Abdul Majid - Engineering Notes & Production Systems https://majidkumbhar.site/blogs/index.html Technical articles on AI Engineering, MLOps, Computer Vision, Quantitative Trading, and Resilient Python Architecture. en-us Mon, 14 Sep 2026 10:40:00 +0000 <![CDATA[What Actually Happens After model.fit()? The Real Anatomy of Production ML Systems]]> https://majidkumbhar.site/blogs/what-happens-after-model-fit.html https://majidkumbhar.site/blogs/what-happens-after-model-fit.html Mon, 14 Sep 2026 10:40:00 +0000 <![CDATA[The ML Model Is Only 20% of the System: Engineering the Surrounding 80%]]> https://majidkumbhar.site/blogs/ml-model-is-only-20-percent.html https://majidkumbhar.site/blogs/ml-model-is-only-20-percent.html Mon, 14 Sep 2026 10:40:00 +0000 <![CDATA[Zero-Downtime FastAPI & Docker Deployments for PyTorch Models]]> https://majidkumbhar.site/blogs/fastapi-docker-ml-deployment.html https://majidkumbhar.site/blogs/fastapi-docker-ml-deployment.html Mon, 14 Sep 2026 10:40:00 +0000 <![CDATA[The Anatomy of a Maintainable Python Machine Learning Project]]> https://majidkumbhar.site/blogs/python-production-ml-project-structure.html https://majidkumbhar.site/blogs/python-production-ml-project-structure.html Mon, 14 Sep 2026 10:40:00 +0000 <![CDATA[Detecting Data Drift & Concept Drift in Production ML Systems]]> https://majidkumbhar.site/blogs/monitoring-ml-models-in-production.html https://majidkumbhar.site/blogs/monitoring-ml-models-in-production.html Mon, 14 Sep 2026 10:40:00 +0000 <![CDATA[Explainable Computer Vision: Implementing Grad-CAM Over Deep CNNs for Retinal Lesion Localization]]> https://majidkumbhar.site/blogs/explainable-cv-efficientnet-gradcam.html https://majidkumbhar.site/blogs/explainable-cv-efficientnet-gradcam.html Mon, 14 Sep 2026 10:40:00 +0000 <![CDATA[Building an Automated Image Quality & Artifact Validation Gate for Medical Fundus Scans]]> https://majidkumbhar.site/blogs/image-quality-validation-pipeline.html https://majidkumbhar.site/blogs/image-quality-validation-pipeline.html Mon, 14 Sep 2026 10:40:00 +0000 <![CDATA[Understanding Grad-CAM Math: Saliency Gradients, Feature Maps, and Practical OpenCV Blending]]> https://majidkumbhar.site/blogs/grad-cam-visual-explanation.html https://majidkumbhar.site/blogs/grad-cam-visual-explanation.html Mon, 14 Sep 2026 10:40:00 +0000 <![CDATA[Why Softmax Probabilities Lie: Temperature Scaling & Calibrating Medical AI Models]]> https://majidkumbhar.site/blogs/model-calibration-probabilities.html https://majidkumbhar.site/blogs/model-calibration-probabilities.html Mon, 14 Sep 2026 10:40:00 +0000 <![CDATA[Lessons from Prototyping Clinical Decision Support Tools: Safety Guardrails & Human-in-the-Loop AI]]> https://majidkumbhar.site/blogs/responsible-medical-ai-prototype-lessons.html https://majidkumbhar.site/blogs/responsible-medical-ai-prototype-lessons.html Mon, 14 Sep 2026 10:40:00 +0000 <![CDATA[Engineering 24/7 Python Daemons: Systemd, Dead-Man Switches, and Graceful Restarts]]> https://majidkumbhar.site/blogs/reliable-24-7-python-automation.html https://majidkumbhar.site/blogs/reliable-24-7-python-automation.html Mon, 14 Sep 2026 10:40:00 +0000 <![CDATA[Transforming a Fragile Python Script into a Battle-Tested Background Microservice]]> https://majidkumbhar.site/blogs/python-script-to-production-service.html https://majidkumbhar.site/blogs/python-script-to-production-service.html Mon, 14 Sep 2026 10:40:00 +0000 <![CDATA[Asynchronous Workflows with FastAPI, Celery, and Redis: Handling Heavy Batch Computations]]> https://majidkumbhar.site/blogs/fastapi-celery-redis-background-jobs.html https://majidkumbhar.site/blogs/fastapi-celery-redis-background-jobs.html Mon, 14 Sep 2026 10:40:00 +0000 <![CDATA[Designing Resilient Web Scrapers & ETL Pipelines That Don't Crash on Cloudflare or Schema Changes]]> https://majidkumbhar.site/blogs/designing-resilient-etl-pipelines.html https://majidkumbhar.site/blogs/designing-resilient-etl-pipelines.html Mon, 14 Sep 2026 10:40:00 +0000 <![CDATA[Playwright vs Selenium for Large-Scale Data Extraction: Concurrency, Fingerprinting, and Memory Leaks]]> https://majidkumbhar.site/blogs/playwright-vs-selenium-production-scraping.html https://majidkumbhar.site/blogs/playwright-vs-selenium-production-scraping.html Mon, 14 Sep 2026 10:40:00 +0000 <![CDATA[What I Learned Building a Vectorized Python Backtesting Suite from Scratch]]> https://majidkumbhar.site/blogs/building-python-backtesting-engine-lessons.html https://majidkumbhar.site/blogs/building-python-backtesting-engine-lessons.html Mon, 14 Sep 2026 10:40:00 +0000 <![CDATA[5 Deadly Backtesting Pitfalls That Inflate Simulated Sharpe Ratios & Wipe Out Capital]]> https://majidkumbhar.site/blogs/backtesting-pitfalls-inflated-performance.html https://majidkumbhar.site/blogs/backtesting-pitfalls-inflated-performance.html Mon, 14 Sep 2026 10:40:00 +0000 <![CDATA[Converting Quantitative Rules into 24/5 MetaTrader 5 (MT5) Execution Daemons]]> https://majidkumbhar.site/blogs/rules-to-mt5-bot-automation.html https://majidkumbhar.site/blogs/rules-to-mt5-bot-automation.html Mon, 14 Sep 2026 10:40:00 +0000 <![CDATA[Why Win Rate Is a Trap: Mathematical Expectancy, Payoff Ratios, and Asymmetric Returns]]> https://majidkumbhar.site/blogs/why-win-rate-is-a-trap.html https://majidkumbhar.site/blogs/why-win-rate-is-a-trap.html Mon, 14 Sep 2026 10:40:00 +0000 <![CDATA[Position Sizing & Maximum Drawdown Control: Kelly Criterion vs Fixed Fractional in Live Markets]]> https://majidkumbhar.site/blogs/drawdown-risk-management-automated-trading.html https://majidkumbhar.site/blogs/drawdown-risk-management-automated-trading.html Mon, 14 Sep 2026 10:40:00 +0000 <![CDATA[Architecting a Multi-Service Super-App for Emerging Tier-2 Cities: The Sahulat Experience]]> https://majidkumbhar.site/blogs/architecting-multi-service-superapp-local-city.html https://majidkumbhar.site/blogs/architecting-multi-service-superapp-local-city.html Mon, 14 Sep 2026 10:40:00 +0000 <![CDATA[Geolocation & Dispatch Logic for Local Ride-Hailing Without Multi-Million Dollar Infrastructure]]> https://majidkumbhar.site/blogs/ride-dispatch-architecture-without-uber-scale.html https://majidkumbhar.site/blogs/ride-dispatch-architecture-without-uber-scale.html Mon, 14 Sep 2026 10:40:00 +0000 <![CDATA[Engineering Software for Cash-First Economies: Ledger Reconciliation, OTP Fallbacks, and Low-Bandwidth Networks]]> https://majidkumbhar.site/blogs/engineering-software-cash-first-markets.html https://majidkumbhar.site/blogs/engineering-software-cash-first-markets.html Mon, 14 Sep 2026 10:40:00 +0000 <![CDATA[Managing Multi-Tenant Micro-SaaS Deployments with Docker, Nginx Virtual Hosts, and Automated SSL]]> https://majidkumbhar.site/blogs/multi-tenant-agency-architecture-docker.html https://majidkumbhar.site/blogs/multi-tenant-agency-architecture-docker.html Mon, 14 Sep 2026 10:40:00 +0000 <![CDATA[Digitizing Offline Brick-and-Mortar Operations: Practical Lessons from Restaurant & Retail Portals]]> https://majidkumbhar.site/blogs/from-local-workflow-to-digital-product.html https://majidkumbhar.site/blogs/from-local-workflow-to-digital-product.html Mon, 14 Sep 2026 10:40:00 +0000