SOLID Principles for Flexible Code — PickAClass
⏱ 2h 54m 📚 29 lessons 🎧 Audio version

SOLID Principles for Flexible Code

Understand and apply SOLID design principles to write cleaner, more maintainable code with a focus on testability.

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About this course

Are you looking to write code that is easier to change, extend, and test? Understanding fundamental design principles is key to building robust software. This course will guide you through the core concepts of SOLID design, enabling you to create software that is inherently more flexible, readable, and maintainable. You will learn to structure your code in a way that reduces complexity and makes future modifications straightforward. What you'll learn: - Understand the five SOLID principles of object-oriented design. - Apply the Single Responsibility Principle to create focused classes. - Utilize the Open/Closed Principle for extensibility. - Implement the Liskov Substitution Principle for reliable inheritance. - Grasp the Interface Segregation Principle for efficient API design. - Practice Dependency Inversion for loosely coupled systems. - Integrate these principles into your daily coding workflow for better code quality. This text-based course begins with foundational definitions and gradually progresses to practical application, providing a clear path to mastering SOLID design. It is designed for beginners with no prior experience in object-oriented design principles, offering a solid foundation for writing better code.

Course contents

What you'll get

  • 📜 Certificate of completion
    Add it to your LinkedIn profile
  • 💬 Personal AI tutor
    Stuck on a lesson? Ask your built-in tutor anything, any time.
  • 🎧 Audio version included
    Learn on the go — no screen needed
  • ♾️ Lifetime access
    Come back anytime, no expiry
  • 📱 Phone or computer
    Works anywhere, any device
  • 💸 14-day refund
    No questions asked
  • ⚡ Short & focused
    2h 54m of practical content

Certificate of completion

Every course you complete on PickAClass issues a credential like this — original, with its own code, verifiable by URL, and detailed about what was actually demonstrated.

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PickAClass
Skills profile · verifiable
Document
Certificate of Mastery
This certifies that
Name Surname
has successfully demonstrated mastery of
SOLID Principles for Flexible Code
Skills demonstrated
✓
Behavioral pattern analysis
Foundational
1.2 hrs
✓
Decision-architecture frameworks
Proficient
1.4 hrs
✓
A/B test design
Proficient
1.7 hrs
✓
Behavioral copywriting
Advanced
1.9 hrs
P
PickAClass — Name Surname
SOLID Principles for Flexible Code
Page 2 of 2
Performance detail
Coursework summary
Lessons completed 14 / 14
Practice questions 26 / 28
Assignments submitted 4 (avg 4.5 / 5)
Capstone project Reviewed — 4.6 / 5
Total practice 6.2 hrs
Performance benchmark
Cohort rank Top 12% of 1,625
Time to completion 11 days (median: 22)
Mastery score 91 / 100
Practice-question score 94%
Skill verification Verified Skill Path
Verify this credential
pickaclass.com/certificates/PCC-2026-X4F7-AP19
Issued under the academic standards of PickAClass. Skill levels reflect assessed performance against the course's competency rubric. This is an original credential of this platform.

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Frequently asked

What do I need to take this course? +

Just a phone or computer with internet. No installs, no special hardware.

How do I pay? +

By card via Stripe. We don’t store card details — Stripe handles them securely.

Can I get a refund? +

Yes — full refund within 14 days, no questions asked.

How long will I have access? +

Forever. Once you purchase, the course is yours to revisit anytime.

Will I get a certificate? +

Yes. On completion you'll receive a certificate you can add to your LinkedIn profile.

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