Backend engineering · selected practice
I’m Purushottam Kunwar, a senior backend engineer designing identity, data, and real-time platforms for teams with serious operational stakes.
For hiring teams
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Selected work
Architecture, constraints, and outcomes from production work.
Federated Identity & Access Platform
Design a gateway that speaks both OAuth 2.0 (PKCE) and SAML 2.0 on the IdP side, while presenting a clean OAuth 2.0 interface to all client applications — with zero downtime across auth flows.
Real-Time Logistics Fleet Management
Ingest GPS telemetry from 200+ devices simultaneously over WebSocket, process and store 50K+ location records per day, and render live vehicle positions on a map without melting the database.
Government Pension Information System
Digitize the entire pension lifecycle (enrollment → calculation → disbursement → audit) within strict government security requirements, with data encryption at rest and a complete audit trail.
Maritime Fleet Management Platform
Build a marketplace platform that handles 10TB+ of yacht media (photos/videos/documents), delivers sub-second full-text search across complex yacht specifications, and manages multi-currency transactions.
Showing 4 of 8 documented systems.
Open the complete work indexWorking principles
The habits behind the architecture, from first sketch to quiet operation.
Begin with the boundary, the failure mode, and the person who must operate the system.
A useful case study names the constraint, the decision, and the measurable result.
Architecture is only durable when the next engineer can understand, test, and change it.
For founders & product teams
I help turn ambiguous backend problems into legible architecture, production software, and a path your team can own.
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