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Dev.to·Monday, December 15, 2025

Dev.to - Monday, December 15, 2025

10 stories~15 min

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Stories Covered

01

Building Nexa: An AI-First Financial Operating System (Early Build, Real Lessons)

I’ve been quietly building something called Nexa, and I’m finally at the point where I want real outside eyes on it. Not investors. Not marketers. Builders, developers, and people who actually use financial tools. Nexa is an AI-powered financial operating system — not a trading app and not a budgeting spreadsheet. The goal is simple (but hard to execute): Reduce financial chaos by turning fragmented money decisions into a structured, automated system. Think: accounts obligations taxes reminder

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02

Bad Documentation Examples: Why Developers Drop Off | Fixes

Bad documentation can severely hinder developer adoption and engagement. In this article, you will learn about common pitfalls in product documentation and how to address them effectively to enhance usability and trust. Bad documentation is a significant barrier to developer adoption, often leading to frustration and abandonment of products. It encompasses issues such as missing integration guides, outdated CLI references, and poorly structured content. Bad documentation is defined as any conten

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03

Angular Signals, But Better Now for .NET

C# is Great for async Did you know that C# is where async-await and reactive extensions was born? Before rxjs made Observable popular in JavaScript, C# already had IObservable — complete with powerful LINQ operators (without that pipe cerimony, thanks to extension methods). Task and CancellationToken. C# has some of the best async support out there. In fact, it still offers capabilities that JavaScript lacks — async locals, custom awaitables. And yet, one thing has been missing.. Signals. That

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04

The Coffee Bean

About a year ago, I read a book called The Coffee Bean, and it completely changed how I think about challenges. In The Coffee Bean, the author shares a simple experiment. A carrot, an egg, and a coffee bean are all placed in the same boiling water. They all go through the same challenge, but they come out very differently. The carrot becomes soft. The egg becomes hard. But the coffee bean completely transforms the water itself. The lesson is powerful. Challenges affect people in different ways.

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05

Why I Fell in Love With Implementation Work

A few years ago, if you had told me that I would love implementation work, I wouldn't have believed you. Coming from a teaching background, I had experience working with students, but I never envisioned myself teaching adults how to use software or assisting developers with API integration. This role has surprised me in the best possible way. While implementation is technical, at its core, it is profoundly human. People often perceive implementation as merely checklists, administrative tasks, an

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06

Day 9: Met someone ambitious

The Streak Situation Day 9 and I have to admit, the leetcode streak broke. Github streak too. Too many relatives around, schedule completely thrown off, couldn't maintain it. But here's the thing -, I'm not pausing, just restarting. That's an important distinction. A broken streak doesn't mean you failed, it just means you reset the counter and keep going. The work still matters even if the number goes back to zero. People get too attached to streaks sometimes. They become more about maintaini

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07

All Data and AI Weekly #220: 15 Dec 2025

All Data and AI Weekly #220: 15 Dec 2025 ( AI, Data, NiFi, Iceberg, Polaris, Streamlit, Flink, Kafka, Python, Java, SQL, MCP, LLM, RAG, Cortex AI, AISQL, Search, Unstructured Data ) https://bsky.app/profile/paasdev.bsky.social NiFi + AI + AI Data Cloud + Iceberg. https://www.reddit.com/r/DataEngineeringForAI/hot/ Monthly NYC and Youtube Events https://lu.ma/PINSAI https://github.com/tspannhw/TrafficAI/tree/main/Agents https://github.com/tspannhw/conferences ❄️ The Data Cloud & AI

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08

Day 9: When Streaks Break and Ambition Returns

The Streak Situation Day 9 and I have to admit, the leetcode streak broke. Github streak too. Too many relatives around, schedule completely thrown off, couldn't maintain it. But here's the thing -, I'm not pausing, just restarting. That's an important distinction. A broken streak doesn't mean you failed, it just means you reset the counter and keep going. The work still matters even if the number goes back to zero. People get too attached to streaks sometimes. They become more about maintaini

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09

How Sparse-K Cuts Millions of Attention Computations in llama.cpp

I’ve always been drawn to the world of AI, while also enjoying the low-level mindset of embedded systems—understanding how things work under the hood and finding opportunities to optimize them. That combination naturally led me to explore how large models can be made faster and more efficient. During this exploration, I came across an academic paper on Sparse-K Attention, a technique designed to reduce a significant portion of the heavy computation inside the Attention mechanism. After reading i

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10

Cesar Alcantara’s Top 7 Climbs for the New Year

A Mountaineer’s Reflective Guide to Routes That Challenge, Transform, and Inspire Every new year brings with it a quiet invitation — a chance to rise, to challenge the familiar, and to meet the parts of ourselves we haven’t yet discovered. For mountaineer Cesar Alcantara, few things embody this invitation more powerfully than stepping onto a trail that leads upward. Mountains do not simply offer views; they offer perspective. They ask questions. They reshape us in ways that aren’t always immed

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