Harbhajan S.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Jul 16, 2026.

Harbhajan Singh is a highly skilled Data Scientist and ML Engineer with over 6 years of experience in Artificial Intelligence (AI), Machine Learning (ML), and Natural Language Processing (NLP), I specialize in building end-to-end AI solutions that go beyond standard API calls. As an AI expert, I have successfully developed custom AI-driven solutions for financial services, e-commerce, and enterprise applications. My expertise includes LLMs, chatbots, AI automation, recommendation systems, computer vision, and cloud-based AI deployments. I am also the founder of PragatiSphere IT Solutions, focused on delivering cutting-edge AI, analytics, and data-driven solutions. 𝗔𝗜, 𝗡𝗟𝗣 & 𝗟𝗮𝗿𝗴𝗲 𝗟𝗮𝗻𝗴𝘂𝗮𝗴𝗲 𝗠𝗼𝗱𝗲𝗹𝘀 (𝗟𝗟𝗠𝘀) 𝗘𝘅𝗽𝗲𝗿𝘁 - - Extensive experience in Natural Language Processing (NLP), Machine Learning (ML), and AI, specializing in Large Language Models (LLMs) like GPT-4, Claude 3.5, Llama, Falcon, Mistral, and Qwen. - Expertise in fine-tuning open-source LLMs on custom datasets for domain-specific applications such as Q&A systems, persona writing, legal, and enterprise AI solutions. - Proficient in LLM synthetic dataset generation, evaluation frameworks, and efficient model deployment on AWS, GCP, and Azure. - Hands-on experience in building AI-powered chatbots with LangChain, OpenAI, Chromadb, LlamaIndex, CrewAI, Pinecone, FAISS, Qdrant, and vector databases. 𝗔𝗱𝘃𝗮𝗻𝗰𝗲𝗱 𝗔𝗜 & 𝗠𝗟 𝗖𝗮𝗽𝗮𝗯𝗶𝗹𝗶𝘁𝗶𝗲𝘀 - - 𝗖𝗼𝗻𝘃𝗲𝗿𝘀𝗮𝘁𝗶𝗼𝗻𝗮𝗹 𝗔𝗜 & 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻: Custom AI agents & voice bots using CrewAI, LangGraph, OpenAI Swarm. - 𝗖𝘂𝘀𝘁𝗼𝗺 𝗔𝗜 & 𝗡𝗟𝗣 𝗣𝗶𝗽𝗲𝗹𝗶𝗻𝗲𝘀: Implementing text classification, summarization, sentiment analysis, topic modeling, and data clustering. - 𝗔𝗜 𝗔𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻: Low-code/no-code AI workflows using PromptFlow, and LangFlow. - 𝗖𝗼𝗺𝗽𝘂𝘁𝗲𝗿 𝗩𝗶𝘀𝗶𝗼𝗻: Expertise in object detection, motion tracking, scene recognition, and anomaly detection. - 𝗖𝘂𝘀𝘁𝗼𝗺 𝗜𝗺𝗮𝗴𝗲 𝗚𝗲𝗻𝗲𝗿𝗮𝘁𝗶𝗼𝗻: Leveraging Stable Diffusion and Diffusion Models for AI-driven visual content creation. 𝗧𝗼𝗼𝗹𝘀 & 𝗙𝗿𝗮𝗺𝗲𝘄𝗼𝗿𝗸𝘀 - - 𝗟𝗟𝗠 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 & 𝗔𝗜 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗶𝗻𝗴: LangChain, LangServe, LangSmith, Llamandex, HuggingFace, Transformers. - 𝗩𝗲𝗰𝘁𝗼𝗿 𝗗𝗮𝘁𝗮𝗯𝗮𝘀𝗲𝘀: ChromaDB, FAISS, Pinecone, Qdrant, OpenSearch, Azure CosmosDB, Milvus. - 𝗠𝗟/𝗗𝗟 𝗙𝗿𝗮𝗺𝗲𝘄𝗼𝗿𝗸𝘀: TensorFlow, Keras, Scikit-Learn, Dask, Polars, Pandas, Numpy, Plotly - 𝗔𝗣𝗜𝘀 & 𝗕𝗮𝗰𝗸𝗲𝗻𝗱: FastAPI, Flask, Django, Pydantic. - 𝗙𝗿𝗼𝗻𝘁𝗲𝗻𝗱 𝗧𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝗶𝗲𝘀: React, Next.js, HTML, CSS, Bootstrap. 𝗗𝗮𝘁𝗮 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗶𝗻𝗴, 𝗗𝗮𝘁𝗮𝗯𝗮𝘀𝗲𝘀, 𝗗𝗮𝘁𝗮 𝗩𝗶𝘀𝘂𝗮𝗹𝗶𝘇𝗮𝘁𝗶𝗼𝗻 - - 𝗦𝗤𝗟: MySQL, PostgreSQL, SQLite, Azure SQL. - 𝗡𝗼𝗦𝗤𝗟: MongoDB, DynamoDB, Firebase, Redis. - 𝗕𝗜 𝗧𝗼𝗼𝗹𝘀: Tableau, Power BI, Google Data Studio, Excel - 𝗣𝗿𝗼𝗴𝗿𝗮𝗺𝗺𝗶𝗻𝗴 𝗟𝗮𝗻𝗴𝘂𝗮𝗴𝗲: Python, C, R, Latex, React, HTML, CSS As an Data Science & AI expert, I am passionate about leveraging cutting-edge technologies to drive business impact through data-driven decision-making and AI-powered automation. My extensive experience in Data Science, ML, LLMs, and AI infrastructure allows me to solve complex problems and develop scalable AI solutions tailored to diverse industry needs. If you're looking for a specialist in AI, ML, LLMs, automation, or cloud-based deployments, feel free to connect with me—I’d be happy to explore new opportunities and collaborations.