SDE-I @ Publicis Sapient · AWS Certified · IIT Bhubaneswar (ECE, 2021)
Website: bitsar.net · GitHub: BitanSarkar · LeetCode: @bitanSarkar1997

JavaGoPythonCSQLJavaScript

Spring BootSpring WebFluxWebSphere (WAS)Node.js

AWS (API Gateway, Lambda, DynamoDB, CloudWatch, EventBridge, S3, CloudFront, EC2, Cognito)
KubernetesArgoCDTerraformOpenVPN

DynamoDBOracle DBNeo4j

GitLab CI/CDSonarQubeJaCoCoDockereBPF/libbpfBruno

SAMLOIDCSOAPRESTGraphQLOAuth2 / SSO

Software Development Engineer I — Publicis Sapient(4+ years)

• Core contributor to the Omantel telecom platform and PTT t-ecosys projects
• Built reactive microservices using Spring WebFlux for non-blocking, high-throughput API pipelines
• Integrated SAML/Theqa + Cognito identity flows including OTP-only login, custom authentication providers, EmailVerificationSessionId cookie flow, LTPA generation without WAS, and social login
• Engineered AWS API Gateway configurations and Cognito user pool integrations for auth v2 architecture
• Managed DynamoDB table migrations (52 tables, eu-central-1 → eu-west-1) and resolved Arabic text encoding issues in contains queries
• Wrote CloudWatch Logs Insights queries for ArgoCD sync log analysis and operational monitoring
• Handled Oracle SQL migrations including OCP_DATA_ROAMING schema changes
• Processed YAML/JSON product catalog configs (BaqatiUsagePlan, MOBILE_CONFIG) for telecom product management
• Implemented SOAP envelope wrapping for telecom resource management APIs
• Worked on static asset delivery pipelines via S3 + CloudFront (HTML/CSS cleanup for Omantel privacy policy)

• Kernel-level process monitoring for Kubernetes pods using eBPF/libbpf
• Evolved from the pidwatcher concept; targets open-source kernel contribution

• Go-based API gateway for LLM routing with Redis rate limiting
• Designed for multi-model orchestration and quota enforcement

• Full Terraform automation for EC2 + OpenVPN provisioning
• Includes a VPN cloaking CLI tool for obfuscated tunnel management

• Serverless architecture using AWS Lambda + EventBridge
• Auto-polling with event-driven status notifications

• Built with Python + Selenium, OpenAI for tone analysis
• JSON context memory logging for conversation continuity

• Native Android application for campus navigation (IIT Bhubaneswar)

• Designed URL shortener (widely-read article on LinkedIn)
• Explored GraphQL architecture patterns: stale-while-revalidate + subscription, @defer directive
• Studied Google's internal infrastructure evolution: MapReduce → GFS → Bigtable → Kubernetes
• Actively learning: Dynamic Programming, Graph/Tree algorithms, SQL (beginner → advanced), Blockchain, Neo4j/Cypher

Campus involvement: IIT BBSR Coding Society · Chamber of Product

• FAANG/Top Product Company transition prep (30-day structured DSA + System Design + AI/ML roadmap)
• Six tailored resume versions targeting different FAANG roles
• Building positioning as: "Systems Engineer specialized in infrastructure for AI/ML systems"
• Active on LeetCode for DSA, writing on Medium for technical content

My site — engineering writing, projects, and a kit of developer tools that run entirely in the browser.

• Blog — JVM internals, virtual-thread pinning, Redis Cluster port-forwarding, RAG pipelines from scratch
• Devtools — JWT decoder/signer with JWKS, SAML decoder with X.509 inspection, hash & HMAC, JSON/XML formatters with JSONPath and XPath, UUID/ULID generator, QR generator, HTTP client. Nothing you paste leaves your browser.
• Projects · Resume

• LeetCode (@bitanSarkar1997): Keeping mind sharp
• LinkedIn: URL shortener system design (widely read)
• Quora: Tech Q&A contributions
• Writing an 11-chapter historical documentary on the evolution of physics and mathematics (1850–1950), covering thermodynamics, electromagnetism, relativity, and the foundations of logic

Open to conversations about distributed systems, cloud-native architecture, and AI/ML infrastructure.