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Prasannakumar B Vardi
Senior Software Engineer specializing in low-latency ad targeting and distributed backend systems
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Backend/platform engineer who built a high-scale audience segmentation and real-time targeting system using Spark/Glue + S3/Hudi and low-latency API services backed by Redis/relational stores. Demonstrates strong production rigor: Spark performance tuning to eliminate OOM failures, API idempotency/caching to cut p95 latency ~40%, and careful dual-run/feature-flag migrations with reconciliation and rollback runbooks. Experienced implementing layered security with JWT/OAuth, RBAC/ABAC, and database row-level security to prevent privilege escalation.
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Key Strengths
- Designed and evolved high-scale audience segmentation/targeting platform with low-latency serving
- Strong data correctness and validation focus; reduced production incidents via validation + observability
- Spark troubleshooting and optimization (skew, broadcast joins, memory/shuffle tuning) eliminating OOM/retry storms
- API reliability improvements using idempotency + Redis caching; reduced p95 latency ~40%
- Risk-managed migrations using feature-flagged dual-run, automated diffs, reconciliation, and staged rollout with rollback plans
- Defense-in-depth security: JWT/OAuth, RBAC/ABAC, database row-level security, audit logging, deny-by-default permissions
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