Full-stack engineer

Sudhanshu Shekhar builds reliable product systems.

Senior Engineer at Marsh McLennan, focused on scalable full-stack platforms, AI workflows, and backend systems with Go, React, and FastAPI.

GoPythonTypeScriptReactAWS

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Currently

Senior Engineer - Application Development

Profile

About me

Full-stack engineer focused on scalable systems, product impact, and clear craft.

Senior Engineer

Marsh McLennan

May 2025 – Present

AI systems

RAG & LangChain

30% faster responses

Competitive coder

LeetCode Knight

Top 5.2% · 1867 rating

I am a Senior Engineer - Application Development at Marsh McLennan, building multi-region procurement platforms with React, FastAPI, and Go. I focus on modular microservices, AWS infrastructure, and LLM-driven workflow automation.

Previously at Chat360, I co-owned a GenAI platform with RAG pipelines and LangChain agents, engineered distributed systems processing 100K+ emails/day, and founded a voice automation platform on Golang microservices.

Competitive programmer with LeetCode Knight (top 5.2%, rating 1867, 1000+ problems) and Codeforces Specialist (max rating 1440). Led 7 web development projects with Google DSC at GDSC IIIT Surat.

Languages

GoPythonTypeScriptJavaScriptSQLC/C++

Backend

Node.jsFastAPIDjangoExpressREST APIs

Frontend

ReactNext.jsAngular

Databases & Caching

PostgreSQLMongoDBRedis

Infrastructure & DevOps

AWS (EKS, EC2, S3)DockerNginxCaddyGitHub Actions

Messaging & Streaming

KafkaRabbitMQCelery

AI/ML

OpenAI APIsLangChainPinecone

Concepts

Distributed SystemsMicroservicesSystem DesignDBMSOOP

Career

Experience

Shipping production systems, AI features, and platforms used at real scale.

Marsh McLennan

Senior Engineer – Application Development

May 2025 – Present

Pune, Maharashtra

Drove development of a multi-region procurement platform, improving supplier visibility and compliance across enterprise workflows
Owned design and delivery of Supplier Management system (ReactJS, FastAPI), reducing onboarding time by 40%
Re-architected legacy systems into modular services, cutting API latency by 30–40% and infra costs by 25%
Directed migration from on-prem Kubernetes to AWS (EKS, EC2, S3), achieving 99.9%+ uptime and 50% faster deployments
Built LLM-based decision engine for procurement workflows, increasing compliance accuracy and reducing manual effort by 35%
Partnered with cross-functional teams to optimize APIs and caching, improving throughput under high-concurrency workloads

Chat360

Software Engineer

June 2024 - April 2025

Pune, Maharashtra

Co-owned GenAI platform, building RAG pipelines and agents (LangChain, Pinecone) reducing response latency by 30%
Engineered distributed email system processing 100K+ emails/day with 99.9% reliability
Designed cross-channel campaign workflows (WhatsApp, Email, SMS, Push), improving conversions by 20%
Founded and scaled voice automation platform using Golang microservices with real-time STT/TTS and concurrent call handling
Delivered chat and campaign features increasing engagement by 15% and reducing operational issues by 95%

Selected work