You will get a production-ready full-stack feature for your existing web app
Project details
I build reliable full-stack features for existing web applications, not isolated code that becomes difficult to maintain.
With 6+ years of professional engineering experience, I can take one clearly defined feature across the complete stack: frontend, backend, database, APIs, validation, permissions, testing, and deployment support.
This service is ideal when you need a dashboard, customer portal, admin workflow, authentication flow, payment feature, reporting module, API integration, onboarding experience, or another bounded product feature added to an existing application.
I begin by reviewing the codebase, requirements, business rules, and acceptance criteria. I then design the technical approach, implement the feature, test normal and failure paths, and deliver clean source code with practical handoff notes.
My focus is production readiness: secure access, responsive behavior, clear validation, maintainable architecture, reliable error handling, and software that fits your existing product rather than fighting against it.
Each order covers one primary feature. Package scope varies by complexity, screens, integrations, and backend requirements.
With 6+ years of professional engineering experience, I can take one clearly defined feature across the complete stack: frontend, backend, database, APIs, validation, permissions, testing, and deployment support.
This service is ideal when you need a dashboard, customer portal, admin workflow, authentication flow, payment feature, reporting module, API integration, onboarding experience, or another bounded product feature added to an existing application.
I begin by reviewing the codebase, requirements, business rules, and acceptance criteria. I then design the technical approach, implement the feature, test normal and failure paths, and deliver clean source code with practical handoff notes.
My focus is production readiness: secure access, responsive behavior, clear validation, maintainable architecture, reliable error handling, and software that fits your existing product rather than fighting against it.
Each order covers one primary feature. Package scope varies by complexity, screens, integrations, and backend requirements.
Programming Languages
JavaScript, Python, TypeScriptCoding Expertise
Performance Optimization, Security, DesignWhat's included
| Service Tiers |
Starter
$195
|
Standard
$495
|
Advanced
$995
|
|---|---|---|---|
| Delivery Time | 3 days | 6 days | 10 days |
Number of Revisions | 1 | 1 | 2 |
Number of Pages | 1 | 3 | 5 |
Design Customization | - | ||
Content Upload | - | - | - |
Responsive Design | |||
Source Code |
Optional add-ons
You can add these on the next page.
Additional Revision
+$75
Additional Page
(+ 1 Day)
+$125
Design Customization
(+ 1 Day)
+$150Frequently asked questions
About Ayaz
Senior Full-Stack AI Engineer | RAG, Agents, Automations & SaaS
Karachi Goth, Pakistan - 12:30 am local time
I help companies turn unfinished products, fragile prototypes, and disconnected workflows into reliable software that can actually be used in production.
I’m a senior full-stack engineer with 8+ years of experience, so I can work across the whole system instead of stopping when the project moves from frontend to backend, APIs, databases, integrations, or AI.
I can help you:
• Finish or rescue an existing SaaS product
• Turn an MVP or AI prototype into production-ready software
• Build RAG systems, AI agents, document assistants, and AI-powered products
• Add AI to an existing application without rebuilding everything
• Build internal tools, dashboards, portals, and workflow systems
• Fix or extend React, Next.js, Vue, Node.js, or Python applications
• Replace fragile automations when the workflow needs real custom engineering
Selected work
HR SaaS Platform
Built and helped lead the technical direction of a self-service HR platform for a German company, replacing a staff-heavy process with a customer-facing product that let HR teams create and launch recruitment campaigns themselves. The platform became a core part of the company’s offering, supported customer retention and renewals, and the business quickly grew to around $1M in monthly recurring revenue.
Darvesh AI — Custom RAG Platform
Built a full-stack RAG application over roughly 6,000 source documents using a custom Python retrieval engine. The platform delivers grounded answers with inline citations, exact source passages, full articles, conversational memory, chat history, and controlled sharing. In my testing for this use case, it delivered faster and more relevant answers than the Google Vertex AI and Morphik implementations I tested.
What you get
You don’t need one freelancer for the frontend, another for the backend, another for AI, and someone else for automations.
I can work across the complete system:
Frontend: React, Next.js, Vue, JavaScript, TypeScript
Backend: Node.js, Python, REST APIs, webhooks
AI: RAG, LLM applications, AI agents, custom retrieval systems, LangGraph, vector databases
Data: Firebase, relational databases, authentication, structured data systems
Automation: n8n, Make, Zapier, APIs and custom integrations
The goal is simple: build software that works reliably for your users and your business, not just something that looks impressive in a demo.
If you already have something built, send me what you have and where you’re stuck.
If you’re starting from scratch, tell me what the product needs to accomplish.
Steps for completing your project
After purchasing the project, send requirements so Ayaz can start the project.
Delivery time starts when Ayaz receives requirements from you.
Ayaz works on your project following the steps below.
Revisions may occur after the delivery date.
Review the codebase and confirm feature scope
I review the existing application, requirements, technical constraints, and acceptance criteria. I identify dependencies or scope risks before development begins.
Design the technical approach
I define the frontend, backend, database, API, permissions, validation, and integration changes required to deliver the feature reliably.