Marko Stupar

Software developer

I started writing code in June 2023.

Score 0

Two careers. Thirty seconds.

From the beat to the backlog

Space / ↑ jump · X smash (level 2)

approximately 7,696 hourshours

2.4 years professional · 1 year learning

Explore my work →Let's talk →

Time invested

Nobody was counting. So I counted.

Two hours a day after shift for the first year. Eight a day once someone started paying for it. Every number here is computed from today's date — nothing is written down by hand.

Learning2 h/day

approximately 792 hours

hours · 1 year

JUN 2023 — JUL 2024

Professional8 h/day

approximately 6,904 hours

hours · 2.4 years

JUL 2024 — TODAY

1,259 days since the first line of code

Story

Shift work, then code.

Police officer, then two hours a day after shift, then a first paid role. None of it happened quickly.

BEFORE 2023
Police Officer
Shift work, reports, and a lot of paperwork. I liked the job. I did not want to do it forever.
JUN 2023
First line of code
Two hours a day after shift, every day. Tutorials first, then small things of my own.
JUL 2024
Software Developer · Info Puls
First paid role. Learned what production actually demands from code.
JUN 2026now
Software Engineer · Atomic Solutions
Building and maintaining real systems, end to end.
TODAY
Still shipping
Eight production projects behind me. Still reading, still rewriting.

How I work

Three phases, one direction.

I learned to write code by hand before any of this was good. That order matters — it is the reason I can read what a model produces and know when it is wrong.

01
Written by hand
JUN 2023 — JUL 2024
No shortcuts. JavaScript, React, HTTP, SQL, Git — typed out one character at a time until the patterns stopped being magic. Two hours a day, after shifts, every single day.
02
AI as a tutor
JUL 2024 — 2025
First job, first real codebase, first bugs I could not explain. AI became the colleague who is always awake: explaining unfamiliar code, arguing about an approach, catching what I missed in review.
03
AI as leverage
2025 — NOW
The work moved up a level. I decide the shape of the system, an agent handles the typing, and I review every line before it ships. Faster, but nothing lands that I could not have written and cannot defend.

AI did not replace learning how to code. It changed how I use what I know.

Work

Eight real projects in production.

Mobile apps, an admin dashboard, a monorepo that serves both, and the packages they share. Each one runs for real people.

Blood Donation PlatformFull Stack Developer

KApp

A blood donation network used by transfusion centres across the Republic of Srpska.

Donors and transfusion centres in one place. The mobile app handles sign-in, donor profiles and appointments; a separate admin dashboard lets each centre manage its own calls for donors, appointments and support requests.

Expo
React Native
TypeScript
expo-router
Supabase
TanStack Query
Zod
Next.js
Tailwind CSS
i18next

View project →

What I built

Donor app for transfusion centres across the Republic of Srpska
Booking anchored to the centre that owns the appointment
Phone-based sign-in backed by Postgres row-level security
Push notifications for urgent calls for donors
Admin dashboard for calls to action, appointments, users and support tickets
Serbian in both Latin and Cyrillic scripts

Relocation PlatformFull Stack Developer

Tvoja Integracija

Everything someone needs to move to Germany and actually settle there.

A mobile app and an admin panel built as one Turborepo, sharing types and query code. Guides, chapters, city-by-city information, a business directory, consultation booking and a built-in e-book reader.

Expo
React Native
Next.js
TypeScript
Turborepo
Supabase
TanStack Query
Radix UI
Tailwind CSS
i18next

View project →

What I built

Expo app and Next.js admin in one Turborepo, sharing types and data fetching
Guides, chapters and city-by-city information for moving to Germany
Consultation booking, business directory and industry listings
Built-in EPUB and PDF reader for the e-book
Maps of cities and organisations — native maps on mobile, Leaflet on the web
Three languages: English, Croatian and German

Pharmacy E-CommerceFull Stack Developer

Moja Apoteka

A pharmacy storefront on mobile, wired straight into a live WooCommerce catalogue.

Expo
React Native
TypeScript
expo-router
WooCommerce
TanStack Query
Zustand
Orval
i18next

View project →

Social App for Dog OwnersFull Stack Developer

Maza

A social network for dog owners — profiles, meetups, places and training.

Expo
React Native
TypeScript
expo-router
Supabase
TanStack Query
Branch
Google Places
Lottie
Firebase Analytics
i18next

View project →

Online Casino & BettingFull Stack Developer

zesty.bet

An online casino and betting platform built to stay responsive under load.

View project →

Social NetworkFull Stack Developer

Iwaaant

A social network platform built end to end.

View project →

Networking PlatformWeb & Mobile Developer

RU4M

An AI-driven event and professional networking platform.

View project →

Coupons AppMobile Developer

eKuponi

E-coupons for PlayStation and PC gamers.

View project →

Client websites

Live sites for local businesses in Banja Luka, designed, built and shipped end to end.

Van transport & moving

Kombi Prevoz Damjanović

Moving, furniture and goods transport across Banja Luka and the rest of Bosnia and Herzegovina, with service pages and a quote request form.

Next.js
TypeScript
Tailwind CSS
Radix UI
React Hook Form
Zod
EmailJS

kombiprevozdamjanovic.com ↗

Custom furniture workshop

Namještaj Balerina

Made-to-measure kitchens, wardrobes, living rooms and office fit-outs, with a project gallery and free consultation requests.

Next.js
TypeScript
Tailwind CSS
Radix UI
React Hook Form
Zod
EmailJS

namjestajbalerina.com ↗

Crane truck services

Kamion Prevoz Dobrijević

Crane truck hire in Banja Luka: rubble removal, soil, gravel and sand delivery, crane loading and unloading, pallets and firewood.

Next.js
TypeScript

kamionprevozdobrijevic.com ↗

Stack

What I build with.

These are the tools I know well enough to pick up real work with from the first day, not just ones I have tried once.

Languages: TypeScript
JavaScript
SQL
HTML
CSS
Mobile: React Native
Expo
expo-router
React Navigation
Reanimated
FlashList
EAS
Web: React
Next.js App Router
Tailwind CSS
Radix UI
React Hook Form
Zod
Vite
Data & Backend: Supabase
Postgres + RLS
Deno Edge Functions
TanStack Query
Zustand
WooCommerce
WordPress REST API
Orval
Tooling & Quality: Vitest
Playwright
Maestro
pnpm
Turborepo
Git
Sentry
Firebase Analytics
i18next
Published Packages My own packages, published to npm under my Atomic Solutions scope. Shared config and UI used across the products above.: @atomic-solutions/react-native-ui
@atomic-solutions/react-ui
@atomic-solutions/react-supabase
@atomic-solutions/wordpress-api-client
@atomic-solutions/moja-apoteka-json-feeds

Process

Six steps, every time.

The same loop whether it is a bug report or a new product. AI sits inside it, not around it.

01
Understand
Read the existing code before touching it. Find out what the request actually means and who is affected when it changes.
aiAI maps an unfamiliar codebase fast: entry points, data flow, and the callers a change will reach.
02
Plan
Decide the shape of the change and where the boundaries sit. Small diffs that fix the root cause, not the report.
aiAI pressure-tests the approach — trade-offs, edge cases, and what breaks in six months.
03
Build
Write it. Match the code that is already there. No new dependency for something a few lines can do.
aiAI drafts the repetitive parts. The architecture and every decision in it stay mine.
04
Review
Read the diff as a stranger would. Look for the bug that only shows up on the input nobody typed yet.
aiAI is a second reviewer on every diff — good at the boring classes of mistake I stop seeing.
05
Test
Cover the money path: valid input, invalid input, boundaries, and the required fields. Run them before calling it finished.
aiAI writes the cases I would skip, and I check that the assertions test behaviour rather than the implementation.
06
Ship
Deploy, then watch it. A feature is not done because it merged — it is done because it works for the people using it.
aiAI helps read the logs and trace a report back to the line that caused it.

Contact

Let's talk.

No form, no scheduling widget. Email is fastest, and it reaches me directly.

Emailmarkostupardev@gmail.com

Phone+387 65 044 447

LinkedInMessage me there

GitHubCode and packages

CVPDF download

Software developer

Nobody was counting. So I counted.

Shift work, then code.

Police Officer

First line of code