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Rajesh Kumar

@rajeshkumar28

Principal Engineer at FICO who architected Agentic AI decisioning and a runtime delivering 100K RPS at sub-10ms P99 latency.

India

Message

At FICO, I architected Agentic AI capabilities that turn natural-language requirements into decision workflows, with human approval before publication. I also designed a cloud-native decision runtime delivering 100K RPS at sub-10ms P99 latency.

I built asynchronous evaluation capabilities to benchmark workflow correctness, retrieval, latency, and token efficiency. At Calix India Pvt Ltd, I architected a distributed streaming platform processing 5M+ events per hour and designed a low-code workflow engine used by 1,000+ technicians.

Earlier, I co-architected Samsung SmartThings cloud services and led modernization of a legacy e-commerce platform at Hitachi India. I also founded Jobleet, an AI-native hiring platform with automated interviews, multi-agent evaluation, and live coding sandboxes.

Experience

Work history, roles, and key accomplishments

Principal Engineer

Fair Isaac Corporation (FICO)

May 2025 - Jul 2026 (1 year 2 months)

Architected Agentic AI capabilities using LLMs, LangGraph, MCP, RAG, and Vector Search for decision workflows with HITL approval. Designed a cloud-native execution platform achieving 100K RPS at sub-10ms P99 latency and built AI evaluation and benchmarking for accuracy, quality, latency, reliability, and token efficiency.

C#ASP.NET Core Azure Event Hubs Python Temporal HITL React TypeScript Kubernetes gRPC PostgreSQL MongoDB GitOps ArgoCD Tekton Helm OpenTelemetry Prometheus Grafana LangGraph RAG Vector Search

Principal Software Engineer

Procore Technologies

Dec 2024 - Apr 2025 (4 months)

Designed and developed a high-volume telematics ingestion platform using Temporal and Kafka for reliable, scalable real-time fleet data processing. Used AI agents to accelerate enterprise integration design and implemented durable scheduling, retries, failure recovery, idempotency, and E2E distributed tracing.

C#.NET Core WPF Python AI Agents RAG Azure Event Hubs Temporal OpenTelemetry Honeycomb REST APIs Microservices Distributed Systems Telematics and IoT

Staff Software Engineer

Calix India Pvt Ltd

Jun 2022 - Nov 2024 (2 years 5 months)

Architected a distributed streaming platform processing 5M+ events/hour using C#, Kafka, Redis, and Kubernetes. Designed a metadata-driven low-code workflow engine enabling 1,000+ technicians to customize workflows without code redeployments, accelerating feature delivery by 15%.

C#Web APIs Python RAG Vector Search Agent React Kafka Redis Elasticsearch Kubernetes AWS Helm ArgoCD

Manager

Hitachi India

Apr 2021 - May 2022 (1 year 1 month)

Led modernization of a legacy e-commerce platform into a serverless, event-driven microservices architecture on AWS. Architected an adaptive search pipeline using Elasticsearch/OpenSearch supporting approximately 1M searches/day and led high-volume data-processing initiatives using Spark, PySpark, AWS Glue, ETL, and CDC.

NodeJS React TypeScript AWS Lambda API Gateway Serverless DynamoDB Amazon SQS OpenSearch AWS Glue Spark PySpark CDC Microservices

Lead Member Technical Staff

Athenahealth Pvt Ltd

Jan 2020 - Mar 2021 (1 year 2 months)

Provided technical leadership for high-throughput healthcare interoperability solutions based on HL7/FHIR standards. Designed and developed a resilient parallel execution framework supporting 1,000+ TPS and drove analysis and resolution of distributed concurrency and thread-contention bottlenecks.

C#WPF Microservices PostgreSQL

Staff Engineer

Samsung Electronics

Nov 2011 - Jan 2020 (8 years 2 months)

Co-architected high-availability Samsung SmartThings cloud services powering global device connectivity, state synchronization, and remote management at scale. Architected the Samsung Smart Classroom suite and designed health and wellness microservices for Samsung Wearables, focusing on real-time telemetry and user security.