 19 questions shown
1
Recruiter Screen
1- 1
Type · Motivation
What interests you about working at Telli, and how do you see your skills contributing to our mission of simplifying SaaS growth for businesses?
2
Coding Screen
3- 2
Type · Algorithm
Given a list of user events (timestamp, user_id, event_type), write a function to calculate the daily active users (DAU) for a given date range. Assume events are sorted by timestamp. - 3
Type · Data Structure
Implement a data structure that supports adding a user session (user_id, start_time, end_time) and efficiently querying the maximum number of concurrent sessions at any given point in time. - + 1 more questions in this round (sign up to unlock)
3
System Design
3- 4
Type · API Design
Design the API for Telli's core analytics service. Consider endpoints for ingesting event data, retrieving aggregated metrics (e.g., conversion rates, user counts), and managing user segments. Discuss data formats, authentication, and rate limiting. - 5
Type · Data Pipeline
Design a scalable data pipeline to process millions of user events daily, transform them into meaningful metrics, and store them for reporting. Discuss choices for message queues, stream processing, and data warehousing. - + 1 more questions in this round (sign up to unlock)
4
Onsite Coding
3- 6
Type · Algorithm
Write a function to find the k-th most frequent element in a list of user IDs. Handle ties arbitrarily. - 7
Type · Debugging
A user reports that their dashboard metrics are sometimes incorrect, showing zero conversions when they expect a positive number. The backend logs show events are being received. Debug this issue, assuming the event processing logic might have a subtle bug. - + 1 more questions in this round (sign up to unlock)
5
Behavioral / Leadership
9- 8
Type · Past Experience
Tell me about a time you had to influence a senior stakeholder or a cross-functional team to adopt your product vision or strategy, even when they initially disagreed. - 9
Type · Conflict Resolution
Tell me about a time you had a significant disagreement with an engineer or designer about a product decision. How did you resolve it? - + 7 more questions in this round (sign up to unlock)
Unlock all 19 Telli questions, free
No credit card. Every question with its framework, the grading signals interviewers score against, and a worked answer for each.
Interview tracks at Telli
How Telli's DNA translates across functions. Pick your role.
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Practice Telli interviews end-to-end
Telli Mock Interview
Run a live mock interview with our AI interviewer using Telli-style prompts. Get scored on structure, signal, and answer length - exactly how the real loop grades you.
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STAR Stories for Telli Behavioral Rounds
Build a Story Bank of your past wins, mapped to the leadership signals Telli interviewers grade on. Reuse them across every behavioral round.
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Telli Interview Prep Hub
The frameworks behind every Telli round: CIRCLES for product sense, hypothesis-driven debugging for analytical, STAR for behavioral. Learn each one in 10 minutes.
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Interview Frameworks
CIRCLES, STAR, AARRR, RICE, MECE. The exact frameworks that make Telli interviewers nod instead of frown. Step-by-step playbooks with the moves and the pitfalls.
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Sample answers
What a strong answer to these Telli interview questions shows.
Implement a data structure that supports adding a user session (user_id, start_time, end_time) and efficiently querying the maximum number of concurrent sessions at any given point in time.
A strong answer shows: Correctness of concurrency calculation.; Efficiency of adding sessions and querying max concurrency.; Understanding of sweep-line or similar techniques..
You are given a list of feature flags, each with an ID, a rollout percentage, and a list of user IDs it applies to. Design an algorithm to determine which feature flags a specific user should see, considering both the percentage rollout and specific user inclusions.
A strong answer shows: Correct implementation of percentage-based rollouts.; Handling of explicit user inclusions.; Scalability for many users and flags..
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