https://sunilkhobragade.pages.dev SK Builds builds fast, high-concurrency web platforms, autonomous AI agents, RAG systems, and cloud architectures by Sunil Khobragade, Senior Full-Stack Developer & AI Solutions Architect. en-us Tue, 13 Oct 2026 07:22:00 GMT https://sunilkhobragade.pages.dev/blog/building-resilient-ai-agents-with-tool-calling-and-structured-outputs https://sunilkhobragade.pages.dev/blog/building-resilient-ai-agents-with-tool-calling-and-structured-outputs Designing fail-safe LLM tool orchestration, Pydantic/Zod schema validation, self-correcting error loops, and deterministic execution. Tue, 15 Sep 2026 00:00:00 GMT AI LLM Agent TypeScript Python x.kksunil@gmail.com (Sunil Khobragade) https://sunilkhobragade.pages.dev/blog/distributed-rate-limiting-algorithms-token-bucket-redis https://sunilkhobragade.pages.dev/blog/distributed-rate-limiting-algorithms-token-bucket-redis Implementing atomic, sub-millisecond API rate limiting with Redis Lua scripts, sliding window counters, and tier-based throttling. Mon, 10 Aug 2026 00:00:00 GMT Distributed Systems Redis Microservices API Security x.kksunil@gmail.com (Sunil Khobragade) https://sunilkhobragade.pages.dev/blog/postgresql-table-partitioning-and-cdc-streaming-debezium https://sunilkhobragade.pages.dev/blog/postgresql-table-partitioning-and-cdc-streaming-debezium Managing terabyte-scale time-series tables with declarative range partitioning, zero-downtime partition pruning, and Kafka CDC pipelines. Sun, 05 Jul 2026 00:00:00 GMT PostgreSQL Database Kafka CDC Microservices x.kksunil@gmail.com (Sunil Khobragade) https://sunilkhobragade.pages.dev/blog/kubernetes-canary-deployments-with-istio-and-prometheus https://sunilkhobragade.pages.dev/blog/kubernetes-canary-deployments-with-istio-and-prometheus Automating zero-downtime traffic splitting, progressive canary rollouts, and automated error-rate rollback triggers in Kubernetes. Thu, 18 Jun 2026 00:00:00 GMT DevOps Kubernetes Docker Istio Cloud x.kksunil@gmail.com (Sunil Khobragade) https://sunilkhobragade.pages.dev/blog/passkeys-and-webauthn-implementation-clean-architecture https://sunilkhobragade.pages.dev/blog/passkeys-and-webauthn-implementation-clean-architecture Architecting biometric, phishing-resistant authentication using FIDO2 WebAuthn ceremony flows, hardware keys, and Node.js. Thu, 28 May 2026 00:00:00 GMT Security WebAuthn Node.js Authentication Web x.kksunil@gmail.com (Sunil Khobragade) https://sunilkhobragade.pages.dev/blog/zero-js-baseline-web-applications-astro-5 https://sunilkhobragade.pages.dev/blog/zero-js-baseline-web-applications-astro-5 How Islands Architecture, Content Layer loaders, and native web standards yield perfect 100/100 Core Web Vitals and sub-300ms paint times. Mon, 20 Apr 2026 00:00:00 GMT Astro Web Performance TypeScript Frontend x.kksunil@gmail.com (Sunil Khobragade) https://sunilkhobragade.pages.dev/blog/ultra-fast-llm-inference-groq-lpu-streaming https://sunilkhobragade.pages.dev/blog/ultra-fast-llm-inference-groq-lpu-streaming Eliminating generative AI UX delays with Language Processing Units, Server-Sent Events, token chunking, and deterministic SRAM memory architecture. Thu, 15 Jan 2026 00:00:00 GMT AI Groq LLM Streaming TypeScript x.kksunil@gmail.com (Sunil Khobragade) https://sunilkhobragade.pages.dev/blog/low-latency-edge-computing-cloudflare-astro https://sunilkhobragade.pages.dev/blog/low-latency-edge-computing-cloudflare-astro Deploying globally distributed web applications with sub-25ms TTFB, V8 Isolates, Cloudflare Workers KV, and Astro hybrid rendering. Wed, 10 Sep 2025 00:00:00 GMT Edge Astro Cloudflare Performance x.kksunil@gmail.com (Sunil Khobragade) https://sunilkhobragade.pages.dev/blog/autonomous-multi-agent-orchestration-langgraph https://sunilkhobragade.pages.dev/blog/autonomous-multi-agent-orchestration-langgraph Designing stateful cyclic execution graphs, human-in-the-loop interrupt validation, checkpoint persistence, and fault-tolerant agent coordination. Sun, 18 May 2025 00:00:00 GMT AI LangGraph Multi-Agent Python x.kksunil@gmail.com (Sunil Khobragade) https://sunilkhobragade.pages.dev/blog/production-rag-pipelines-pgvector-postgresql https://sunilkhobragade.pages.dev/blog/production-rag-pipelines-pgvector-postgresql Building high-performance semantic retrieval pipelines, HNSW vector indexing, BM25 hybrid search, and cross-encoder reranking inside PostgreSQL. Wed, 22 Jan 2025 00:00:00 GMT AI pgvector PostgreSQL RAG x.kksunil@gmail.com (Sunil Khobragade) https://sunilkhobragade.pages.dev/blog/multi-tenant-database-isolation-architectures https://sunilkhobragade.pages.dev/blog/multi-tenant-database-isolation-architectures Architecting secure, compliant, and cost-effective multi-tenant SaaS data models in PostgreSQL with RLS, connection pooling, and tenant context isolation. Tue, 15 Oct 2024 00:00:00 GMT PostgreSQL SaaS Security Architecture x.kksunil@gmail.com (Sunil Khobragade) https://sunilkhobragade.pages.dev/blog/architecting-concurrency-safe-booking-systems https://sunilkhobragade.pages.dev/blog/architecting-concurrency-safe-booking-systems Preventing double-booking race conditions in high-throughput reservation engines using Redlock, PostgreSQL isolation, and optimistic locking. Thu, 20 Jun 2024 00:00:00 GMT PostgreSQL Redis Concurrency Distributed Systems x.kksunil@gmail.com (Sunil Khobragade) https://sunilkhobragade.pages.dev/blog/scaling-websocket-infrastructure-high-concurrency https://sunilkhobragade.pages.dev/blog/scaling-websocket-infrastructure-high-concurrency Kernel network tuning, Redis Pub/Sub clustering, uWebSockets.js memory optimization, and zombie socket heartbeat reap policies. Wed, 14 Feb 2024 00:00:00 GMT WebSockets Node.js Redis Real-Time x.kksunil@gmail.com (Sunil Khobragade) https://sunilkhobragade.pages.dev/blog/outbox-pattern-distributed-transaction-guarantees https://sunilkhobragade.pages.dev/blog/outbox-pattern-distributed-transaction-guarantees Eliminating dual-write data inconsistencies between SQL databases and message brokers using PostgreSQL ACID transactions and Debezium CDC. Wed, 25 Oct 2023 00:00:00 GMT Architecture PostgreSQL Kafka Distributed Systems x.kksunil@gmail.com (Sunil Khobragade) https://sunilkhobragade.pages.dev/blog/zero-downtime-deployments-with-docker-and-github-actions https://sunilkhobragade.pages.dev/blog/zero-downtime-deployments-with-docker-and-github-actions Blue-green container deployment workflows, automated health probes, zero-loss Nginx traffic switching, and rollback pipelines in CI/CD. Mon, 12 Jun 2023 00:00:00 GMT Docker CI/CD DevOps GitHub Actions x.kksunil@gmail.com (Sunil Khobragade) https://sunilkhobragade.pages.dev/blog/building-high-throughput-microservices-with-nodejs-and-redis https://sunilkhobragade.pages.dev/blog/building-high-throughput-microservices-with-nodejs-and-redis Architecting sub-millisecond API services using Node.js clustering, pipelined Redis operations, cache stampede prevention, and connection pooling. Sat, 18 Feb 2023 00:00:00 GMT Node.js Redis Microservices Performance x.kksunil@gmail.com (Sunil Khobragade) https://sunilkhobragade.pages.dev/blog/integrating-multi-gateway-payments-clean-architecture https://sunilkhobragade.pages.dev/blog/integrating-multi-gateway-payments-clean-architecture A pattern-driven approach to unifying Stripe, Razorpay, and PhonePe with Ports and Adapters, dynamic gateway routing, and webhook idempotency. Thu, 10 Nov 2022 00:00:00 GMT Architecture TypeScript Payments Design Patterns x.kksunil@gmail.com (Sunil Khobragade) https://sunilkhobragade.pages.dev/blog/optimizing-postgresql-queries-high-volume-systems https://sunilkhobragade.pages.dev/blog/optimizing-postgresql-queries-high-volume-systems Techniques for eliminating sequential scans, mastering partial and covering indexes, tuning work_mem, and debugging EXPLAIN (ANALYZE, BUFFERS) traces. Wed, 20 Jul 2022 00:00:00 GMT PostgreSQL Database Performance SQL x.kksunil@gmail.com (Sunil Khobragade) https://sunilkhobragade.pages.dev/blog/designing-event-driven-microservices-rabbitmq-nodejs https://sunilkhobragade.pages.dev/blog/designing-event-driven-microservices-rabbitmq-nodejs Architecting resilient asynchronous messaging topologies, dead-letter exchanges (DLX), consumer backpressure, and publisher confirms in AMQP. Tue, 15 Mar 2022 00:00:00 GMT Node.js RabbitMQ Microservices Event-Driven x.kksunil@gmail.com (Sunil Khobragade)