Refactor a Tangled Java Pricing Engine With Design Patterns
Overview
What this challenge is about.
Refactor a Tangled Java Pricing Engine With Design Patterns. Intermediate challenge in code. Writing production code that solves real engineering problems, e...
The Brief
What you'll do, and what you'll demonstrate.
Refactor a 4,800-line pricing class into a clean OO design using Strategy, Decorator, and Chain of Responsibility with provable zero behavior change.
This is not a coding exercise. It is the work a software engineer does between a Jira ticket and a merged PR. That distinction matters to every hiring manager who has seen candidates solve LeetCode problems and none who have shipped production code under real constraints.
When you finish, you will have something most graduates do not: a real-world deliverable, verified by Ewance, that you can show to a hiring manager and say "I did this. Here is the proof."
Earning criteria — what you'll demonstrate
- Apply Strategy, Decorator, and Chain of Responsibility on a real codebase
- Maintain zero behavior change during a structural refactor
- Translate an if/else chain into a polymorphic, testable design
- Author a design doc with UML that a reviewer can act on
Program Fit
Where this fits in your program.
Sharpens the same skills your degree expects you to demonstrate.
Aligned coursework coming soon.
Skills
Skills you'll demonstrate.
Each one shows up on your verified credential.
- Java
Apply java to solve real industry problems and demonstrate production-level capability.
- Design Patterns
Apply design patterns to solve real industry problems and demonstrate production-level capability.
- Refactoring
Apply refactoring to solve real industry problems and demonstrate production-level capability.
- Oo Design
Apply oo design to solve real industry problems and demonstrate production-level capability.
- Unit Testing
Apply unit testing to solve real industry problems and demonstrate production-level capability.
- Code Review
Apply code review to solve real industry problems and demonstrate production-level capability.
Careers
Career paths this challenge builds toward
Completing this challenge demonstrates skills that transfer directly to these roles: