EXPLORE


4.9
4.9
95%
$50 USD / Hour
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Pakistan (9:17 PM)
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Joined on December 4, 2024
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2 Recommendations
$50 USD / Hour
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I am an AI-focused Full-Stack Engineer with 10+ years of experience building scalable web and mobile applications, now specializing in Machine Learning and Large Language Models (LLMs). I work at the intersection of software engineering and AI, helping businesses turn data into automated, practical, and user-friendly solutions. My core strength is building production-grade AI systems. I design and deploy LLM-powered applications such as intelligent assistants, chatbots, and decision-support tools. I focus on performance, cost optimization, and reliability to ensure these systems work effectively in real-world environments. I have hands-on experience with OpenAI, Anthropic, and Google Gemini. I build solutions using prompt engineering, embeddings, structured outputs, and semantic search to create accurate, context-aware applications. I also develop Retrieval-Augmented Generation (RAG) pipelines that connect AI models with private data sources like documents, databases, and APIs. Beyond LLMs, I develop Machine Learning and Deep Learning models, including computer vision systems for object detection, tracking, and recognition, as well as NLP solutions and LLM fine-tuning. I also build Generative AI and Agentic AI systems using tools like LangChain and N8N for workflow automation. I design complete AI architectures, including vector databases, agent-based systems, and multi-step reasoning workflows. I implement MLOps practices using Docker, FastAPI, and AWS to ensure scalable and reliable deployments. With a strong MERN stack background, I build robust, scalable web applications using MongoDB, Express.js, React, and Node.js. I develop high-performance APIs, secure backend systems, and modern, responsive frontends optimized for speed and usability. I also specialize in website optimization, improving performance, Core Web Vitals, SEO readiness, and overall user experience. In addition, I provide ongoing website maintenance services, including bug fixing, performance monitoring, updates, security improvements, and uptime optimization to ensure long-term stability and reliability. I also develop cross-platform mobile apps using Flutter and provide data-related services such as web scraping, API integration, and automation, along with virtual assistance and admin support when required. Core skills include AI/ML systems, LLMs, RAG, computer vision, NLP, MLOps, MERN stack development, Flutter, cloud platforms, website optimization, maintenance, and scalable system design. I build AI SaaS platforms, chatbots, copilots, document processing systems, recommendation engines, analytics solutions, and high-performance web applications. My focus is always on delivering clean, scalable, and business-aligned solutions with continuous improvement in accuracy, latency, performance, and cost.
Verifications
On time
100%
On budget
100%
Accept rate
92%
Repeat hire rate
29%

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Q-Learning visualizer

Health Book App

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Kwela (Ride Hailing App)

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Bioinformatics WebApp

Road Taffic Monitoring

Secret Photo Vault- Photo Lock

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Thanks for your work on this project. I appreciate the effort you put in. The overall delivery was good, but there are a few areas where I think we can improve going forward.
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Did a swift bug Fix Check.
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Great experience working with this freelancer. Very professional, responsive, and delivered high-quality work on time.
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It was great working with Sajid. He understood my requirement and was always available to address my needs. Satisfied with his work.
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I have worked with Sajid for last many assignments, he is a competent, reliable and efficient freelancer. With his dedication and expertise he has become my preferred service provider even if there are lower quotes available.
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Experience
Senior MERN Developer
Mar, 2014 - Sep, 2024
•
10 years, 6 months
Async Digital Network
Mar, 2014 - Sep, 2024
•
10 years, 6 months
No Description Provided
Syed B.
@MASBukhari
Project Consultant and Developer
Sajid proved to be exceptional. I selected him solely on the basis of his experience and expertise. I am delighted that he did not prove it wrong rather delivered the project beyond my expectations. It was wonderful experience, provided tasks were done well. The beauty of a talented and experienced person is that it foresee what will be required next and where something will get stuck causing issue, that critical thinking aspect was found within Sajid.
Mar, 2014 - Sep, 2024
•
10 years, 6 months
Education
Lahore University of Management Sciences
1998 - 2002
•
4 years
BSCS

Pakistan
1998 - 2002
•
4 years
intermediate level
1996 - 1998
•
2 years

Pakistan
1996 - 1998
•
2 years
Metric
1993 - 1995
•
2 years

Pakistan
1993 - 1995
•
2 years
Qualifications
Senior MERN Developer
2024
Credly
I have been performing following work during my stay with ASYNC Digital Network: - Web application development (front-end, back-end) - API design and development - Database design and optimization - Cloud deployment and management - Code review and refactoring - Technical documentation
2024
Publications
Comparison of Web Development in MERN Stack and WordPress
2025
Sajid Nazir
MERN stack (MongoDB, Express.js, React, Node.js) offers full control for dynamic, scalable web apps, ideal for complex, real-time projects. WordPress, a CMS, is best for blogs, e-commerce, and small business sites, providing themes and plugins for easy customization without coding. MERN ensures flexibility and performance, while WordPress enables rapid deployment for non-developers. MERN suits advanced projects, whereas WordPress is user-friendly for quick website creation.
2025
MERN Stack Development of late
2024
Sajid293r
Recent advancements in MERN stack development emphasize improving performance, scalability, and the overall developer experience. Notable trends include the use of TypeScript for enhanced type safety, implementing server-side rendering (SSR) with React to boost SEO, utilizing GraphQL for more efficient API data retrieval, and adopting microservices for better scalability. MongoDB Atlas simplifies database management, while containerization and DevOps practices optimize the deployment process.
2024
Certifications
P
Preferred Freelancer Program SLA
Freelancer Orientation