Lakshay Sangwan
Product Engineer at Digiicampus. ~5 years building multi-tenant infrastructure on Java, Spring Boot, AWS, and the modern web. Based in Hisar, India.
Selected work
A few things I've built end-to-end.
A federated SSO hub for cross-tenant account linking
Designed a centralized hub that lets users link accounts across independent tenants using union-find transitive closure and HMAC-signed JWT flows.
2025 architecture
FF1 format-preserving encryption for ID obfuscation
Replaced sequential integer IDs across a multi-tenant platform with FF1-encrypted equivalents to prevent enumeration attacks — without breaking schemas or queries.
2025 security
Cutting $3,400/year from ElastiCache with a cluster-wide audit
Audited 15+ Redis clusters, upgraded from 6.2.6 to 7.1.0 to avoid Extended Support fees, right-sized instances based on actual usage, and fixed cache anti-patterns in application code.
Q1 2025 infra
Side projects
Things I build when I'm not at work.