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I’m an Software Engineer at Big Oh Notation, Noida, specializing in Generative AI solutions and Retrieval-Augmented Generation (RAG) systems. My focus is on combining strong software engineering practices with applied AI to build scalable and intelligent applications. Current Role Designing and implementing RAG pipelines with vector databases and embeddings. Building and integrating APIs using NestJS and FastAPI for backend operations. Managing database operations and supporting live projects with efficient architectures.…I’m an Software Engineer at Big Oh Notation, Noida, specializing in Generative AI solutions and Retrieval-Augmented Generation (RAG) systems. My focus is on combining strong software engineering practices with applied AI to build scalable and intelligent applications. Current Role Designing and implementing RAG pipelines with vector databases and embeddings. Building and integrating APIs using NestJS and FastAPI for backend operations. Managing database operations and supporting live projects with efficient architectures.

Vineet Rawat

Back-End Developer, Web Developer, AI Developer, +3

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I’m an Software Engineer at Big Oh Notation, Noida, specializing in Generative AI solutions and Retrieval-Augmented Generation (RAG) systems. My focus is on combining strong software engineering practices with applied AI to build scalable and intelligent applications. Current Role Designing and implementing RAG pipelines with vector databases and embeddings. Building and integrating APIs using NestJS and FastAPI for backend operations. Managing database operations and supporting live projects with efficient architectures.…I’m an Software Engineer at Big Oh Notation, Noida, specializing in Generative AI solutions and Retrieval-Augmented Generation (RAG) systems. My focus is on combining strong software engineering practices with applied AI to build scalable and intelligent applications. Current Role Designing and implementing RAG pipelines with vector databases and embeddings. Building and integrating APIs using NestJS and FastAPI for backend operations. Managing database operations and supporting live projects with efficient architectures.

Available to hire

I’m an Software Engineer at Big Oh Notation, Noida, specializing in Generative AI solutions and Retrieval-Augmented Generation (RAG) systems. My focus is on combining strong software engineering practices with applied AI to build scalable and intelligent applications.

Current Role

Designing and implementing RAG pipelines with vector databases and embeddings.
Building and integrating APIs using NestJS and FastAPI for backend operations.
Managing database operations and supporting live projects with efficient architectures.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Work Experience

Software Engineer at Big Oh Notation

November 1, 2025 - Present

Integrated Razorpay payment gateway with subscriptions, usage-based billing, invoice generation, refunds, and idempotent payment flows. Designed and implemented a scalable subscription management system using Cron Jobs, RabbitMQ, and microservice-oriented patterns for reliable billing cycles and credit deduction. Built automated workflows for top-ups, credit usage tracking, webhooks processing, and system monitoring to ensure seamless customer billing experience.

Associate Software Engineer at Big Oh Notation

October 1, 2024 - November 1, 2025

Design and implement full-stack features with Node.js backends and PostgreSQL databases for enterprise applications serving 1,000+ users. Architect RESTful APIs and microservices using NestJS following clean architecture and SOLID principles. Optimize database schemas with proper indexing and normalization, achieving 60% reduction in query execution time. Conduct code reviews for 5+ developers, enforcing secure coding practices and maintaining quality standards. Collaborate with product and design teams in Agile sprints, owning features from planning through production.

Software Engineer Trainee at Big Oh Notation

May 1, 2024 - October 1, 2024

Integrated advanced AI chatbots using prompt engineering and embedding techniques. Designed RAG-based teaching assistant serving 5+ educational institutions, achieving 35% improvement in response quality through vector embeddings and ChromaDB. Managed full-stack development coordinating backend (FastAPI, GPT-4o) and frontend (React) across 4-member team. Implemented real-time sync via Firebase integration, delivering seamless across-device experience with sub-second latency.