You will get your no-code or legacy app rebuilt by a Senior Full Stack Developer
Project details
No-code and legacy stacks are great until you outgrow them - then plugins, third-party services, and scattered data start blocking growth. As a senior full stack developer I rebuilt Kleta off its old WYSIWYG stack into a custom Next.js and Node.js platform, consolidated scattered data into a single source of truth, and migrated 400+ users with only 4-5 hours of downtime. It scaled to 350+ customers and nearly $3M in Stripe payments before being acquired.
You will get your app rebuilt as a custom, owned, scalable full stack product - React/Next.js frontend, Node.js backend, your data migrated cleanly, and your integrations rebuilt properly. As your full stack developer I'll plan the migration to minimize downtime and hand you a platform with no vendor lock-in. You walk away with a custom app, migrated data, and full source code.
You will get your app rebuilt as a custom, owned, scalable full stack product - React/Next.js frontend, Node.js backend, your data migrated cleanly, and your integrations rebuilt properly. As your full stack developer I'll plan the migration to minimize downtime and hand you a platform with no vendor lock-in. You walk away with a custom app, migrated data, and full source code.
Programming Languages
HTML & CSS, JavaScript, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$2,600
|
Standard
$5,200
|
Advanced
$9,600
|
|---|---|---|---|
| Delivery Time | 20 days | 34 days | 50 days |
Number of Revisions | 1 | 2 | 3 |
Number of Pages | 5 | 12 | 20 |
Design Customization | - | - | |
Content Upload | - | ||
Responsive Design | |||
Source Code |
Frequently asked questions
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PB
Pius B.
Apr 4, 2026
Senior Full Stack Developer (PHP, Laravel, October CMS)
So great to work with Mat he is a fantastic communicator. Thanks for your help!
PB
Pius B.
Mar 24, 2026
Fullstack Developer Needed in Pakistan
Deltacron was a strong backend partner throughout the engagement. They took ownership, delivered clean and reliable systems, and kept things moving. Mat is extremely patient and always tries his best. It is very clear.
They improved how our backend and frontend communicated, which made a noticeable impact on performance: This is still in progress but so far very good!
What stood out most was their responsiveness. In a fast-moving startup environment, that level of ownership matters.
Dependable team. Strong execution.
One thing that could help them even more is to ensure that the talent matches the requirements. The talent is extremely good for their level (junior/senior) and for some tasks perhaps it requires too many parties to be involved to get clarity.
However I stronly believe that Mat and their team is excelling in this soon. I am looking forwards for the next wave of collaboration to finish the project.
They improved how our backend and frontend communicated, which made a noticeable impact on performance: This is still in progress but so far very good!
What stood out most was their responsiveness. In a fast-moving startup environment, that level of ownership matters.
Dependable team. Strong execution.
One thing that could help them even more is to ensure that the talent matches the requirements. The talent is extremely good for their level (junior/senior) and for some tasks perhaps it requires too many parties to be involved to get clarity.
However I stronly believe that Mat and their team is excelling in this soon. I am looking forwards for the next wave of collaboration to finish the project.
TE
Tarek E.
Feb 7, 2026
Full Stack Developer for Cost Forecasting Web App
Mateen and Yawar were fantastic to work with. They were extremely helpful, professional, and communicative throughout the entire process. They did an excellent job helping develop our Figma design and were always open to feedback and quick to make adjustments. I genuinely enjoyed working with them and would highly recommend them to anyone looking for reliable, skilled designers. I will definitely be referring them in the future and working with them again if I need any help
IC
Iulian C.
Dec 9, 2025
Shopify Expert Developer Needed (Mobile App)
BO
Ben O.
Jul 16, 2025
Full Stack Software Developer for Hybrid Fitness Application
The Deltacron team were great to work with and had great communication back and forth.
About Mateen
Full Stack Developer | Full Stack AI SaaS Developer | React.js Node.js
79%
Job Success
Islamabad, Pakistan - 1:53 pm local time
✅ One SaaS I rebuilt hit 350+ customers and ~$3M in funding, then was acquired
✅ Platforms trusted by SoftBank & Schneider Electric. I ship products that scale, not demos
For over 15 years, I've worked as a Full Stack Developer and SaaS Developer helping startups and enterprise companies design and build AI-powered, scalable SaaS platforms and high-performance backend systems. Products I've delivered span 200K+ end users and six venture-backed companies that have collectively raised over $5.8M in funding, with reports and platforms adopted by enterprises like SoftBank, Schneider Electric, and The Venture City. One product, Kleta, was acquired by Cooltra.
I primarily work on mid to high-ticket projects where urgency, scalability, and production reliability matter.
Here's what I deliver:
✔️ AI Integrations & LLM Systems: Full Stack Developer for AI SaaS (OpenAI, Claude, RAG) As a full stack developer for AI SaaS I've shipped 10+ LLM-powered features to production, including RAG and embeddings on my latest project, Caliper, and an AI experiment for the Max Planck Institute that drew 1,000+ participants and 20,000+ generated images.
✔️ Full Stack Developer for SaaS (React, Node.js, TypeScript, MongoDB, PostgreSQL) SaaS platforms I've built as a full stack developer have scaled to 350+ paying customers and processed nearly $3M through a single Stripe integration, and one MVP I delivered on a budget under $15K secured funding for a platform whose reports now reach enterprises like SoftBank and Schneider Electric.
✔️ System Architecture & Backend Engineering: Backend Developer & Node.js Developer As a Node.js developer I've rebuilt backend systems that lifted Lighthouse performance scores by 40%, delivering scalable architectures, RESTful APIs, database optimization (MongoDB, PostgreSQL), and AWS cloud deployment.
✔️ Frontend Engineering: React Developer & Next.js Developer Front-end revamps I've led as a React developer have increased user engagement by 40% and marketing efficiency by 20%, with responsive, high-performance interfaces and clean UX.
✔️ Data & Integration Systems: API Integration Specialist Complex data integrations, analytics tracking (PostHog, Google Analytics), CRM integration, and performance optimization for real-world web applications. It's only possible because of my full stack developer capabilities.
✔️ Development Workflow & Tooling Structured, version-controlled development ensuring maintainability, faster iteration, and long-term scalability.
✔️ Collaboration & Agile Delivery Efficient communication and delivery using Slack, ClickUp, Jira, or good ole GitHub Projects and structured agile workflows.
⭐ Recent Client Feedback
"Great communication and attention to detail. Planned carefully and delivered high-quality work. Would gladly work with Mateen again."
"Stayed on budget and delivered exactly what we needed. This was a repeat engagement and won't be the last. Highly recommended."
Let's start with a focused consultation. As your full stack developer I'll review your idea, identify risks early, and map out a scalable SaaS system built for real users.
Steps for completing your project
After purchasing the project, send requirements so Mateen can start the project.
Delivery time starts when Mateen receives requirements from you.
Mateen works on your project following the steps below.
Revisions may occur after the delivery date.
Plan: migration mapped to minimize downtime
I map your current no-code/legacy setup, plan the data migration and integration rebuilds, and agree a cutover that keeps downtime to a minimum.
Rebuild: custom app you own
I rebuild the core as a custom React/Next.js and Node.js app - no plugins or vendor lock-in - in cycles you can review.