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Build a Free, Private “Chat with PDF” App in 70 Lines of Python
A step-by-step guide to building your own private RAG engine in under 70 lines of Python with Ollama and LanceDB. You have a private PDF you need to talk to. But you can’t just upload it to ChatGPT. ...
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Event-Driven Architecture in Node.js: A Guide to High Scale
From “Spaghetti Callbacks” to “Decoupled Microservices”: Implementing the Outbox Pattern, Idempotency, and AI Agents in production. Continue reading on Level Up Coding
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How to Build a High-Performance, Free ELT Pipeline Locally using DuckDB
A Step-by-Step Data Engineering Guide With Python Continue reading on Level Up Coding
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How to Build AI Workflows Without Code Using Activepieces and Sevalla
Let’s learn how to use Activepieces to build smart AI workflows with a simple visual builder. No coding or complex setup needed. Continue reading on Level Up Coding
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How Go’s Context Pattern Prevented a Microservices Meltdown — and Why Most Teams Implement It Wrong
A crash-free breakdown of context propagation across services — cancellations, deadlines, tracing, and the subtle mistakes that nearly… Continue reading on Level Up Coding
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Hugging Face: The Most Powerful AI Platform You Should Start Using Today
How to use models, build apps, explore datasets, and deploy AI — all for free Continue reading on Level Up Coding
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Bayesian Thinking Meets Causality
A practical Python case study inspired by my work in particle physics Continue reading on Level Up Coding
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The Vibe Coding Hangover: Why AI-Generated Code Is Creating a New Generation of Technical Debt
In March 2025, an AI coding assistant called Cursor told a developer something nobody expected: “I cannot generate code for you, as that… Continue reading on Level Up Coding
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The $2.4B Clone: How Three Companies Carved Up One Startup in 72 Hours
Google paid $2.4 billion to license Windsurf’s code and hire its founders. Four months later, they launched Antigravity — which developers… Continue reading on Level Up Coding
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The Silent Machinery Behind Every Program
Linkers and Loaders Continue reading on Level Up Coding
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One Job at a Time: ShedLock-Inspired Concurrency Control in Go
Some time back, I was working on a task that involved running a cron job at a fixed interval. Everything was running perfectly fine. I… Continue reading on Level Up Coding
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Design Spotify Like a Senior Engineer (System Design Interview)
Building a music streaming platform like Spotify is a classic system design problem. It covers audio delivery, metadata management, and… Continue reading on Level Up Coding
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