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<div style="display: none; max-height: 0px; overflow: hidden;">The AI code review market is experiencing rapid growth, so companies are starting to differentiate their products beyond standard performance metrics </div>
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<h1><strong> TLDR Dev <span id="date">2026-01-27</span></strong></h1>
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Bugs sneak out when less than 80% of user flows are tested before shipping. But getting that kind of coverage—and staying there—is hard and pricey for any size team.<p></p><p><a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fwww.qawolf.com%3Futm_source=tldrwebev%26utm_medium=newsletter%26utm_campaign=ACQ_All_Demo_Conversions__NewsletterAudience_-_Newsletter_KissBugsGoodbye_20260127-None_Experiment-FALSE%26utm_term=body-QAWolf%26utm_content=KissBugsGoodbye_GetStartedForFree_None_Headline%253AKissBugsGoodbyeWithFullyAutomatedEndToEndTestCoverage____Newsletter-PrimaryPlacement_20260127_v1_/1/0100019bff59f46b-2a7a92cb-e5da-415f-8aea-150dee429beb-000000/OEpuo3IwiHatGjcC2z8UEhxjzVXeurI17FDhzLRWGKc=441" rel="noopener noreferrer nofollow" target="_blank"><span>QA Wolf's</span></a> AI-native service <strong>supports web and mobile apps</strong>, delivering <a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fwww.qawolf.com%2Fhow-it-works%3Futm_source=tldrwebev%26utm_medium=newsletter%26utm_campaign=ACQ_All_Demo_Conversions__NewsletterAudience_-_Newsletter_KissBugsGoodbye_20260127-None_Experiment-FALSE%26utm_term=body-80PercentAutomatedTestCoverageInWeeks%26utm_content=KissBugsGoodbye_GetStartedForFree_None_Headline%253AKissBugsGoodbyeWithFullyAutomatedEndToEndTestCoverage____Newsletter-PrimaryPlacement_20260127_v1_/1/0100019bff59f46b-2a7a92cb-e5da-415f-8aea-150dee429beb-000000/PvtxXGJN1CQMcD-Ygw278cWapgh9R6ytLP40LZ4CxjQ=441" rel="noopener noreferrer nofollow" target="_blank"><span>80% automated test coverage in weeks</span></a> and helping teams <strong>ship 5x faster</strong> by reducing QA cycles to minutes.</p>
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This dev ported the ~100k line "Pokemon Showdown" codebase from JavaScript to Rust in about a month using Claude Code. The project required overcoming technical and operational challenges, including bypassing Claude's sandbox, automating continuous input, and managing large context windows. It also needed "babysitting" and iterative refinement. The resulting Rust codebase was completed through 5,000 commits.
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<strong>How wrong can a JavaScript Date calculation go? (8 minute read)</strong>
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A JavaScript dev tried adding one month to January 1, 2024, and somehow got March 4, 2023. The culprit was timezone handling, as midnight UTC was still December 31 in Pacific Time, so adding a month landed on the non-existent “February 31”, which overflowed into March.
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This article goes over the geometry of hexagonal grids, including "pointy" and "flat" orientations, and various coordinate systems used in online maps and games. It highlights offset, cube, axial, and doubled systems, recommending axial/cube for their algorithmic elegance and simplicity. The article provides formulas and algorithms for common operations such as finding neighbors, calculating distances, drawing lines, determining movement ranges, rotation, reflection, and generating rings or spirals.
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The AI code review market is experiencing rapid growth, so companies like Greptile are starting to differentiate their products beyond standard performance metrics. Greptile distinguishes itself by its long-term vision for AI code review, built on the pillars of independence, autonomy, and feedback loops. This approach emphasizes separate agents for code generation and validation, pushing for full automation of review, testing, and QA with minimal human intervention.
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<strong>Sometimes Your Job is to Stay the Hell Out of the Way (6 minute read)</strong>
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“Wolves” are rare, highly productive engineers who autonomously tackle critical problems, driven solely by the work's importance rather than recognition. Attempts to formalize "Wolf" roles fail, as these individuals thrive only in a safe, healthy, and distraction-free engineering culture. For managers, the most effective approach is often to recognize genuine "Wolf" contributions and then "stay the hell out of the way."
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<strong>RIP Low-Code 2014-2025 (6 minute read)</strong>
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The rise of AI is an existential threat to low-code platforms as it alters their return on investment. Historically, low-code tools enabled non-technical users to build software with fewer developer resources, but AI coding now makes it faster, cheaper, and easier for developers to ship similar tools in-house.
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Clerk's Client Trust automatically requires a second factor when users sign in from new devices with valid credentials. Attackers can't complete the flow. Legitimate users won't notice. Free & one toggle to enable.<p></p><p><a href="https://tracking.tldrnewsletter.com/CL0/https:%2F%2Fgo.clerk.com%2FWcGV4c0/1/0100019bff59f46b-2a7a92cb-e5da-415f-8aea-150dee429beb-000000/QZ1Qizs4EECdZvvzDebT4gaFTJiroC40nrqck9bSOmM=441" rel="noopener noreferrer nofollow" target="_blank"><span>Turn it on today</span></a>
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VibeFigma is a tool that automatically transforms Figma designs into production-ready React components using Tailwind CSS. It uses the official Figma API for accurate design extraction, generates React/TypeScript components, and has optional AI-powered code optimization.
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<strong>Bonsplit (Website)</strong>
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<span style="font-family: "Helvetica Neue", Helvetica, Arial, Verdana, sans-serif;">
Bonsplit is a macOS library that provides a custom tab bar and layout split system with smooth 120fps animations, drag-and-drop reordering, and SwiftUI support. It allows devs to create, update, and close tabs, and split panes horizontally or vertically, offering full programmatic control over the layout.
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<div style="text-align: center;"><strong><h1>Miscellaneous</h1></strong></div>
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<strong>The Adolescence of Technology (100 minute read)</strong>
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Dario Amodei, CEO of Anthropic, argues that humanity is entering a "technological adolescence" where AI could soon surpass Nobel Prize-level intelligence, creating existential risks ranging from autonomous "rogue" behavior to the democratic collapse of labor markets. The urgent threat of AI-enabled biological weapons and high-tech autocracy can be used to create a permanent global surveillance state.
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<strong>MCP Apps And Interactive UIs In MCP Clients (4 minute read)</strong>
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MCP has evolved into a widely adopted industry standard, but traditionally, its capabilities were confined to text-based interactions. A new official extension, MCP Apps, now extends MCP to support interactive user interfaces by layering HTML on top of the existing protocol. These apps run securely in a sandboxed iframe, have a bidirectional data flow, and are already available for use in clients like Claude and Visual Studio Code.
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<h1><strong>Quick Links</strong></h1>
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<strong>ChatGPT Containers can now run bash, pip/npm install packages, and download files (10 minute read)</strong>
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ChatGPT's code execution container can now run Bash and other languages, install packages via pip and npm, and download files directly from the web.
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<strong>Performance Hints (45 minute read)</strong>
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It is important to cultivate performance intuition from the start.
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<strong>What we learned from leaders building agentic AI at scale (7 minute read)</strong>
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Research with AI engineering leaders shows that the biggest challenges are experiential rather than model-related.
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<strong>After two years of vibecoding, I'm back to writing by hand (6 minute read)</strong>
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AI-generated code for complex projects has no integrity and leads to unmanageable "slop.”
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