AI & Full Stack Product EngineerAvailable for hire

I build AI products,SaaS platforms & MVPs.

Elite product engineer for founders and teams who need production systems — not prototypes. AI applications, full-stack SaaS, MVPs, and automation — shipped with clarity, speed, and long-term maintainability.

AI Engineer
Full Stack Engineer
SaaS Builder
MVP Specialist
Automation Expert

Top Rated PlusFreelancer on Upwork
ProvenDelivery record
Long-termClient relationships

Next.js
React
Node.js
TypeScript
AI / LLM

Start a project View projects View Upwork profile

Upwork freelancer: Top Rated+; Upwork freelancer
Years in production: 5+; Years in production
Core specialty: AI · SaaS; Core specialty

Portrait of Sajjad Karim, AI and full stack product engineer

AI PlatformMother of PeaceGPT-powered spiritual community

SaaSStart VisualPortfolio platform for creatives

Web3Clarify DAONFT marketplace experience

AI · SaaS · MVP

Work

Production systemsclients rely on.

From SaaS platforms to enterprise tools and high-volume delivery pipelines — each project started with a business problem and ended with shipped, scalable software.

Featured case studyFull Stack Developer · SaaS

Full Stack Developer

Start Visual

Portfolio SaaS for creatives and agencies

A subscription platform that lets creatives and agencies launch polished portfolio sites without wrestling complex tooling — beautiful templates, fast setup, and a product experience that matches the quality of the work being showcased.

Problem: Creatives and small agencies needed portfolio sites that looked premium — but existing tools were either too generic, too complex, or required developers to maintain.
Solution: Built a full-stack SaaS with customizable templates, intuitive content management, and a responsive frontend designed for visual-first brands.
Impact: Enabled professionals to launch branded portfolio experiences in hours — reducing time-to-market and elevating perceived quality for their own clients.

Product model: SaaS; Product model
Customizable: Templates; Customizable
In production: Live; In production

React
Node.js
Express
MongoDB

Visit product

Case study

How Start Visual was built

From problem to impact — the condensed product journey.

01
Problem
Portfolio tools were either too generic or too complex for creative professionals who needed speed and polish.
02
Research
Analyzed competitor flows, identified gaps in customization, and mapped the minimum viable template system.
03
Architecture
React SPA with Express REST API and MongoDB for user content, templates, and subscription logic.
04
Development
Template engine first, then customization layer, then deployment pipeline for client sites.
05
Challenges
Balancing flexibility for creatives with simplicity for non-technical users.
06
Result
Launch-ready SaaS with customizable portfolio templates and a polished product experience.
07
Impact
Creatives ship professional portfolio sites in hours instead of weeks.

Production at scaleFrontend Developer · Real Estate

300+ Twilio A2P Campaign Approval Websites

High-volume A2P compliance websites for real estate

Designed and delivered 300+ production websites for the real estate industry — each built to support Twilio A2P campaign approval workflows with consistent quality, responsive layouts, and rapid deployment.

Websites delivered: 300+; Websites delivered
Compliance-ready: A2P; Compliance-ready
Real estate: RE; Real estate

Fast production workflow
High visual consistency
Modern responsive development
Deployment automation

Problem: Real estate businesses needed compliant, professional web presences at scale to satisfy Twilio A2P campaign approval requirements — manual one-off builds couldn't keep pace with demand.
Solution: Engineered a repeatable production workflow: modern responsive templates, standardized content patterns, and deployment automation that maintained quality across hundreds of unique brand identities.
Impact: Delivered 300+ live production websites with high consistency, fast turnaround, and a workflow that scaled without sacrificing craft.

Next.js
React
Tailwind CSS
Vercel
JavaScript

Representative examples

300+ similar production websitesDelivered with the same workflow, quality bar, and deployment pipeline.

Full Stack Developer·Internal Product

iDigital

AI-powered employee & driver management

An internal enterprise platform for secure employee and driver document management — with automated expiration tracking, compliance alerts, and role-based access control.

Architecture: Enterprise; Architecture
Workflows: AI; Workflows
Access control: RBAC; Access control

AI-powered workflows
Document automation
Compliance alerts
Secure management
Responsive UI

Problem: Operations teams struggled to track document expirations, compliance status, and role permissions across employees and drivers — spreadsheets and manual checks created risk and wasted time.
Solution: Built a full-stack management system with AI-assisted workflows, automated expiration alerts, secure document storage, and granular role-based access — wrapped in a responsive, operator-friendly interface.
Impact: Centralized document lifecycle management with proactive compliance alerts — reducing manual overhead and operational risk for internal teams.

React
Next.js
Node.js
MongoDB
Tailwind CSS
JavaScript

Frontend Developer·Live

Clarify DAO

NFT marketplace experience

Frontend development for an NFT marketplace — modern architecture, responsive UI, and product-focused flows that make Web3 interactions feel intentional and accessible.

NFT marketplace: Web3; NFT marketplace
All devices: Responsive; All devices
Production: Live; Production

Modern frontend architecture
Web3 / NFT experience
Responsive UI
Product-focused development

Problem: The product needed a frontend that could communicate trust and clarity in a Web3 context — without the cluttered, confusing patterns common in early NFT platforms.
Solution: Built responsive marketplace interfaces with clean information hierarchy, wallet-aware flows, and a product-first approach to NFT discovery and interaction.
Impact: Delivered a polished marketplace frontend that elevated the product's credibility and usability for collectors and creators.

React
Next.js
Web3
JavaScript
Tailwind CSS

View product

More work

Additional products shipped

Selected projects from the broader portfolio.

AILive
Full Stack Developer
Mother of Peace
GPT-powered spiritual community platform
An AI-native social platform combining intelligent chat, community features, and gamified engagement.
- Next.js
- MongoDB
- RTK
- GPT
- +1
View product →GPT-4 · AI engine
BackendPrototype
Full Stack Developer
Ninfa
Backend architecture for a product prototype
REST API development and admin panel for a product prototype with frontend team integration.
- Node.js
- PHP
- React
- Bootstrap
- +2
View product →REST · API design

Ready to build your next product?

Whether it's an MVP, SaaS platform, or enterprise system — let's scope it clearly and ship with confidence.

Start a project View experience

About

Problem solver first.Product engineer always.

I help founders and businesses turn complex ideas into production software — AI platforms, SaaS products, and MVPs built with a business outcome in mind, not just clean code.

Problem solver
Every engagement starts with the business problem — who it serves, what breaks today, and what success looks like after launch.
Product thinker
I translate that problem into scoped product decisions: what to build first, what to defer, and how the experience should feel in the hands of real users.
AI-first developer
Modern AI workflows accelerate research, scaffolding, and iteration — but the engineering still has to be production-grade, secure, and maintainable.
Business-focused engineer
The goal is never a feature list. It is a shipped system clients can trust — on Upwork, in production, and over the long term.

How I partner

Direct communication, clear milestones, and software you can grow on — whether you need an MVP validated fast or a SaaS platform built to scale.

Portrait of Sajjad Karim — Sajjad Karim
AI & Full Stack Product Engineer

Journey

How I got here

A path shaped by curiosity, craft, and continuous growth.

2019
Foundation
Learned to build on the web — obsessed with craft, performance, and how products feel.
2021
Production frontend
Shipped React applications in professional teams with real users and deadlines.
2022
Client delivery
Full-stack ownership for international clients on Upwork and direct engagements.
2024
AI & SaaS
Built intelligent platforms, subscription products, and automation-heavy workflows.
Now
Product engineering
Partnering with teams who need a reliable engineer to ship and stay accountable.

Expertise

What I bring to the table

Not a skill dump — a focused set of capabilities I apply to every product I touch.

Intelligence
AI Applications
LLM-powered features, intelligent UX, and AI-accelerated delivery pipelines.
Architecture
Full Stack Systems
Next.js, React, Node.js — cohesive architecture from database to deployment.
Products
SaaS Products
Subscription platforms engineered for retention, growth, and operational clarity.
Speed
MVP Development
Validate ideas quickly with production-ready foundations — not throwaway code.
Efficiency
Automation
Workflows and tooling that eliminate repetitive work and reduce delivery friction.
Credibility
Client Trust
Top Rated Plus on Upwork with a track record of long-term client relationships.
Quality
Performance
Core Web Vitals, optimized renders, and fast experiences by default.

Values

How I work

Outcomes over output
Features matter only when they move the business forward.
Ship with accountability
Clear updates, predictable delivery, production-ready code.
Long-term partnership
Built for maintainability — many clients return for the next phase.
Premium craft
Polished interfaces and engineering rigor, without unnecessary complexity.

Why teams trust me

Upwork credential: Top Rated Plus; Upwork credential
Years shipping products: 5+; Years shipping products
Remote client base: Global; Remote client base
Systems in market: Production; Systems in market

Experience

Trusted to shipproduction systems.

From Upwork engagements to in-house product work — every role sharpened how I scope, build, and deliver software clients rely on in the real world.

Scroll through the phases — each milestone marks a shift in how I think, build, and deliver.

Curiosity
Learning
Building
Client delivery

Curiosity2019 — 2021
Self-directed exploration
Independent
Discovering how the web works — from first HTML pages to interactive interfaces.
- HTML
- CSS
- JavaScript
- Git
Impact
Built foundational understanding of the DOM, responsive layout, and developer tooling.
Lesson
“Curiosity compounds — every small project teaches something the tutorials skip.”
- First interactive projects deployed
- Solid grasp of frontend fundamentals
LearningSep 2021 — 2022
Frontend Developer
Webloop
Professional React development — component systems, state management, and team workflows.
- React
- JavaScript
- CSS Modules
- REST APIs
Impact
Transitioned from hobby projects to production codebases with real users and deadlines.
Lesson
“Craft means consistency — patterns, reviews, and readable code matter as much as features.”
- Production React applications
- Component architecture patterns
- Agile team collaboration
BuildingJun 2022 — Present
Full Stack Product Engineer
Freelance · Upwork & Direct Clients
End-to-end product delivery for international clients — scoping, architecture, frontend, backend, and launch.
- React
- Node.js
- MongoDB
- Express
- Next.js
Impact
Delivered production systems for founders and businesses worldwide — earning Top Rated Plus on Upwork through consistent, long-term work.
Lesson
“Client trust is earned by communicating clearly and shipping what was promised.”
- Top Rated Plus on Upwork
- Multiple long-term client relationships
- End-to-end product delivery
Client delivery2024 — Present
Frontend Engineer
Reply Smart AI
Built 300+ Twilio A2P campaign approval websites for real estate wholesalers — alongside live chat support and frontend work for an SMS & voice platform.
- Next.js
- React
- Twilio A2P
- Live Chat
- JavaScript
- Tailwind CSS
Impact
Delivered high-volume A2P-compliant websites at production scale while keeping the Reply Smart AI platform fast and intuitive for wholesale teams running SMS and voice outreach.
Lesson
“High-volume delivery and product UX share one bar — speed in production cannot come at the cost of clarity for operators.”
- 300+ A2P campaign approval websites
- Live chat support implementation
- Production frontend for SMS & voice workflows

Highlights

What this journey produced

Measurable outcomes and capabilities — not buzzwords.

Top Rated+
Upwork
Verified platform credential with a strong client satisfaction record.
5+
Products shipped
From client deliverables to independent SaaS and AI platforms.
End-to-end
Delivery
Database to deployment — one engineer, complete ownership.
AI-native
Development
Modern workflows with Cursor AI and Claude for faster, smarter builds.

Open to work

Ready to build your next product.

Whether you need an MVP validated, a SaaS platform scaled, or AI integrated into an existing product — let's scope it clearly and ship with confidence.

AI Products
SaaS Platforms
MVPs
Automation

Technology

An ecosystem built forshipping products.

Technologies are tools — the real skill is knowing how they connect. I architect full-stack products with an AI-first workflow and a product engineer's mindset.

Organized by engineering domain — each cluster represents a layer of how I think, build, and ship.

Frontend
Backend
AI
Architecture
Performance
Product

Ecosystem

Capability map

Technologies grouped by how they serve the product — not alphabetically.

Core

Product Engineering

Full-stack · AI-first · User-centered

Frontend Engineering
Component systems, state management, and premium interfaces at scale.
- React
- Next.js
- TypeScript
- JavaScript
- Redux
- Tailwind
- Shadcn
Backend & APIs
Robust server layers with clean contracts between frontend and data.
- Node.js
- Express
- REST APIs
- GraphQL
Databases
Schema design, queries, and data modeling for production applications.
- MongoDB
- Firebase
- SQL
AI Development
LLM integration, intelligent workflows, and AI-accelerated engineering.
- Cursor AI
- Claude
- LLM Workflows
- Prompt Engineering
UI Engineering
Design systems, responsive layouts, and motion-driven user experiences.
- Figma
- CSS
- Material UI
- Accessibility
Architecture
Scalable MERN patterns, modular codebases, and maintainable abstractions.
- MERN Stack
- Component Design
- API Design
- Modularity
Performance
Speed as a feature — optimized renders, assets, and Core Web Vitals.
- Core Web Vitals
- Lazy Loading
- Code Splitting
- Caching
DevOps & Tooling
Version control, deployment pipelines, and reliable release workflows.
- Git
- Docker
- CI/CD
- Cloud Deploy
Automation
Eliminating repetitive work through scripts, tooling, and smart workflows.
- Build Scripts
- AI Assistants
- Workflow Automation
Product Strategy
Scoping, prioritization, and iteration driven by user outcomes.
- User Research
- MVP Scoping
- Iteration
- Analytics

AI-First Workflow

Engineering accelerated by intelligence.

AI isn't a shortcut — it's a force multiplier. I integrate LLM tools into every stage of development to move faster without sacrificing quality.

Cursor AI
AI-native IDE for rapid prototyping, refactoring, and code generation.
Claude
Deep reasoning for architecture decisions, debugging, and documentation.
LLM Workflows
Building products with embedded AI — chat, context, and intelligent UX.
Prompt Engineering
Crafting precise prompts for reliable, production-grade AI outputs.
Product Acceleration
Faster research, scaffolding, and iteration cycles on every project.

Workflow

How products get built

From idea to iteration — a disciplined pipeline that balances speed with quality.

01
Idea
Define the problem and user outcome.
02
Research
Validate assumptions and explore solutions.
03
Architecture
Design systems, data flow, and tech stack.
04
Development
Build with AI-assisted, test-driven iteration.
05
Testing
Verify functionality, accessibility, and edge cases.
06
Optimization
Performance, bundle size, and Core Web Vitals.
07
Deployment
Ship to production with confidence.
08
Iteration
Measure, learn, and refine continuously.

Strengths

Engineering maturity

Full-Stack Ownership
Database to deployment — one engineer, complete product delivery.
AI-Native Development
Modern workflows that leverage intelligence at every stage.
Performance-First
Speed and efficiency baked in, not bolted on after launch.
Product Thinking
Engineering decisions guided by user value and business outcomes.

Always evolving

Continuously expanding the toolkit.

Technology moves fast — I stay ahead by learning deeply, building constantly, and applying new tools where they create real value.

Advanced AI Integration
Edge Computing
System Design
Design Engineering

Work together

Have an ideaworth building?

Tell me what you're building — an MVP, SaaS product, AI application, or automation system. I'll respond with honest scope, timeline, and next steps. No pressure, no jargon.

What I help with

Services that drive results

MVP Development
Validate your idea with production-ready code — fast enough to learn, solid enough to grow.
SaaS Development
Subscription platforms built for real users, retention, and long-term maintainability.
AI Applications
Intelligent features and LLM workflows integrated into products people actually use.
Full Stack Engineering
One accountable engineer from database schema to deployed frontend.
Automation Solutions
Eliminate repetitive work with scripts, integrations, and smart workflows.
Hire for Ongoing Work
Long-term partnerships for teams who need a reliable product engineer on retainer.

Engagement

Who I work with

Flexible models — from one-off builds to long-term product partnerships.

Build
Startup Founder
From zero to launch — MVPs, pivots, and rapid iteration with clear milestones.
Partner
Agency
Dependable engineering partner for client deliverables you can stand behind.
Solve
Business Owner
Custom software that solves operational problems and pays for itself.
Hire
Upwork Client
Top Rated Plus freelancer — hire directly through Upwork or here.
Grow
Long-term Partnership
Embedded engineer for ongoing product evolution and feature delivery.
Advise
Consultation
Architecture reviews, technical audits, and honest second opinions.

Let's build together

Share your project goals — I typically respond within 24 hours with thoughtful next steps.

Hire me Hire on Upwork

Available for new projects

PKT (UTC+5) · Remote worldwide

Usually responds within 24 hours

Top Rated Plus
Verified Upwork credential with long-term client relationships.
Production-first
Shippable code, clear communication, and systems built to last.
Direct partnership
Work with me directly — no hand-offs, no surprises.
Business-aware
Engineering decisions tied to outcomes, not feature checklists.

Project inquiry

Tell me about your idea

Share a few details — I'll respond with next steps.

Other ways to reach me

Alternative contact

FAQ

Common questions

How quickly do you respond?

I aim to reply within 24 hours on business days. Share as much context as you can — it helps me give you a useful first response.

What types of projects do you take on?

MVPs, SaaS platforms, AI-powered applications, full-stack products, automation, and performance optimization — for founders, agencies, and growing businesses.

Can I hire you through Upwork?

Yes. I'm a Top Rated Plus freelancer on Upwork. You can start there or contact me directly — whichever you prefer.

What does working together look like?

Initial conversation → scope & timeline → proposal → sprint-based delivery with regular updates. Clear milestones, no surprises.

I build AI products,SaaS platforms & MVPs.

Start Visual

How Start Visual was built

Problem

Research

Architecture

Development

Challenges

Result

Impact

300+ Twilio A2P Campaign Approval Websites

iDigital

Clarify DAO

Mother of Peace

Ninfa

Ready to build your next product?

How I got here

Foundation

Production frontend

Client delivery

AI & SaaS

Product engineering

What I bring to the table

AI Applications

Full Stack Systems

SaaS Products

MVP Development

Automation

Client Trust

Performance

How I work

Outcomes over output

Ship with accountability

Long-term partnership

Premium craft

Self-directed exploration

Frontend Developer

Full Stack Product Engineer

Frontend Engineer

What this journey produced

Ready to build your next product.

Capability map

Frontend Engineering

Backend & APIs

Databases

AI Development

UI Engineering

Architecture

Performance

DevOps & Tooling

Automation

Product Strategy

Engineering accelerated by intelligence.

Cursor AI

Claude

LLM Workflows

Prompt Engineering

Product Acceleration

How products get built

Idea

Research

Architecture

Development

Testing

Optimization

Deployment

Iteration

Engineering maturity

Full-Stack Ownership

AI-Native Development

Performance-First

Product Thinking

Continuously expanding the toolkit.

Services that drive results

MVP Development

SaaS Development

AI Applications

Full Stack Engineering

Automation Solutions

Hire for Ongoing Work