Available for new projects • Riyadh & Remote • $40/hr

Hire Custom AI Product & Cross-Platform Mobile App Developer

I help businesses build custom AI applications that automate manual work, cut operational costs, and deliver instant answers to customers. I also build beautiful, high-performance cross-platform mobile apps for both Apple iOS and Google Android from a single codebase using Flutter.

Stack:
OpenAI & Claude
PgVector / Vector DB
RAG Pipeline
Autonomous Agents
Python
Flutter
Dart
iOS & Android
Supabase
M-01
99.4%
Document Search Precision
M-02
< 350ms
Semantic Search Speed
M-03
1 Codebase
Codebase Efficiency
M-04
Up to 80%
API Cost Reduction
Transformation Blueprint

Before & After Working Together

How your technical bottlenecks get converted into high-performance reliability.

Before Umar (Common Roadblocks)
AI chatbots making up false answers (hallucinating) and giving incorrect information to your customers.
Spending hundreds of hours on repetitive manual data entry, customer ticket routing, and document summaries.
Building separate mobile apps for iOS and Android costs double the money and requires two different engineering teams.
Runaway AI token costs and unpredictable monthly bills from API providers.
After Umar (Engineered Solutions)
I build strict Retrieval-Augmented Generation (RAG) pipelines that anchor every answer to your verified business documents with exact source citations.
I build autonomous AI agents that read emails, extract structured data, call internal APIs, and complete end-to-end workflows automatically.
I develop cross-platform mobile apps using Flutter that deliver 60 FPS native performance on both iPhone and Android from a single, easy-to-maintain codebase.
I implement smart semantic caching, prompt token compression, and small-model routing that reduces your AI API costs by up to 80%.
Engineering Workflow

The 4-Step Production Pipeline

A transparent, step-by-step roadmap from initial scope to live deployment.

2 to 4 Weeks for Custom AI Workflows & Mobile MVPs
Phase 01Data Ingestion & Chunking

Document Parsing & Embedding

Raw documents, PDFs, and database records are parsed into contextual chunks and converted into high-dimensional vector embeddings.

Text SplittersOpenAI text-embedding-3Metadata Indexing
Phase 02Vector Database & Semantic Search

Similarity Matching with PgVector

When a user asks a question, vector cosine similarity instantly retrieves the top relevant context snippets within 50 milliseconds.

PgVector / PineconeCosine SimilarityHybrid Search
Phase 03Strict Structured Output & Validation

LLM Reasoning & Tool Execution

The model analyzes the verified context and responds with strictly typed JSON schemas (Zod) or safely executes pre-approved backend tools.

GPT-4o / Claude 3.5 SonnetZod SchemaFunction Calling
Phase 04Cross-Platform Client Interface

Flutter Mobile & Next.js Web Sync

Results are streamed in real time to your cross-platform Flutter mobile app (iOS / Android) or web dashboard with instant local offline cache.

Flutter 3.xSupabase RealtimeSQLite Offline Storage
What You Receive

Production-Ready Deliverables

Everything built to production standards with documentation, tests, and clean Git commits.

Custom AI Knowledge Bases (RAG)

Transform your PDFs, manuals, and internal documentation into an intelligent semantic search system that answers questions accurately.

Vector SearchAccurate CitationsNo Hallucinations

Autonomous AI Agents with Tool Calling

Intelligent agents capable of booking appointments, looking up customer records, querying databases, and sending automated emails.

Tool CallingFunction CallingStructured Outputs

Cross-Platform iOS & Android Mobile Apps

Native-quality mobile applications built with Flutter and Dart, featuring smooth animations, offline storage, and biometric login.

FlutteriOS & AndroidOffline Sync

App Store & Google Play Publishing

Complete preparation, code signing, and submission assistance to get your app approved and live on the Apple App Store and Google Play Store.

App Store ApprovalGoogle PlayFast Review

Automated AI Workflows & Pipelines

Connect your CRM, email, and internal databases with custom Python microservices and n8n workflows for 24/7 hands-free operation.

Python Microservicesn8n AutomationZapier Integration

Cost Optimization & Semantic Caching

Reduce your monthly OpenAI and Claude API bills by caching repeated queries and using optimized, compact system prompts.

80% Cost CutRedis Semantic CachePrompt Tuning
Verified Case Study

Nexus AI Knowledge Base & RAG Pipeline

Client: Nexus AI Systems90% Cost Reduction & 99.2% Search Accuracy Across 100,000+ Documents

GitHub Profile

The Challenge

Customer support agents spent up to 25 minutes locating policy details across hundreds of lengthy PDF manuals, leading to delayed replies and high support payroll costs.

The Solution

I built an end-to-end enterprise RAG knowledge engine using Python, vector embeddings, and a custom automated n8n workflow. Support agents now receive exact answers with cited page numbers in under 2 seconds.

Verified Results

< 350ms

Response Time

90% Cost Cut

Cost Savings

99.2%

Retrieval Accuracy

Eliminated hallucinations through strict document ground-truth verification
Semantic caching that saved thousands of dollars in monthly API costs
Integrated smoothly into existing support ticketing software
Clear & Predictable Investment

Transparent Pricing. No Middleman Fees.

Work directly with a senior engineer. Full IP and code ownership from day one.

Dedicated Hourly Sprint
$40per hour

Great for AI prompt engineering, API integrations, and mobile updates

Work directly with an experienced AI and mobile developer to build custom tools, add LLM features, or improve your Flutter mobile app.

Direct 1-on-1 contact via WhatsApp, Slack, or Google Meet
Clean, typed code pushed daily to your repository
Prompt optimization to minimize monthly AI token fees
Native iOS and Android device testing
Transparent weekly time logs with zero hidden costs
Flexible sprints you can start or pause anytime
Popular for MVPs
Fixed Milestone Scope
$1,500+per product milestone

Great for complete RAG knowledge systems or cross-platform mobile apps

Fixed scope, guaranteed delivery date, and complete deployment to cloud servers or app stores.

Full system architecture plan and technical scope document
Vector database setup, document ingestion, and RAG pipeline
Cross-platform Flutter mobile app for both iPhone and Android
App Store and Google Play publishing assistance
100% intellectual property & source code ownership
Free 30-day post-launch warranty and bug fixes
Assurance & Answers

Frequently Asked Questions

Direct answers to questions founders ask before hiring.

I use an architecture called Retrieval-Augmented Generation (RAG). Instead of letting the AI guess from memory, the system first searches your verified business documents and provides the exact text as proof. The AI is strictly instructed to only answer using those facts and to cite the exact source document. If the answer is not in your documents, it honestly states that the information is unavailable.