Skip to content
Codivaro

Software studio in Karlsruhe

Software that runs.

Websites, apps and business software from Karlsruhe. From idea to running system, built by one engineer: Murat Sert.

Start a projectTry a live demo

Running at EFA Tankstellen · MARG · What clients say ↓

app/vorbestellen/[filiale]/order.ts
export async function placeOrder(filiale: Filiale, cart: Cart) {
  const slot = await pickupSlots(filiale).next(cart.wishTime)
  const payment = await paypal.capture(cart.total)  // PayPal oder Karte

  if (payment.status !== "COMPLETED") throw new PaymentError()

  const order = await db.order.create({
    data: { filialeId: filiale.id, items: cart.items, slot },
  })
  await printer.queue(order)   // Bon an die Theke
  await notify.staff(order)    // Ton im Admin-Panel
  return order
}
efa-bestellen.de
Terminal
✓ Compiled successfully
✓ Type check passed
✓ Routes: /vorbestellen/[filiale], /admin/*
✓ Deployed → efa-bestellen.de

I don't build websites that only look good. I build systems that take orders, process payments and take work off your team's plate every single day.

Selected work

Real systems. Real clients.

github.com/msertdev ↗
efa-bestellen.de

01 · Ordering system · Admin panel

EFA Tankstellen

Pre-ordering, online payment and QR table ordering for petrol-station bistros in Karlsruhe and Baden-Baden.

  • Next.js
  • PostgreSQL
  • PayPal
  • QR
kelyvaro.com

02 · Own product · AI SaaS

Kelyvaro

Finds matching jobs in Germany, rewrites the CV for each listing and prepares applications for approval.

  • Next.js 15
  • Supabase
  • Groq LLM
  • TR / EN
margnederland.nl

03 · Online shop · Netherlands

MARG

Bilingual shop for a Dutch bag label — editorial, calm, with WhatsApp service.

  • WordPress
  • Custom Theme
  • NL / EN
github.com/msertdev/nexora
NEXORA

04 · Open source · Self-hosted

NEXORA

Self-hosted project management: organizations, projects, issues, roles and roadmap — Apache-2.0.

  • Next.js 16
  • NestJS
  • Prisma
  • Docker

Voices

“Murat hat unser Vorbestell- und QR-System von der ersten Idee bis zum Live-Betrieb umgesetzt — inklusive Admin-Panel, Bondruck und Zahlungsabwicklung. Er versteht, wie ein Tankstellen-Bistro morgens um sechs wirklich funktioniert, und baut genau dafür. Zuverlässig, schnell erreichbar und immer einen Schritt voraus.”
ÜEÜmit EryılmazEFA Tankstellen
“Murat turned MARG from an idea into a shop that feels as considered as our bags. He handled everything — design, the bilingual setup, accounts and checkout flow — and explained every decision clearly. Working with him felt like having a technical co-founder rather than a contractor.”
GYGürsel YiğitMARG

Case study · EFA Tankstellen

From the till to the phone.

Full story →
EFA Tankstellen — Website
01 / 05
Website
  1. 01

    Website

    A clear home for three stations in Karlsruhe and Baden-Baden — opening hours, directions and one goal: pre-order.

  2. 02

    Ordering in seconds

    Pick a station, add snacks and coffee, choose a time, pay with PayPal or card. Done.

  3. 03

    Admin: orders

    The team sees every order live — table, time, amount, status. With sound alerts for new pre-orders.

  4. 04

    Admin: QR codes

    Every table gets its own QR code — as PNG, SVG or print-ready PDF table cards, four per A4.

  5. 05

    Mobile in store

    The whole dashboard works on the phone behind the counter, too.

Services

From websites to business software.

your-company.com
from 1 week

Website

Fast business site with SEO and legal pages. Built to bring in enquiries.

Learn more
your-shop.com

Your product

Demo-Shop

Add to cart
Shop

Online shop

Products, cart, payment, multilingual — like MARG.

Learn more
Orders · liveDemo
  • #200Table 3 · 2× coffee, croissantNew
  • #289Pickup 07:45 · Tarte flambéePaid
  • #288Table 1 · CappuccinoPaid
System

Ordering & booking system

Pre-orders, QR at the table, appointments, with its own admin panel — like EFA.

Learn more

Your app · now

Order #214 is ready

iOS · Android
Mobile

App development

iOS and Android from one codebase. For your customers or your team, connected to your system.

Learn more
Stock · overviewDemo
Item A-104128OK
Item B-22042OK
Item C-0315Reorder
Item D-51273OK
Software

Business software

CRM, inventory, orders and portals. One piece of software that fits how you work, instead of spreadsheet chaos.

Learn more
automation.run()Demo
› 14 new documents detected
AI

AI & automation

Read documents, sort emails, reconcile data. Traceable, not magic.

Learn more
TillAPIAccounting

› beleg_04810 received

› checked · booked ✓

Integration

Integrations & desktop

Connect till, shop and accounting. Desktop programs and modernising legacy software.

Learn more
web Next.js
api NestJS
db PostgreSQL
backup daily
Ops

Hosting & maintenance

Updates, backups, monitoring. On servers in Germany if you like.

Learn more
Let's build something.Start a project →

Industries

Built for your day-to-day.

HospitalityShorter queues. More revenue.Learn more Retail & brandsYour store. Open around the clock.Learn more Turkish businessesConsulting in Turkish. German-standard results.Learn more
Murat Sert
Murat SertFull-stack engineerKarlsruhe

About

Hi, I'm Murat.

I'm a software engineer and the founder of Codivaro in Karlsruhe. I build software from the database to the screen: websites and shops, iOS and Android apps, business software, integrations and AI automation.

What I build runs in real businesses: EFA's pre-order and QR system with payments and an admin panel, MARG's bilingual shop, plus my own products like Kelyvaro and open source like NEXORA.

I work solo and directly. You always talk to the person writing your code. No account managers, no hand-offs, no excuses.

Every layer, one person

  • InterfaceWebiOS & AndroidDesktop
  • LogicAPIsIntegrationsAI
  • DataPostgreSQLReportsMigration
  • OperationsHostingMonitoringBackups
Based in
Karlsruhe, BW
Languages
DE · TR · EN
How I work
Fixed price, weekly demos

Process

Four steps, no agency theatre

  1. 01

    Call

    30 minutes, free. Goal, scope, budget.

  2. 02

    Fixed price

    Clear quote, clear scope.

  3. 03

    Build

    Weekly check-ins — you click along.

  4. 04

    Live & cared for

    Launch, handover, and I stay reachable.

Process, quality & tech in detail

Open source & own products. What I build when no client is watching.

Kelyvaroats-boardsNEXORAgrounded-jsonkeepwatching

Questions

Frequently asked

What does a project cost?

It depends on scope. After a free 30-minute call you get a fixed price — in writing, no hidden costs.

How long does a project take?

A business website is usually live in one to three weeks. Shops, apps and business software take longer depending on features; you see progress every week.

Do you also build apps and business software?

Yes. Besides websites and shops I build iOS and Android apps, business software like CRM, inventory and customer portals, plus integrations and AI automation. You can try it in the live demos.

Do I own the software afterwards?

Yes. Code, content, domain and store accounts are yours. I hand everything over on request.

Do you handle legal pages, GDPR and cookies?

Yes. Every site ships with imprint, privacy policy and privacy-friendly tech — no unnecessary trackers.

Can I edit content myself?

Yes. Depending on the project you get a simple admin panel or CMS to manage texts, images, products and opening hours.

Do you only work in Karlsruhe?

No — I also work remotely, for example with clients in the Netherlands. Around Karlsruhe I'm happy to meet in person.

One call. 30 minutes. Free.

→

Contact

Let's build something.

Tell me in two sentences what you have in mind. I'll usually get back within 24 hours on working days with a first proposal.

  • ✓30 minutes, free. Goal, scope, budget.
  • ✓Clear quote, clear scope.
  • ✓Consulting in the language you think in.
Murat Sert

Murat Sert

Founder · Codivaro

CallMessage on WhatsApp

Reply usually within 24 hours on working days. I only use your details to reply, see Privacy.
Or email directly: info@codivaro.de