Technical write-ups from production systems: AI agents, MCP, .NET, Azure and automation for legacy systems.https://tanle.ca/enhttps://tanle.ca/blog/ai-meeting-assistant/https://tanle.ca/blog/ai-meeting-assistant/Live transcripts with speakers, answers grounded in company context and on-screen data about two seconds after the question, and why the same engine leads to an AI phone receptionist.Sat, 03 Oct 2026 00:00:00 GMTAI AgentsVoice AILLM.NETCase Studyhttps://tanle.ca/blog/spec-driven-development-spec-kit/https://tanle.ca/blog/spec-driven-development-spec-kit/Shipping two real features to production with Claude Code and GitHub's Spec Kit, and where production proved the spec wrong.Sat, 26 Sep 2026 00:00:00 GMTAI AgentsClaude CodeLessons Learnedhttps://tanle.ca/blog/local-routines-with-ai-agents/https://tanle.ca/blog/local-routines-with-ai-agents/Moving back-office jobs from "a person does this every morning" to "an agent does it, a person checks the summary", and what did and did not work.Wed, 23 Sep 2026 00:00:00 GMTAI AgentsClaude CodeAutomationLessons Learnedhttps://tanle.ca/blog/iprocessor-under-the-hood/https://tanle.ca/blog/iprocessor-under-the-hood/The parsing engine, the stack and the delivery pipeline behind IProcessor: an Azure WebJob that reads 60+ vendor invoice layouts from a shared mailbox.Tue, 22 Sep 2026 00:00:00 GMT.NETAzureIntegrationCase Studyhttps://tanle.ca/blog/iprocessor-gmd-stores/https://tanle.ca/blog/iprocessor-gmd-stores/A tour of IProcessor: vendor invoice PDFs parsed automatically, reconciled against purchase orders, received in the warehouse with RFID pick-and-pack checks and Zebra labels, and reported on for margins.Sun, 20 Sep 2026 00:00:00 GMT.NETAutomationCase Studyhttps://tanle.ca/blog/hiding-detail-sections-on-phones/https://tanle.ca/blog/hiding-detail-sections-on-phones/Hiding two desktop-only tabs on phones in a legacy ASP.NET WebForms app turned into a small routing policy: saved links, window resizes and slow AJAX responses.Sat, 19 Sep 2026 00:00:00 GMTLegacy .NETFrontendCase Studyhttps://tanle.ca/blog/staffpoint-google-calendar-sync/https://tanle.ca/blog/staffpoint-google-calendar-sync/The backend for syncing staff assignments to Google Calendar in Staffpoint, a large ASP.NET WebForms staffing platform on .NET Framework 4.8: the product, its stack, and how the sync works.Wed, 16 Sep 2026 00:00:00 GMTLegacy .NETIntegrationCase Studyhttps://tanle.ca/blog/zero-cost-sql-mcp-server/https://tanle.ca/blog/zero-cost-sql-mcp-server/A read-only SQL MCP server for Claude and ChatGPT with Microsoft's Data API builder: one JSON file, a two-line Dockerfile, an App Service plan we already paid for, and the eight things I wish I had known.Mon, 14 Sep 2026 00:00:00 GMTMCPAI AgentsAzureLessons Learnedhttps://tanle.ca/blog/azure-static-web-apps-to-cloudflare/https://tanle.ca/blog/azure-static-web-apps-to-cloudflare/Moving a React app on Azure Static Web Apps to a Cloudflare-managed custom domain without exposing an unfinished site, and everything else the hostname touched: CORS, email and Stripe redirects.Thu, 10 Sep 2026 00:00:00 GMTAzureCloudflareDevOpshttps://tanle.ca/blog/ticket-listings-monitor-python/https://tanle.ca/blog/ticket-listings-monitor-python/Porting a ticket-listings monitor from legacy .NET to a lean Python service: a proof-of-work bot challenge in pure code, "what is new" decided in SQL Server, and Slack alerts within seconds.Mon, 07 Sep 2026 00:00:00 GMTPythonAutomationIntegrationhttps://tanle.ca/blog/self-shutting-down-azure-vm/https://tanle.ca/blog/self-shutting-down-azure-vm/About 280 million domain names from ~1,000 TLD zone files, processed weekly on a Linux VM that a Logic App boots and that deallocates itself when the .NET 8 job is done, so idle cost stays close to zero.Sun, 06 Sep 2026 00:00:00 GMTAzure.NETCloud CostDevOpshttps://tanle.ca/blog/azure-blob-retention/https://tanle.ca/blog/azure-blob-retention/About 100,000 blobs a day, never deleted. How a "should we just move this to SQL?" question became a lesson about where cloud costs hide, and the retention job that fixed it.Fri, 04 Sep 2026 00:00:00 GMTAzureCloud CostLessons Learnedhttps://tanle.ca/blog/power-automate-desktop-inventory/https://tanle.ca/blog/power-automate-desktop-inventory/Automating a weekly StubHub research routine with Power Automate Desktop: repeatable browser filters, an Excel work list, a state file for the weekly cycle, and the choices that let it run unattended.Wed, 02 Sep 2026 00:00:00 GMTPower AutomateAutomationCase Studyhttps://tanle.ca/blog/market-intelligence-platform/https://tanle.ca/blog/market-intelligence-platform/A year of freelance work for a US ticket broker: Ticketmaster event ingest, seat-availability snapshots as time series, Slack alerts, and data pipelines running across two clouds.Mon, 31 Aug 2026 00:00:00 GMT.NETAzureAWSCase Studyhttps://tanle.ca/blog/lysted-skybox-sync-via-slack/https://tanle.ca/blog/lysted-skybox-sync-via-slack/A sales platform with no webhooks and no usable order API: parsing "tickets sold" HTML emails out of Slack to record sales in SkyBox, plus automatic settlement reconciliation.Fri, 28 Aug 2026 00:00:00 GMTIntegrationAutomation.NEThttps://tanle.ca/blog/parsing-dirty-llm-json-csharp/https://tanle.ca/blog/parsing-dirty-llm-json-csharp/LLMs return almost-JSON: greetings, Markdown code fences, numbers as strings, the odd missing bracket. The defensive layers I use in C# to treat model output like user input, not like an API response.Tue, 25 Aug 2026 00:00:00 GMTLLM.NEThttps://tanle.ca/blog/classifying-ticket-emails-fine-tuning/https://tanle.ca/blog/classifying-ticket-emails-fine-tuning/The AI pipeline that reads and classifies hundreds of event-ticket emails a day: prompt engineering, emails with images, building a dataset and fine-tuning GPT-4o-mini.Sun, 23 Aug 2026 00:00:00 GMTLLMAI Agents.NETCase Studyhttps://tanle.ca/blog/automation-hub-dotnet/https://tanle.ca/blog/automation-hub-dotnet/One .NET console app, dispatched by command-line argument and driven by Task Scheduler, that connects more than 10 systems for a ticket-resale business: POS, marketplaces, banking, Slack and an AI that reads email.Sat, 22 Aug 2026 00:00:00 GMT.NETAutomationIntegrationCase Studyhttps://tanle.ca/blog/domain-research-platform-lessons/https://tanle.ca/blog/domain-research-platform-lessons/Four months and a hundred-plus commits building a domain research SaaS: SQL performance at 13 million rows, stale third-party data, background jobs and multi-tenancy.Sat, 22 Aug 2026 00:00:00 GMTLessons LearnedCase Studyhttps://tanle.ca/blog/webhook-receiver-azure-function/https://tanle.ca/blog/webhook-receiver-azure-function/A C# HTTP-triggered Azure Function that receives SkyBox invoice webhooks in real time, with the subscription request and HMAC signature check.Fri, 18 Mar 2022 00:00:00 GMTAzure.NETIntegrationhttps://tanle.ca/blog/azure-p2s-vpn-azure-sql/https://tanle.ca/blog/azure-p2s-vpn-azure-sql/Working notes on a point-to-site VPN into an Azure virtual network: self-signed certificates in PowerShell, a private endpoint for Azure SQL, and connecting from SSMS.Sat, 19 Feb 2022 00:00:00 GMTAzureDevOpshttps://tanle.ca/blog/gitlab-cicd-azure-app-service/https://tanle.ca/blog/gitlab-cicd-azure-app-service/A GitLab CI/CD pipeline that builds a .NET Framework web app and WebJob on Windows runners and deploys to staging, DR and production App Services with Web Deploy.Sat, 19 Feb 2022 00:00:00 GMTDevOpsAzure.NEThttps://tanle.ca/blog/power-automate-slack-alerts/https://tanle.ca/blog/power-automate-slack-alerts/Posting alerts to Slack with Power Automate when a stored procedure in Azure SQL finds rows that hit the criteria.Tue, 03 Aug 2021 00:00:00 GMTPower AutomateAutomationhttps://tanle.ca/blog/power-automate-mailbox-to-sharepoint/https://tanle.ca/blog/power-automate-mailbox-to-sharepoint/A Power Automate flow that watches a shared mailbox for expense reports, saves attachments to a SharePoint library and marks each email read and complete.Wed, 14 Jul 2021 00:00:00 GMTPower AutomateAutomationhttps://tanle.ca/blog/power-automate-holiday-request/https://tanle.ca/blog/power-automate-holiday-request/A holiday request flow built from Microsoft Forms, Teams, Power Automate and Exchange: the form, the manager lookup, the approval and the condition, with screenshots.Sat, 10 Jul 2021 00:00:00 GMTPower AutomateAutomationhttps://tanle.ca/blog/aws-api-gateway-lambda-cognito/https://tanle.ca/blog/aws-api-gateway-lambda-cognito/Working notes on securing an API Gateway + Lambda endpoint with Amazon Cognito: logging in from the CLI and with plain curl, plus the references that helped.Fri, 11 Jun 2021 00:00:00 GMTAWShttps://tanle.ca/blog/aws-cicd-pipeline/https://tanle.ca/blog/aws-cicd-pipeline/Working notes on applying the AWS DevOps blog's automated CI/CD pipeline for .NET Core Lambda functions to my own project, including a CodeCommit credential issue on Windows.Sat, 05 Jun 2021 00:00:00 GMTAWSDevOpshttps://tanle.ca/blog/aws-api-gateway-s3-proxy/https://tanle.ca/blog/aws-api-gateway-s3-proxy/Step-by-step notes for an API Gateway service proxy that reads and writes S3 objects in nested folders through a single {proxy+} resource.Wed, 26 May 2021 00:00:00 GMTAWShttps://tanle.ca/blog/aws-api-gateway-s3/https://tanle.ca/blog/aws-api-gateway-s3/Notes on exposing an S3 bucket as a REST API with API Gateway: the IAM role, its trust relationship, and folder/item path parameters.Tue, 25 May 2021 00:00:00 GMTAWS