// Danylo Kovalenko — 16 y/o developer, Zürich CH

I ship
real products.

8 iOS apps on the App Store. Three months and counting writing production code at Suisse Voice, a Swiss AI startup. Top 3% in an international hackathon. Full-stack and AI products built end to end — design, code, ship, market.

Currently studying at WISS technology school in Zürich, going deep on backend engineering.

SHIPPED // Flowline BellyCue Hearthkeep Nearlings NoSpendToday QR Studio

About

01 //

I'm 16, based in Zollikon near Zürich, and I've been building software since I was old enough to break it. Games first, then iOS apps, now full-stack and AI products. Everything on this page is designed, coded and shipped by me — no team, no templates.

The difference between me and most people my age with a portfolio: mine has real users and real revenue. Small numbers, real lessons — paywalls, App Store review, ASO, angry support emails, production deployments at a startup.

StatusOpen to work
LocationZollikon, Zürich
Age16
SchoolWISS Zürich (EFZ)
Apps shipped8
LanguagesEN · DE · UA · RU

Experience

02 //
2026 — NOW

Suisse Voice

Developer — Swiss AI startup

Voice-AI platform for businesses: an AI phone assistant that answers calls, books appointments and routes customers. My first role inside a real company — production codebase, code reviews, customers who notice when something breaks.

  • Telephony integrations with Asterisk, multi-environment Docker deployments
  • Self-service trial flow, usage limits, Stripe billing
2024 — NOW

Velnor Studio

Founder — independent product studio

My one-person studio for iOS apps — 8 shipped, each taken from idea to App Store solo: product design, development, paywalls, ASO, marketing sites, programmatic video ads.

ONGOING

WISS Zürich

Student — EFZ, technology school

Applied computer science. Hackathons on the side — 25th of 930 in an international hackathon with UniMatch, a university-matching platform.

Selected work

03 //
01 // APP
Flowline app icon

Flowline

iOS + macOS · AI day planner

Describe your day in plain English — "gym at 6, big meeting at 10" — and Flowline builds a realistic, time-blocked schedule around your calendar, energy and habits. Menu-bar focus timer, calendar sync, streaks, widgets.

SwiftUIAIEventKitWidgetKit
02 // PLATFORM

Suisse Voice

Web · built at Suisse Voice

AI phone assistant for Swiss businesses: answers calls, books appointments, routes customers. Full telephony stack, self-service trial with usage limits, Stripe billing, production Docker deployments.

PythonAsteriskDockerStripe
03 // APP
BellyCue app icon

BellyCue

iOS · health

Food-trigger finder for people with IBS and bloating. An on-device statistics engine correlates symptoms with foods eaten 2–72 hours earlier — the delay your brain can't track. Doctor-ready PDF export.

SwiftUISwiftDataStatisticsPDFKit
04 // APP
Hearthkeep app icon

Hearthkeep

iOS · wellbeing

Keeps people no-contact after a breakup: a warm streak you don't want to break, a rescue flow for the moment of urge, write-don't-send letters, a private journal. Fully local — no account, no cloud, no tracking.

SwiftUILocal-firstPrivacy
05 // APP
Nearlings app icon

Nearlings

iOS · couples

A cozy question-and-card game for couples, especially long-distance ones: answer playful decks together, keep a shared streak alive. Shipped with its own marketing site and App Store creative.

SwiftUIStoreKit 2Game design
06 // APP
NoSpendToday app icon

NoSpendToday

iOS · finance

Turns not buying things into a game. One of my first published apps — and the first that earned real subscription revenue. Its video ad was produced programmatically with Remotion.

SwiftUIStoreKitRemotion
07 // APP
QR Studio app icon

QR Studio

iOS · utility

QR-code generator and scanner with custom styling, history and one-tap actions. A small, finished, polished utility — shipped with in-app purchases and proper App Store screenshots.

SwiftUIAVFoundationStoreKit 2
08 // SAAS

PDFClarify

Web · Cloudflare

PDF analysis app running entirely on Cloudflare: Pages, D1 for data, KV for sessions, R2 for files. Custom session auth, an authenticated dashboard, an interactive product demo.

CloudflareD1 · KV · R2Next.js

Also built: UniMatch (international hackathon, 25th of 930) · the Velnor studio site · Flux (AI sprint planning) · Death Escape (game-jam game with cutscenes) · a custom Linux-based OS · 8 Unity game prototypes.

My story

04 //

I was born in Cherkasy, Ukraine. When I was three, my family moved to New York for a year, then back to Ukraine — to Lviv, where I went to Lyceum №28. That's where the obsession started: robotics kits, taking things apart, wanting to know how machines think.

After 4th grade we moved to London. That's where I wrote my first real code — Python at first, then Unity, where I disappeared for 100+ hours. Game development was my first taste of building something from nothing: physics, logic, art, sound — all of it yours.

At the end of my first Sek year we moved again — this time to Switzerland. New country, new language, new school. I drifted into web design for a while, but came back to serious programming quickly, because nothing else felt the same.

Then things accelerated. I entered a game jam and shipped a complete game with cutscenes. I joined my first hackathon and placed 56th out of 903. At the next one — an international hackathon — my team built UniMatch and finished 25th out of 930. Somewhere in between, I built a custom OS on the Linux kernel, just to understand what sits underneath everything.

Next I taught myself Swift and SwiftUI and started shipping to the App Store. My first apps got 100+ downloads and earned my first $8 of subscription revenue. Eight dollars sounds small, but it changed how I think: strangers paid for something I made alone. Since then I've built 8 iOS apps — including Flowline, an AI day planner, and BellyCue, a health app with an on-device statistics engine — published under my own studio brand, Velnor.

The biggest jump came when I joined Suisse Voice, a Swiss AI startup, for three months. My first time inside a real company: a production codebase, code reviews, deadlines, and customers who notice when something breaks. I worked on AI voice technology for businesses — telephony integrations, Docker deployments, features that had to ship. Three months there taught me more about real software engineering than a year of solo projects.

Today I live in Zollikon and study at WISS in Zürich, going deep on backend engineering — Python, FastAPI, PostgreSQL, and the infrastructure that holds products together. The goal hasn't changed since the robotics kits in Lviv: build things people actually use. I'm just getting better tools.

Stack

05 //
Apple
SwiftSwiftUISwiftDataStoreKit 2WidgetKitEventKit
Backend
PythonFastAPIPostgreSQLSQLAlchemyDocker
Web
TypeScriptNext.jsReactTailwindCloudflare
AI
LLM integrationAnthropic APIOpenAI APIVoice AI
Other
Unity · C#JavaFirebaseGitRemotionASO
06 // CONTACT

Ready to
build?

I'm looking for a junior developer role, internship or apprenticeship — backend, iOS or full-stack — in the Zürich area or remote. My inbox is open and I reply fast.