Usama Ch

Full Stack Developer

Fiverr • Freelance

Mar 2022 - Present • 4 yrs 8 mos

Working with startups and businesses to build scalable SaaS platforms, AI-driven applications, and high-performance web systems. Key work includes: • Building AI-powered systems using OpenAI, LangChain, LangGraph, and RAG architectures • Developing scalable backend systems and REST APIs using Node.js and TypeScript • Designing SaaS platforms with subscription workflows, automation, and integrations • Implementing vector search and hybrid retrieval for intelligent applications • Creating modern frontend applications using Angular and React Focused on delivering production-ready solutions with clean architecture, performance, and scalability.

Generative AI Engineer

Oro AI LLC • Período integral

Jan 2025 - Sep 2025 • 8 mos

At Oro AI, I worked as a Full-Stack AI Developer contributing to the development of multiple core platform features. My responsibilities included designing and implementing AI-driven job board features, LinkedIn optimization tools, and user onboarding systems. I developed and maintained scalable backend and frontend modules using Angular and Node.js, while integrating AI capabilities using OpenAI, Claude, and LangChain. Key contributions included: • Development of a LinkedIn Profile Optimizer powered by AI to help users improve professional profiles. • Implementation of a Job Board module for managing job listings, candidate workflows, and employer interactions. • Designing and building a secure user signup and onboarding flow for the platform. • Integration of Stripe payment systems for subscription management and token-based AI usage. • Implementation of token purchase tracking and consumption monitoring to manage AI usage across platform features. • Building subscription-based modules with controlled access based on user plans. • Integration of multiple APIs including LinkedIn, OpenAI, Claude, and other third-party services. • Development of AI workflows using LangChain and LangSmith for monitoring and improving AI interactions. Technologies used: Angular, Node.js, Python, OpenAI API, Claude AI, LangChain, LangSmith, Stripe API, LinkedIn API, REST APIs.

Frontend Developer

Virtual College • Meio período

Jan 2018 - May 2018 • 4 mos

Contributed to the development of the DigiSkills Training Project, a national-level initiative launched by the Ministry of IT Pakistan. • Developed frontend features and UI components • Collaborated with the development team on large-scale platform features • Focused on usability and responsive design Gained early experience working on high-impact, real-world systems.