Type · real-time-systems
How would you architect a live activity feed that broadcasts completed workouts to followers in real time while minimizing mobile battery consumption and network bandwidth?
How to Pass the Hevy Software Engineer Interview in 2026
Growth · Software Engineer Interview Guide
Sign up to see ATSHeadquartered in SpainInterview language: English
The Hevy DNA (TL;DR)
Guillem Ros Co-founded Hevy around a tight mobile user loop, so interviews target engineers and product builders who optimize offline-first sync for the Workout Tracker. Evaluation centers on execution speed and minimizing friction in the core Planner Gym Log App experience.
The Hevy Interview Loop
Your onsite loop will typically consist of 4 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 problems, reasoning about defects, code clarity, edge cases.
The Danger Zone: Top Reasons Candidates Fail
Based on our database of Hevy interview outcomes, avoid these common traps:
- Treating offline capability as an afterthought added on top of REST calls
- Re-scanning historical logs on every lookup leading to O(N) query time
- Attempting to compute overlap without sorting intervals first
- Re-summing all K items on every update resulting in O(K) time per insertion
Test Yourself: Real Hevy Questions
Three real prompts pulled from our database.
Type · algorithms
Given a sequence of recorded rest intervals during a workout with start and end timestamps that may overlap due to supersets, detail how you would merge overlapping intervals to calculate the total unique rest time.
Type · data-compression
Walk through how you would design a delta encoding scheme to compress structured numerical workout data (exercise IDs, reps, weight deltas) before saving to local disk or transmitting over low-bandwidth networks.
+ many more questions, signals, and worked examples
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Hevy Interview Question Bank
A sample from our database, grouped by round. Sign up to see the full set.
7 of 15 questions shown
1
Recruiter Screen
1- 1
Type · background-fit
What draws you to mobile software engineering for consumer workout applications, and how do you approach building software where offline resilience is treated as a primary requirement rather than an edge case?
2
Coding Screen
4- 2
Type · algorithms
Describe an algorithm to calculate a user's current active workout streak given an unsorted sequence of workout completion timestamps, handling multiple workouts on the same day and missing days efficiently in O(N) time. - 3
Type · data-structures
How would you design an in-memory data structure that supports recording individual set weight and rep values during an active workout session while allowing O(1) lookup of maximum weight lifted per exercise across all historical sets? - + 2 more questions in this round (sign up to unlock)
3
System Design
5- 4
Type · distributed-systems
Design an offline-first mobile synchronization architecture for a gym logging application that allows users to record and edit workouts without network connectivity and seamlessly reconcile state when reconnecting. - 5
Type · conflict-resolution
How would you design a data synchronization mechanism to resolve concurrent edits when a user modifies the same workout routine on two separate offline mobile devices before syncing back to the cloud? - + 3 more questions in this round (sign up to unlock)
4
Onsite Coding
5- 6
Type · data-compression
Walk through how you would design a delta encoding scheme to compress structured numerical workout data (exercise IDs, reps, weight deltas) before saving to local disk or transmitting over low-bandwidth networks. - 7
Type · string-search
Describe how you would implement a fast, memory-efficient in-memory fuzzy search engine for an exercise library containing thousands of exercises, handling minor typos and prefix matching on mobile hardware. - + 3 more questions in this round (sign up to unlock)
Unlock all 15 Hevy 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 Hevy
How Hevy's DNA translates across functions. Pick your role.
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Practice Hevy interviews end-to-end
Hevy Mock Interview
Run a live mock interview with our AI interviewer using Hevy-style prompts. Get scored on structure, signal, and answer length - exactly how the real loop grades you.
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STAR Stories for Hevy Behavioral Rounds
Build a Story Bank of your past wins, mapped to the leadership signals Hevy interviewers grade on. Reuse them across every behavioral round.
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Hevy Interview Prep Hub
The frameworks behind every Hevy 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 Hevy 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 Hevy interview questions shows.
How would you architect a live activity feed that broadcasts completed workouts to followers in real time while minimizing mobile battery consumption and network bandwidth?
A strong answer shows: Balances real-time delivery requirements against mobile device power and data constraints; Utilizes fan-out strategies tailored to follower counts.
Given a sequence of recorded rest intervals during a workout with start and end timestamps that may overlap due to supersets, detail how you would merge overlapping intervals to calculate the total unique rest time.
A strong answer shows: Recognizes interval merging pattern and sorts intervals in O(N log N); Correctly updates boundary variables without off-by-one errors.
Frequently asked questions
How long does the Hevy interview process take?
Most candidates spend between 4 and 8 weeks from recruiter screen to offer. The onsite loop itself runs in a single day or is split across two half-days, with debrief and offer typically within 5 business days after.
How should I prepare specifically for Hevy?
Focus on three things: (1) the company DNA shown above - what they actually grade for, (2) the rounds in your loop, especially the round most candidates underestimate, and (3) drilling on the question types in this guide using a structured framework like CIRCLES or STAR.
Does this apply to engineering or design roles at Hevy?
The DNA stays the same - what changes is the round mix. SWE candidates face coding screens instead of Product Sense; designers face portfolio reviews and design exercises. The "what they value" and behavioral signals carry across all functions.
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