Sadia Umar

Tajir is a YC-backed B2B e-commerce platform transforming retail in Pakistan by enabling retailers and wholesalers to order from a wide catalog via a single Android app. It also powers 12+ operational Android apps and 150+ internal tools via Retool.

• Improved delivery ETA accuracy by implementing sequence-aware ETA logic and a “next-stop” notification system, reducing customer complaints and failed deliveries.
• Reduced last-mile delivery costs by revamping floor stock labeling in custom delivery trucks, improving space utilization and unloading efficiency.
• Built a backend-driven order self-cancellation system with cutoff logic, lowering failed delivery rates and boosting fleet efficiency.
• Designed and deployed a full Field Sales system—Android app and Retool panel—for route planning, shop visits, and performance tracking, boosting customer acquisition.
• Developed a Retool dashboard to track banner and notification performance using BigQuery, GA, and Firebase; added app-level instrumentation for key user events.
• Built an end-to-end purchase order system to streamline vendor invoice processing—from preparation to stock activation—reducing delays and minimizing stockouts.
• Worked across the stack using Python (Flask), PostgreSQL, Kotlin (Android), BigQuery, and Retool to deliver features across logistics, sales, and ops.

• Assisted in teaching core OOP concepts including classes, inheritance, polymorphism, and design principles using C++/Java.
• Conducted weekly lab sessions and office hours to support ~80 second-semester students.
• Helped design and grade programming assignments, quizzes, and exams.

• Managed course delivery for a first-semester batch during instructor absence, handling both lectures and lab sessions.
• Taught foundational programming concepts such as variables, control flow, functions, arrays, and recursion (C++/Python).
• Designed and evaluated assignments, quizzes, and lab exercises, ensuring continuity of learning for ~70 students.