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mehmed@portfolio — bash — 120×38
mehmed@portfolio on ⎇ main $ whoami
Maljoki Mehmed — Full Stack Software Developer
📍 Vienna, Austria  ·  Available for Freelance

mehmed@portfolio $ cat stack.json | jq '.core[]'
"Java Spring Boot"  "Angular"  "React"  "PostgreSQL"
"Docker"  "CI/CD"  "REST APIs"  "Hibernate ORM"

mehmed@portfolio $ echo $CURRENT_STATUS
✓ 5+ years @ Porsche Informatik / VW Group · AI Dev · Open to contracts
mehmed@portfolio $
Open for Freelance Contracts — 2025

Enterprise-grade code.
Freelancer agility.

I'm Mehmed — a Full Stack Developer & AI Integration Engineer with 5+ years building scalable web applications and AI-powered systems for Porsche & Volkswagen Group. Now bringing that enterprise-level craftsmanship — and LLM expertise — to your project.

Java Spring Boot Angular React TypeScript PostgreSQL Docker CI/CD REST APIs Hibernate ORM Enterprise IAM OpenAI API LangChain RAG Pipelines Prompt Engineering

Who I Am

5+
Years of enterprise experience
2
Production systems delivered
15+
Technologies mastered
4
Languages spoken

I'm a Full Stack Software Developer based in Vienna, Austria, currently studying Software & Information Engineering at TU Vienna. My career has been shaped by demanding enterprise projects — from identity & access management systems for the Volkswagen Group to contract lifecycle platforms at Porsche Informatik — where reliability, clean architecture, and maintainability are non-negotiable.

As a freelancer, I bring that same rigour to your project, whether it's a greenfield application, a legacy modernization, or a missing backend service. I care deeply about code quality, documentation, and delivery — not just shipping features, but shipping them right.


Tech Stack

Battle-tested tools from real enterprise projects, not just tutorials.

Backend — Java
primary language
Spring BootHibernate ORM MavenJSF JUnitMockito REST APIs
🌐
Frontend
modern frameworks
AngularReact TypeScriptHTML5 CSS3JavaScript
🗄️
Databases
relational & nosql
PostgreSQLMySQL MongoDBSQL Query Optimization
🐳
DevOps & Tooling
delivery pipeline
DockerCI/CD LinuxShell GitPostman
🔬
Other Languages
academic & systems
CProlog Haskell
🤖
AI / LLM Engineering
production AI integration
OpenAI APIAnthropic Claude LangChainRAG Pipelines Prompt EngineeringVector DBs LLM Tool UseAI Agents
AI Dev Tooling
modern AI workflow
Cursor / CopilotClaude Code n8n / AutomationEmbeddings pgvectorStreaming APIs Python

Work History

Enterprise projects, real impact, production systems used by thousands.

Full Stack Software Developer
Porsche Informatik GmbH
Apr 2021 → Present
▸ Group Retail Portal — VW Group IAM
Java Spring BootJSF → Angular HibernateMySQL DockerCI/CD Enterprise IAM
  • Built and maintained Volkswagen Group's login/retail portal within its Identity & Access Management (IAM) ecosystem — ~1M users across ~30 modules, under a corporate-mandated 10-second worst-case response SLA, as part of an 11-person team.
  • Migrated legacy Java EE/JSF modules to Spring Boot and contributed to an ongoing JSF → Angular frontend migration.
  • Engineered modular Spring Boot backend services integrated with enterprise identity infrastructure, optimizing database operations for scale.
  • Authored technical documentation covering backend architecture and data models.
▸ AUDI Extended Vehicle
Java Spring BootReact
  • Built React-based frontend features for the AUDI Extended Vehicle product (~10K users), backed by Java Spring Boot services.
▸ Business Partner & Contract Management Platform
Java Spring BootAngular HibernatePostgreSQL DockerCI/CD REST APIsOpenAI API RAG / pgvector
  • Joined this greenfield platform from day one, contributing to architecture decisions alongside the lead architect; scaled it to ~100K users across ~10-15 modules with data synchronization to GRP, as part of a 6-person team.
  • Designed a scalable Spring Boot backend with secure REST APIs for partner management, contract versioning, and automated workflow notifications.
  • Built a responsive Angular frontend with dynamic data visualization and seamless backend integration.
  • Integrated Hibernate ORM with PostgreSQL for optimized query performance and complex entity relationships; ensured reliability through JUnit & Mockito test suites.
  • Containerized the application with Docker and established CI/CD pipelines, reducing deployment time significantly.
  • Introduced AI-assisted development workflows on own initiative — model selection, context/token reduction via indexing, story templates, and bash automation — adopted team-wide, cutting typical story turnaround from ~1 week to 2-3 days.
  • Integrated LLM-powered features (OpenAI API / Claude) for intelligent document summarization, contract anomaly detection, and automated data extraction — reducing manual review time by ~40%.
  • Built a RAG (Retrieval-Augmented Generation) pipeline using vector embeddings and pgvector to enable semantic search over contract documents.

Independent Projects

Beyond client work — products I've designed, built, and shipped end-to-end.

🔐
Vaultic
Founder & Solo Developer
Live on App Store & Google Play

Cross-platform asset-management app for tracking net worth across cash, gold, and crypto — with a built-in Zakat calculator.

React Native Cross-Platform iOS & Android

What I Offer

From single features to full applications — here's how I can help your project.

01 /
⚙️
Backend Development

Robust REST APIs and microservices in Java Spring Boot. Clean architecture, proper error handling, security, and thorough documentation — built to last.

02 /
🖥️
Frontend Development

Responsive, performant SPAs in Angular or React. Component-driven, well-structured UIs that communicate flawlessly with backend services.

03 /
🗄️
Database Design & Optimization

Schema design, migration strategies, and query optimization for PostgreSQL, MySQL, and MongoDB. Your data layer built for scale from day one.

04 /
🚀
CI/CD & Containerization

Dockerize your application and set up automated build, test, and deployment pipelines. Reliable delivery without the manual overhead.

05 /
🔍
Code Review & Refactoring

Fresh eyes on your existing codebase. I identify bottlenecks, security gaps, and tech debt — then fix them with clear, maintainable solutions.

06 /
📄
Technical Documentation

Architecture docs, API references, onboarding guides, and deployment runbooks. Your team deserves to understand what was built and why.

07 /
🤖
AI / LLM Integration

Embed AI into your existing stack — from OpenAI & Claude API integration to full RAG pipelines, AI agents, and intelligent automation. Production-ready, not just prototypes.


Academic Background

🎓
2016 → Present (ongoing)
BSc. Software & Information Engineering
Technical University of Vienna (TU Wien)
🏫
2011 — 2016
Matura (Abitur equivalent)
HTL Mödling — Higher Technical College

Let's Work Together

Ready to start a project?

Whether you need a new API, a full web application, or someone to rescue an existing codebase — I'm available for freelance contracts and happy to discuss your requirements in a quick call.

✉ Send me a message