Formulatrix Engineering Talent Day

Homework Test 1 - Coding Competency Test

Role: Software Engineer - Backend
Candidate: Azka Rabbani Minanda

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Welcome to my submission for the Formulatrix Engineering Talent Day. This repository contains the solution for the Coding Competency Test Challenge, demonstrating scalable and clean code practices using the latest .NET 10 framework.

📋 Assessment Overview

The goal of this project is to solve a series of progressive algorithmic problems (variations of the FizzBuzz problem), evolving from simple procedural logic to a scalable Object-Oriented solution.

Problem Breakdown

Question	Description	Approach Taken
Q1	Basic Rules (3, 5)	Adopted String Concatenation pattern immediately to handle potential overlapping rules cleanly.
Q2	Added Rule (7)	Extended the string concatenation logic to include the new divisor, proving the scalability of the initial approach.
Q3	Complex Rules (3, 4, 5, 7, 9)	Validated the robustness of the concatenation logic against a denser set of rules without needing structural changes.
Q4	Dynamic Rule Engine	Refactored into a Class-Based Design. Implemented a custom CustomFooBar class to allow dynamic rule injection, adhering to the Open/Closed Principle.

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🚀 Technologies

• Framework: .NET 10
• Language: C# 14 (preview/latest features)
• IDE: Visual Studio Code

Note on .NET 10: I utilized .NET 10 to leverage the latest performance improvements in the CoreCLR and string manipulation optimizations suitable for high-throughput backend services.

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🛠️ Installation & Execution

Since this project uses .NET 10, please ensure you have the appropriate SDK installed.

1. Clone the Repository

   git clone https://github.com/Gcaptz/Competency-Test_Fmlx.git
   cd Competency-Test_Fmlx

2. Restore Dependencies

   dotnet restore

3. Run the Application

   dotnet run

🧠 Architectural Highlights

For the final challenge (Question 4), I transitioned from a static imperative approach to an Object-Oriented design.

Key Features:

• Dynamic Configuration: The CustomFooBar class is agnostic of specific numbers or strings. It accepts rules via AddRule(int, string).
• Preserved Order: A List<(int, string)> is used instead of a Dictionary to ensure the output string sequence respects the order of rule insertion (e.g., "foo" must appear before "bar").
• Performance: Utilized StringBuilder for string composition to minimize memory allocation overhead during concatenation operations.

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_{Submitted for Formulatrix Engineering Talent Day - January 2026}