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RAJ GUPTA

@rajgupta12

Senior Software Engineer at Keychain; at Truecaller, I optimized a high-volume API to cut memory use from 6.7GB to 2.3MB.

India

Message

At Truecaller, I worked on microservices for Truecaller for Business handling 1.2M+ requests per second. I also optimized a high-volume data export API, reducing memory usage from 6.7GB to 2.3MB.

At Zocket, I developed Meta and Google SDKs from scratch in Go and contributed to the global product’s backend. My work included a WhatsApp notification system and an optimization rule engine for advertising campaigns.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer - AI Backend

Current

Keychain

Jul 2026 - Present (4 months)

Worked as Senior Software Engineer - AI Backend at Keychain.

Software Engineer

Truecaller

Jun 2025 - Jul 2026 (1 year 1 month)

• Currently working with the Truecaller for Business team on microservices handling 1.2M+ requests per second.
• Collaborated with cross-functional teams to deploy 7 backend services to the EU region, improving latency,
availability, and regional data compliance.
• Built a batch call-pickup prediction service at Truecaller handling up to 1M records/sec using Redpanda, Cassandra, Redis, and Vertex

Founding Engineer

Zocket

Sep 2022 - May 2025 (2 years 8 months)

• As the Founding Member of Global Product, I played a pivotal role in all facets of the project lifecycle, contributing from initial planning to seamless deployment.
• Lead the global product’s backend engine team, ensuring efficient maintenance and performance optimization. Leveraged Go’s concurrency to reduce query response times, achieve scalability, and lower resource consumption. Resulted i

Web Developer Intern

Celebal Technologies

Jun 2022 - Jul 2022 (1 month)

Specifically, I am working on NodeJS websites and developing backends for Websites.
Recently I build the backend for an online book store with functionalities such as searching , creating , deleting and updating.