https://lieftech.dev Dev, business, and daily routines — all in one log. en Tue, 28 Jul 2026 13:29:10 GMT https://lieftech.dev/blog/2026-07-12-weekly-retrospective-july-week-2-2026 https://lieftech.dev/blog/2026-07-12-weekly-retrospective-july-week-2-2026 Sun, 12 Jul 2026 00:00:00 GMT As it's gotten easier to build services with AI, I've been watching so many of them come to life and fade away. WeeklyRetrospectiveJulyWeek2026retrospect https://lieftech.dev/blog/2026-07-06-weekly-retrospective-july-week-1-2026 https://lieftech.dev/blog/2026-07-06-weekly-retrospective-july-week-1-2026 Mon, 06 Jul 2026 00:00:00 GMT It's been a while since I wrote my retrospective — I usually write one every week. WeeklyRetrospectiveJulyWeek2026retrospect https://lieftech.dev/blog/2026-07-06-duolingo-luis-von-ahn-founder-story https://lieftech.dev/blog/2026-07-06-duolingo-luis-von-ahn-founder-story Mon, 06 Jul 2026 00:00:00 GMT Luis von Ahn invented CAPTCHA, sold reCAPTCHA to Google, and won a MacArthur 'genius' grant — then walked away from all of it to solve a problem from his childhood in Guatemala: education that only the rich can afford. How a computer scientist who was obsessed with harnessing human attention built Duolingo into a public company with hundreds of millions of learners. DuolingoLuis von AhnFounder StoryEdTechGamification https://lieftech.dev/blog/2026-07-06-3dgs-vs-unreal-3d-construction-methods-use-cases https://lieftech.dev/blog/2026-07-06-3dgs-vs-unreal-3d-construction-methods-use-cases Mon, 06 Jul 2026 00:00:00 GMT 3D Gaussian Splatting captures reality; Unreal Engine authors it. This is a practical comparison of how you actually build a scene with each pipeline, what the result looks and behaves like, and the real productions — from Polycam captures to LED-wall virtual production — where each one ships. 3D Gaussian SplattingUnreal Engine3Dvirtual productionphotogrammetryreal-time renderinggame engine https://lieftech.dev/blog/2026-07-02-unreal-engine-llm-ai-npc-developer-skills-2026 https://lieftech.dev/blog/2026-07-02-unreal-engine-llm-ai-npc-developer-skills-2026 Thu, 02 Jul 2026 00:00:00 GMT In 2026, wiring a large language model into an Unreal Engine NPC stopped being a research demo and became a plugin you install from FAB. NVIDIA's ACE Game Agent SDK, Convai's NeuroSync, on-device small language models — here's what actually changed, and the concrete skills a game developer needs to build a character that talks back. Unreal EngineLLMGame DevelopmentAI NPCNVIDIA ACE https://lieftech.dev/blog/2026-07-02-midjourney-david-holz-founder-story https://lieftech.dev/blog/2026-07-02-midjourney-david-holz-founder-story Thu, 02 Jul 2026 00:00:00 GMT David Holz spent nearly a decade building Leap Motion, raised $94M, and watched it sell for a fraction of its peak. Then he did the opposite: he started Midjourney with no outside capital, ~40 people, and a Discord bot — and turned it into a reported $500M-ARR business. How a burned VC skeptic built one of the most profitable companies in AI. MidjourneyDavid HolzFounder StoryAIBootstrapping https://lieftech.dev/blog/2026-07-02-claude-fable-5-dev-workflow-in-practice https://lieftech.dev/blog/2026-07-02-claude-fable-5-dev-workflow-in-practice Thu, 02 Jul 2026 00:00:00 GMT The Claude Fable 5 release notes tell you the parameters that changed. They don't tell you how it reshapes your day-to-day workflow — the timeouts, the prompts you have to unlearn, and why 'high' effort is usually the right default. A practitioner's field notes after a few weeks of building on Fable 5. ClaudeFable 5AnthropicAI WorkflowLLM https://lieftech.dev/blog/2026-06-29-luma-ai-ray3-uni-1-creative-agents https://lieftech.dev/blog/2026-06-29-luma-ai-ray3-uni-1-creative-agents Mon, 29 Jun 2026 00:00:00 GMT Luma AI started as a 3D-capture app, became a top-tier AI video model with Ray3, and is now wagering its future on Uni-1 — a single 'unified intelligence' model that reasons in language and renders in pixels in one pass. Here's what Luma actually shipped, why the $4B valuation, and where it's heading. LumaRay3AI VideoGenerative AIUni-1 https://lieftech.dev/blog/2026-06-29-figma-dylan-field-founder-story https://lieftech.dev/blog/2026-06-29-figma-dylan-field-founder-story Mon, 29 Jun 2026 00:00:00 GMT Dylan Field dropped out of college on a $100k Thiel grant, then spent four years building nothing anyone could see — burning through ideas like drones and a meme generator before landing on 'Google Docs for design.' How Figma survived a near-failure stealth period, a blocked $20B Adobe acquisition, and IPO'd in 2025 at $68 billion. FigmaDylan FieldFounder StoryStartupsDesign https://lieftech.dev/blog/2026-06-28-weekly-retrospective-june-week-4-2026 https://lieftech.dev/blog/2026-06-28-weekly-retrospective-june-week-4-2026 Sun, 28 Jun 2026 00:00:00 GMT I spent a hectic month—three services, a review, a competition application, and more. WeeklyRetrospectiveJuneWeek2026retrospect https://lieftech.dev/blog/2026-06-28-spotify-daniel-ek-founder-story https://lieftech.dev/blog/2026-06-28-spotify-daniel-ek-founder-story Sun, 28 Jun 2026 00:00:00 GMT When Daniel Ek started Spotify, the music industry was being hollowed out by piracy and everyone agreed the answer was lawsuits. Ek disagreed. He bet that you could not sue people away from free music — you could only out-experience it. The story of how a working-class kid from a Stockholm suburb made streaming start in 200 milliseconds, survived years of brutal licensing fights, and turned 'better than stealing' into a $30-billion company. StartupFounder StorySpotifyDaniel EkMusic Streaming https://lieftech.dev/blog/2026-06-26-best-ai-video-generation-models-2026 https://lieftech.dev/blog/2026-06-26-best-ai-video-generation-models-2026 Fri, 26 Jun 2026 00:00:00 GMT Veo 3.1, Kling 3.0, Runway Gen-4.5, Seedance, and the strange case of Sora's shutdown. A clear-eyed map of the AI video generation models that actually matter in 2026 — how they differ, which one to pick for what, and where the field is heading. AI VideoVeoKlingRunwaySora https://lieftech.dev/blog/2026-06-25-claude-fable-5-mythos-5-update-performance https://lieftech.dev/blog/2026-06-25-claude-fable-5-mythos-5-update-performance Thu, 25 Jun 2026 00:00:00 GMT Anthropic's Claude Fable 5 is now its most capable widely released model, and Claude Mythos 5 brings the same engine to Project Glasswing. Here's what actually changed in the API, why thinking is now always on, and what the performance gains look like in practice. ClaudeAnthropicFable 5Mythos 5LLM https://lieftech.dev/blog/2026-06-24-stripe-collison-brothers-founder-story https://lieftech.dev/blog/2026-06-24-stripe-collison-brothers-founder-story Wed, 24 Jun 2026 00:00:00 GMT Stripe is now one of the most valuable private companies on earth, processing payments for millions of businesses. But it started with two teenage brothers from rural Ireland who had already sold one company before they could legally drink — and who were annoyed that taking money online was absurdly hard. Here's how Patrick and John Collison built it. StartupFounder StoryStripeCollison BrothersPayments https://lieftech.dev/blog/2026-06-24-replit-amjad-masad-founder-story https://lieftech.dev/blog/2026-06-24-replit-amjad-masad-founder-story Wed, 24 Jun 2026 00:00:00 GMT Replit lets anyone write and run code in a browser, and is now valued north of a billion dollars. But it started as an open-source side project by a kid in Amman, Jordan, who refused to believe that programming had to be hard to start. Here's how Amjad Masad turned a browser hack into a company betting on the next billion software creators. StartupFounder StoryReplitAmjad MasadDeveloper Tools https://lieftech.dev/blog/2026-06-22-x-money-6-percent-apy-elon-musk https://lieftech.dev/blog/2026-06-22-x-money-6-percent-apy-elon-musk Mon, 22 Jun 2026 00:00:00 GMT X Money, the fintech app built inside X, is reportedly offering 6% APY on savings plus 3% cash back — roughly 15x the US national average savings rate. Here's how the offer works, where the 6% really comes from, and the catches worth understanding before you move your cash. FintechX MoneyElon MuskPersonal FinanceBanking https://lieftech.dev/blog/2026-06-22-nvidia-jensen-huang-founder-story https://lieftech.dev/blog/2026-06-22-nvidia-jensen-huang-founder-story Mon, 22 Jun 2026 00:00:00 GMT Nvidia is now one of the most valuable companies on earth and the engine room of the entire AI boom. But it began in a Denny's booth in 1993, nearly died after its first chip flopped, and survived only because the founder told a customer the truth and a Japanese games company paid him anyway. Here's how Jensen Huang built it. StartupFounder StoryNvidiaJensen HuangSemiconductors https://lieftech.dev/blog/2026-06-22-claude-fable-5-export-control-shutdown https://lieftech.dev/blog/2026-06-22-claude-fable-5-export-control-shutdown Mon, 22 Jun 2026 00:00:00 GMT On June 9, 2026, Anthropic released Fable 5 and Mythos 5, its most capable models ever. Three days later it suspended access after a US export-control directive limited the models to US nationals. Here's what happened, why national security got involved, and what it means for the AI industry. AIAnthropicClaudeExport ControlsAI Policy https://lieftech.dev/blog/2026-06-21-weekly-retrospective-june-week-3-2026 https://lieftech.dev/blog/2026-06-21-weekly-retrospective-june-week-3-2026 Sun, 21 Jun 2026 00:00:00 GMT It feels like I've just been frantically tackling one thing after another, and somehow it's already the end of June. WeeklyRetrospectiveJuneWeek2026회고retrospect https://lieftech.dev/blog/2026-06-20-when-not-to-use-subagents https://lieftech.dev/blog/2026-06-20-when-not-to-use-subagents Sat, 20 Jun 2026 00:00:00 GMT Sub-agents are the default reflex for any hard task now — but Anthropic's own engineering guidance is blunt about where they backfire. A look at the token math, the decomposition test, and the failure modes that mean a single agent is the right call. AI AgentsSub-AgentsMulti-AgentLLMContext Engineering https://lieftech.dev/blog/2026-06-20-notion-founder-story https://lieftech.dev/blog/2026-06-20-notion-founder-story Sat, 20 Jun 2026 00:00:00 GMT Notion is a $10B+ workspace used by over 100 million people — but in 2015 it was two founders in a cheap Kyoto apartment who had scrapped their code, laid off their only employees, and were borrowing money from mom. Here's how Ivan Zhao and Simon Last almost died, then rebuilt. StartupFounder StoryNotionProductEntrepreneurship https://lieftech.dev/blog/2026-06-20-from-agents-to-harness-to-loop-engineering https://lieftech.dev/blog/2026-06-20-from-agents-to-harness-to-loop-engineering Sat, 20 Jun 2026 00:00:00 GMT The discipline of building with LLMs has shifted three times in two years — from crafting agents, to crafting the harness around them, to crafting the loop the agent runs inside. Here's what each shift actually changed and why it matters. AI AgentsLLMAgent EngineeringDeveloper Workflow https://lieftech.dev/blog/2026-06-20-commercial-real-estate-investing-complete-guide https://lieftech.dev/blog/2026-06-20-commercial-real-estate-investing-complete-guide Sat, 20 Jun 2026 00:00:00 GMT A practical, numbers-first walkthrough of investing in commercial retail property — how yield really works, the location and tenant signals that matter, the due diligence that protects your downside, and the taxes and exit math most first-time buyers get wrong. Real EstateInvestingCommercial PropertyPassive IncomeCash Flow https://lieftech.dev/blog/2026-06-19-app-target-research-method-real-examples https://lieftech.dev/blog/2026-06-19-app-target-research-method-real-examples Fri, 19 Jun 2026 00:00:00 GMT A practical method for identifying and validating your app's real target audience — using App Store reviews, community listening, competitor changelogs, and micro-experiments, with examples from Notion, Calm, and Duolingo. productresearchapp-developmentstrategy https://lieftech.dev/blog/2026-06-18-why-developers-leave-claude-open-source https://lieftech.dev/blog/2026-06-18-why-developers-leave-claude-open-source Thu, 18 Jun 2026 00:00:00 GMT Cost, privacy, refusals, and a narrowing capability gap are pushing developers from Claude's API to self-hosted open-source models. Here's what that shift looks like from the inside. Claudeopen sourceLLMAI infrastructure https://lieftech.dev/blog/2026-06-18-moltbook-app-development-and-exit https://lieftech.dev/blog/2026-06-18-moltbook-app-development-and-exit Thu, 18 Jun 2026 00:00:00 GMT A first-person account of building Moltbook — a developer knowledge-capture tool — from a weekend prototype to a successful acquisition, and what the journey taught me about shipping with intent. StartupProductBuildingAcquisitionIndieHacker https://lieftech.dev/blog/2026-06-18-mcp-skills-hooks-sub-agents-how-to-choose https://lieftech.dev/blog/2026-06-18-mcp-skills-hooks-sub-agents-how-to-choose Thu, 18 Jun 2026 00:00:00 GMT Claude Code offers four extension layers — MCP, skills, hooks, and sub-agents — that look similar but operate at fundamentally different depths. Here's a clear framework for choosing the right one. MCPClaude CodeAI ToolsDeveloper Workflow https://lieftech.dev/blog/2026-06-18-llm-rag-graphrag-back-to-basics https://lieftech.dev/blog/2026-06-18-llm-rag-graphrag-back-to-basics Thu, 18 Jun 2026 00:00:00 GMT A clear-eyed look at what large language models, retrieval-augmented generation, and graph-based RAG actually are — and when each one earns its place. LLMRAGGraphRAGAIFundamentals https://lieftech.dev/blog/2026-06-18-lief-os-what-i-used-own-developing-in-local https://lieftech.dev/blog/2026-06-18-lief-os-what-i-used-own-developing-in-local Thu, 18 Jun 2026 00:00:00 GMT A CLI-replacement tool I built to run and manage multiple solo projects—shared standards, per-project issue tracking, and accumulated Git history/context, all in one place. LiefOSowndevelopinglocalthought https://lieftech.dev/blog/2026-06-17-kubernetes-vs-aws-lambda-cost-per-request https://lieftech.dev/blog/2026-06-17-kubernetes-vs-aws-lambda-cost-per-request Wed, 17 Jun 2026 00:00:00 GMT A clear-eyed look at the real cost math behind Kubernetes and AWS Lambda — and how to know which one is bleeding your budget without you noticing. kubernetesaws-lambdaserverlesscloud-cost https://lieftech.dev/blog/2026-06-17-google-colab-cli-notebooks-meet-terminal https://lieftech.dev/blog/2026-06-17-google-colab-cli-notebooks-meet-terminal Wed, 17 Jun 2026 00:00:00 GMT Google's Colab CLI lets developers manage notebooks and runtimes from the command line, making Colab viable in CI pipelines and automated workflows for the first time. Google Colabmachine learningdeveloper toolsCLI https://lieftech.dev/blog/357 https://lieftech.dev/blog/357 Tue, 16 Jun 2026 00:00:00 GMT Samsung Electronics is fighting to reclaim its position in high-bandwidth memory as AI data centers reshape the semiconductor market. Here's what's actually at stake. SamsungSK HynixHBMAI ChipsKorean StocksSemiconductors https://lieftech.dev/blog/2026-06-16-ray-ban-meta-oakley-meta-ai-glasses https://lieftech.dev/blog/2026-06-16-ray-ban-meta-oakley-meta-ai-glasses Tue, 16 Jun 2026 00:00:00 GMT A practical guide to Ray-Ban Meta and Oakley Meta AI glasses — what they do, how they differ, where to try them on at an offline store, and which one is right for you. AI glassesMetaRay-BanOakleysmart glasseswearables https://lieftech.dev/blog/2026-06-16-future-of-xr-industry https://lieftech.dev/blog/2026-06-16-future-of-xr-industry Tue, 16 Jun 2026 00:00:00 GMT A grounded look at where the XR industry is heading — key players, AI-powered glasses replacing phones, spatial OS adoption, real challenges, and a realistic 3–5 year outlook. XRARVRAIMetaApplespatial computing https://lieftech.dev/blog/2026-06-16-apple-intelligence-whats-new https://lieftech.dev/blog/2026-06-16-apple-intelligence-whats-new Tue, 16 Jun 2026 00:00:00 GMT A practical overview of Apple Intelligence in 2026 — which devices support it, what features have landed, how it compares to the 2024 launch, and how everyday users actually benefit. Apple IntelligenceAIiOSSiriApplemachine learning https://lieftech.dev/blog/2026-06-16-ai-glasses-sdk-content-skills https://lieftech.dev/blog/2026-06-16-ai-glasses-sdk-content-skills Tue, 16 Jun 2026 00:00:00 GMT A practical guide for developers and content creators on which SDKs, APIs, and skills to learn when building apps or content for AI smart glasses like Ray-Ban Meta and Oakley Meta. AI glassesSDKMetadeveloper toolscontent creationsmart glasseswearables https://lieftech.dev/blog/2026-06-15-us-iran-ceasefire-fuel-surcharge https://lieftech.dev/blog/2026-06-15-us-iran-ceasefire-fuel-surcharge Mon, 15 Jun 2026 00:00:00 GMT How US-Iran peace negotiations affect oil prices — and what that means for fuel surcharges in shipping and logistics. US-Iranceasefirefuel surchargeoil pricegeopoliticsshippinglogistics https://lieftech.dev/blog/2026-06-15-neural-3d-rendering-nerf-gaussian-splatting https://lieftech.dev/blog/2026-06-15-neural-3d-rendering-nerf-gaussian-splatting Mon, 15 Jun 2026 00:00:00 GMT A technical deep-dive into neural 3D rendering — how NeRF and Gaussian Splatting work under the hood, how they are trained, and a survey of commercial services and open-source tools available today. AI3DNeRFGaussian Splattingcomputer visionneural renderingvolume rendering https://lieftech.dev/blog/2026-06-14-retrospective-on-the-second-week-of-june-26 https://lieftech.dev/blog/2026-06-14-retrospective-on-the-second-week-of-june-26 Sun, 14 Jun 2026 00:00:00 GMT Retrospective https://lieftech.dev/blog/2026-06-14-ar-vr-xr-device-landscape-overview https://lieftech.dev/blog/2026-06-14-ar-vr-xr-device-landscape-overview Sun, 14 Jun 2026 00:00:00 GMT A concise reference covering commercially available AR, VR, and XR headsets in mid-2026 — key specs, use cases, and notable differences. ARVRXRspatial computingApple Vision ProMeta QuestSamsung Galaxy XRhardware https://lieftech.dev/blog/355 https://lieftech.dev/blog/355 Sat, 13 Jun 2026 00:00:00 GMT Korea's unique deposit-based rental system is shrinking. Understanding why — and what's replacing it — matters for anyone renting or buying in the current market. JeonseKorea Real EstateRental MarketHousing전세 https://lieftech.dev/blog/354 https://lieftech.dev/blog/354 Sat, 13 Jun 2026 00:00:00 GMT Every AI company needs TSMC. Only one TSMC exists. Understanding that dependency is the starting point for understanding almost any AI hardware investment. TSMCAISemiconductorsStock AnalysisSupply Chain https://lieftech.dev/blog/352 https://lieftech.dev/blog/352 Fri, 12 Jun 2026 00:00:00 GMT If you're investing in Korea without an ISA, you're paying taxes you don't have to. Here's what the account does and why it's worth ten minutes of setup. ISAIndividual Savings AccountTax-FreeInvestmentKorea Finance https://lieftech.dev/blog/351 https://lieftech.dev/blog/351 Fri, 12 Jun 2026 00:00:00 GMT Seoul has been trying to solve its housing supply problem for decades. Here's why each solution takes longer than the problem it's trying to address. SeoulReal EstateApartment SupplyReconstructionKorea https://lieftech.dev/blog/347 https://lieftech.dev/blog/347 Thu, 11 Jun 2026 00:00:00 GMT Real EstateKoreaMortgageHousehold DebtRegulation https://lieftech.dev/blog/346 https://lieftech.dev/blog/346 Thu, 11 Jun 2026 00:00:00 GMT NvidiaPhysical AIRoboticsStocksJensen Huang https://lieftech.dev/blog/344 https://lieftech.dev/blog/344 Wed, 10 Jun 2026 00:00:00 GMT Real EstateProperty VisitHome BuyingChecklistSite Inspection https://lieftech.dev/blog/343 https://lieftech.dev/blog/343 Wed, 10 Jun 2026 00:00:00 GMT StocksAerospaceRocket LabSharp DropSpaceX https://lieftech.dev/blog/342 https://lieftech.dev/blog/342 Wed, 10 Jun 2026 00:00:00 GMT FinanceWelfareEnergy VoucherHeatwaveVulnerable Groups https://lieftech.dev/blog/2026-06-10-what-would-be-make-next-as-a-it-company-owner https://lieftech.dev/blog/2026-06-10-what-would-be-make-next-as-a-it-company-owner Wed, 10 Jun 2026 00:00:00 GMT makenextasITcompanyownerThoughtsthought