Avanish Kumar Singh

I’m a backend-focused software engineer with hands-on experience building and scaling production systems. I’ve worked on real-world products at companies like Google (via xWF) and security startups, where I’ve owned backend architectures, optimized legacy systems, and improved application performance by up to 100%.

My work spans Large Scale API design and development utilising parallelisation using frameworks like Celery or from scratch as well as Large Scale ETL pipelines. I enjoy building clean, efficient backends, designing scalable data pipelines, and solving performance and reliability problems at scale.

Backend Developer November 2024 – Present

Google via xWF(Smollan) Navi Mumbai, Maharashtra (Remote)

• Developed REST APIs using FastAPI for Google Retail Project dealing with Firestore and Google Cloud SQL databases.
• Optimised and cleaned legacy codebases.
• Optimised a full stack web application achieving 100% performance increment.
• Optimised data ingress from Firebase Realtime Database to BigQuery.
• Handled the entire backend team of the content management system project involving FastAPI and Google Cloud SQL and Firestore databases.
• Detected and fixed SQL injection vulnerabilities in a FastAPI backend.

Technical Consultant March 2025 – April 2025

WORKWITH AI PTE. LTD. Singapore (Remote)

• Designed and developed data pipelines for image recognition models and improved their efficiency by 50%
• Developed API’s for business logic operations using Flask and SQL
• Maintained and deployed all services on On-Premises production servers in factories.
• Designed a secure and scalable architecture for the factory server deployments.
• Worked with OpenCV to display RTSP streams in React based web pages.

Currently pursuing B.Tech in Computer Science with a specialisation in Cyber Security and Forensics.