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The .NET Senior Playbook
Go deep enough in .NET that AI can't replace you.
Your fastest path from junior to senior, the depth to keep growing as a senior, and everything to ace .NET interviews — modern C#, async and memory, ASP.NET Core APIs, EF Core and performance, security, caching, and production-ready architecture.
By Anton Martyniuk · Microsoft MVP · 13+ years in .NET
One Playbook, three goals
Whether you're leveling up, growing as a senior, or preparing for interviews — it's built for you.
Fast-track to Senior
The quickest roadmap from junior or mid-level to a senior .NET developer.
Grow beyond Senior
Everything you need to keep expanding your senior career — deep dives, system design, and tech-lead depth.
Beat any interview
Everything you need to walk into a .NET interview at any level and pass with confidence.
Do I really need to learn .NET if I use AI?
Yes. And AI is one of the main reasons to learn it properly.
AI can produce a working implementation. Deciding whether it's the right implementation still takes someone who knows the trade-offs, and that's the skill the job market now pays for.
AI hands you an option. You decide the trade-offs.
Which caching strategy, which DI lifetime, which consistency model, which index. Picking the right one is still your job, and it's what architecture reviews and interviews actually test.
AI sounds confident when it's wrong.
You can only catch that if you already know the topic. Without the depth you can't review what AI produces, and it bites you later in production.
AI writes the code. You own the outage at 3am.
N+1 queries, memory leaks, race conditions under load, a migration that locks a table. You are still responsible when production breaks.
That judgment is what this Playbook builds: 50 chapters of the trade-offs, failure modes, and production details AI can't teach you.
The fastest road to Senior .NET Developer and beyond.
Wherever you are today — junior, mid, or senior — here's exactly what's holding you back, and what to do about it.
Junior
You're learning fast, but the .NET ecosystem is enormous.
- You don't know which topics actually matter for getting hired
- Interview questions feel random and you can't tell what's important
- You're guessing what to study next and often guessing wrong
Mid-level
You ship features, but the senior label keeps slipping past you.
- You can't pinpoint what separates you from the seniors on your team
- DI lifetimes, caching, messaging - you use them but couldn't explain them in depth
- You're not sure what options to select. What are the trade-offs, pros and cons?
Senior
You're senior on paper, but blind spots show up at the worst moments.
- Topics you skipped early on now surface in architecture reviews
- Interviewers probe areas you've never had to formalize
- You want a structured map of what 'senior' actually covers
Random blog posts, scattered YouTube videos, and docs skimmed before an interview won't get you there.
This Playbook does.
Take a look inside
See exactly what you're getting
Make it yours
Tune the course to your level
Pick your experience level and how hard the tests should be — the course adapts to you.
Test yourself
Take a test after every chapter
Mid-chapter tests, full chapter tests, and a final exam — so you prove you actually know it, not just that you read it.
Questions & answers
Read questions with expert answers
Every question comes with an in-depth written answer, copy-ready code, and diagrams and comparison tables where they help.
Active recall
Try first, reveal when ready
Attempt each question yourself, then reveal the full solution whenever you want.
Instant feedback
See results and explanations
Get scored the moment you submit, with a clear explanation for every answer.
Watch a quick walkthrough
Table of contents
50 chapters spanning the full .NET ecosystem.
From the fundamentals every junior needs to master, to the advanced topics that define senior-level expertise: 800+ questions with in-depth answers.
Try 10 chapters free for 14 days
10 complete chapters, around 170 questions, with their chapter tests. C# Fundamentals, LINQ, Async, Minimal APIs and EF Core: the topics every .NET interview opens with.
No card, nothing to cancel. Read them, take the tests, and see whether the format works for you. Everything you do is saved — if you buy later, you carry on exactly where you stopped.
How to Use
How to Use This Playbook
This playbook covers all the topics you need to advance your .NET career — whether you're a junior developer reaching for a mid-level position, a mid-level developer ready to break into senior, or a senior who wants to level up and fill in the gaps. Here are four ways to get the most out of it.
Prepare for .NET Interviews
Going through a hiring process? Work through the chapters that match the job description. Practice answering each question out loud or in writing. By the time you walk in, you'll have already seen the hardest questions they can throw at you.
Find Your Knowledge Gaps
Go chapter by chapter and try to answer each question before reading the answer. Every time you struggle or get it wrong — you've found a gap. This is the fastest way to build an honest map of what you know and what you don't.
Level Up Few Minutes a Day
Pick one chapter per day and work through a few questions each morning or evening. In a few weeks, you'll have covered the entire .NET ecosystem — without ever feeling overwhelmed. Small, consistent progress compounds fast.
Train and Mentor Your Team
If you lead a team, use the playbook as a structured learning resource for your developers. Assign chapters based on skill level, use the questions for one-on-one discussions, or run weekly knowledge-sharing sessions around a single topic.
Is This Playbook Right for You?
The .NET Senior Playbook is built around three goals — fast-tracking you to senior, helping seniors grow further, and preparing you to beat interviews. Here's how to know if it's the right fit.
This is for you if:
- You're a junior .NET developer who wants a clear roadmap to mid-level
- You're a mid-level developer ready to break into a senior role
- You're a senior developer who wants to fill blind spots and stay sharp
- You're preparing for a .NET technical interview at any level
- You lead a team and need a structured training resource for your developers
- You want to understand what the .NET job market actually expects in 2026
This is NOT for you if:
- You have zero programming experience — this course assumes basic C# and .NET knowledge
- You're a .NET trainee or very recent junior who doesn't yet understand how .NET and C# fundamentally work
- You're working on Desktop, Mobile, Game Dev projects or any kind of projects not related to ASP.NET Core
- You only work with other tech stacks (Java, Python, Go) and don't plan to work with .NET
- You're not willing to put in the effort — this playbook delivers results for those who actively work through it
- You are a Technical Lead, Principal Developer, or an Architect who is already proficient and has a deep knowledge of modern .NET and ASP.NET Core.
Bonuses
Everything That Comes With the Playbook
The .NET Senior Playbook is more than just questions and answers. Every package comes loaded with bonus playbooks, career resources, and tools to help you land the role and grow faster.
Bonus Playbooks Included
Go beyond C# and .NET with focused guides on SOLID Principles, Design Patterns (all packages), Soft Skills Interview Questions, and Real-World Senior System Design Questions (Premium).
Career Toolkit to Land the Job
Stand out before the interview even starts with LinkedIn Profile Optimization Guide, GitHub Profile Optimization Guide, and Side-Projects Guide (available in Premium Package).
Hands-On Tests, Not Just Reading
Try each question first and reveal the answer when you're ready — then prove it with a mid-chapter test, a chapter test, and a final exam after every topic. The Custom Test Builder (Premium) lets you generate your own test from any chapters.
Direct Access to Me
I'm Anton Martyniuk — Microsoft MVP, software architect, and .NET developer with 13+ years of experience. Get direct access to me (and other members) in my private Discord community where you can ask questions directly (available in Premium Package).
Author
Anton Martyniuk — Microsoft MVP, Software Architect, .NET Developer
Hey, I'm Anton — a Microsoft MVP, Software Architect, and .NET developer with over 13 years of experience building production systems, leading teams, and shipping software that actually matters.
I run the Anton DevTips newsletter — one of the top .NET newsletters with 28,000+ subscribers — and share daily content on LinkedIn with a community of 120K+ developers. I've spent years helping .NET developers at every level get unstuck, close knowledge gaps, and reach the next stage of their careers.
I wrote The .NET Senior Playbook because I kept seeing the same problem: talented developers can't get better promotions or better jobs. I've made the expensive mistakes already and wasted months and years studying wrong topics. You will do it right the first time. This is the path I walked myself, written down, so you don't need many years to get there.
What customers are saying about the playbook...
Why this works when other courses didn’t
You'll know exactly what to study
Random videos and blog posts leave gaps you can't see, and you find them in an interview. Here you get the exact topics the job market actually asks for, so you learn it right the first time.
You'll find out whether it stuck
Every chapter ends with a test, then a final exam. Tests prove that the topics actually stuck.
Revolutionary learning method
It was built using a revolutionary method that will help you memorize and understand complex topics. You mark the complexity of each topic and it builds your daily studying map.
Learn on any device
You can learn this course at your own pace and you can do it on any device. The website is adapted for mobile devices, tablets, laptops and any screen size.
Pricing
Pick Your Package
“The .NET Senior Playbook” is available in two packages so you can pick the one that's right for your goals.
- Features included:
- The .NET Senior Playbook (800+ questions, 50 chapters)$150
- C# Interview Questions$150
- Source code for course chapters$100
- The course includes tests in each chapter and a final exam
- 🎁 Bonuses included:
- SOLID Principles Blueprint$75
- Design Patterns Blueprint$75
- Total bonus value: $150 — included free
- Everything in Standard, plus:
- Custom Test Builder — generate your own test from any chapters across the course
- Real-World Senior System Design Questions$100
- Soft Skills Interview Playbook$75
- LinkedIn Profile Optimization Guide$100
- GitHub Profile Optimization Guide$100
- Side-Projects Guide$100
- 🎁 Premium bonuses:
- Private Discord community access — ask me questions on the course directly$300
- SOLID Principles Blueprint$75
- Design Patterns Blueprint$75
Let's find an option that works for you.
🛡️ Every plan is backed by our 14-day money-back guarantee — try it risk-free.
Personal-use license: Each purchase is for one individual. Account sharing is not permitted. Team licensing available below.
Team licensing: Need to train your whole team? Contact me for team packages and volume pricing.
Have your company pay for it: Many teams have a learning & development budget.
Two Paths From Here
Without a senior-level foundation:
- You know a lot of .NET features but still can't tell which one to reach for under pressure.
- Interview questions on concurrency, EF Core internals, and design patterns leave you guessing.
- You copy architecture patterns that work — until the project grows and you're stuck.
- You keep getting passed over for senior roles, watching people who can explain the "why" get promoted first.
After you complete The .NET Senior Playbook:
- You understand the fundamentals underneath every feature, so you reach for the right tool instantly.
- You answer senior interview questions — concurrency, EF Core, design patterns, system design — with the depth that gets offers.
- You architect applications that scale cleanly, and you can defend every decision in a review.
- You step into a senior role carrying skills most developers only pick up after years on the job.
Frequently Asked Questions
The course & how it works
Is it right for me?
Plans, pricing & payment
Certificate
Teams, access & licensing
Why this Playbook & about me
Still have a question? Email me at [email protected].
Try it risk-free for 14 days
If the playbook isn’t right for you, email me within 14 days and I’ll refund you in full — no questions asked. The only real risk is walking into your next interview unprepared.
Become the .NET developer they’re looking for
800+ real-world questions across 50 chapters, hands-on tests after every chapter, and a verifiable certificate when you finish. Close every gap and walk into your next interview ready.
Lifetime access · Free future updates · 14-day money-back guarantee