How long does the 01Health 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 01Health?

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 01Health?

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.

Other roles at 01Health:Product Manager Software Engineer Sales Customer Success

Growth · Software Engineer Interview Guide

How to Pass the 01Health Software Engineer Interview in 2026

The 01Health DNA (TL;DR)

The 'Plex Sans' principle at 01Health underscores a demand for absolute clarity and conciseness in all communication. Interviewers assess how candidates structure thoughts, present complex pharma concepts simply, and articulate trade-offs with precision, mirroring the clean aesthetic of their brand.

The 01Health Interview Loop

Your onsite loop will typically consist of 5 rounds.

1
Round 1
Recruiter Screen
Motivation, role fit, logistics.
2
Round 2
Coding Screen
LeetCode-medium algorithmic problems under time pressure.
3
Round 3
System Design
Distributed systems, trade-offs at scale, architecture under constraints.
4
Round 4
Onsite Coding
LeetCode-hard, debugging, code clarity, edge cases.
5
Round 5
Behavioral / Leadership
Past evidence of ownership, influence, resolving conflict.

The Danger Zone: Top Reasons Candidates Fail

Based on our database of 01Health interview outcomes, avoid these common traps:

Focusing on persuasive tactics without understanding the stakeholder's perspective.
Attributing the problem solely to external factors without taking ownership of the solution.
Appearing overly aggressive or passive in the conflict.
Implementing a batch processing approach instead of a streaming/real-time one.

Test Yourself: Real 01Health Questions

Three real prompts pulled from our database.

Type · scalability

Design a system to manage and serve personalized drug information and dosage recommendations to millions of patients globally. Consider data ingestion from various sources (EHRs, wearables, patient input), real-time processing, and secure delivery.

Type · Conflict Resolution

Tell me about a time you had a significant disagreement with a colleague or manager. How did you handle it, and what was the outcome?

Type · data_structures

You have a large, sorted list of clinical trial participant IDs. You also have a stream of incoming events, each associated with a participant ID (e.g., a lab result, a doctor's note). Design a data structure to efficiently: 1. Check if a participant ID exists in the sorted list. 2. Add new events for a given participant ID. 3. Retrieve all events for a participant ID.

+ many more questions, signals, and worked examples

Unlock the rubric

01Health Interview Question Bank

A sample from our database, grouped by round. Sign up to see the full set.

9 of 18 questions shown

Recruiter Screen

1
Type · motivation
What specifically about 01Health's mission in the pharma space, and our focus on [mention a specific therapeutic area or technology if known], interests you as a software engineer?

Coding Screen

2
Type · algorithmic
Given a dataset of patient treatment outcomes (e.g., drug efficacy, side effects) over time, design an algorithm to identify patients who are likely to experience a specific adverse event within the next 30 days. Assume data is time-series and potentially sparse.
3
Type · data_structures
You have a large, sorted list of clinical trial participant IDs. You also have a stream of incoming events, each associated with a participant ID (e.g., a lab result, a doctor's note). Design a data structure to efficiently: 1. Check if a participant ID exists in the sorted list. 2. Add new events for a given participant ID. 3. Retrieve all events for a participant ID.
+ 1 more questions in this round (sign up to unlock)

System Design

4
Type · scalability
Design a system to manage and serve personalized drug information and dosage recommendations to millions of patients globally. Consider data ingestion from various sources (EHRs, wearables, patient input), real-time processing, and secure delivery.
5
Type · reliability
Design a distributed system for real-time monitoring of clinical trial drug supply chains. The system should track inventory levels, temperature, and location of sensitive pharmaceuticals across multiple distribution centers and ensure data integrity.
+ 1 more questions in this round (sign up to unlock)

Onsite Coding

6
Type · hard_algorithmic
Implement a function to find the shortest path in a 3D grid representing a complex molecular structure, where movement is restricted by chemical bonds and energy potentials. The grid can be very large and sparse.
7
Type · debugging
Here is a Python script that attempts to process patient EMR data to identify potential drug interactions. It's producing incorrect results and occasionally crashing. Debug and fix the code.
+ 2 more questions in this round (sign up to unlock)

Behavioral / Leadership

8
Type · Ownership
Tell me about a time you took initiative and went above and beyond your defined responsibilities to solve a problem or achieve a goal for a client.
9
Type · Influence
Describe a situation where you had to influence a difficult stakeholder or team member to adopt your recommendation or approach. How did you handle it?
+ 5 more questions in this round (sign up to unlock)