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Hi, I'm Ozan Ramazan Kalkan I build |

Full Stack Developer with 10+ years crafting enterprise SAP systems, SaaS products, and security tools. Based in Sofia, Bulgaria.

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<about>

Who I Am

I'm a Full Stack SAP Developer who turns complex enterprise challenges into elegant solutions.

With over a decade in the SAP ecosystem — ABAP, UI5/Fiori, OData, S/4HANA, RAP, BTP — I've built systems for some of the world's largest enterprises including Schwarz IT, IGDAS, ESAN, and Anadolu Agency. Beyond enterprise, I build independent SaaS products and explore the bleeding edge of security research. On the side, I also tinker with native iOS apps as a hobby.

My philosophy is simple: code should feel obvious in hindsight. No over-engineering, no clever tricks — just clean, maintainable solutions that solve real problems.

                                
                                Enterprise SAP
                                S/4HANA, Fiori, ABAP, OData

                                
                                Web & SaaS
                                TypeScript, React, Node.js

                                
                                Security Research
                                Pentesting, CTF, Ethical Hacking

                                
                                SaaS Products
                                Fira, Orklabs

ork@macbook ~

$ whoami

ozan.kalkan — full stack developer

$ cat skills.json | jq '.primary'

{
  "sap": ["ABAP", "UI5", "Fiori", "OData", "S/4HANA", "RAP", "BTP"],
  "web": ["TypeScript", "React", "Node.js"],
  "security": ["Pentesting", "CTF", "OWASP"],
  "hobby": ["Swift", "SwiftUI", "iOS"]
}

$ uptime --experience

10+ years and counting...

$ _

Career Path

Senior Full Stack SAP Developer

SAP Germany — Remote

Went solo. Now building directly for SAP on contract — full stack ABAP, Fiori, RAP, and S/4HANA. No middlemen, just code and delivery.

ABAP Fiori S/4HANA RAP

Senior Full Stack SAP Developer

Schwarz IT — Sofia

5 years powering Europe's largest retailer. Native HANA, RAP, BTP, Neo-to-CF migrations — if it ran on SAP, I probably built or broke it. Moved to Sofia for this one.

ABAP Fiori S/4HANA BTP RAP

SAP Full Stack Developer

Innova — Istanbul

Jumped between IGDAS, ESAN, Eczacibasi, and Alarko Carrier — building custom Fiori apps, extending standard CRM, and wiring up OData services across industries.

UI5 OData CRM Fiori

Junior ABAP Developer

Regna SAP Consultant — Istanbul

Where it all started. Anadolu Agency, Milli Emlak, Carrefoursa — CRM, ABAP reports, service integrations. Learned fast, shipped faster.

ABAP CRM ALV

career --summary

$ git log --oneline --career

a1b2c3d SAP Germany — current mission
f4e5d6c Schwarz IT — 5 years, scaled to millions
7a8b9c0 Innova — enterprise consulting
d1e2f3a Regna — where it all started

$ wc -l experience.log

10+ years of commits

$ cat status.txt

Open to new challenges ✓

$ _

Tech Arsenal

SAP Ecosystem

Enterprise-grade solutions in the SAP landscape

ABAP UI5/Fiori OData S/4HANA CDS Views RAP BTP Native HANA

Web Development

Modern full-stack web applications and APIs

TypeScript React Node.js REST APIs PostgreSQL Playwright

iOS (Hobby)

Side projects built for fun

Swift SwiftUI MVVM Core Data

Security

Offensive security, penetration testing, and CTF

Pentesting OWASP CTF Burp Suite Network Security Python

DevOps & Tooling

CI/CD pipelines, automation, and infrastructure

Git GitHub Actions Docker Jenkins Shell Linux

Test Automation

End-to-end testing for SAP and web applications

Playwright Jest UI5 Testing SAP CBTA Fira

Featured Work

Featured

Fira

Multi-tenant SaaS test automation platform for SAP Fiori/UI5 applications. Playwright-powered, visual recorder, CI/CD ready. The modern alternative to Tricentis Tosca.

Node.js TypeScript Playwright React PostgreSQL

Live Demo

SAP Enterprise Projects

Custom Fiori applications, OData services, CDS views, and ABAP development for Schwarz IT, IGDAS, ESAN, 2BM, Andel, Eczacibasi, Anadolu Agency, and more.

ABAP UI5/Fiori OData S/4HANA CDS

Case Studies

Security Tools

Custom penetration testing tools, vulnerability scanners, and CTF solutions. Network analysis and OWASP compliance testing.

Python Bash Burp Suite Nmap Wireshark

GitHub

Let's Connect

Got a project in mind? Need SAP expertise? Want to discuss security? I'm always open to interesting conversations and new challenges.

Email [email protected]

GitHub @orkalkan

LinkedIn /in/ramazankalkan