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I am a driven full-stack engineer who is dedicated to simplifying the communication between individuals and products by reducing layers of interaction. I enjoy crafting user-friendly, resilient interfaces and scalable back-end systems. I have experience designing and developing accessible user interfaces for scheduling models, learning materials, and streamlined restaurant operations, collaborating across teams to deliver practical solutions.…I am a driven full-stack engineer who is dedicated to simplifying the communication between individuals and products by reducing layers of interaction. I enjoy crafting user-friendly, resilient interfaces and scalable back-end systems. I have experience designing and developing accessible user interfaces for scheduling models, learning materials, and streamlined restaurant operations, collaborating across teams to deliver practical solutions.

Yiqun Xu

Full Stack Developer, App Developer, Back-End Developer, +3

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I am a driven full-stack engineer who is dedicated to simplifying the communication between individuals and products by reducing layers of interaction. I enjoy crafting user-friendly, resilient interfaces and scalable back-end systems. I have experience designing and developing accessible user interfaces for scheduling models, learning materials, and streamlined restaurant operations, collaborating across teams to deliver practical solutions.…I am a driven full-stack engineer who is dedicated to simplifying the communication between individuals and products by reducing layers of interaction. I enjoy crafting user-friendly, resilient interfaces and scalable back-end systems. I have experience designing and developing accessible user interfaces for scheduling models, learning materials, and streamlined restaurant operations, collaborating across teams to deliver practical solutions.

Available to hire

I am a driven full-stack engineer who is dedicated to simplifying the communication between individuals and products by reducing layers of interaction. I enjoy crafting user-friendly, resilient interfaces and scalable back-end systems.

I have experience designing and developing accessible user interfaces for scheduling models, learning materials, and streamlined restaurant operations, collaborating across teams to deliver practical solutions.

Skills

Experience Level

Expert

Expert

Expert

Expert

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Expert

Expert

Expert

Expert

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Expert

Expert

Expert

Expert

Expert

Expert

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Intermediate

Language

English

Fluent

Work Experience

Application Engineer | Social Media Lab at Lehigh University (Social Media Lab)

August 1, 2023 - August 1, 2023

Developed digital tools for older adults to combat online scams, focusing on usability, reliability, and educational impact. Worked remotely across departments to align product goals with user needs, delivering high-quality accessible systems. Contributed to features such as DART Learning Module, scam-awareness simulations, investor engagements, cross-functional collaboration, and performance optimization.

Application Engineer at Social Media Lab, Lehigh University

August 1, 2023 - August 1, 2023

Developed digital tools to help older adults combat online scams. Worked remotely across departments to align product goals with user needs, delivering high-quality accessible software and educational tools.

Application Engineer at Social Media Lab, Lehigh University (Remote)

August 1, 2023 - August 8, 2025

Developed digital tools for older adults to combat online scams with a focus on usability, reliability, and educational impact. Collaborated remotely across departments to align product goals with user needs, delivering high-quality, accessible systems. Designed an interactive DART learning module to educate users on online scams incorporating multi-role authentication, rewards, and tracking for user engagement. Developed phishing simulations and misinformation detection tools to enhance practical training. Played key roles in investor presentations securing funding by effectively demonstrating product impact and growth potential. Conducted quality testing and performance optimization to ensure reliable module functionality across diverse demographics.

Co-Founder & Engineer at 7 Dollar Delivery

December 1, 2022 - October 28, 2025

Led creation of an innovative food delivery platform offering a $7 flat-rate delivery model within 5 miles. Engineered comprehensive technology solutions for the restaurant industry, including mobile apps, QR and NFC-based ordering, POS integrations, and real-time revenue tracking. Collaborated with local San Francisco restaurants, built long-term customer relationships, and tailored software to meet their unique operational needs.

Co-Founder & Engineer at 7 Dollar Delivery

December 1, 2022 - Present

As Co-Founder and engineer, I led the creation of an innovative food delivery platform offering a $7 flat-rate delivery within 5 miles. Engineered comprehensive technology solutions for the restaurant industry including mobile applications, QR and NFC-based ordering, POS integrations, and remote revenue tracking. Enhanced menu management via LLM integration, boosting efficiency by 12,000% using AI-curated images, translations, and pricing. Developed mobile merchant side apps with React Native and Expo, including push notifications and real-time updates with Firebase Cloud Messaging. Built a command queue system for thermal receipt and label printer coordination. Partnered with DoorDash to build a custom delivery API ensuring compliance and seamless logistics integration. Optimized Stripe payment system reducing chargeback and dispute resolution rates by 30%, and introduced offline-enabled frontend using IndexedDB to ensure uninterrupted operations and secure payment processing in unsta