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sharjeel K. — Senior Full-Stack Software Engineer from Pakistan

sharjeel K.

Senior Full-Stack Software Engineer

Pakistan 3-6 years
Open to offersNew to Platform
Languages
English
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About

Muhammad S. is a seasoned Full-Stack Software Engineer with over seven years of experience, specializing in AI and blockchain technologies. Based in Karachi, Pakistan, he has made significant contributions as a Freelance Full-Stack Developer on Upwork, where he leads the development of responsive web applications and SaaS platforms using React.js, Next.js, and TypeScript. His work involves creating scalable solutions with Node.js, Express, and Python backends, and securing them with JWT/OAuth. As Co-Founder & CTO at Dechains, Muhammad directed both front-end and back-end development, spearheading the blockchain initiatives and deploying smart contracts. He is proficient in API design with REST and GraphQL, integrating OpenAI technologies for enhanced user interfaces. His commitment to agile methodologies and continuous integration practices is evident through his leadership and mentorship roles, ensuring code quality and compliance across his teams.

Experience

  • Freelance Full-Stack Developer

    UPWORK · 2025 — Present
    Lead development of responsive web applications and SaaS platforms utilizing React.js, Next.js, TypeScript, and Tailwind/MUI. Implemented code-splitting, lazy loading, and server-side rendering for enhanced performance. Developed client-specific SaaS using Node.js/Express and Python/FastAPI with PostgreSQL/MongoDB and Redis for caching, secured via JWT/OAuth. Engineered REST and GraphQL APIs documented with OpenAPI/Swagger and Apollo Server, with OpenAI GPT-4o for NLP and sentiment analysis. Implemented AI automation using Llama 3 for real-time external data handling and delivered results through Agile/Scrum methodologies with GitHub PR reviews and CI/CD on Vercel.

  • Co-Founder & CTO

    DECHAINS · 2021 — 2025
    Defined the technology strategy for the company in alignment with business goals to promote innovation. Oversaw front-end and back-end development of high-performance applications using React.js, Next.js, TypeScript, and Node.js/Nest.js. Managed API-first content workflows with Strapi CMS and directed mobile development for iOS and Android using React Native. Architected data stores in PostgreSQL and NoSQL, and integrated real-time chat and video features using WebSockets and WebRTC. Led blockchain initiatives, including the writing and deployment of smart contracts, while mentoring the engineering team on security practices.

  • Freelance Developer

    UPWORK · 2019 — 2021
    Designed and developed responsive web applications and custom SaaS solutions for various devices. Built and integrated reliable REST APIs, incorporating OpenAI technologies like ChatGPT and Codex. Created hybrid mobile applications using React Native for seamless performance on iOS and Android. Participated in all phases of the software development life cycle, focusing on security and scalability.

Skills & Expertise

Full Stack DeveloperWeb3 DeveloperXeroAI EngineerReact Native DeveloperBackend DeveloperBlockchain DeveloperLanguage ServicesWeb Developer

Education

  • Bachelor of Science in Computer Science
    Umaer Basha Institute of IT · 2018 — 2021
  • FSc Pre-Engineering
    Military College Sui · 2015 — 2017

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