Kaapo Hietala

Internship, full stack, Sep 2026 – Jan 2027

A customer portal where Symmetra publishes reports and client companies view and download them. I am building it on my own during my internship, from the user interface to the server and production.

• The admin creates client companies and users, sends single-use invite links and publishes reports as PDF and Excel files
• Customers only see their own company's reports and can filter them by year and month
• Backend with NestJS and TypeScript, PostgreSQL database through Prisma, frontend with React and Vite
• Session-based login, role-based access control, hashed passwords and rate limiting
• Runs in production as Docker containers on a virtual server, with scripted backups and automated end-to-end tests for the API

TypeScriptReactNode.jsNestJSSQLDockerGit

The code is not public.

School team project (5 people), mobile app, March – April 2026

A mobile app for playing darts. You can play against friends, and game data is saved so you can follow your progress.

• Built the game engine shared by the app's darts games: X01, Cricket, Around the Clock, Bob's 27 and a checkout drill
• Built the data transformations that turn saved games into charts of each player's progress
• Built with React Native and TypeScript, with users and game data in Firebase

TypeScriptReact NativeFirebaseGit

Open the code on GitHub

Course project

A Node.js and Express API that manages library and study register data in a MySQL database.

• CRUD routes for five resources: books, borrowers, students, courses and grades
• Routes and database models separated into their own files
• Parameterised SQL queries, database settings from environment variables
• Errors are returned as HTTP status codes, and the CRUD routes are tested with Postman

JavaScriptNode.jsSQLGit

Open the code on GitHub