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sanjay achari

@sanjayachari

Full Stack Developer at Ronsare building Next.js and FastAPI applications, with a hotel search response time improved from 9 seconds to 2.

India

Message

At Ronsare, I build full-stack applications and backend services with Next.js, FastAPI, TypeScript, and PostgreSQL. I also develop API integrations and admin dashboards, and manage cloud deployments and CI/CD on Google Cloud Platform.

At Staybook.in, I improved hotel search response time from 9 seconds to 2 seconds and developed city-based ticketing platforms. I’m also building Freshertoday.in, a curated job board for freshers in India, and have delivered four freelance projects from scratch to production.

Experience

Work history, roles, and key accomplishments

Current

Software Developer

Current

Ronsare

Dec 2025 - Present (10 months)

Built scalable full-stack applications using Next.js and TypeScript on frontend and FastAPI on backend, containerized with Docker. Developed admin dashboards, WhatsApp integration via Meta Graph API, and bulk Outlook email campaigns for international clients.

Next.js TypeScript fastAPI Docker GCP CI CD PostgreSQL CSRF Rate limiting

Current

Sr. Full Stack Developer

Current

Ronsare

Nov 2025 - Present (11 months)

Working as a Full Stack Developer, building scalable web applications and backend services using Next.js, TypeScript, FastAPI, PostgreSQL, and Docker. Responsible for designing and developing end-to-end features, optimizing application performance, and maintaining production-ready cloud infrastructure.

Developed and enhanced admin dashboards, integrated third-party APIs including Meta WhatsApp B

Full Stack Developer

Staybook.in

Feb 2025 - Nov 2025 (9 months)

Built features for a hotel booking platform with ~50M monthly impressions using Next.js SSR across frontend with responsive UI. Developed a Firebase chatbot to improve customer support and optimized infinite scrolling from 9s to 2s.

Next.js SSR Responsive UI Firebase Chatbot Performance Optimization

Software Engineer

Staybook.in

Jan 2025 - Oct 2025 (9 months)

Worked as a core Full Stack Engineer for Staybook.in, a travel and hotel booking platform with 40+ million impressions, contributing to high-impact features and performance improvements.

Optimized hotel search and filtering logic, reducing the response time from 9 seconds to 2 seconds using improved FastAPI endpoints, Firebase querying strategies, and efficient SSR rendering in Next.js.

Implemen

Software Engineer Intern

Staybook.in

Apr 2025 - Jul 2025 (3 months)

Worked as Software Engineer Intern at Staybook.in.

Full Stack Developer Intern

ArgonQuber

Aug 2023 - Jan 2025 (1 year 5 months)

Built 25+ microservices using Node.js with JWT and Google authentication, integrated LinkedIn post automation, and developed interfaces using React.js. Deployed and maintained on AWS ensuring backend stability and frontend performance.

NodeJS JWT Google Sign In React AWS Route 53 Load Balancers

SDE intern

Argon-Quber

Aug 2023 - Jul 2024 (11 months)

During my internship at Argon-Quber, I played an integral role in developing microservices, creating and integrating over 20 APIs that enhanced backend scalability and efficiency. I developed two responsive web applications using React.js and Next.js, ensuring a seamless user experience across devices.

I made significant contributions to the Boostopia project (https://boostopia.io/), handling ful