Kuopio, Finland Matrix42

Jonathan F. Mertanen

Full Stack Developer

Information Systems Engineer & Web Enthusiast

I build modern web experiences with passion and precision. From robust backends to pixel-perfect frontends, I craft digital products that make a difference.

Section 01

Where I've
Worked

Matrix42

Software Engineer

Kuopio, Finland
Current · 4 years

Valannia

Team Lead & Head of DevOps

Remote
Current · 2 years

The Cloud Gate S.L

Full Stack Developer

Granada, Spain
3 years
Looking for new challenges and horizons
Section 02

Type
Specimen

A catalog of technologies and tools I work with.

Angular React React Native TypeScript JavaScript Node.js Next.js Astro HTML CSS Java MongoDB C++ PHP WordPress Git Google Cloud Tailwind CSS PostgreSQL
Section 03

Areas of
Interest

01

Frontend Development

My core focus and passion. I thrive on building intuitive interfaces and crafting experiences that genuinely help users.

02

UI/UX Design

Beyond writing code, I love exploring design trends, prototyping ideas, and refining the intersection of aesthetics and usability.

03

Backend Architecture

The backbone of every great frontend. I enjoy designing APIs, connecting services, and seeing the full stack come together.

04

AI & Agentic Code

From leveraging LLMs for development workflows to building AI-powered agents, I explore how artificial intelligence reshapes the way we write and ship software.

05

Cloud & DevOps

From CI/CD pipelines to cloud infrastructure, I embrace the tools that streamline development and accelerate delivery.

06

Emerging Technologies

Technology evolves constantly, and so do I. I actively seek out new tools, frameworks, and paradigms to stay ahead of the curve.

Section 04

Selected
Works

Type Content Platform
Role Full Stack Developer
Stack
Next.jsTypeScriptPatreon APIOAuth

Pledgy

01

Content delivery platform for Patreon with seamless integration, OAuth authentication, and subscription-based item delivery management. Enables creators to manage and distribute digital content to their patrons effortlessly.

Visit Project →
Type Cloud Tool
Role Full Stack Developer
Stack
ViteReactTypeScriptClerkS3

S3Client

02

S3-compatible cloud storage client with Clerk authentication. Provides a Google Drive-like interface for managing S3 instances, enabling intuitive file upload, download, and organization across buckets.

Type Landing Page
Role Frontend Developer
Stack
ViteBunTypeScript

Bastet Landing

03

Landing page for a Patreon profile of a 3D sculpt STL creator, featuring an Egyptian-inspired thematic design with immersive visuals and a bold aesthetic.

Visit Project →
Type SaaS Platform
Role Full Stack Developer
Duration 3 years
Company The Cloud Gate S.L — Granada, Spain
Stack
JavaGoogle CloudAngularTypeScript

Plenion

04

SaaS platform integrating cloud functionalities from Microsoft and Google into Plenion systems. Built an API in Java and Google Cloud alongside a customer-facing web portal in Angular.

Type Music Platform
Role Full Stack Developer
Stack
Next.jsStrapiReactNode.js

Bedroom Radio

05

Music platform bringing visibility to emerging Hispanic artists. Built with Next.js for the frontend and Strapi CMS for content management, featuring real-time playlist streaming.

Visit Project →
Type Portfolio
Role Full Stack Developer
Stack
Next.jsVercelCMS

Amai Takahashi

06

Portfolio for a 3D digital sculptor showcasing designs and creations for 3D printing. Static site built with Next.js, deployed on Vercel with CI/CD via GitHub.

Visit Project →
Type Game Server
Role Full Stack Developer
Stack
Node.jsReactJavaScript

GTA V Private Server

07

One of the biggest Spanish GTA V Roleplay communities. Developed a private roleplay server with a Node.js backend and React UI rendered in a Chromium embedded instance within the game.