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Full-Stack Engineer @ Callture

Rafay Khan — Full-Stack Product Engineer. I turn ideas into apps, platforms & AI agents people actually use.

I'm Rafay Khan — a full-stack product engineer who takes products from a napkin sketch to the App Store. Architecture, backend, mobile, AI and the boring bits after launch.

See what I've built Let's talk Résumé
9:41

More work

Friday, October 16

9:41

Rafay Khannow

Hey 👋 Welcome to my portfolio. Unlock to explore what I've built.

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It actually works — tap an app.

Trusted to ship for

CalltureWord of MouthDirect Transport SolutionsInvolvzFerrati SportsAchievement Behavior ServicesElite PropertySimply TreesIttefaq SaltNodusTickets

01 — About me

The story so far

Rafay Khan, Full-Stack Product Engineer
Rafay KhanFull-Stack Engineer @ Callture · Lahore, Pakistan

Istartedasafreelancer—fixingbugsandshippingMVPsforclientsonFiverrandUpwork.50+projectslater,alogisticscompanyinAustraliatrustedmeastheironlyengineertobuildtheirentireplatform:adminportal,customerportal,andadriverappwithliveGPS.SincethenI'veputasocialappontheAppStore,builtAIagentsthatqualifyleadsandbookappointments,anddesignedERPsystemsthatrunfactories.TodayI'maFull-StackEngineeratCallture,buildingGupshupTorontoacrossweb,iOSandAndroid.

years shipping production software
4+
freelance projects delivered
50+
countries — Australia, US, Pakistan
3
platforms from one engineer — web, iOS, Android
3

02 — Services

What I can build for you

What I'm hired for most. Hover a card to see a real project — open it for details, examples and FAQs.

Full-stack web platforms

Production SaaS, portals and admin systems built end-to-end — database, API, real-time features and frontend.

Next.jsReactTypeScriptNode.jsPostgreSQLSupabase
Full-stack web platforms — details & examples

iOS & Android mobile apps

Cross-platform apps built with React Native and Expo — one TypeScript codebase shipped to both the App Store and Google Play.

React NativeExpoTypeScriptExpo EASPush Notifications
iOS & Android mobile apps — details & examples

AI agents & voice

Chat and voice agents that know your business, qualify leads and book appointments — wired into your real data.

OpenAIClaudeLangChainpgvectorVapiRetell
AI agents & voice — details & examples

CRM & business automation

Manual workflows turned into pipelines, so your team spends its time closing deals instead of copy-pasting.

n8nZapierMakeHubSpotGoHighLevelOdoo
CRM & business automation — details & examples

DevOps & infrastructure

Deploy pipelines, containers and cloud setup that keep releases boring and uptime high.

DockerAWSGCPTerraformGitHub ActionsVercel
DevOps & infrastructure — details & examples

03 — Selected work

01 / 06AI & Automation

Achievement Behavior (ABS)

24/7 AI Intake Assistant

Captured 64 qualified leads at an 80% completion rate with Ellie, a 24/7 bilingual AI intake assistant syncing parent profiles to Monday CRM.

Read the case study
abcachieve.com
Achievement Behavior (ABS) — live site
02 / 06WebAI & Automation

Ferrati Sports

B2B E-Commerce & AI Order Automation

Delivered an SEO-optimized Next.js B2B e-commerce platform with smart catalog filtering and AI-automated order inquiries for global manufacturing.

Read the case study
ferratisports.com
Ferrati Sports — live site
03 / 06MobileWeb

Direct Transport Solutions

90% Automated Logistics Platform

Replaced a 90% manual logistics workflow with one platform: admin portal, customer portal and a React Native driver app with live GPS tracking.

Read the case study
directtransport.com.au
Direct Transport Solutions — live site
04 / 06MobileWeb

Word of Mouth

Cross-Platform Social Food Discovery App

Launched a cross-platform iOS and Android food discovery app with React Native, Next.js, and Supabase featuring a personalized feed and admin portal.

Read the case study
Word of Mouth — app
05 / 06AI & Automation

B2B Lead Automation

Autonomous n8n Outreach & Reply Engine

Automated 1,200+ personalized B2B emails monthly using n8n, Apollo lead scraping, and a Postgres-backed AI agent that manages replies hands-free.

Read the case study
B2B Lead Automation — cover
06 / 06WebAI & Automation

Elite Property

24/7 AI Real Estate Assistant & Custom CMS

Reduced staffing costs and automated 24/7 lead qualification with a real estate platform, custom CMS, and Gemini AI chatbot with vector search.

Read the case study
elitepropertypk.com
Elite Property — live site

More projects

04 — Client Proof

Shipped results, not promises

Real systems running in production for companies in Australia, the United States, and Pakistan — built directly with founders.
90% manual dispatch automatedAustralia

Direct Transport Solutions

Sole Full-Stack Engineer

Built the entire logistics platform solo: Admin Dispatch Portal, Customer Portal, and React Native Driver app with live WebSocket GPS tracking and Supabase RLS.

Read the case studyRelated service →
Live on iOS App Store & Play StoreUnited States

Word of Mouth

Lead Mobile Engineer

Owned the full mobile lifecycle from scratch using React Native, Expo, and TypeScript — proximity discovery, personalized feeds, push notifications, and EAS store releases.

Read the case studyRelated service →
24/7 automated patient intakeUnited States

Achievement Behavior Services

AI & Automation Engineer

Replaced a high-drop-off multi-step clinical form with Ellie, an empathetic RAG intake assistant that answers parent questions and syncs qualified families straight into the CRM.

Read the case studyRelated service →
<2ms offline cryptographic scanClient: Gallo

NodusTickets

Lead Systems Engineer

Designed an offline-first SaaS ticket validation platform using Ed25519 digital signatures and SHA-256 hash chaining on a Fastify backend to eliminate ticket fraud without internet.

Read the architecture breakdownRelated service →

50+ freelance & contract deliveries across 3 continents

Verify work history, client reviews, and open-source repositories on my public profiles.

Upwork Profile Fiverr Profile LinkedIn

05 — Journey

Where I've done the work

Every role below shipped to real users. Most of them with me as the main engineer.

  1. Oct 2026 — Present

    Callture

    Full-Stack Engineer · Full-time

    • Building Gupshup Toronto end-to-end — a cross-platform product shipping as a web app and native iOS and Android apps.

    Current project

    Gupshup Toronto

    WebiOSAndroidLaunching soon

  2. Dec 2025 — Present

    Involvz

    Software Engineer & Automation Developer · Lahore, Pakistan · Part-time

    • Deliver software for international clients across healthcare, manufacturing, and e-commerce — owning projects end-to-end from architecture through deployment.
    • Owned Shopify development for Simply Trees — custom storefront features, compliance filtering logic, and backend integrations that replaced manual processes.
    • Built AI-powered intake and FAQ chatbots for healthcare clients (ABC Achieve, Jim The Handyman) that qualify leads automatically and sync them to company CRMs.
    • Designed and implemented a full ERP/CRM system in Odoo for Ittefaq Salt, covering manufacturing, inventory, purchasing, sales, and accounting.

  3. Mar 2025 — Present

    Word of Mouth

    Mobile Application Developer · Remote · USA

    • Own the full mobile engineering lifecycle for a production social platform on iOS and Android.
    • Built and shipped the app from scratch with React Native, Expo, and TypeScript — one codebase for both platforms.
    • Developed personalized content feeds and proximity-based discovery.
    • Independently manage push notifications, API integrations, releases, and App Store / Play Store deployments.

  4. Aug 2025 — Feb 2026

    Ferrati Sports

    Software Engineer · Contract · Remote

    • Built internal automation systems to improve outbound B2B sales workflows.
    • Developed data aggregation and lead-enrichment pipelines that replaced manual prospecting.
    • Integrated LLM APIs to generate personalized outreach at scale.

  5. Aug 2023 — Jul 2025

    Direct Transport Solutions

    Full-Stack Engineer · Remote · Australia

    • Sole engineer responsible for designing, building, and maintaining the company's core logistics platform.
    • Built the complete platform: internal Admin Portal, Customer Portal, and a React Native Driver app.
    • Implemented real-time GPS tracking over WebSockets so dispatchers and customers can follow drivers live.
    • Designed the database and access-control model with PostgreSQL and Supabase Row-Level Security.

  6. Client project

    NodusTickets

    Lead Engineer · Client: Gallo

    • Designed an offline-first SaaS ticket validation platform that prevents fraud even without internet connectivity.
    • Built cryptographically signed QR validation (Ed25519) on a Fastify backend — tickets can't be forged or reused.
    • Implemented hash chaining to protect locally stored validation records against tampering.

06 — Beyond code

Off the keyboard

The stuff that doesn't go on a résumé, but shapes how I work.
Boxed at UMT

Boxing

The ring taught me what production teaches: stay calm when you get hit, keep your guard up, and outlast the problem.

Always reading

Philosophy

I read philosophy to think more clearly. It's why I ask "why are we building this?" before "how".

“The impediment to action advances action. What stands in the way becomes the way.”
— Marcus Aurelius

07 — Toolkit

The stack I reach for

BS Computer Science · University of the PeopleDevOps Professional · PagerDuty CertifiedAI Automation Engineer · Tech7 Automation
TypeScriptJavaScriptPythonSQLReactNext.jsReact NativeExpoTailwind CSSShopify LiquidNode.jsFastifyExpressRESTGraphQLWebSocketsPostgreSQLSupabaseMongoDBSQLiteFirebase
pgvectorOpenAIClaudeGeminiLangChainRAGn8nVapiRetellDockerAWSGCPTerraformGitHub ActionsExpo EASVercelHubSpotGoHighLevelSalesforceOdooZoho
Languages
TypeScript, JavaScript, Python, SQL
Frontend & mobile
React, Next.js, React Native, Expo, Tailwind CSS, Shopify Liquid
Backend
Node.js, Fastify, Express, REST, GraphQL, WebSockets
Data
PostgreSQL, Supabase, MongoDB, SQLite, Firebase, pgvector
AI & automation
OpenAI, Claude, Gemini, LangChain, RAG, n8n, Vapi, Retell
Cloud & DevOps
Docker, AWS, GCP, Terraform, GitHub Actions, Expo EAS, Vercel
CRM & ERP
HubSpot, GoHighLevel, Salesforce, Odoo, Zoho

08 — FAQ

Questions people ask me

Straight answers to what clients usually want to know before we start.

Who is Rafay Khan?

Rafay Khan (also known as Rafay Yousafzai) is a full-stack product engineer based in Lahore, Pakistan. He builds web platforms, iOS and Android apps, and AI automations, and is currently a Full-Stack Engineer at Callture. He has 4+ years of experience and 50+ delivered projects for clients in Australia, the United States and Pakistan.

What does Rafay Khan build?

Full-stack web applications (Next.js, React, Node.js), cross-platform mobile apps for iOS and Android (React Native, Expo), AI agents, chatbots and voice agents, CRM and business automations (n8n, HubSpot, GoHighLevel, Odoo), and the cloud infrastructure to run them.

Can Rafay build both the website and the mobile app?

Yes. Most of his projects ship as one system: a web app or admin portal, iOS and Android apps from a single React Native codebase, and a shared backend. For Direct Transport Solutions he built the admin portal, customer portal and driver app as the sole engineer.

Is Rafay Khan available for freelance or contract work?

Yes — he takes on select contract and freelance projects alongside his role at Callture. The fastest way to start is a WhatsApp message or email with a short description of what you want to build.

Does Rafay work with clients outside Pakistan?

Yes. He works remotely with clients worldwide and has shipped production software for companies in Australia, the United States and Pakistan. He is on UTC+5 and usually replies within a few hours.

What tech stack does Rafay Khan use?

TypeScript, Next.js, React, React Native and Expo on the front end; Node.js, Fastify, Express and Python on the back end; PostgreSQL, Supabase, MongoDB and Firebase for data; OpenAI, Claude, LangChain and n8n for AI and automation; and Docker, AWS, GCP and Vercel for infrastructure.

Can Rafay take over or fix an existing codebase?

Yes. A large part of his freelance work has been taking over existing projects — fixing complex bugs, improving performance and SEO, and finishing MVPs that stalled.

How do I hire Rafay Khan?

Message him on WhatsApp (+92 328 9462807), email rafaykhan.mesh@gmail.com, or reach him through Upwork, Fiverr or LinkedIn. Share what you're building and he'll reply with questions and next steps.

09 — What's next

Got an idea?
Let's ship it.

Tell me what you're building. No sales team, no hand-offs — just the engineer who'll build it.

Rafay KhanRafay KhanYou'll talk to me directly
—in Lahore · UTC+5
Replies in a few hoursUsually around now
Start a conversation
rafaykhan.mesh@gmail.com