Portfolio · 2026 · Finland

Olli Karejoki

I'm a fullstack developer building web products end-to-end, now going deeper into practical AI integration.

GitHub CV Email

01 — PortraitHelsinki · 2025

Stack

Skills

Languages

TypeScript
JavaScript
Python
C
C++

Backend

Node.js
PostgreSQL

Claude
Claude Code
Cursor

Frontend

React
Next.js
Tailwind CSS
Vite
Framer

Tooling

Docker
Git
Bash
Linux
Postman
VirtualBox

Languages

TypeScript
JavaScript
Python
C
C++

Frontend

React
Next.js
Tailwind CSS
Vite
Framer

Backend

Node.js
PostgreSQL

Claude
Claude Code
Cursor

Tooling

Docker
Git
Bash
Linux
Postman
VirtualBox

03 — Hive Helsinki2023 — 2025

About

From stage to stack

For most of my adult life I made my living as a professional musician. I retrained as a developer at Hive Helsinki, part of the 42 network, learning by building and shipping real projects instead of sitting in lectures. Now I work across the full stack building fast, well-crafted web interfaces, bringing a performer's sense of timing and polish to software.

02 — On stagePre-code era

SUPER PONG 3D

Arcade multiplayer Pong in 3D: Babylon.js gameplay, live WebSocket duels and matchmaking, tournaments, chat, and a friend system, with a neon cyberpunk UI built from custom SVG-clipped card shapes and glass panels. Frontend UI and design by me.

ReactViteBabylon.jsWebSocket

GitHub

Team of 4 · UI & Frontend · 2025

Power-up selection · try it

smaller_paddle

slower_paddle

bigger_paddle

faster_paddle

more_spin

01 / 05

DEAD LOOP

2nd Place — Supercell AI Hackathon (Hive Helsinki × Junction)

AI-driven murder-investigation game. OpenAI generates a new case each playthrough, and you interrogate AI suspects over WebSocket in real time, with the backend tracking suspicion scores and triggering clues as you dig deeper.

ReactViteWebSocketFramer Motion

GitHub

Team of 5 · Frontend UI & Graphics · 2025

CAM-01 :: interrogation preview

REC ●

CAM-01 :: INTERROGATION

02 / 05

LEADBASE AI

AI-powered B2B lead intelligence CRM for the Finnish market. Claude learns an ideal customer profile from your existing clients, translates it into Apollo.io search filters, and scores every prospect against an explicit rubric — each lead saved with fit signals, concerns, and a suggested outreach angle. Apollo-first search with Finland’s open YTJ registry as fallback.

Next.js 16SupabaseClaude APITailwind CSS

GitHub

Solo project · Full-stack & AI · 2026

03 / 05

APPLICATION GENERATOR

A personal job-application copilot: paste a posting (or its URL) and Claude drafts a tailored cover letter plus a CV rebuilt from my resume data, prioritized against that role’s ATS keywords. A second Claude pass critiques the letter against a scoring rubric and can rewrite it against its own feedback in a closed loop, and finished documents export as print-ready PDFs via a server-side headless-Chrome renderer.

Next.jsClaude APISupabasePuppeteer

Solo project · Full-stack & AI · 2026

04 / 05

FOUNTAIN RECORDS

Client website for a Helsinki-based record label and global production house. Built with Next.js 16 and Sanity CMS v5: full CMS migration from hardcoded data to custom schemas for artists, producers, news, and sync licensing — plus sticky artist profile layouts and an embedded Sanity Studio.

Next.js 16Sanity CMSTailwind CSSTypeScript

Full-stack development & Sanity CMS integration · 2026

05 / 05

Olli Karejoki

Skills

From stage to stack

SUPER PONG 3D

DEAD LOOP

LEADBASE AI

APPLICATION GENERATOR

FOUNTAIN RECORDS

Lets build something.