Zain Ali Sajid

Zain Ali Sajid

Senior Full Stack Developer at CRIPT Agency

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About
Full Stack Developer with 5 years of experience building production web apps from scratch. I work across the whole stack: React, Next.js, Node.js, TypeScript, and PostgreSQL on most projects, with AI and LLM integrations where the product calls for it.
Experience
Senior Full Stack Developer

CRIPT Agency

May 2025 - Present

Current

- BeBalanced (Medical AI Chatbot): Built a medical AI chatbot using LangChain and a RAG pipeline backed by Postgres. - JessiAI (Dementia Care Assistant): Built a React PWA with an AI voice chatbot. - NexaMortgage (app.bevri.ai): Refactored a broken loan management system into a production-ready platform. - SureHelp Insurance Platform: Took over an incomplete codebase and rebuilt major modules to restore full functionality. - SignWise Inbox: Architected a project-planning platform combining task management with a unified inbox. - Purchase Portal (suncoastprep.purchase-portal.com): Contributing to a school-supply request platform.

Full Stack Developer

WJIKS

January 2024 - April 2025

- OSINT Intelligence Platform: Engineered a high-performance Next.js + TailwindCSS frontend. - VoIP Billing Solution: Created a custom multi-tenant billing system. - Jadops (3D GIS Platform): Delivered real-time geospatial visualization using CesiumJS. - Adaptive Voice Dialer (dialer.wjiks.com): Built a plug-and-play React VoIP dialer.

Full Stack Developer | VoIP Engineer

Graana

March 2022 - December 2023

- Call Center Backend System: Built a centralized contact centre system with zero downtime. - ARMS CRM Dialer: Reduced manual dialling by 60% by building a SIP-based React dialer. - Worksapp CRM (worksapp.com.pk): Upgraded the CRM UI and added real-time call activity.

Full Stack Developer

Freelance / Contract Projects

January 2021 - Present

Current

- Slick Magic AI: Developed an AI-powered SaaS platform using OpenAI. - Siher.eth (siu.si3.space): Developed a site builder module for a Web3 education platform. - Apply Pool (AI University Referral Platform): An AI platform that matches students to universities. - ReferPool (AI Job Referral Platform): An AI chatbot that collects job seekers' skills and experience. - Beard Friends: Launched a niche social platform attracting 5,000+ users. - Twinsting: Fiverr-style freelance marketplace for artists.

Education
Bachelor of Science

ARID University, Rawalpindi

January 2016 - December 2020

Field: Computer Science

Skills
Advanced
JavaScript Next.js Node.js PostgreSQL React.js TypeScript
Intermediate
AWS Docker Python
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