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Standardized error contracts across 15+ microservice endpoints, eliminating inconsistent error propagation across tenant boundaries.

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Resolved Kafka consumer lag in Mail Sync and Group Sync workflows by optimizing cron scheduling and consumer config, reducing message backlog by 50% under peak load.

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Architected Sales Target Plan search refresh pipeline syncing MongoDB writes to distributed search indexes via event-driven fan-out, enforcing eventual consistency platform-wide.

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Prevented production data regression in legacy tenants by introducing null-safe PlanType normalization, blocking silent data corruption post-deployment.

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Engineered Postman/Newman regression suite across 2 modules covering 30+ scenarios, eliminating 100% of manual API testing and catching critical bugs pre-deployment.

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Designed zero-trust impersonation system (Login As Another User) with JWT claim scoping, RBAC validation, and cryptographic audit logging, deployed across all enterprise tenants.

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Resolved production incidents via Kibana log analysis and OpenLens pod diagnostics, reducing mean time to detection across multi-tenant deployments.

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Integrated SAP Customer Data Cloud (Gigya) for phone OTP login, social login, SMS MFA, and OIDC/OAuth 2.0 authentication — aligning the platform with GDPR and SAP Cloud Security Guidelines.

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Hardened auth security: disabled Gigya voice code by default, enforced configurable password policies (entropy, expiry, history), and resolved phone/email sync edge cases causing login failures.

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Built RESTful deduplication APIs using RFC-compliant email normalization and indexed lookup, eliminating duplicate candidate records across multi-tenant datasets.

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Diagnosed auth edge cases including token expiry races, malformed JWT claims, and invalid sync payloads via defensive validation layers, reducing auth-related production failures.