标签：#AI

Most developers have experimented with ChatGPT or GitHub Copilot. But when it comes to building AI-powered applications, simply calling an LLM API isn't enough. Understanding what's happening behind the scenes helps you design systems that are scalable, reliable, and cost-effective. In this article, we'll explore four concepts every software engineer should know: tokens, embeddings, transformers, and Retrieval-Augmented Generation (RAG). 1. LLMs Think in Tokens, Not Words One of the biggest misconceptions about Large Language Models (LLMs) is that they understand words like humans do. In reality, they process tokens, which are smaller units of text. For example: Prompt: Explain dependency injection in Spring Boot. is first converted into a sequence of tokens before the model processes it. Why does this matter? API pricing is based on the number of input and output tokens. Longer prompts increase latency and cost. Every model has a maximum context window measured in tokens. When building AI applications, prompt design isn't just about getting better answers—it's also about optimizing performance and cost. 2. Transformers: The Breakthrough Behind Modern AI Before 2017, language models processed text one word at a time using architectures like RNNs and LSTMs. They struggled with long conversations because earlier context was gradually forgotten. The introduction of the Transformer architecture changed this with a mechanism called self-attention. Instead of reading text sequentially, transformers analyze the relationships between all tokens in a sentence simultaneously. Consider this sentence: "The server restarted because it ran out of memory." The model understands that "it" refers to "the server", not "memory", by assigning attention to the relevant words. This ability to capture context efficiently is what powers modern LLMs like GPT, Gemini, Claude, and Llama. 3. Embeddings Enable Semantic Search Suppose a customer searches: "How can I get my money back?" But your

AWS launched Lambda MicroVMs, a new serverless compute primitive that runs each user session or AI agent in its own Firecracker virtual machine with hardware-level isolation, snapshot-based rapid launch, and state preservation for up to eight hours. Reddit community analysis found the minimum setup costs $3.03/day, roughly 9x Fargate spot pricing. By Steef-Jan Wiggers

New OpenAI Signals data shows how ChatGPT adoption is growing globally, with users increasing usage, exploring more capabilities, and driving growth across regions and languages.

OKX is bringing together payments, identity and reputation into a marketplace for AI agents.

Workshops at this year's AI Engineer World's Fair shifted noticeably away from RAG and prompt...

I'm sitting through day one of AI Engineer World's Fair San Francisco, and I'm struck by how...

San Franciscans and attendees at the AI Engineer World's Fair saw a shining swarm of drones flying...

On Sunday night, the sold-out 2026 AI Engineer World's Fair kicked off its orientation at Moscone...

AI agents are hitting the same inflection point. Most people think an agent is the model, the...

A few months ago I was applying for jobs and stumbled across Jobscan. It looked exactly what I needed — paste your resume, paste the job description, see how well you match. Then I saw the price. $49.95/month. As a student, that's a week of groceries. I closed the tab. But the problem didn't go away. I kept wondering — why is my resume getting rejected before a human even reads it? ATS systems are filtering people out and nobody tells you why. So I built ClearScan. What it does: Scans your resume against a job description. Shows exactly which keywords you're missing. Checks ATS compatibility across 5 platforms (Workday, Taleo, Greenhouse, Lever, iCIMS). Scores your bullet points using STAR format analysis. Gives you a transparent breakdown — you can see why you got the score you did. That last part matters to me a lot. Most tools just give you a number. ClearScan shows you the math. Where it stands: Launched today. First paying customers already. Free tier gives you 2 scans/month — enough to feel the product before deciding. Pricing starts at €3.99/month. Built for students, priced for students. Live at clearscan.fyi — would genuinely love your feedback, especially from developers who've dealt with ATS hell themselves.

It was during a live client demo. The AI was mid-session. The user was answering questions. Everything was going perfectly. Then — this: "Sorry, there was an error processing your request. Please try again." The client looked at us. My manager looked at me. I looked at my laptop and wanted to disappear. The Investigation First thing I checked: OpenAI dashboard. No failed runs. Nothing. I checked our server logs. There it was: run_timeout — after exactly 60 seconds But here's the thing — the run wasn't failing. It was just slow. OpenAI was still processing. Our backend gave up at 60s. OpenAI finished at 87s. We quit too early. Why Does This Happen? The longer a session gets, the more history OpenAI has to process. Early in a session: 3–5 seconds. Mid-session (10+ messages): 30–50 seconds. Long sessions: 60–90+ seconds. Our hardcoded limit of 60 seconds wasn't matching reality. The Fix Step 1: Made the timeout configurable via environment variable. # .env OPENAI_RUN_TIMEOUT_MS=150000 Step 2: Updated the polling loop to use it. const TIMEOUT_MS = parseInt ( process . env . OPENAI_RUN_TIMEOUT_MS ) || 150000 ; const TERMINAL = [ ' completed ' , ' failed ' , ' cancelled ' , ' expired ' , ' requires_action ' ]; while ( ! TERMINAL . includes ( runStatus . status )) { if ( Date . now () - startTime >= TIMEOUT_MS ) throw new Error ( ' run_timeout ' ); await new Promise ( r => setTimeout ( r , 1000 )); runStatus = await openai . beta . threads . runs . retrieve ( threadId , run . id ); } Step 3: Deployed. No more errors. Lessons Learned Always handle ALL 5 terminal states — not just "completed" Never hardcode timeouts for AI workloads — they vary by session length Your error logs and OpenAI dashboard together tell the full story What's Next I'm exploring runs.stream() — streaming responses in real time, no polling, no timeouts. Will write a follow-up once it's in production. Have you hit this before? How did you handle it? Drop it in the comments.

I had a bug last month that took most of a Saturday to find. A support bot we shipped started promising refund timelines that didn't match policy. Customer complaints, frantic Slack messages, the usual. The prompt had changed three weeks earlier. Nobody could remember why. Git blame pointed to a one-line edit inside a 200-line SYSTEM_PROMPT constant. No PR description, no diff worth reading. That's when I knew I'd been writing prompts wrong for the last two years. PromptOT - Prompt Management Platform Compose prompts from typed blocks, version safely, and deliver to your apps via API. The prompt management platform built for AI engineering teams. promptot.com Prompts are code, but we treat them like Notion docs A typical system prompt for anything useful crams five things into one string: You are a friendly support agent for Acme. Use this knowledge: {{kb}}. Follow escalation rules. Never share internal ticket IDs. Reply in plain text, two to four paragraphs. That's a role, context, instructions, guardrails, and an output format all jammed together. When the PM wants to soften the tone, they're editing the same string an engineer uses to update the knowledge base. When security adds a guardrail, it lands inches from the response format. One bad edit and every reply ships broken. We wouldn't write code this way. So why are prompts always a 200-line const somewhere in lib/ ? What I built PromptOT is a prompt management platform. The core idea is small: typed blocks instead of flat strings. You break a prompt into pieces. Each piece has a type — role, context, instructions, guardrails, output_format, custom. Each one is independently editable, can be toggled on or off, and has its own version history. The compiler joins them into a single prompt string at delivery time. Block 1 — role : " You are a support agent for Acme..." Block 2 — context : " Knowledge base: {{kb}}..." Block 3 — instructions : " 1. Acknowledge the issue..." Block 4 — guardrails : " Never share inte

OpenAI usage page, check spend. Anthropic console, check spend. Add it up in my head. Close both...

After a marathon 48 hours of coding, the winners of the AI Engineer World's Fair Hackathon have been...

For the last few years, many enterprise AI conversations have started with the same question: “Where can we add an AI copilot?” It is an understandable starting point. Copilots are familiar. They sit inside existing tools, help users draft content, summarize information, search documents, write code, or answer questions. For teams experimenting with AI, they feel safe. But after 10 years of building mobile apps, web platforms, AI systems, internal tools, and enterprise-grade products, I have learned something that sounds simple but changes the whole strategy: The workflow is the product. Not the chatbot. Not the prompt box. Not the model. Not the dashboard. The workflow. Enterprise AI only becomes valuable when it changes how work actually moves across people, systems, approvals, decisions, and data. That is why companies now need to move beyond standalone copilots and toward AI workflow automation, enterprise AI agents, and agentic workflows that are designed around real operational outcomes. Copilots Help. Workflows Transform. An AI copilot is useful when a person needs assistance inside a task. It can draft an email, summarize a meeting, search policy documents, or help an engineer understand code. These are valuable use cases. But they usually improve a single moment of work, not the complete business process. A workflow, on the other hand, connects the full chain. For example, consider enterprise customer onboarding. A copilot may summarize the sales call. A workflow system can take that summary, extract requirements, identify missing information, create onboarding tasks, notify customer success, update the CRM, generate a kickoff plan, check billing setup, and flag delivery risks. That is a very different level of impact. AI Copilot AI Workflow Automation Assists one user Coordinates work across teams Responds when asked Triggers actions automatically Works inside a tool Connects multiple systems Improves productivity Improves operating performance Helps with

A new standard for autonomous-agent commerce now has a live implementation, and it's worth reading closely - not because it competes with atomic settlement, but because it draws the line between two settlement philosophies more clearly than anything I've seen so far. The standard is ERC-8183 , the Agentic Commerce Protocol, launched earlier this year by the Ethereum Foundation's dAI team and Virtuals Protocol. The implementation is BNB Chain's BNBAgent SDK , which the team describes as the first live build of the spec (shipped on testnet in March 2026, mainnet pending). If you build for AI agents, both are worth understanding on their own terms. They're also the clearest mirror I've found for explaining what "atomic settlement" actually means. What ERC-8183 does ERC-8183 models commerce as a job with an escrowed budget . There are three roles: a Client who posts the job and funds it, a Provider who performs the work, an Evaluator - a designated third party who decides whether the work was completed. The job moves through four states: Open → Funded → Submitted → Terminal . The client funds the budget into escrow. The provider submits a deliverable. Then the evaluator - and only the evaluator - attests that the job is complete (or rejects it), and the escrow releases accordingly. If the job expires, the client gets refunded. This is a sensible design for a real class of problems. A lot of agent "commerce" is genuinely work-for-hire: do a task, produce a deliverable, get paid if it's acceptable. Acceptability is subjective, so you need someone to judge it. ERC-8183 makes that judge a first-class role and standardizes the lifecycle around it. BNBAgent SDK goes further and routes disputes through UMA's data-verification mechanism, adding an arbitration layer the base spec deliberately leaves out. So far, so reasonable. The interesting part is the assumption baked into the shape of it: someone has to decide that the deal is done. What atomic settlement removes Now hold th

There’s a specific moment that happens at every single hackathon. It’s usually around 2 or 3 a.m.,...

I needed faster edits for technical diagrams, and a lower recurring overhead for recurring visuals. I stopped asking for new images for everything. That change started the moment I replaced "generate now, tweak later" with a fixed 8-tool matrix. TL;DR: I moved recurring illustration work into seven scriptable stacks + one 3D stack and kept image-generation AI only as a fallback. Why I rewrote this workflow When I edited an article recently, I was spending too much time redoing the same visual shape in slightly different versions. The same chart logic should not need prompt guessing each time. I asked myself: Can this be represented as text or code? Can I regenerate it exactly when requirements change? Do I need raw design freedom, or do I need deterministic structure? If the answer was mostly "text/code + deterministic output," I did not open an image-generation model first. I also kept one practical boundary: this was not an academic tool roundup. This is a log of what I actually used and in what context. The number that changed my mind: an 8-tool decision matrix The number I now defend is exactly 8 . Instead of inventing synthetic savings, I evaluate every new illustration request against this matrix. Tool Best fit Why I pick it Mermaid flow, sequence, architecture notes fastest in markdown-native writing PlantUML UML-heavy docs strict structure when Mermaid gets too loose Markmap map-style summaries converts headings directly Graphviz dependency and direction graphs compact graph semantics matplotlib numeric visualizations source-of-truth from data tables Pillow labels, badges, annotations deterministic pixel edits in Python D3.js node/link or hierarchy interactions data-driven relationship rendering Blender 3D explanatory graphics stronger structural clarity for complex scenes This is the exact set I now reach for before any image-generation request. What happened first: practical snippets I am including small runnable snippets I can reuse. 1. Mermaid for determ

As the AI Engineer World's Fair Expo kicked off, a group of scientists gathered for an informal...

As the AI Engineer World’s Fair kicked off officially on Monday, the halls were filled for the...