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Rajan Kashyap

@rajankashyap

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Senior Software Engineer at DigitalPaani who cut database costs by 50% and improved query performance by 60%.

India

Message

At DigitalPaani, I architect and deliver backend microservices for a B2B IoT SaaS platform serving 70+ water treatment plants. I built a real-time analytical engine for live sensor data, helping cut manual analysis effort by 70%.

I also reduced database hosting costs by 50% by migrating MongoDB to a self-hosted AWS cluster, and improved worst-case query performance by 60% through a migration to ClickHouse. Previously, I built compliance monitoring and learning platforms at Sei and FunctionUp.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

DigitalPaani

Sep 2024 - Present (2 years 1 month)

Architected and delivered scalable backend microservices for a B2B IoT SaaS platform serving 70+ water treatment plants, leading Agile/Scrum sprints with 20+ production releases. Reduced database hosting costs by 50% and improved query performance by 60% through migrations.

NodeJS ExpressJS MongoDB Clickhouse EC2 S3 AWS Lambda AWS SQS Cloudwatch Microservices REST APIs Agile Scrum Docker Linux

Software Engineer

Sei

Nov 2023 - Sep 2024 (10 months)

Designed and delivered a NestJS microservices compliance platform with 100% marketing-channel coverage, powering real-time alerts that reduced violation resolution time by 3x. Built Python/FastAPI web scrapers to monitor app stores and review platforms, processing 500+ listings daily.

NestJS Python fastAPI Microservices REST APIs Slack API WhatsApp API Web Scraping Compliance

Software Developer

FunctionUp

Oct 2021 - Nov 2023 (2 years 1 month)

Built and shipped a production-grade LMS backend using Node.js, Express.js, MongoDB, and JWT, supporting 1,000+ active learners. Designed a Redis-backed leaderboard and booking calendar, increasing session bookings by 30%.

NodeJS ExpressJS MongoDB JWT Redis REST APIs Plivo

Backend Development Intern

Fanplay Games

Aug 2021 - Oct 2021 (2 months)

Developed REST APIs, a URL-shortener service, and a shopping cart module using Node.js and Express.js, covering product selection, quantity management, and checkout.

NodeJS ExpressJS REST APIs