Kotlin Real-World Projects (4 Portfolio Builds)

Why These Four

Each proves a hiring skill: language depth, backend APIs, mobile UI and full-stack delivery. Publish all on GitHub with READMEs and green CI.

Project 1: Expense CLI Tool

• Parse CSV expenses, group by category, print monthly reports.
• Proves: file IO, collections, data classes, argument parsing.

Project 2: Book REST API (Spring Boot + Kotlin)

• CRUD plus search, validation, H2 then MySQL, MockMvc tests.
• Proves: backend Kotlin, JPA, testing, CI pipeline.

Project 3: Notes Android App (Compose)

• Room database, ViewModel plus StateFlow, Navigation Compose.
• Proves: modern Android end to end.

Project 4: Multiplatform Stopwatch

• Shared timer logic, thin Android plus desktop UIs.
• Proves: Kotlin Multiplatform thinking beyond one target.

Key Points

• Document like a professional: setup, screenshots, API samples.
• Automate one project fully through CI.
• Demo the running app live in interviews.