$290 / month
Start free, decide later
Hi, I’m Stelios
I’m a Principal Engineer with 13 years of experience building and scaling systems at companies like Meta, Amazon, Google, Microsoft, and Samsung. My work has spanned machine learning, system design, and platform engineering—often leading high-impact teams that delivered production-ready solutions at global scale.
I’ve conducted 600+ interviews across top tech firms and have coached dozens of candidates into senior and principal roles. I focus on system design, ML system design, algorithms and data structures, coding, and behavioral interview prep.
I find energy in helping engineers unlock their next level—whether that’s nailing a staff-level system design interview, tightening behavioral stories to land a dream role, or just debugging a tricky algorithm together.
If you’re looking for a mock interview, career advice, or strategic guidance to move from senior to principal, I’d be excited to help. Let’s work together to sharpen your edge and take the next step with confidence.
5 out of 5 stars
Standard Plan • 6 months
5 out of 5 stars
Standard Plan • 1 month
You tell Stelios your goals. They see exactly what you want to work on before session one.
You meet within days. Stelios reviews your application and books your first session, usually within a day or two.
You leave with a plan. Concrete next steps and a weekly rhythm from your very first week.
Stelios D
Staff Machine Learning Engineer at Meta
Enter your email and we'll let you know when Stelios has open spots. You'll also get a link to manage your wishlist – no account needed.
Book a free intro call with Stelios
Connect with Stelios in a quick call (usually 15-20 minutes)
One-off sessions with Stelios
One-off sessions are a great option if you're looking for specific advice on a certain topic.
An introductory call is a simple way to get to know a mentor before committing to ongoing mentorship. This session gives you the chance to …
A strong portfolio can open doors, but only if it clearly shows what you can do and why it matters. This MentorCruise session is designed …
Your resume often decides whether you get the interview or get overlooked. This MentorCruise session is designed to help you strengthen your resume so it …
Whatever doesn't fit the mold: Get 30 minutes with a mentor to discuss your needs. Be it help with some code, discussing through an issue …
Sometimes the fastest way to grow is to get thoughtful feedback on the work you are already doing. This MentorCruise session is designed to help …
Career growth rarely happens by accident. This MentorCruise session is designed to help you build a clearer roadmap for where you want to go next …
A good study plan does more than organize your time. It helps you focus on the right things, build momentum, and make steady progress without …
Interview preparation is about showing up with clarity, confidence, and a strong sense of how to present your experience. This MentorCruise session is designed to …
Whatever doesn't fit the mold: Get a full hour with a mentor to discuss your needs. Be it help with coding something, deciding on a …
What's included in the trial?
Every trial is a little different–here's what Stelios says about their trial:
We'll meet for a quick call (usually under 30 minutes) where we:
- Break the ice and introduce ourselves
- Discuss your goals and how I can support you
- Coordinate logistics like time zones, meeting frequency, and communication methods
