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Syed Salleh Muhammad Shah Gillani

@syedsallehmuhammadsh

Frontend Team Lead at FillinxSolutions building Shopify apps, including an AI chat assistant that lets merchants configure mobile app widgets.

Pakistan

Message

At FillinxSolutions, I lead frontend work across two 5.0-rated Shopify App Store products. For Tapday, I shipped an AI chat assistant that lets merchants create, configure, and update mobile app widgets using natural language.

I led frontend development end to end for Line Loyalty Program & Rewards, integrating it with Shopify Checkout, POS, Customer Accounts, Klaviyo, and Judge.me. I also defined the Next.js and TypeScript architecture used across both products and mentor junior developers through code review, pair programming, and onboarding.

As the sole full-stack engineer on Howler Podcasts, I own the React Native app and backend, and built a clip-sharing feature for turning episodes into 60-second highlights. I also built and maintain samsfsd.com, a live e-commerce platform, and am extending it with a companion React Native app.

Experience

Work history, roles, and key accomplishments

Current

Frontend Team Lead

Current

Fillinx Solutions

Jan 2024 - Present (2 years 9 months)

Leading frontend for two 5.0-rated Shopify App Store products. Lead 3-4 frontend engineers, owning architecture decisions, component patterns, PR review and merge approval.

Next.js TypeScript React React Native Shopify App Bridge Shopify POS Account Management Klaviyo Judge.Me AI Chat Integration Architecture Code Review Mentorship

Current

Full-Stack Developer

Current

Sams FSD

Built and actively maintain samsfsd.com, a live e-commerce platform generating consistent online sales for a retail client. Own every layer — architecture, frontend, backend, hosting and maintenance — as the client's sole technical partner.

Ecommerce Architecture Frontend Backend Hosting Maintenance React Native

Current

Full-Stack Developer

Current

BrandStake Inc.

Sole full-stack engineer on Howler Podcasts, a React Native podcast application published by a US client and live on Google Play. Own the entire stack including React Native app, Node.js backend, database design, release management and ongoing feature development.

React Native NodeJS Backend Development Database Design Release Management Android Auto Podcast Features Clip Sharing

MERN Stack Developer

KountEx

Jun 2022 - Jan 2024 (1 year 7 months)

Converted from a 3-month internship into a full-time role. Shipped features end to end across multiple concurrent client web and mobile projects using React, React Native, Node.js and MongoDB.

React React Native NodeJS MongoDB API Integration State Management Bugfixes

MERN Stack Developer

AlayZone

Dec 2021 - Jun 2022 (6 months)

First professional role — built and maintained features across the stack with React, Node.js, Express and MongoDB on live client web and mobile projects, while building early proficiency in TypeScript and modern frontend tooling.

React NodeJS Express MongoDB TypeScript Frontend Development Tools