Based in Cologne, Germany

Aseel Marwan Kheder

Full-Stack Web Engineering & Systems Infrastructure with German Compliance.

Production CRM architectures, containerised Docker deployments and high-conversion client web apps for businesses in the Cologne / Bonn / Düsseldorf area.

React 19 / Next.js Node.js & PostgreSQL Docker & Linux Ops GoBD & DSGVO Compliant

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About Me

From Hardware to Practical IT & Web Development

IT · 2026

Aseel M. Kheder Lead Full-Stack Web Developer & IT-System Engineer

About

My main strength is IT-Support, including hardware and software troubleshooting, system setup, and 1st / 2nd level support in real working environments (including ERP systems such as JTL-Wawi during my internship).

Working Approach

I start every task with clear requirements and a structured plan. I prefer simple, maintainable solutions over unnecessary complexity.

Architectural Reliability

Migrated a legacy ASP.NET / SQL Server system onto a modern relational stack — roughly 1,000 cases, 20,000+ documents and 19 GB of data — with referential integrity preserved end to end.

GoBD & DSGVO Compliance

Invoicing built against GoBD retention rules: immutable records, sequential numbering and granular audit logs. Role-based access keeps financial data scoped to the users allowed to see it.

Production Performance

Containerised Docker deployments behind Nginx on Linux VPS, with automated off-site backups, server-side image compression and Core Web Vitals kept in the green.

Skills

IT-Support, Hardware, Remote-Tools & Windows. Active Directory, Microsoft 365, Ticketing Systems & TCP/IP. Web development: HTML, CSS, JavaScript & PHP. Project experience: React, Node.js, TypeScript, PostgreSQL & Git. Languages: German, English, Arabic. Driver's license: Class B. Interests: Strength training, swimming.

IT-Support Windows AD / M365 TCP/IP HTML/CSS JavaScript PHP React Node.js PostgreSQL Git

Education & Experience

Roles, environments, and responsibilities — stacks, demos, and case studies are in Featured Projects below.

Experience

Freelance

Freelance Full-Stack Developer & IT Systems Support

AZ Consulting GmbH – Düsseldorf

Development and maintenance of an ERP/CRM system and the company website (React, Node.js, TypeScript, PostgreSQL). 1st/2nd-level support, user permissions, and hardware/software support.

Apr 2026 → Present

Internship

IT Technician Internship

Notebook Köln – Cologne

1st Level Support (PC, iOS, Android) and ERP support (JTL-Wawi). Hardware diagnostics, component replacement (RAM, SSD, batteries) & data transfer.

Jul 2025 → Sep 2025

Internship

IT Systems Electronics Internship

Mick Computer – Cologne

PC assembly, installation, and customer support.

Nov 2021 & Mar 2022 (approx. 2 weeks)

Education

School-Based Training

ITA — Information Technology Assistant

Rheinische Akademie Köln

Focus on IT & software development.

Aug 2023 → Jun 2026

Vocational School

Intermediate School Certificate

Hans-Böckler-Berufskolleg · Cologne

Aug 2021 → Jun 2022

Secondary School

Secondary School Certificate & Language Integration (BVB)

Peter-Ustinov-Realschule / IN VIA e.V. · Cologne

Apr 2017 → Jun 2021

Featured Projects

Technical deep-dives: application features, exact stacks, live sites, and the AZ CRM case study.

crm.az-consulting.de

FEATURED · 2026 AZ CRM · Internal

Lead Full-Stack Developer (solo-built project)

AZ Consulting GmbH CRM

Solo-built internal CRM — React, Node.js, PostgreSQL (Docker, Prisma). Replaced legacy ASP.NET / SQL Server in ~3 weeks. Structured migration, role-based API access, automated HiDrive backups. Full breakdown in the case study.

React Node.js PostgreSQL Docker Prisma

~3-Week Implementation

Structured Data Migration

Dual-Layer Strato HiDrive Backups

Role-Based Access Control

Read Case Study Private · Under NDA

nunagmbh.de

PRODUCTION · 2026 RCS · NUNA KFZ-MEISTERBETRIEB

Lead Full-Stack Developer (Production · 2026)

NUNA GmbH — Rheinland Car Service

Production marketing & conversion platform for a state-certified KFZ-Meisterbetrieb in Hürth / Cologne. Transactional Next.js App Router architecture with a 4-step booking funnel, local SEO foundations, dual SMTP email dispatch, and containerized VPS deployment.

Next.js React TypeScript Tailwind CSS Docker Nginx

                  
                  Multi-Step Booking Funnel — 4-step appointment intake with vehicle context & client-side HEIC compression
                

                  
                  Dual SMTP Engine — lean Nodemailer transactional dispatch (<25 KB Gmail safety guardrail)
                

                  
                  Local SEO & AutoRepair Schema — Schema.org JSON-LD, canonical routing & local search optimization
                

                  
                  Containerized VPS Deploy — standalone Next.js multi-stage build behind Nginx on Strato VPS
                

Live Site

az-zangana.de

PRODUCTION · 2026 AZ WEB · Public

Production marketing site

AZ Zangana Official Web Suite

Production marketing site for MPU counseling and legal practice in Düsseldorf. Fail-safe CRM state hydration, live Node/Nodemailer dual-dispatch contact and booking API, automated client auto-replies, and § 5 DDG / DSGVO legal synchronization.

HTML5 Vanilla JS Node.js Docker Nginx Tailwind

CRM Data Hydration — live master-data sync without static rebuilds

Dual-Dispatch Mailer — internal routing & client confirmations

Legal Compliance — synchronized § 5 DDG & DSGVO routes

Containerized Ops — Docker services behind Nginx TLS

Live Site

surprise-iq.com

S SECURE COMMERCE

Full-Stack Learning Project

Surprise! Store

Independently built e-commerce project: custom admin, 2FA, role-based access — practical security basics.

PHP MySQL Next.js Tailwind CSS

2FA Security (TOTP)

Custom Admin Dashboard

Role-Based Access Control

Live Site Source Code

auktionshaus-linz-amrhein.de

L B2B WEB

Frontend / UI Project

Auktionshaus Linz am Rhein

Corporate website with clear UI and a secure contact form for B2B inquiries.

Frontend Development UI/UX Secure Contact Form

Corporate UI/UX

Interactive B2B Showcase

Smooth Animations

Live Site Source Code

Get In Touch

Let's Connect

Have a role or project in mind? Send a short message — I reply personally.

REACH OUT

Open to opportunities

Full-Stack Web Development, IT-System Engineering, and freelance roles in Cologne / NRW or remote.

Cologne, Germany