Open for new projects

I build AI SaaS products that ship.scale.convert.earn.ship.

Senior full stack developer for founders and agencies. From database architecture to payments to production deploys, I take your idea from spec to paying customers.

Start a projectSee selected work
Top Rated on Upwork100% Job Success4+ years
★ Top Rated on Upwork
Deployed to production
policies/tenant_isolation.sql
-- every tenant sees only their own rowscreate policy "tenant_isolation" on leads for all using (org_id = (auth.jwt() ->> 'org_id')::uuid);
✓ RLS enabled · 157 API routes audited
Next.js/Supabase/TypeScript/OpenAI/Claude/Stripe/Paystack/Tailwind/Next.js/Supabase/TypeScript/OpenAI/Claude/Stripe/Paystack/Tailwind/
years building AI-powered SaaS
projects delivered end to end
Upwork Job Success Score
regions served: Africa, US, MENA
01 / Services

What I can build for you

SaaS MVPs, fast

Auth, multi-tenant data, billing and a dashboard people actually want to use. A production-ready first version, not a demo.

Explore service : SaaS MVP development

AI features that work

OpenAI and Claude integrations, RAG over your own content with pgvector, content generation and recommendation tools wired into your product.

Explore service : AI developer

Payments and billing

Stripe and Paystack subscriptions, webhooks and plan gating, including billing migrations on live products.

Explore service : Payments integration

Security audits

Row Level Security reviews, API route audits and remediation, so your customers' data stays theirs.

Explore service : Supabase developer

Polished front ends

Figma to code with React, Tailwind and shadcn/ui. Fast, accessible and consistent from the landing page to the dashboard.

Explore service : Next.js developer

Technical co-founder

Architecture decisions, roadmap, hiring input and hands-on building for founders who need a senior technical partner.

Explore service : Full stack developer
02 / Selected work

Products I've built and shipped

CRM · LMS · MARKETING AUTOMATION

LeadsMind

An all-in-one platform for African businesses: CRM, courses, funnels, WhatsApp broadcasts and social publishing in one product. Delivered in milestones for a client who left a 5-star review.

Next.jsSupabasePaystackpgvector
AI revenue forecast
157 API routes audited and hardened, with RLS fixes across the platform
AI suite: forecasting, ad and landing copy, course Q&A with RAG
Real OAuth publishing to LinkedIn, TikTok, YouTube, Facebook and Instagram
Billing migrated from Stripe to Paystack
EDTECH · JOB PORTAL

World Teachers Academy

A teacher certification and placement site for a South African business, with a teaching job portal that captures leads before sending candidates to apply.

Next.jsSupabaseVercelResend
Maths TeacherApply
Primary TeacherApply
ESL TeacherApply
Science TeacherApply
Maths TeacherApply
Primary TeacherApply
ESL TeacherApply
Science TeacherApply
Nightly job ingestion from Adzuna and Reed into Supabase
Lead capture built into the apply flow
Database-backed blog replacing hardcoded template content
OWN PRODUCT · AI VOICE

Velocity

An AI assistant that recovers missed calls and books appointments for local businesses. Co-founded and built in public.

ReactTwilioResend
Missed call detected
AI replies in seconds
Appointment booked ✓
Dashboard design, auth and Twilio integrations
Live at velocity-ai.site
03 / Process

Clear steps, no surprises

STEP 1

Discovery call

We talk goals, users and constraints. You leave with a clear scope and honest timeline.

STEP 2

Plan and architecture

Data model, security rules and milestones agreed before a line of code is written.

STEP 3

Build in milestones

Working software at every milestone, with written progress reports so you always know where things stand.

STEP 4

Launch and support

Deployment, handover and ongoing improvements after you go live.

04 / Stack

Tools I ship with every day

Next.jsReactTypeScriptNode.jsSupabasePostgreSQLRow Level SecurityEdge FunctionsNext.jsReactTypeScriptNode.jsSupabasePostgreSQLRow Level SecurityEdge Functions
OpenAI APIClaude APIStripePaystackTailwind CSSshadcn/uiTwilioVercelOpenAI APIClaude APIStripePaystackTailwind CSSshadcn/uiTwilioVercel
05 / Kind words

What clients say

"
★★★★★

It was a real pleasure working with Zain. Not only is he knowledgeable, but he is also proactive in suggesting ideas based on his expertise. He is professional, committed, and has a really fast turnaround. I will definitely work with him again!

Upwork client
Review on Upwork
"
★★★★★

Great guy to work with and I really can vouch for Zain 100%.

Upwork client
Review on Upwork
"
★★★★★

Amazing work, reliable, cooperative, will work together again.

Upwork client
Review on Upwork
★ Top Rated
100% Job Success
Zain Ul Hassan, Senior Full Stack Developer
06 / About

Hi, I'm Zain.

Senior Full Stack Developer · AI SaaS

I'm a senior full stack developer based in Bahawalpur, Pakistan, working with founders and teams across Africa, the US and the MENA region.

I started on Upwork as a Rising Talent and became Top Rated by keeping a 100% Job Success Score, which comes down to one habit: say what I will deliver, then deliver it.

Alongside client work I build my own products and share the process on LinkedIn and YouTube. I'm also finishing a BS in Software Engineering.

Bahawalpur, PakistanAfrica · US · MENA4+ years
Let's build/Let's ship/Let's scale/Let's build/Let's ship/Let's scale/

Have a product to build? Let's talk.

Tell me what you're building. I reply within one working day with next steps and an honest estimate.

Email me: zainulhassan5857@gmail.comHire me on Upwork