Available

Senior Mobile &
AI Engineer

8+ years building production Android, Flutter & cross-platform apps used by millions of users. Kotlin Multiplatform expert. Now building AI-powered automation products with Python, LangChain & Claude API.

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About

The Engineer Behind the Product

Berlin-based senior mobile developer with 8+ years of production experience. My apps have reached over 1 million downloads serving millions across Algeria, Morocco, and Europe.

Deep expertise in Kotlin and Jetpack Compose — from Java XML migrations to full Kotlin Multiplatform architectures. Led modernization of a production app serving 100K+ users at one of Europe's largest petroleum companies.

Beyond mobile, I build AI-powered products — chatbots with Claude & OpenAI APIs, RAG pipelines, real estate automation, and SaaS platforms using Python and LangChain.

Kotlin MultiplatformJetpack Compose Flutter / DartKtor & GraphQL AI & LLMsPython Clean ArchitectureFirebase RAG PipelinesSaaS Dev
LOCATIONBerlin, Germany
RESIDENCYGerman Permanent Residency
AVAILABILITYImmediately Available
WORK TYPERemote · Hybrid · On-site
EDUCATIONBSc Computer Science
LANGUAGESEnglish · German (B2) · Urdu
EMAILhi@muhammadfahad.me
GITHUBFahadKhalid ↗
Experience

8 Years of Production Engineering

Smart Cargo · Slovenia
Android Developer — Contract
Jan 2026 – Apr 2026
  • Led Android development on a ride-hailing platform for one of Slovenia's largest energy companies
  • Refactored Kotlin codebase, resolved critical production bugs, implemented new product features
  • Wrote technical documentation for architecture patterns and developer onboarding
  • Collaborated with backend engineers and project managers in Agile environment
Digital Pearls UG
Lead Mobile & AI Developer
Jan 2025 – Present
  • Architected Kotlin Multiplatform (KMP) — shared business logic for iOS/Android with AI-powered features and real-time sync
  • Built SmartParchi — complete doctor appointment SaaS platform from frontend to deployment, independently
  • Built AI products: recipe app (Python + GPT-4 + Twilio WhatsApp), AI chatbot with Claude API streaming, RAG pipeline
  • Developing AI real estate lead qualification system targeting US markets
Yassir GmbH ↗
Senior Android Developer
Jun 2022 – Oct 2024
  • Scaled Yassir SuperApp to 1M+ downloads serving millions across Algeria, Morocco & Tunisia
  • 90% crash reduction · 70% complexity reduction · 85%+ test coverage (SonarQube) · 40% faster CI/CD
  • 4+ years shipping production Jetpack Compose — complex state-driven UIs with Flow/Coroutines
  • Led code reviews and mentored junior developers on Clean Architecture and SOLID principles
GK Software SE
Android Developer
Sep 2021 – Jun 2022
  • Built enterprise Android SDKs for Lidl & Aldi — Kotlin, Java, AndroidX at production scale
  • Firebase: Firestore, Authentication, Crashlytics, Remote Config
Greeny GmbH & Rechtag
Android & Flutter Developer (Working Student)
Dec 2020 – Aug 2021
  • Android app with MVVM / Clean Architecture at Greeny
  • Cross-platform Flutter app (iOS, Android, Web) at Rechtag
MeshTech Solutions ↗
Mobile Developer (Android & Flutter)
Jul 2016 – Sep 2019
  • Built and published 10+ apps on Play Store — native Android and cross-platform Flutter
  • REST APIs, payment integrations, real-time features; led junior developers
Interactive Cells
Android Developer
Mar 2015 – Jun 2016
  • E-commerce and restaurant apps — payment integrations, features, performance optimisation
Projects

Products Shipped to Production

Jan – Apr 2026
Petrol Ride-Hailing App
Led Android development on a ride-hailing platform for Petrol d.d., one of Slovenia's largest energy companies. Kotlin refactoring, critical bug resolution, feature delivery, technical documentation, close collaboration with backend and project managers.
KotlinJetpack ComposeMVVMRefactoringDocumentationAgile
Play Store
Yassir Driver App
Scaled ride-sharing driver app to 1M+ downloads across 3 markets. 90% crash reduction, 85%+ test coverage, Jetpack Compose, real-time Maps SDK.
KotlinJetpack ComposeFirebaseFlow/Coroutines
Live
SmartParchi SaaS
Doctor real-time appointment SaaS. Built independently — frontend, backend, database, deployment. Queue management, SMS, multi-clinic support.
SaaSHealthcareReal-timeFull-Stack
Live
Adab E-Commerce
Premium WooCommerce platform for modest fashion. Custom theme, payment integrations, SEO-optimized mobile-first responsive design.
WooCommerceE-CommerceSEO
AI Chatbot Platform
Production chatbot using Claude API — streaming responses, conversation memory, dynamic system prompts, RAG pipeline with vector store.
PythonClaude APIRAGLangChainVector DB
AI Real Estate Lead System
AI-powered lead qualification — LLM criteria extraction, listings querying, automated outreach campaigns targeting US markets.
PythonLLMsNode.jsAutomation
AI Recipe App
End-to-end AI recipe generation — Python + GPT-4 backend, WhatsApp delivery via Twilio, context-aware personalized outputs.
PythonGPT-4TwilioFastAPI
Play Store
MeshTech App Portfolio
10+ published Android & Flutter apps — e-commerce, utilities, restaurants. REST APIs, payments, full lifecycle delivery.
AndroidFlutterPlay StoreREST
Skills

Technical Arsenal

Android & Kotlin
KotlinJetpack ComposeJavaAndroidXMVVM / MVIClean ArchitectureFlow / Coroutines
Cross-Platform
Kotlin MultiplatformFlutter / DartiOS & AndroidShared Logic
Backend & APIs
KtorGraphQLREST APIsFirebaseNode.jsFastAPITypeScript
AI & Python
PythonLangChainClaude APIOpenAI APIRAG PipelinesVector DBsPrompt EngineeringPandas
Testing & Quality
Unit TestingTDDEspressoSonarQubeAI-assisted testingIntegration Tests
Tools & DevOps
GitGitHub ActionsFastlaneCI/CDDockerFigmaScrum / Kanban
AI Engineering

Building with AI, Not Just Using It

From RAG pipelines to production chatbots and automated lead systems — built end to end in Python.

Conversational AI & Chatbots

Production chatbots with streaming, memory, dynamic prompts and Claude/OpenAI fallback logic.

RAG Pipelines & Vector Search

Retrieval-augmented generation with Chroma, LangChain and semantic search for grounded responses.

AI Real Estate Automation

LLM criteria extraction, listings querying, and automated cold outreach targeting US markets.

Python & Prompt Engineering

Advanced prompt engineering, FastAPI backends, Pandas, and Jupyter for clean AI workflows.

fahad ~ python ai_chatbot.py
# Autonomous AI startup pipeline
import asyncio
from agents import AutonomousAgent
from browser import BrowserAutomation
from rag import MemoryStore
 
agent = AutonomousAgent(
  model="claude-sonnet-4",
  memory=MemoryStore(),
  autonomous=True
)
 
async def launch_startup():
  print("✓ Scraping competitor data...")
  print("✓ Generating React frontend...")
  print("✓ Building FastAPI backend...")
  print("✓ Running AI workflows...")
  print("🚀 Deployment successful")
Contact

Let's Build Something Together

Whether you need a senior Android engineer, a Kotlin Multiplatform architect, or want to build an AI-powered product — I'm immediately available for remote, hybrid, or Berlin-based roles.

Email
hi@muhammadfahad.me
LinkedIn
linkedin.com/in/iammfahad
GitHub
github.com/FahadKhalid
Location
Berlin, Germany · Open to relocation
Residency
German Permanent Residency
Kotlin
Python
KMM
AI
Flutter
RAG
Ktor
LLM
Automation
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