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Senior Full-Stack Engineer building and scaling enterprise SaaS and high-traffic web applications using React, Node.js, AWS, and modern API design. Leads teams end-to-end from architecture to delivery, with a strong focus on performance, reliability, and measurable business impact. Recently delivered AI-driven solutions including LLM-powered chatbots and RAG systems using OpenAI and LangChain, integrating secure authentication and third-party APIs. Proven at mentoring developers and shipping high-quality products on time with clear, quantifiable outcomes.…Senior Full-Stack Engineer building and scaling enterprise SaaS and high-traffic web applications using React, Node.js, AWS, and modern API design. Leads teams end-to-end from architecture to delivery, with a strong focus on performance, reliability, and measurable business impact. Recently delivered AI-driven solutions including LLM-powered chatbots and RAG systems using OpenAI and LangChain, integrating secure authentication and third-party APIs. Proven at mentoring developers and shipping high-quality products on time with clear, quantifiable outcomes.

umar younis

Full Stack Developer, Back-End Developer, Web Developer, +2

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Senior Full-Stack Engineer building and scaling enterprise SaaS and high-traffic web applications using React, Node.js, AWS, and modern API design. Leads teams end-to-end from architecture to delivery, with a strong focus on performance, reliability, and measurable business impact. Recently delivered AI-driven solutions including LLM-powered chatbots and RAG systems using OpenAI and LangChain, integrating secure authentication and third-party APIs. Proven at mentoring developers and shipping high-quality products on time with clear, quantifiable outcomes.…Senior Full-Stack Engineer building and scaling enterprise SaaS and high-traffic web applications using React, Node.js, AWS, and modern API design. Leads teams end-to-end from architecture to delivery, with a strong focus on performance, reliability, and measurable business impact. Recently delivered AI-driven solutions including LLM-powered chatbots and RAG systems using OpenAI and LangChain, integrating secure authentication and third-party APIs. Proven at mentoring developers and shipping high-quality products on time with clear, quantifiable outcomes.

Available to hire

Senior Full-Stack Engineer building and scaling enterprise SaaS and high-traffic web applications using React, Node.js, AWS, and modern API design. Leads teams end-to-end from architecture to delivery, with a strong focus on performance, reliability, and measurable business impact.

Recently delivered AI-driven solutions including LLM-powered chatbots and RAG systems using OpenAI and LangChain, integrating secure authentication and third-party APIs. Proven at mentoring developers and shipping high-quality products on time with clear, quantifiable outcomes.

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Work Experience

Senior Full Stack Engineer at Cloud Venture

January 1, 2024 - Present

Developed and scaled full-stack applications using React.js, Next.js, Node.js, and Express.js with microservices architecture and RESTful API design. Built serverless backend services on AWS Lambda, API Gateway, and S3, improving scalability and reducing operational overhead by ~30%. Led frontend architecture using Tailwind CSS and modern React patterns, improving UI consistency and cutting development time by ~25%. Integrated OpenAI API and LangChain to build LLM-powered chatbots and automate customer interactions, reducing manual support workload by ~40%. Built a RAG system using Pinecone and OpenAI embeddings to query large document bases with ~95% integration success. Integrated e-commerce platforms and third-party REST/GraphQL APIs, implemented OAuth 2.0 authentication, and supported secure transactions across multiple high-availability enterprise systems.

Full Stack Engineer at Excercys Inc.

July 1, 2021 - January 1, 2024

Led frontend development using React.js, Next.js, HTML5, CSS3, and JavaScript across 10 client projects. Mentored four junior developers through code reviews and pair-programming sessions. Built and maintained scalable backend systems using Node.js, Express.js, AWS, GCP, MySQL, and Firestore, implementing RESTful APIs and microservices for high-traffic applications. Integrated blockchain and third-party services to support secure payments and NFT-based transactions, handling tens of thousands of transactions with zero security incidents. Optimized frontend-backend integrations using code splitting, lazy loading, and caching, improving system performance by ~40% and reducing API response times. Coordinated with cross-functional teams of 5 and maintained a ~95% delivery rate.

Front-End Engineer at Orsys LLC

September 1, 2020 - July 1, 2021

Developed responsive frontend applications using HTML5, CSS3, JavaScript, React.js, and Next.js serving ~50,000 active users across client platforms. Managed backend services using Node.js, Express.js, AWS, GCP, MySQL, and Firestore, maintaining ~99.9% uptime across production environments. Achieved 95% test coverage using Jest and Playwright, improving reliability and reducing production bugs by ~60%. Contributed across the full SDLC in Agile/Scrum, delivering work on time and within quality standards, and introduced modern tooling and engineering best practices, reducing code review cycles by ~30% and improving team development velocity.

Front End Engineer (Intern · Part-Time) at Stack Intel .IOC

August 1, 2019 - September 1, 2020

Contributed to frontend development using React.js and Bootstrap, supporting delivery of five years of college coursework. Implemented new UI features increasing user engagement by ~20% on the main product platform. Assisted with backend API development using Node.js and Express.js, reducing reported errors by ~30% through targeted debugging and optimization. Supported debugging and performance improvements across the application.