https://diljitpr.net/blog.html Distributed systems, AI agents, system design and the occasional trip report, by Diljit. en https://diljitpr.net/blog-post-2026-09-15-openai-realtime-telnyx-sip-cekura-testing.html https://diljitpr.net/blog-post-2026-09-15-openai-realtime-telnyx-sip-cekura-testing.html Tue, 15 Sep 2026 00:00:00 +0530 Put OpenAI's gpt-realtime model on a phone number with Telnyx SIP, verify the webhook, fix one-way audio and clipped greetings, and test it with Cekura. https://diljitpr.net/blog-post-2026-09-10-learning-photography-with-codex-sony-zv-e10-ii.html https://diljitpr.net/blog-post-2026-09-10-learning-photography-with-codex-sony-zv-e10-ii.html Thu, 10 Sep 2026 00:00:00 +0530 Learning photography with Codex on a Sony ZV-E10 II: all 10 practice photos, camera settings, and lessons in focus, aperture, shutter speed and ISO. https://diljitpr.net/blog-post-2026-09-04-best-clipboard-manager-mac.html https://diljitpr.net/blog-post-2026-09-04-best-clipboard-manager-mac.html Fri, 04 Sep 2026 00:00:00 +0530 Four Mac clipboard managers compared on history limits, search, privacy, sync and price: SnipVault, Paste, Maccy and Raycast. Which one to install, and why. https://diljitpr.net/blog-post-2026-08-31-vama-retreats-nandi-hills-pet-friendly-weekend.html https://diljitpr.net/blog-post-2026-08-31-vama-retreats-nandi-hills-pet-friendly-weekend.html Mon, 31 Aug 2026 00:00:00 +0530 An honest trip report: two dogs at VAMA Retreats, a pet-friendly resort near Bangalore at the foot of Nandi Hills. Pet pool, camp night, and what to pack. https://diljitpr.net/blog-post-2026-08-27-qr-code-engagement-offline-retargeting.html https://diljitpr.net/blog-post-2026-08-27-qr-code-engagement-offline-retargeting.html Thu, 27 Aug 2026 00:00:00 +0530 Packaging QR codes out-engage email. Raise scan engagement, capture declared customer intent, and turn offline touchpoints into retargeting audiences at scale. https://diljitpr.net/blog-post-2026-08-25-essential-metrics-voice-ai-agents.html https://diljitpr.net/blog-post-2026-08-25-essential-metrics-voice-ai-agents.html Tue, 25 Aug 2026 00:00:00 +0530 The complete scorecard of voice AI agent metrics and KPIs — latency, comprehension, CX, compliance, and the money math that turns containment into dollars. https://diljitpr.net/blog-post-2026-08-24-losing-12000-dollars-india-dropshipping.html https://diljitpr.net/blog-post-2026-08-24-losing-12000-dollars-india-dropshipping.html Mon, 24 Aug 2026 00:00:00 +0530 I lost $12,000 dropshipping in India. Real numbers on ad costs, 20–40% COD RTO, $350–475 influencer videos, and the fix that got delivery to 92%. https://diljitpr.net/blog-post-2026-08-23-bayesian-sequential-ab-testing.html https://diljitpr.net/blog-post-2026-08-23-bayesian-sequential-ab-testing.html Sun, 23 Aug 2026 00:00:00 +0530 Classical A/B tests assume you look once. A worked example from my personal SaaS — confetti vs pricing cards after first create, with real analytics counts — shows when Bayesian and sequential designs matter, and when you still should not call a winner. https://diljitpr.net/blog-post-2026-08-23-getting-icp-right.html https://diljitpr.net/blog-post-2026-08-23-getting-icp-right.html Sun, 23 Aug 2026 00:00:00 +0530 Most ICPs are fiction dressed as strategy. How to discover your real ideal customer profile from early buyers, beachhead markets, and buying signals — then keep it from going stale. https://diljitpr.net/blog-post-2026-08-06-radical-candor-book-club-engineering-team.html https://diljitpr.net/blog-post-2026-08-06-radical-candor-book-club-engineering-team.html Thu, 06 Aug 2026 00:00:00 +0530 A nine-session plan for running a Radical Candor book club with an engineering team: the format, the discussion questions that actually open people up, the awkward middle weeks, and the traps to avoid. https://diljitpr.net/blog-post-2026-08-03-what-is-an-ai-agent-harness.html https://diljitpr.net/blog-post-2026-08-03-what-is-an-ai-agent-harness.html Mon, 03 Aug 2026 00:00:00 +0530 The model reasons; the harness acts. What an AI agent harness actually is, the eight parts every production harness has, and a working one you can build in 80 lines of Python. https://diljitpr.net/blog-post-2026-08-01-agent-loops-swarms-graphs-laptop-experiment.html https://diljitpr.net/blog-post-2026-08-01-agent-loops-swarms-graphs-laptop-experiment.html Sat, 01 Aug 2026 00:00:00 +0530 Five agent architectures, what each one actually buys you, and a small autoresearch loop you can build and run on your own machine in an afternoon — with the real results from my run. https://diljitpr.net/blog-post-2026-07-26-dummys-guide-to-evals-ai-agents.html https://diljitpr.net/blog-post-2026-07-26-dummys-guide-to-evals-ai-agents.html Sun, 26 Jul 2026 00:00:00 +0530 The zero-jargon introduction to evals for AI agents: what they are, the three grader types, a copy-paste starter suite for a voice agent, and the operating loop that makes it all compound. https://diljitpr.net/blog-post-2026-07-26-evals-testing-observability-voice-ai-agents.html https://diljitpr.net/blog-post-2026-07-26-evals-testing-observability-voice-ai-agents.html Sun, 26 Jul 2026 00:00:00 +0530 A practical guide to evaluating, testing, and observing AI voice agents: WER and its limits, latency budgets, simulation testing with personas, LLM-as-judge calibration, and tracing across the STT, LLM, and TTS pipeline. https://diljitpr.net/blog-post-2026-07-26-what-are-evals-voice-agent-example.html https://diljitpr.net/blog-post-2026-07-26-what-are-evals-voice-agent-example.html Sun, 26 Jul 2026 00:00:00 +0530 What evals actually are and how to build them for a voice AI agent, illustrated with a production home-services agent: scripted judges, deterministic checks, LLM-as-judge scoring, and simulated callers. https://diljitpr.net/blog-post-2026-06-21-best-qr-code-generators.html https://diljitpr.net/blog-post-2026-06-21-best-qr-code-generators.html Sun, 21 Jun 2026 00:00:00 +0530 The best QR code generators for 2026 compared — free static codes, dynamic tracking, pricing, design and exports. See why QRCodeStack tops the list, plus 5 strong alternatives. https://diljitpr.net/blog-post-2026-02-24-inside-dot-claude-filesystem-architecture.html https://diljitpr.net/blog-post-2026-02-24-inside-dot-claude-filesystem-architecture.html Tue, 24 Feb 2026 00:00:00 +0530 A deep dive into the ~/.claude directory structure that powers Claude Code. Understanding how session state, project memory, debug logs, and task management are organized on disk. https://diljitpr.net/blog-post-2026-02-11-anatomy-of-great-prompt-llm-guide.html https://diljitpr.net/blog-post-2026-02-11-anatomy-of-great-prompt-llm-guide.html Wed, 11 Feb 2026 00:00:00 +0530 Understanding how LLMs work internally to write consistently powerful prompts. A technical deep dive into transformer architecture, probability distributions, and prompt engineering from a software engineer's perspective. https://diljitpr.net/blog-post-2024-08-10-sending-automated-appointment-reminders-postgresql-google-sheets-n8n-whatsapp.html https://diljitpr.net/blog-post-2024-08-10-sending-automated-appointment-reminders-postgresql-google-sheets-n8n-whatsapp.html Sun, 01 Feb 2026 00:00:00 +0530 Learn how to build an automated appointment reminder system for a clinic using PostgreSQL, Google Sheets, n8n, and WhatsApp API. Case study showing practical automation that reduces friction without disrupting workflows. https://diljitpr.net/blog-post-postgresql-dlq.html https://diljitpr.net/blog-post-postgresql-dlq.html Thu, 25 Dec 2025 00:00:00 +0530 Learn how to use PostgreSQL as a Dead Letter Queue (DLQ) for event-driven systems. Case study from Wayfair showing how to handle failures in Kafka consumers with PostgreSQL for better observability and retry mechanisms.