HELLO, MY NAME IS

Rajeev Kumar Ranjan

Data Scientist

rajeev@rajeevkr.com​
About Me

Backend Engineer with 14+ years of experience and a Data Scientist with a strong focus on AI, LLMs, and automation. Proven track record in building scalable systems and data-driven solutions that improve performance and efficiency.

I create AI-powered and backend-driven solutions that solve real-world problems.

Experienced Backend Developer with 14+ years of expertise in designing, developing, and maintaining scalable server-side applications. Proficient in Python and Node.js, with a strong background in API development, database management, and cloud computing. Adept at optimizing performance, ensuring security, and driving efficiency through automation.
 
Additionally, a Data Scientist with 5 years of experience, with a focus on data analysis, machine learning, and statistical modeling, leveraging data-driven insights to improve business outcomes. My strong exposure to LLMs and AI focuses on AI-driven automation, NLP applications, and model fine-tuning.
 
I’m passionate about using data to uncover insights, optimize strategy, and solve complex business challenges. I thrive in collaborative environments where clear communication and continuous learning fuel innovation.

What I Do

AI Tools

I build AI tools that automate data workflows, improve decision-making, and integrate with real-world systems using LLMs, machine learning, and APIs. My solutions address challenges in security, compliance, and business intelligence with a focus on performance, accuracy, and real-world impact.

Prediction model

I developed a prediction model that analyzes centralized asset and security data to generate compliance risk reports. By identifying patterns and anomalies, the model supports faster decision-making, reduces issue resolution time, and enhances operational efficiency.

Backend Development

I build scalable and secure backend applications using Python and Node.js, with a focus on clean architecture, robust APIs, and efficient data handling. My work enables reliable automation and seamless integration with databases and cloud platforms to support high-performance, production-ready solutions.

Skills

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Python
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Pandas
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Spark
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LLMs
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AI
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TensorFlow
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RAG
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LangChain
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HugggingFace

Experience

2021-Present

IBM India

Data Scientist

I developed a centralized data pipeline integrating asset and security data from five sources, improving team productivity by 40%. I built Spark-based ETL workflows, stored data in Hive partitions, and implemented Apache Iceberg for versioned analytics. My models generated compliance reports, reducing issue resolution time by 25%. I also deployed RESTful APIs for reporting access, optimized performance by 90%.

2018-2021

Cognizant Technologies

Technical Lead

At Cognizant, I led the development of product enhancements and custom solutions for a global cosmetics client in the retail domain. I built scalable backend applications using Node.js, Python, AWS, and MySQL, and developed RESTful APIs for IoT integration. I created predictive and rule-based models to generate business reports, reducing decision-making time by 30%. I also managed senior development and QA teams, followed Agile practices, and provided technical consultation for requirement scoping and client collaboration.

Click here to know more about me.

Portfolio

Coming Soon…