Skills

What do I know,
and how well do I know it?

I don't like inflating my levels. Every level below is based on how much work I have actually shipped with that language.

What do these levels mean?

Advanced: The main language of the products I have shipped. I can solve a complex problem without opening the docs.
Proficient: I can build projects on my own; I check the docs for advanced topics.
Intermediate: I can ship working code, but it isn't my day-to-day language; I look things up now and then.
Learning: Actively learning. I use it in real projects, but I haven't gone deep yet.

Swift

Advanced

iOS & iPadOS apps and games. App Store release processes, UIKit/SwiftUI, App Store Connect.

Since 2021

WhereSocial Connect · Cepte Perakende · ArenaX · Mysterious Treasure

Java

Advanced

Android app development. My first apps published on the Play Store — the ones that generated revenue — were written in Java.

Since 2020

WhereMy first apps on the Play Store · app archive

Kotlin

Intermediate

The modern Android side. Migrating existing Java projects and writing new modules in Kotlin.

In active use

WhereSocial Connect · 2.El Bilet · migrating Android modules

Python

Intermediate

The language I started programming with. I used it with Raspberry Pi and Arduino to read sensor data, handle hardware–software communication and build alert flows. In my R&D work, the training side of the models that run on-device is Python as well.

Since 2018 · the language I started with

Where2019 TÜBİTAK earthquake early warning project · sensor circuits and GPIO · R&D model training plan

HTML5 & CSS3

Learning

I hand-coded every website I have delivered. I keep going deeper on grid, animation and accessibility.

In active use

Wheredemirtasdemir.com · Alliance Güvenlik · Dr. Doğan Uysal

JavaScript

Learning

The interaction, DOM, form and animation layer in my web projects. It gets deeper with every project.

Still learning

WhereThe entire interaction layer of this site · web projects

Flutter / Dart

Learning

iOS + Android from a single codebase. I started learning it in 2026 and I'm trying it out in my active projects.

Since 2026

WhereVakti Geçmeden · Hadi Yapalım · Sinepia

Firebase & Supabase

Proficient

The back end of my apps: authentication, database, real-time sync, cloud storage, server-side business logic and notifications.

In active use

WhereThe back end of every app I have published · Cepte Perakende

SEO & Digital Marketing

Proficient

Technical SEO, content strategy, ASO, social media management. I actively run SEO for 2 brands.

Since 2025

WhereSEO for 2 brands · the websites I have delivered

Design and content tools

CanvaAdvanced

App store graphics, social media content and presentation design.
CapCutIntermediate

App promo videos and short-form video editing for social media.
Adobe PhotoshopLearning

Image editing and app store screenshot templates. Still going deeper.

Development tools

Xcode
Android Studio
Visual Studio Code
Git & GitHub
App Store Connect
Google Play Console
Raspberry Pi
Arduino
WordPress

Back end & database

Firebase
Supabase
Firestore
PostgreSQL
Authentication
Cloud Storage
Push Notification
Realtime Database
Cloud Functions
Firestore security rules

Design & content

Adobe Photoshop
Canva
CapCut
UI/UX principles
App Store graphics
Social media design
Video editing

Marketing & growth

Technical SEO
Keyword research
Google Search Console
Google Analytics
ASO (App Store Optimization)
Social media management
Content strategy

Foreign languages

What's next

My goals for the period ahead

I wrote down where I stand exactly as it is; it felt right to write down where I want to go, too.

Advanced level in Flutter

I'm still learning it. My goal is to reach a level where I can ship to both platforms from a single codebase.

Going deeper in Python, Kotlin and JavaScript

I can ship with all three, but they aren't my day-to-day languages. I want to bring them up to the same level as Swift and Java.

English: B1 → C1

I read technical documentation comfortably. My goal is to reach C1, where I can speak fluently in an international team.

German: A2 → B1

I'm at elementary level. I aim to reach intermediate and be able to hold everyday conversations.

So where were these used?

Every skill above was learned inside real work

If you look at the list and think "fine, but what did he build with them?", the answer is here. Each section covers the work itself, the technologies I used and the problems I ran into, in detail.