Refactoring Legacy Code
Free Intermediate course · 10 lessons · 3 weeks · Certificate on completion
Safely improve old, untested code without breaking production. Across 10 lessons you'll move from fundamentals to a portfolio-ready outcome — at your own pace, with quizzes after each lesson and a final exam to certify your mastery.
What you'll learn
- What legacy code is
- Characterisation tests
- Finding seams
- Extract method and class
- Breaking dependencies
- Renaming safely
Skills you'll pick up
- What legacy code is
- Characterisation tests
- Finding seams
- Extract method and class
- Breaking dependencies
- Renaming safely
Tools covered
- Refactoring
- Real-world projects
- Quizzes
- Final exam
Course modules
Module 1: What legacy code is
Module 1 of Refactoring Legacy Code. 3 lessons · 3h
Module 2: Extract method and class
Module 2 of Refactoring Legacy Code. 3 lessons · 3h
Module 3: Removing duplication
Module 3 of Refactoring Legacy Code. 2 lessons · 2h
Module 4: Refactoring with IDE tools
Module 4 of Refactoring Legacy Code. 2 lessons · 2h
Lessons in this course
- What legacy code is
- Characterisation tests
- Finding seams
- Extract method and class
- Breaking dependencies
- Renaming safely
- Removing duplication
- Strangling modules
- Refactoring with IDE tools
- Planning refactors
Instructor
Ananya Rao — API Platform Lead
Ananya Rao is a API Platform Lead with years of hands-on experience teaching Refactoring to thousands of learners worldwide.
Certificate
Finish every lesson and pass the final exam to earn a free, verifiable Learnera certificate for Refactoring Legacy Code. It can be downloaded as a PDF and shared on LinkedIn.
Career outcomes
Median global salary $120,000 per year · median India salary ₹16,80,000 per year · 66,596 open roles worldwide
- Refactoring Specialist
- Senior Refactoring Lead
- Refactoring Consultant
Frequently asked questions
Is the Refactoring Legacy Code course free?
Yes. Every Learnera course, including Refactoring Legacy Code, is completely free — lessons, quizzes, the final exam, and the certificate.
How long does Refactoring Legacy Code take?
10 lessons, typically completed in 3 weeks at a comfortable pace.
Do I get a certificate?
Yes — pass the final exam and you receive a free, verifiable certificate you can share on LinkedIn.