Notebook Interview Example: Ad Click Prediction

In this final part of the section, we bring all the core concepts together through a realistic, end-to-end ML interview example. The walkthrough demonstrates how to apply best practices across the entire notebook round—from EDA to model evaluation—with clarity, intention, and real-world relevance.

- In **EDA**, we go beyond surface checks by exploring unique value counts, visualizing target distribution, spotting class imbalance, and identifying trends like CTR by device type—ensuring every insight informs downstream modeling.
- In **feature engineering**, we thoughtfully create new features (e.g., age buckets, time-of-day flags), handle multicollinearity, and tailor transformations based on domain intuition, not just standard recipes.
- During **model training**, we justify our choice of random forest for its robustness and interpretability, apply cross-validation and stratified splits, and run grid search for tuning—demonstrating intention behind every step.
- In **evaluation**, we use metrics that align with the problem (precision, recall, F1, AUC-ROC, confusion matrix) and interpret results in context, showing we understand the real-world stakes of false positives and negatives.
- For **follow-up questions**, we proactively discuss improvements (e.g., deeper models, richer features), production monitoring (CTR by segment, drift detection), and handling class imbalance—proving we think like end-to-end ML practitioners, not just coders.

This example illustrates how to move from “checking boxes” to demonstrating thoughtful, production-aware problem-solving under real interview conditions.

If you want to learn even more from Yayun:

- Book 1 on 1 career guidance with her here: <https://calendly.com/your-friend-yayun/1on1>
- Follow her on LinkedIn: <https://www.linkedin.com/in/yayunjin/>

Common Follow-up Questions

In this final part of the section, we’re reminded that **follow-up questions** in live ML interview rounds are crucial opportunities to demonstrate deeper thinking. How we respond after our initial solution can significantly elevate the impression we leave.

- When asked about **model improvement**, we show we understand what enhances performance—like adding features, collecting edge-case data, or exploring advanced models.
- Questions on **online evaluation** test our awareness of production concerns; we should mention metrics like latency, prediction confidence, user engagement, and drift monitoring.
- For **production issues**, strong answers highlight risks like distribution shift, data pipeline failures, or poor handling of unseen edge cases.
- When faced with **data challenges** (e.g., class imbalance), we demonstrate our grasp of solutions like resampling, class weighting, and choosing the right evaluation metrics.
- These follow-up answers are a prime chance to prove our **real-world awareness**, even if our initial model wasn’t perfect—they show we think like engineers, not just coders.

If you want to learn even more from Yayun:

- Book 1 on 1 career guidance with her here: <https://calendly.com/your-friend-yayun/1on1>
- Follow her on LinkedIn: <https://www.linkedin.com/in/yayunjin/>

Code Quality

In this section, we focus on **code quality**, a crucial yet often underestimated element of ML interviews. Even if our model works well, poorly written code can seriously damage our impression. Clean, clear code reflects professional maturity and real-world readiness.

- **Mediocre code** may be functional but is hard to read—characterized by cryptic variable names, long repetitive functions, unclear logic, and little to no documentation.
- **Stellar candidates write clean, organized code**, breaking it into logical chunks with reusable functions and clearly labeled sections.
- We use **meaningful variable names**, write comments that explain the "why" behind decisions, and maintain a logical flow from start to finish.
- Our code is **efficient in design**, avoiding unnecessary complexity and maintaining smooth execution without over-optimizing.
- Ultimately, we recognize that **code is communication**—and polished, maintainable code signals we’re ready to contribute to real engineering teams.

If you want to learn even more from Yayun:

- Book 1 on 1 career guidance with her here: <https://calendly.com/your-friend-yayun/1on1>
- Follow her on LinkedIn: <https://www.linkedin.com/in/yayunjin/>

Evaluation

In this section, we explore **model evaluation**, a phase that’s often underestimated but critically important. This is our chance to show we’re not just optimizing metrics—we’re aligning our work with real-world impact.

- **Mediocre evaluation** involves simply calling `.score()` or reporting accuracy, with little explanation or context—a major red flag in interviews.
- **Stellar candidates choose metrics that fit the problem**, such as F1 score or AUC-ROC for imbalanced classification, or MAE over RMSE for certain regression tasks.
- We demonstrate awareness of **trade-offs**, like how boosting recall might reduce precision, and explain the implications clearly.
- Most importantly, we **tie evaluation to business goals**, showing we understand the cost of errors and what metrics matter most in practice.
- This thoughtful approach proves that we’re not just building models—we’re optimizing for meaningful outcomes.

If you want to learn even more from Yayun:

- Book 1 on 1 career guidance with her here: <https://calendly.com/your-friend-yayun/1on1>
- Follow her on LinkedIn: <https://www.linkedin.com/in/yayunjin/>

Model Training

In this segment, we cover **model training**, a phase where many candidates fall into autopilot. To stand out, we need to show thoughtfulness, adaptability, and a clear connection between our choices and the problem at hand.

- **Mediocre performance** involves picking a default model (e.g., logistic regression or random forest), using out-of-the-box settings with no tuning or justification.
- **Strong candidates** choose models deliberately, explaining how their selection fits the **data characteristics, business goals, or system constraints**.
- We improve performance through **hyperparameter tuning**, using techniques like grid search or informed manual adjustments based on EDA insights.
- When appropriate, we apply **ensemble methods** (e.g., boosting, bagging, stacking) to push performance further.
- Most importantly, we demonstrate that our modeling choices are **intentional and grounded in context**, not just rote or random experimentation.

If you want to learn even more from Yayun:

- Book 1 on 1 career guidance with her here: <https://calendly.com/your-friend-yayun/1on1>
- Follow her on LinkedIn: <https://www.linkedin.com/in/yayunjin/>

Feature Engineering

In this part of the course, we focus on **feature engineering**, a critical area where interviewers differentiate between average and exceptional ML candidates. This is our opportunity to show not just technical skill, but creativity and judgment.

- **Mediocre feature engineering** relies on basic, mechanical steps—like one-hot encoding categoricals or normalizing numericals—without much customization.
- **Stellar candidates go further**, creating new features from raw data (e.g., extracting time-of-day from timestamps, or combining variables into meaningful interactions).
- We show thoughtfulness by **dropping irrelevant features**, checking for **multicollinearity**, and aligning features closely with the problem's objectives.
- We demonstrate versatility by handling **complex data types**—such as transforming freeform text, working with embeddings, or aggregating time series effectively.
- Ultimately, we recognize that **feature engineering can matter more than the model itself**, and our job is to shape the data so that the model can truly learn from it.

If you want to learn even more from Yayun:

- Book 1 on 1 career guidance with her here: <https://calendly.com/your-friend-yayun/1on1>
- Follow her on LinkedIn: <https://www.linkedin.com/in/yayunjin/>

In this segment, we explore the importance of **Exploratory Data Analysis (EDA)** in machine learning interviews, especially during notebook-based exercises. This is a key moment to distinguish ourselves by demonstrating analytical depth and real-world intuition.

- We move beyond just **checking for missing values or printing basic stats**, which signals a surface-level approach.
- Instead, we analyze **feature distributions**, identifying skewness, outliers, and unusual patterns that may affect modeling.
- We examine **relationships and interactions between variables**, not just computing correlations, but exploring potential dependencies and dynamics.
- We assess **data quality**, including duplicates, inconsistent categorical values, and signs of data leakage.
- This deeper EDA shows that we can **interrogate the data critically**, a trait that interviewers associate with strong, production-ready ML practitioners.

If you want to learn even more from Yayun:

- Book 1 on 1 career guidance with her here: <https://calendly.com/your-friend-yayun/1on1>
- Follow her on LinkedIn: <https://www.linkedin.com/in/yayunjin/>

Round Structure

In this section, we dive into one of the most important—and often most hands-on—parts of the ML interview process: the practical machine learning coding and modeling round. This is where we demonstrate how we think and work like real ML practitioners.

- We’ll usually work in a **Jupyter notebook environment**, either in a take-home format or during a live 60–90 minute session.
- The task typically involves a **real-world problem** like text classification or demand forecasting, where we're expected to deliver an end-to-end ML workflow.
- Unlike algorithm rounds, we’re **encouraged to use standard ML libraries** (e.g., pandas, scikit-learn, TensorFlow, PyTorch) to solve the problem efficiently.
- We’ll be evaluated on how we **explore data, engineer features, choose models, tune hyperparameters**, and **communicate our results**.
- This round is about **thinking like an ML practitioner**, showing that we can handle messy, ambiguous problems using practical tools to deliver meaningful solutions.

If you want to learn even more from Yayun:

- Book 1 on 1 career guidance with her here: <https://calendly.com/your-friend-yayun/1on1>
- Follow her on LinkedIn: <https://www.linkedin.com/in/yayunjin/>

Explanation Examples

In this extended segment, we see the CLEAR framework applied to real machine learning interview questions. Through examples, we’re shown how to craft strong, structured answers that go far beyond buzzwords or surface knowledge. This approach helps us communicate our understanding with clarity and depth.

- For a question like **"How do decision trees work?"**, we learn to walk through each part of CLEAR: define the concept, link to related ideas (e.g., random forests), provide real-world use cases, weigh pros and cons (e.g., interpretability vs. overfitting), and explain evaluation metrics (e.g., accuracy, RMSE).
- When comparing **CNNs vs. RNNs**, we avoid vague statements and instead explain each model’s core function, typical applications (e.g., image classification vs. time-series forecasting), and evaluation metrics, even including hybrid use cases for extra depth.
- For the common question **"How do you handle class imbalance?"**, we’re shown how to define the issue, link it to broader modeling challenges, provide realistic examples (e.g., fraud detection), explore trade-offs in techniques like resampling and reweighting, and select meaningful metrics like precision, recall, and AUC-ROC.
- We’re reminded that **bad answers often list jargon** without context or reasoning, while **great answers show structured thought**, connect theory to practice, and demonstrate the ability to make sound trade-offs.

If you want to learn even more from Yayun:

- Book 1 on 1 career guidance with her here: <https://calendly.com/your-friend-yayun/1on1>
- Follow her on LinkedIn: <https://www.linkedin.com/in/yayunjin/>

Common Pitfalls (Red Flags)

In this section, we’re cautioned against common mistakes that even capable candidates make during ML interviews. By knowing what to avoid, we can better showcase our understanding with clarity, relevance, and maturity.

- We avoid **math without context**—using complex terms without explaining their real-world application often hurts more than it helps.
- We steer clear of **overcomplicating explanations**, especially when simpler, intuitive answers are more effective.
- We make sure not to **misapply ML techniques**, choosing the right tool for the problem rather than defaulting to complexity.
- We are careful not to **confuse correlation with causation**, especially when interpreting features or results without proper experimentation.
- We stay grounded by not **overstating model performance** and always considering **data quality** as a core factor in success.

By being clear, humble, and practically minded, we avoid these pitfalls and come across as thoughtful and well-prepared candidates.

If you want to learn even more from Yayun:

- Book 1 on 1 career guidance with her here: <https://calendly.com/your-friend-yayun/1on1>
- Follow her on LinkedIn: <https://www.linkedin.com/in/yayunjin/>

The CLEAR Framework

In this part of the course, we learn how to speak about machine learning concepts in a way that’s clear, confident, and impactful. The instructor introduces a practical, repeatable framework—CLEAR—that helps us explain any concept with structure and depth.

- **C is for Conceptualize**: Start with a high-level, simple definition of the concept (e.g., logistic regression predicts binary outcomes).
- **L is for Link**: Connect the concept to related ideas or typical use cases, showing broader understanding.
- **E is for Example**: Provide a real-world application to ground the concept in practice.
- **A is for Advantages and Disadvantages**: Discuss trade-offs to demonstrate critical thinking.
- **R is for Result**: Explain how success is measured using appropriate evaluation metrics.

By using the CLEAR framework, we present ourselves as organized, knowledgeable, and experienced—even when discussing foundational topics.

If you want to learn even more from Yayun:

- Book 1 on 1 career guidance with her here: <https://calendly.com/your-friend-yayun/1on1>
- Follow her on LinkedIn: <https://www.linkedin.com/in/yayunjin/>

How To Properly Learn

In this section, we focus on the kind of preparation that truly sets us apart in machine learning interviews. Rather than relying on surface-level memorization, we learn how to build a deep, applied understanding that shines under follow-up questions and real-world discussion.

- We aim to **go beyond surface knowledge**, learning not just definitions but also how and why concepts work.
- We must understand **implementation details**, like the loss function in logistic regression or how feature importance is calculated in random forests.
- We should avoid vague “buzzword” answers and instead be honest if unsure—showing how we would reason through the problem is often more impressive than guessing.
- We connect **theory to practice**, drawing clear links between ML concepts and our own project experience to demonstrate applied understanding.
- We focus on **breadth with clarity**, going deep only where relevant, and always aim to explain ideas in a concise and structured manner to reflect true expertise.

If you want to learn even more from Yayun:

- Book 1 on 1 career guidance with her here: <https://calendly.com/your-friend-yayun/1on1>
- Follow her on LinkedIn: <https://www.linkedin.com/in/yayunjin/>

Foundational Ideas

In this key section of the course, we dive into the essential machine learning concepts that consistently appear across all types of ML interviews. This foundation prepares us to explain not just the “what,” but the “why” behind our choices—something interviewers value highly.

- We review core **ML paradigms** like supervised, unsupervised, and reinforcement learning, along with real-world examples to explain their use cases clearly.
- We explore **machine learning tasks** such as classification and regression, and when to apply specific evaluation metrics like precision, recall, or RMSE.
- We gain a deep understanding of **model performance** concepts—bias/variance trade-off, underfitting/overfitting—and how to recognize and address them.
- We cover **validation strategies**, data leakage prevention, and the right use of metrics beyond just accuracy, such as AUC-ROC and F1 score.
- We enhance our skills in **feature engineering**, **optimization algorithms** (like SGD and Adam), **model selection reasoning**, and **dimensionality reduction** techniques like PCA and UMAP.
- We also touch on **LLM fundamentals**—such as Transformers and encoder-decoder architectures—to stay current with emerging trends.
- Most importantly, we practice explaining all of this in a way that connects to real-world problems and highlights our decision-making skills.

If you want to learn even more from Yayun:

- Book 1 on 1 career guidance with her here: <https://calendly.com/your-friend-yayun/1on1>
- Follow her on LinkedIn: <https://www.linkedin.com/in/yayunjin/>

Course Roadmap

In this part of the course, we’re given a roadmap that outlines the full journey of preparing for machine learning interviews. Each section is designed to build our skills systematically and strategically, based on real-world experience and mentorship insights.

- We start with **essential ML concepts**, learning how to clearly explain high-frequency topics that appear in nearly every interview.
- We then move into **practical ML coding and modeling**, covering notebooks, EDA, model selection, feature engineering, and evaluation techniques.
- **Coding foundations** are reinforced to help us succeed in general algorithm rounds, with a focus on what companies expect from ML candidates.
- We’ll tackle **ML algorithm coding**, where we may be asked to implement algorithms like decision trees or k-means from scratch.
- **ML system design** is emphasized for senior-level roles, with frameworks and examples for building scalable systems.
- Finally, we prepare for **project deep dives and behavioral interviews**, learning how to share impactful stories, followed by crafting a personalized **study plan** that fits our timeline and goals.

If you want to learn even more from Yayun:

- Book 1 on 1 career guidance with her here: <https://calendly.com/your-friend-yayun/1on1>
- Follow her on LinkedIn: <https://www.linkedin.com/in/yayunjin/>

Different Roles, Different Focus

In this section, we explore how the emphasis on the four pillars of ML interview success shifts depending on the specific role we’re targeting. The course is designed to help us align our strengths with the expectations of different ML career paths.

- We learn that **ML infrastructure roles** prioritize software engineering and system design, as these roles focus on building scalable and reliable ML platforms.
- **Product-focused ML roles** value end-to-end system design and business impact, requiring us to connect our technical solutions directly to user outcomes.
- For **research-oriented roles**, a deep dive into ML theory and algorithms is essential, with an emphasis on innovation and pushing technical boundaries.
- We’ll identify our personal strengths and tailor our preparation to highlight the most relevant ones for our target role.
- We’ll also work on filling any skill gaps so we can enter interviews with greater confidence and a clear strategy.

If you want to learn even more from Yayun:

- Book 1 on 1 career guidance with her here: <https://calendly.com/your-friend-yayun/1on1>
- Follow her on LinkedIn: <https://www.linkedin.com/in/yayunjin/>

The 4 Pillars of ML Interview Success

In this segment of the course, we’re introduced to the core framework for succeeding in machine learning interviews: the four pillars of ML interview success. These pillars form the foundation of how we’re evaluated and what we should focus on during preparation.

- We need strong **software engineering foundations**, including clean coding, system design, and engineering best practices.
- We must demonstrate a solid understanding of **machine learning theory and algorithms**, knowing when and why to apply specific methods and models.
- We should be able to **design and implement end-to-end ML systems**, translating business problems into ML solutions while considering scalability, deployment, and data quality.
- We’re expected to show **business acumen**, aligning our technical decisions with product goals and user needs.
- Each interview round targets one or more of these pillars, and we’ll stand out by showing balanced strength across all four.

If you want to learn even more from Yayun:

- Book 1 on 1 career guidance with her here: <https://calendly.com/your-friend-yayun/1on1>
- Follow her on LinkedIn: <https://www.linkedin.com/in/yayunjin/>

Introduction

Machine learning interviews are brutal—and most engineers prep for them the wrong way. This course flips that on its head. Here’s what's covered in this lesson:

- Your instructor Yayun Jin walks you through her background as an ML lead who’s been on both sides of the interview table. She goes through her journey breaking into the ML world, working across startups and big tech, and interviewing 100+ ML candidates.
- You’ll learn why most prep strategies fail: They're too scattered, too theoretical, and completely disconnected from how interviews actually work.
- We’ll walk you through the course game plan so you know exactly what to expect:
  - 🧭 Learn how to prep for ML interviews with structure instead of chaos

  - 🔍 Understand key differences between ML roles (ML engineer, infra, AI engineer) so you don’t waste time on irrelevant material

  - 🧱 See what great performance looks like in each interview type: coding, modeling, system design, and behavioral

  - 🚀 Get actionable prep tactics tailored for both current ML pros and SWE-to-ML switchers

  - 🎯 Understand how expectations shift based on seniority—so you’re not prepping like a junior when you’re going for a senior role

If you want to learn even more from Yayun:

- Book 1 on 1 career guidance with her here: <https://calendly.com/your-friend-yayun/1on1>
- Follow her on LinkedIn: <https://www.linkedin.com/in/yayunjin/>

Becoming A Legendary Meta Coder: The Story of the First E7 Code Machine

There are many complex ways [**to get to staff and beyond**](https://www.jointaro.com/course/grow-from-senior-to-staff-engineer-l5-to-l6/why-have-archetypes/), but one of them is actually quite straightforward (at least at Meta): *Just write more code than everyone else by a **staggering** amount.*

That's exactly what [**Michael Novati**](https://www.linkedin.com/in/michaelnovati/) did to get to Staff \[E6\] at Meta and eventually Senior Staff \[E7\]. Since Michael was early Facebook, there actually wasn't a Staff Engineer archetype at the time to capture the way he was adding immense value to the company. So they added it! Thanks to Michael, there is now a formal "Code Machine" archetype in the official Meta internal wiki.

Michael will be breaking down:

- His story about how he became Meta's first incredibly senior "Code Machine" engineer
- The most impactful projects he worked on
- How he managed his time effectively to write so many diffs.

At the end, we'll have time for Q&A where you can ask Michael questions about topics like:

- How he grew so quickly and crafted such an extraordinary career
- What the early days at Meta were like
- Different ways to create a unique brand for yourself, your work, and your career

If you need extra help breaking into top tech companies like FAANG, [**Formation.dev**](http://Formation.dev) is here to provide you hands-on, personalized support. Join Michael and the rest of the awesome team at Formation here: [**https://formation.dev/partners/taro**](https://formation.dev/partners/taro)

Conclusion

That’s it.

Not the end—just the moment you stop walking with a guide and start carrying the weight yourself.

You’ve got the tools. The stories. The bruises that come with learning anything real.

Now carry it forward.

Ownership doesn’t show up in the big speeches. It shows up in the quiet. In what you do when no one’s clapping. In what happens after the meeting ends.

**Workbook:** [Creator’s Orientation](https://drive.google.com/file/d/1sysZuPhlrLZbU5stxlJBqg3LAcGTy_S7/view?usp=sharing)

**Want to go deeper?**

- Explore more tools and courses at [**Taha’s Method**](https://www.tahasmethod.com/) — from interview prep to leadership development.

- Follow me on [**LinkedIn**](https://www.linkedin.com/in/tahahussain/) and subscribe to my weekly newsletter, [**The Conscious Leader**](https://tahahussain.substack.com/), for more lessons like these.

- Get 30% off [**Top Tech Leader**](https://bit.ly/tarotopleader) with code **ILOVETARO** (exclusive for Taro members).

Let them carry it. You’ve done your part.

You’ve seen the pieces.\
Now we pull them together.

This final act is about how ownership moves—how everything you’ve practiced shows up when things get messy, unclear, or just plain stuck.

It’s less about new ideas, more about recognizing the patterns, and deciding what to do when they land on your desk.

**Workbook:** [Creator’s Orientation](https://drive.google.com/file/d/1sysZuPhlrLZbU5stxlJBqg3LAcGTy_S7/view?usp=sharing)

**Want to go deeper?**

- Explore more tools and courses at [**Taha’s Method**](https://www.tahasmethod.com/) — from interview prep to leadership development.

- Follow me on [**LinkedIn**](https://www.linkedin.com/in/tahahussain/) and subscribe to my weekly newsletter, [**The Conscious Leader**](https://tahahussain.substack.com/), for more lessons like these.

- Get 30% off [**Top Tech Leader**](https://bit.ly/tarotopleader) with code **ILOVETARO** (exclusive for Taro members).

Tech Career Growth Videos

Our instructional videos provide software engineers with insights needed for career growth. Masterclasses go incredibly in-depth on a specific tech topic while case studies are real examples from established engineering leaders.