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Vishal Kumar

@vishalkumar48

Software Engineer at RagaAI building AI tracing and patient engagement systems, including a fax agent that achieved 35% appointment conversion.

India

Message

At RagaAI, I owned the LLM Tracing Core SDK, removing 28K+ lines of redundant code, and built patient engagement workflows across email, SMS, calling, and Healow. I also developed an AI-powered fax agent that achieved a 35% fax-to-appointment conversion rate and generated over $40K in production revenue.

At Amazon, I designed and owned a rewards service that processed 1M+ daily events, supported 100% of businesses under its point-grant umbrella, and reduced infrastructure costs by 90% versus the legacy system. I also built distributed systems and LLM observability projects using tools including Kafka, ClickHouse, and OpenTelemetry.

Experience

Work history, roles, and key accomplishments

Current

Software Engineer

Current

RagaAI

Jun 2025 - Present (1 year 3 months)

Owned the LLM Tracing Core SDK, eliminating 28K+ lines of redundant code. Built the Multi-Channel Patient Engagement Service and an AI-powered Fax Agent, achieving a 35% fax-to-appointment conversion rate and generating over $40K in production revenue.

Java Python PostgreSQL Temporal Docker Kubernetes OpenTelemetry LLM Tracing RBAC IVR Development Email Workflows SMS

Software Development Engineer

Amazon

May 2024 - Jun 2025 (1 year 1 month)

Designed and owned the PaymentRewardsAuthorityService (PRAS), scaling to support 100% of all businesses under the CBCC point-grant umbrella, processing 1M+ daily reward events and handling 200 RPS during peak Prime Day traffic with 90% infrastructure cost savings. Led a zero-downtime live cutover and the deprecation of the legacy system.

Java AWS Microservices Dagger Unit Testing Integration Testing Service Migration Database Migration

Backend Intern

Fi Money (epifi)

Aug 2023 - Dec 2023 (4 months)

Contributed to the Enach Fund Transfer Flow, building backend workflows that enabled 3M+ Fi users to transfer salary credits from external bank accounts to Fi-partnered bank accounts. Engineered backend components using Golang, Temporal, PostgreSQL, gRPC, and Protocol Buffers, achieving 95%+ test coverage.

Go Temporal PostgreSQL Microservices gRPC Protocol Buffers Unit Testing Integration Testing

Software Development Engineer Intern

Amazon

Jan 2023 - Jun 2023 (5 months)

Led the Cradle to Maestro profile migration, transforming UI-managed profiles into a CI/CD pipeline using Scala and Spark with 100% unit test coverage. Automated P0 metric calculations, freeing on-call SDEs from 4-5 hours of manual weekly calculations.