Resume

Curriculum Vitae

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Bitan Sarkar

Software Engineer · AWS Certified Solutions Architect

bitansarkar12345@gmail.com Kolkata, India GitHub LinkedIn LeetCode Guardian

Experience

Software Development Engineer

2021 – Present

Publicis Sapient — Omantel (Telecom, Oman)

  • Led IBM WebSphere → AWS cloud-native microservices migration for a 1M+ subscriber telecom platform.
  • Built SAML/Theqa SSO integrations and AWS Cognito auth flows (v1 & v2) from scratch.
  • Engineered reactive microservices with Spring WebFlux for high-throughput customer-experience APIs.
  • Owned cross-region DynamoDB migrations — 52 tables — under production load with zero downtime.
  • Designed PTT t-ecosys infrastructure as code with Terraform; became go-to engineer for high-risk items.

Selected Projects

  • IRCTC PNR Status Notifier — Serverless PNR status tracker with automatic SMS/email alerts when waitlist clears.
  • Scalable URL Shortener — Production-grade URL shortener design on AWS Lambda + MongoDB with a widely-read LinkedIn article.
  • CloakVPN — Fully automated, GUI-powered VPN system. Terraform provisions OpenVPN EC2s across AWS regions, rotating IPs on demand.