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If you're building something ambitious, this is a fast track to the people who can move your startup forward.

Full system design walkthrough: vì sao quy trình 5 bước quan trọng hơn thuật ngữ, và cái bẫy nhảy thẳng vào deep-dive Một buổi phỏng vấn system design 45–60 phút không đánh giá xem thí sinh biết bao nhiêu tên công nghệ, mà đánh giá xem thí sinh có xử lý được một bài toán mơ hồ theo một quy trình có kỷ luật hay không. Cùng đề "thiết kế URL shortener", người thất bại thường bắt đầu bằng "dùng Cassandra vì scale tốt" ngay ở phút thứ hai — chưa hỏi scale bao nhiêu, chưa biết read/write ratio, chưa đồng ý interface. Người pass đi theo một trình tự cứng: requirements → estimation → high-level → deep-dive → tradeoff . Cùng một đề, cùng thời lượng, nhưng người thứ hai dẫn dắt được interviewer thay vì bị dí. Bài này mô tả quy trình đó ở mức thực dụng, các thất bại thường gặp khi bỏ bước, và một hands-on end-to-end trên URL shortener để tự luyện. Cơ chế hoạt động Quy trình chuẩn được nhiều tài liệu tổng hợp (Alex Xu — System Design Interview vol.1; Donne Martin — system-design-primer ; Kleppmann — Designing Data-Intensive Applications ) đều có 4–5 bước gần như trùng nhau. Đây là khung 5 bước dùng thực tế trong phỏng vấn: Requirements clarification (~5 phút). Chốt functional requirement (hệ thống làm gì — API nào, use case nào) và non-functional requirement (availability target, latency target, consistency yêu cầu, security, cost). Không đoán — hỏi lại interviewer. Output: 3–5 gạch đầu dòng functional + 3–5 gạch NFR + danh sách "out of scope" (analytics, billing, ...). Back-of-the-envelope estimation (~5 phút). Tính DAU, QPS peak/avg, read:write ratio, storage growth theo năm, bandwidth. Không cần chính xác — cần đúng order of magnitude để quyết định "cần shard hay không", "cache có ý nghĩa không", "một node đủ hay phải scale ngang". High-level design (~10–15 phút). Vẽ box diagram: client → LB → app tier → cache → primary datastore → async worker → object storage/CDN. Định nghĩa API (endpoint, request/response, status code) và data model (schema chính, index chính). Ở bước này

From a massive DOGE data breach and the hacking of critical energy and water systems to the hack of an FBI surveillance system, here are the most damaging security incidents and data breaches of 2026.

The U.S. Army has fixed two of its websites that were hacked to display messages calling President Trump a "pedophile" and a "thief."

The hacking operations disclosed in a Canadian spy agency's annual report underscores some pressing national security threats facing the country and its top allies.

From cooling hybrids to organic latex beds, these are the mattresses WIRED reviewers actually sleep on and recommend.

“It is a direct attack on the rule of law,” says one European Parliament member of the new findings from Citizen Lab.

If you're going to apply for Startup Battlefield Australia, now is the time. Applications close July 6, and once the deadline passes, the opportunity is gone.

A top Democrat on the Senate's Intelligence Committee warned that the information accessed on a Homeland Security intelligence-sharing network may risk national security.

Record home battery installations unlock options for grids—and AI data centers.

DeepSeek has previewed its V4 model family, led by a 1.6 trillion-parameter flagship, and made a one-million-token context window the default across all its services. The weights are downloadable and self-hostable, putting frontier-scale long context in reach of smaller labs and individuals without per-token payment to a closed provider. Key facts What: DeepSeek previewed two free-to-download V4 models that can read a million tokens at once, no longer as a premium add-on but as the standard setting. When: 2026-06-29 Primary source: read the source A large language model has no persistent memory. Each time it answers, it re-reads everything in front of it — your question, the conversation so far, any documents you pasted — and that pile of text is the context. The context window is the hard ceiling on how much it can hold at once. For years that ceiling was a few thousand words, then tens of thousands. Pushing it to a million has been possible but expensive, usually sold as a special, pricey tier. DeepSeek's move is to make a million the everyday default. The family comes in two sizes. V4-Pro is the big one — 1.6 trillion parameters in total, but only about 49 billion of them switch on for any given word. That design is called a mixture of experts : instead of running the entire brain for every token, the model routes each piece of text to a small relevant subset of specialists, so it stays affordable to run despite its enormous size. V4-Flash is the smaller, cheaper, faster sibling, meant for everyday chat and quick edits, and DeepSeek says it keeps up with Pro on simpler agent tasks. Making a million-token window affordable comes down to how the model handles its KV cache — the running set of notes it stores about every previous word, which grows steadily the longer the conversation gets. At a million tokens those notes become a mountain of memory, and the model normally has to consult every note for every new word it writes. DeepSeek's approach, which they call sp

Honda wants in on the lucrative energy storage market. This week it began producing batteries destined for data centers, not driveways.

Smart speakers have spent the past few years searching for a compelling second act. Beyond music, timers, and controlling your lights, they've struggled to justify taking up space on the kitchen counter. AI promised to change that. Amazon debuted its new hardware powered by a revamped Alexa last fall, and now it's finally Google's turn. […]

A researcher found that using Anthropic’s Claude Opus 4.7, he could break into the website of Front Gate—used by every festival from Lollapalooza to Bonnaroo—and freely issue any ticket he chose.

What if one pitch changed everything? The next company nobody has heard of yet is building something that will matter. It could be yours.

First announced over a year ago in April 2025, the Busy Bar will be available for purchase starting on July 14th when the device also starts shipping. Created by the same team behind the Flipper Zero wireless multitool, the Busy Bar is instead described as a "productivity multitool" that relies on a pixelated LED display […]

Europe’s pro-competition proposals could see Google Search and Android systems opened up. The company claims there are serious privacy flaws.

Four years ago, overlooking a canal in Amsterdam, the smart home industry collectively launched Matter, the one interoperability standard to rule them all. Heralded as the solution to the industry's struggles, Matter was built on open standards and existing technologies and is the result of years of collaboration between traditional rivals, including Apple, Google, Amazon, […]

Plus: Former national security advisor John Bolton pleads guilty in classified-materials case, Microsoft helps take down major infostealer infrastructure, and more.

The hack on car giant Jaguar Land Rover last year was one the most disrupting, damaging, and costly hacks of the last few years.