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The main website of the language https://mojolang.org/ displays an announcement bar that says "Mojo will be open source soon! Join us at ModCon '26 for an update." submitted by /u/baldierot [link] [留言]

Research Context When doing low-level network programming in Assembly, you experience firsthand the immense chaos running behind the scenes of operations we solve with a single line in high-level languages (Python, C, etc.). While developing the Nested-ICMP-Communication Analysis project, specifically an Encapsulated ICMP framework, I hit exactly this kind of wall: extracting an IP address from a packet header and printing it to the screen in the correct format. Sounds simple, right? However, when x86 architecture and network protocols are involved, seeing 5.1.168.192 instead of 192.168.1.5 on your terminal is extremely common. So why does this happen, and what kind of algorithm did I develop to overcome this issue during the debugging process? Let's dive into the background. The Endianness Problem in Network Headers When you capture a packet coming over the network and read the source/destination IP address inside the sockaddr_in structure, the data arrives in Network Byte Order (Big-Endian) format. This means the most significant byte is stored at the lowest memory address. However, the x86/x64 processor architectures we use rely on Little-Endian (Host Byte Order). When the processor pulls this 4-byte IP data into a register, the reading direction is effectively reversed for our purposes. The result? A packet that arrives as 192.168.1.5 appears scrambled if we try to naively print it from memory. The inet_ntoa() function in high-level languages handles this conversion in the background. But if you are writing a custom sniffer in pure Assembly, you must do this conversion byte by byte yourself. Debugging Hell: The Problems Encountered While writing this conversion, I encountered a few critical issues that cost me hours in GDB (GNU Debugger): Register Clashes: While separating each octet (byte) of the IP address and converting it to an ASCII character (string), you must use the AX register for division operations (DIV). If you don't carefully manage your remainders

A few years back I was a junior dev on a car financing product, and I got handed the deal jacket. A deal jacket is the full picture of a deal. How much the buyer puts down, what the car is worth, the terms, all of it packaged up and sent to a bank so the bank can come back with a yes or a no. The flow I had to build would send that package to one bank, wait about a minute for an answer, check whether the offer that came back was any good, and if it wasn't, send the whole thing to the next bank. A pipeline. Under the hood it was a recursive call with state managed in between, talking to Route One on the other side. It kept breaking. I wrote it, tested it, read the logs, fixed one thing, watched it break somewhere else. Day three, day four, still broken. Then on the fourth day I hit send in Postman one more time, watched the logs roll past, and it just worked. The approval came back clean. I jumped out of my chair. I was loud enough that the whole room looked over, and the two guys who knew what I'd been stuck on for four days were already grinning, because they knew exactly what had just happened. That feeling is the whole reason I'm writing this. Not the code. The feeling. The joy had two parts, and I only saw the second one once it was gone The first part is obvious. It's the problem solving. The thing fought back for four days and then it didn't, and I had beaten it. You chase a bug through the logs, you argue with it, and at some point it gives. That is a real high and every engineer knows it. The second part is quieter. I built that. Me. Back then if I shipped something, even a plain HTML page, it was mine end to end. I had to learn HTML before I could build the page, so the page was proof that I had learned. You could point at the thing and say that came out of my head and my hands, and nobody could take that from you. So the joy was solving the problem, and it was owning what you solved. That second part is the one that broke. Same problem, four years apart Ta

The Steam Summer Sale is underway.

Hi, friends! Welcome to Installer No. 134, your guide to the best and Verge-iest stuff in the world. (If you're new here, welcome, hope you're okay in all this heat, and also you can read all the old editions at the Installer homepage.) This week, I've been reading about Polymarket lies and Jalen Brunson and […]

What's the Password? has a simple concept: To solve each of the game's more than 100 puzzles, you have to type in the right four-digit password on a number pad. That might sound like a limited constraint. But the simplicity gives solo developer Dan DiIorio, better known as TrampolineTales, lots of room to play with […]

Package managers aren't as interchangeable as they seem. This post digs into the real differences in how npm, Yarn, pnpm, Bun, and Deno handle dependencies under the hood and why that matters when things break in practice. submitted by /u/OtherwisePush6424 [link] [留言]

Every side project starts the same way. -Generate an OpenAI key. -Add it to .env. -Write a...

The Amble One is a street-legal $25,000 electric buggy designed for luxury resorts.

AWS has recently announced the AWS Workload Credentials Provider to automatically deliver and refresh certificates and secrets for applications. The open source tool reduces the need for custom automation, helps prevent outages caused by expired certificates, and works in both AWS and non-AWS environments. un By Renato Losio

Everyone is sick of spam calls and creeper sites that show weirdos where you live—but can any service solve it?

submitted by /u/gregorojstersek [link] [留言]

Email authentication has been "solved" on paper for years. SPF, DKIM, and DMARC are old standards, every deliverability guide repeats them, and Google and Yahoo made DMARC effectively mandatory for bulk senders in 2024. So I expected the top of the web to be in good shape. In June 2026 I ran SPF, DKIM, DMARC, and MTA-STS checks across the Tranco top 10,000 domains, using public resolvers (1.1.1.1 and 8.8.8.8) and the same checks my own tool runs. The records are public DNS, so anyone can reproduce this. The picture is worse than the "solved problem" framing suggests, and the interesting part is not adoption, it is where people stop. A third of the top 10k still have no DMARC 3,318 of the 9,937 domains that resolved (33.4%) publish no DMARC record at all. These are not obscure sites, they are the most-visited domains on the web. Without DMARC a receiver has no published instruction for what to do when SPF and DKIM fail, and you get none of the aggregate reporting that tells you who is sending as you. It does get better at the very top. Among the top 1,000 domains, 28.4% have no DMARC, versus 34% across the rest of the 10k. Better, not good. The real problem is p=none, not missing records This is the number that actually matters. Of the 6,619 domains that do publish DMARC, only 46.5% are at p=reject . About a quarter (26%) are still sitting at p=none . p=none is monitor-only. It asks receivers to report what they see and to enforce nothing. It is the correct first step: publish p=none , collect aggregate reports, fix the sources that should be passing, then tighten the policy. The trouble is that p=none is also where most deployments quietly stop. The reports start arriving, nobody reads them, and the domain sits unprotected behind a policy that does nothing while looking like progress. Moving from p=none to p=reject is the step that turns DMARC from a dashboard into a defense, and it is the step most people never finish. I wrote up the safe way to make that move , si

Operating system, a thing that everybody uses but no one talks about. While reading Operating Systems: Three Easy Pieces (OSTEP), my background in C and C++ fueled a growing fascination with memory allocation, virtualization, scheduling, and the intricate mechanics of operating systems. This would be a series of article, the number i am not sure, it will be the amount of content that someone might comfortably read in a 10 min Article. Keeping each piece to a solid 10-minute read is the perfect sweet spot for a developer to read over a cup of coffee. It gives you enough runway to explain a core concept, show the math, and link a practical C/C++ experiment without making their eyes glaze over. Why this Article ? We are often warned against “reinventing the wheel.” However, I firmly believe that building and optimizing modern software is impossible without a fundamental grasp of virtualization, memory allocation, and concurrency. Consider Docker: it functions almost entirely on OS-level virtualization features like Namespaces, cgroups, and isolated filesystems. Similarly, the highly optimized Memory Manager in PostgreSQL only works because it leverages the robust memory management systems already written into the OS kernel. This article aims to bring the core concepts of OSTEP to life through practical experimentation. By accompanying the theory with an open-source repository, my goal is to provide a clear, interactive learning experience that demystifies operating systems. I am not an operating system guru or a Principal Engineer with years of experience, but I hope to become one someday (assuming AI doesn’t replace me first… HeHe ). What I can do is dive in, explore, and try to understand these concepts by actually building things. Because of that, my goal here is to present the findings and experiments I explore rather than giving strong opinions — I’ll leave the comment section for those! Any support, feedback, or contributions from the community will be incredibly

I've been using Home Assistant for a few years and Trading212 for longer than that. It was inevitable these two things would end up connected. The Trading212 API is surprisingly good — portfolio value, individual positions, pies, dividends, all there. So I wrote a custom integration to pull it all into HA as sensors, then a Lovelace card to make it actually look decent on a dashboard rather than a wall of entity rows. The card does zero-config auto-discovery which was the bit I spent the most time on. You drop it on a dashboard and it finds your sensors automatically — no copying entity IDs, no manual config unless you want it. Five card types: portfolio overview with a sparkline, scrollable positions list, pies with goal progress, and a combined one if you want everything in one card. The sparkline was fiddly. HA's recorder only writes state changes, not regular samples, so if your portfolio value is flat between polls the chart has gaps. Had to smooth over those client-side. The part I use most though is the automations. Every weekday at 8am Alexa tells me where I stand: action : - action : notify.alexa_media_kitchen data : message : > Portfolio is worth {{ states('sensor.trading212_total_value') | float | round(0) | int }} pounds. Today you are {% if states('sensor.trading212_pnl_today') | float >= 0 %}up{% else %}down{% endif %} {{ states('sensor.trading212_pnl_today') | float | abs | round(2) }} pounds. data : type : tts And Friday at 6pm I get the weekly version with P&L for the week and which position moved the most. I like that it just tells me — if the market's had a bad week I'd probably avoid opening the app, but Alexa doesn't give me the option to ignore it. Both the integration and the card are on GitHub. The card is in HACS as a custom repo while it waits for default catalogue approval: https://github.com/Smart-Home-Assistant-UK/lovelace-trading212-card I wrote up the full setup with all the automation YAML here if you want to copy the whole thing: ful

The 9 PM Teams call layoffs that vaporized an entire India engineering office aren't merely a cautionary tale—they are a case study in remote-first management rot. Around 150 employees were invited to a surprise Microsoft Teams call late in the evening and informed, without any prior warning, that their team was being shut down and the company was closing its India operations 1 [^2]. No severance. No transition. Just a kill switch flipped from a different timezone. This isn't a single rogue employer. It’s a playbook. The late-night call exploits the timezone gap to avoid in-person confrontation and suppress immediate collective response. It’s a clean, cowardly sever for a leadership class that has confused “remote” with “disposable.” How the 9 PM Teams call layoffs became a remote-first weapon The mechanics are always the same: a sudden, mandatory all-hands drops on calendars minutes before it starts. The meeting is short. An HR representative or a pre-recorded executive message delivers the news. Access is cut before anyone can ask a real question[^1:0][^2:0]. A former employee detailed the sequence in a viral social media post: “Around 150 members of our engineering team were invited to a 9 PM Microsoft Teams call, where we were informed that our team was being shut down”[^3]. The shock isn't accidental—it’s functional. Surprise prevents organizing. It prevents screen-recording. It prevents the kind of immediate, unified pushback that might force a negotiation on severance or notice periods. Red flag: When your office is “the offshore office” The structural vulnerability is clear. In many global firms, India operations function as a cost center rather than a strategic core. The moment a CFO runs a spreadsheet and sees a quick path to positive EBITDA by zeroing out a foreign subsidiary, the engineers there become a line item. The 9 PM Teams call layoffs are the logical endpoint of this relationship: the timezone isn't just a scheduling inconvenience, it’s a control

TL;DR If the Vercel CLI keeps trying to open a dev link against your Vercel project during local next dev runs, set VERCEL_EXPERIMENTAL_DEV_SKIP_LINK=1 in the shell that launches the dev server, or add it to .env.local at the project root, and restart the process. The flag is opt-in, all-uppercase, and only affects local CLI behaviour. It never reaches your deployed build, and the production runtime on Vercel does not read it. If the CLI still tries to link after a restart, scroll to Debugging when the skip link isn't working for the version-compatibility and process-tree checks that catch the cases the basic setup misses. I have shipped this flag in three production monorepos and the same four mistakes account for almost every "I set it and it did nothing" report I see. What VERCEL_EXPERIMENTAL_DEV_SKIP_LINK actually does VERCEL_EXPERIMENTAL_DEV_SKIP_LINK is an opt-in environment variable the Vercel CLI honours when it runs alongside a local Next.js dev server. Its job is narrow: tell the CLI to skip the step where it would normally reach out to Vercel and create or refresh a dev link against your Vercel project. A "dev link", in the Vercel sense, is a local connection record that lets vercel dev and some Vercel-only local emulators (KV, Postgres, Edge Config) pull real values from a Vercel project. It is useful when you want production-shaped data during development, and a real annoyance when you do not — for example in CI sandboxes, offline laptops, monorepo workspaces that share a single project, or any time you want next dev to behave like a plain Node process without the CLI wrapping it. The variable is shipped under the VERCEL_EXPERIMENTAL_ namespace, which Vercel uses to mark features that can change between CLI versions. That has two practical consequences: the name must be uppercase with underscores, and you should not build production logic on top of it. I treat it like a local-dev knob, set per shell session, and never check it into CI as a hard dependen

Cutting OpenAI Costs From Scratch: What Nobody Tells You Three months ago I sat down with my finance lead and watched her scroll through our OpenAI invoice. The number was $14,200 for the month. That was the moment I knew we had a problem. Not a "maybe we should optimize" problem — a real, existential, "this kills our margins before we hit Series B" problem. I run a B2B SaaS platform that does a lot of LLM-powered document processing. Summarization, extraction, classification, the boring stuff that makes real money but burns tokens like crazy. We were routing everything through GPT-4o because, honestly, it was the path of least resistance when we started. Then the bills started arriving. This is the story of how I cut our LLM spend by 97%, the architecture decisions that made it possible, and the things I wish someone had told me before I started. The Math That Made Me Sweat Let me put actual numbers on the table. Here's what I was paying versus what I pay now: Model Provider Input $/M Output $/M vs GPT-4o GPT-4o OpenAI $2.50 $10.00 — GPT-4o-mini OpenAI $0.15 $0.60 16.7× cheaper DeepSeek V4 Flash Global API $0.18 $0.25 40× cheaper Qwen3-32B Global API $0.18 $0.28 35.7× cheaper DeepSeek V4 Pro Global API $0.57 $0.78 12.8× cheaper GLM-5 Global API $0.73 $1.92 5.2× cheaper Kimi K2.5 Global API $0.59 $3.00 3.3× cheaper Look at that DeepSeek V4 Flash row. 40× cheaper than GPT-4o. For comparable quality on the workloads I was running. I had been leaving 97.5% of my budget on the table. Doing the mental math: a $500/month OpenAI bill becomes $12.50. My $14,200 bill? Theoretically $355. That's not optimization, that's a different business. Why I Almost Didn't Do It Here's the thing nobody tells you about cost optimization at a startup: it's not a technical problem, it's a willpower problem. The reason I was paying OpenAI 40× too much wasn't because their API is hard to use. It was because switching felt risky. I had deadlines. I had a roadmap. I had investors asking about g

Originally published on the Keylight blog . A short founder note on why Keylight exists. Every product starts as somebody's unsolved problem; this is mine, and if you are shipping a paid app you have probably run into the same one. The problem I kept hitting I wanted to sell a desktop app directly. Not through the App Store — directly, to customers I could actually talk to. The payment side was easy: Stripe is excellent and the decision took an afternoon. Then I got to licensing, and everything slowed down. Stripe takes the money. It does not give you a license key. It does not sign anything your app can verify. It does not know what a device activation is. The moment a customer has paid, you are on your own: you need to mint a key, sign it so it cannot be forged, deliver it, let the app check it, track devices, and revoke it on a refund. None of that is payment processing, so none of it is in Stripe. So I looked at the platforms that do bundle licensing. Why the merchant-of-record platforms did not fit Paddle, Gumroad, and Lemon Squeezy all advertise license keys. I looked hard at each, and the same three problems came up. The fee. As merchants of record they charge around 5%, against Stripe's ~2.9%. On every sale, forever. Reasonable if it solved my problem well — but it did not. Offline validation. This was the dealbreaker. Their licensing is built around an online validation API: to check a key, the app calls the platform's server. My app is a desktop app, and desktop apps run on planes, behind firewalls, and offline. An online-only check leaves no good option. Fail closed — refuse to run without a server response — and a paying customer who is simply offline cannot use what they bought. Fail open — keep running when the server is unreachable — and the check is trivially bypassed: block the app's network access and it can never re-check the license or learn it was revoked. The app never actually verifies anything itself; it only knows what the server last told i

Originally published on the Keylight blog . The thing that stops developers from moving their licensing isn't the work. It's the fear of one specific moment: a paying customer opens the app after you've switched, and it tells them they're unlicensed. That's the nightmare — you reach for lower fees and customer ownership, and the bill comes due as a wave of "I already paid for this" support tickets. It's a reasonable fear, and it's also avoidable. Migrating onto Keylight doesn't require invalidating anything, re-issuing anything, or asking customers to do anything. This post is about the one rule that keeps everyone working, the two situations you might be in, and why a scary-sounding "major version" jump changes none of it. When you're ready for the click-by-click mechanics, the companion piece covers them: How to Import an Existing Customer Base into Keylight . Why migrating licensing feels risky A license check is binary in the moment a customer experiences it: the app either lets them in or it doesn't. So any change to the system behind that check feels like it's playing with a live wire. Switch the layer that answers "is this person allowed in," the thinking goes, and you risk every existing customer getting the wrong answer at once. That instinct is right about the stakes and wrong about the mechanism. The wave of lockouts people picture comes from one specific mistake: treating migration as a cutover , where the old keys stop being recognized the instant the new system goes live. If your migration invalidates the old keys, yes — everyone breaks. The entire trick is to not do that. The one rule: old keys stay valid Here's the rule the whole migration hangs on: you bring your customers' keys in as they are, and nothing gets invalidated. When you import an existing customer, their license is a live, active record from the first second. If you include the key string they already have, that key is what Keylight stores — not a replacement. So when your new build ask