In the world of wearable health technology, the holy grail has always been moving intelligence from the cloud to the edge. Waiting for a cloud server to analyze your heart rhythm is not just a latency issue—it's a privacy and battery life concern. Today, we are diving deep into TinyML , Edge AI , and ECG signal processing to build a real-time abnormality detector. By leveraging TensorFlow Lite for Microcontrollers and the versatile ESP32 , we can process raw electrocardiogram (ECG) data locally. This approach ensures low-latency detection of arrhythmias while keeping sensitive medical data on-device. If you've been looking to bridge the gap between high-level deep learning and low-level embedded systems, you're in the right place! The Architecture: From Raw Signal to Insight 🏗️ The pipeline involves capturing a high-frequency analog signal, cleaning it, and feeding it into a quantized Convolutional Neural Network (CNN). Here is how the data flows through our ESP32: graph TD A[Raw ECG Signal/Sensor] -->|ADC Sampling| B(Preprocessing: Bandpass Filter) B --> C{Buffer Management} C -->|Windowed Segment| D[TFLite Micro Inference Engine] D --> E{CNN Model Classification} E -->|Normal| F[Log: Sinus Rhythm] E -->|Abnormal| G[Trigger Alert: Arrhythmia] G -->|Bluetooth/Wi-Fi| H[Mobile Dashboard] Prerequisites 🛠️ To follow this advanced guide, you'll need: Hardware : ESP32 (DevKit V1 or similar). Sensor : AD8232 ECG Module (or simulated ECG data). Software : Arduino IDE or PlatformIO. Frameworks : TensorFlow Lite for Microcontrollers (TFLM), EloquentTinyML (optional wrapper), or the standard C++ TFLM library. Step 1: Model Training & Quantization 🧠 Before we touch the C++ code, we need a model. Typically, we use the MIT-BIH Arrhythmia Database to train a 1D-CNN. The crucial step is Post-Training Quantization . Since the ESP32 doesn't have a dedicated NPU, we convert our 32-bit float model into an 8-bit integer (INT8) model. This reduces the size by 4x and speeds up inference s

When Logs and Metrics Aren't Enough You have great dashboards. Your log aggregation is solid. But when a user reports "the checkout page is slow," you still spend 30 minutes jumping between services trying to find the bottleneck. That's the gap distributed tracing fills. What Tracing Actually Shows You A trace is a complete picture of a single request as it flows through your system: User Request → API Gateway → Auth Service → Product Service → DB → Cache → Response 5ms 12ms 45ms 120ms 3ms ^ This is your bottleneck Without tracing, you'd see: API Gateway: latency looks fine Auth Service: latency looks fine Product Service: latency is HIGH but why? With tracing, you see the exact DB query inside Product Service that's taking 120ms. Getting Started with OpenTelemetry OpenTelemetry is the standard. Here's a minimal setup: # Python example with Flask from opentelemetry import trace from opentelemetry.instrumentation.flask import FlaskInstrumentor from opentelemetry.instrumentation.requests import RequestsInstrumentor from opentelemetry.instrumentation.sqlalchemy import SQLAlchemyInstrumentor from opentelemetry.sdk.trace import TracerProvider from opentelemetry.sdk.trace.export import BatchSpanProcessor from opentelemetry.exporter.otlp.proto.grpc.trace_exporter import OTLPSpanExporter # Setup provider = TracerProvider () provider . add_span_processor ( BatchSpanProcessor ( OTLPSpanExporter ( endpoint = " http://otel-collector:4317 " )) ) trace . set_tracer_provider ( provider ) # Auto-instrument everything FlaskInstrumentor (). instrument_app ( app ) RequestsInstrumentor (). instrument () SQLAlchemyInstrumentor (). instrument ( engine = db . engine ) That's it. Three auto-instrumentations cover 80% of what you need. Custom Spans for the Other 20% Auto-instrumentation gives you HTTP calls and DB queries. Add custom spans for business logic: tracer = trace . get_tracer ( __name__ ) def process_order ( order ): with tracer . start_as_current_span ( " process_order " ) as sp

We've all been here. A new form shows up, you install React Hook Form, add Zod or Yup, and in ten minutes you have something that "works." The problem doesn't surface that day. It surfaces three months later, when the same VIN you validate in the create car form also has to be validated in edit , in import from Excel , and it turns out the rule —"17 characters, the last 5 numeric"— is written three times, each one slightly different, and none of them lives in a place you can point to and say "here is what a valid VIN is." A typical form with a library looks roughly like this: const schema = z . object ({ vin : z . string (). length ( 17 , " The VIN must be 17 characters " ), miles : z . number (). min ( 0 , " Miles cannot be negative " ), // ...and 8 more fields }); const { register , handleSubmit , watch , formState : { errors }, } = useForm ({ resolver : zodResolver ( schema ), }); It works. But if you stop to look at it, you're paying three costs that almost never get named: 1. Clean code dissolves. The business rule ends up scattered across the schema , the resolver , the register calls, the Controller s, and the JSX. The knowledge — what makes a car valid — has no home. It's wired into the UI. And what's wired into the UI doesn't get reused: it gets copied. 2. Performance and coupling are paid silently. These libraries live on subscriptions: watch , re-renders on every keystroke, internal state to keep in sync. For a contact form, who cares. For a screen with 15 fields, sub-forms, and cross-field validation, your component is tied to the library's lifecycle —not yours— and you start fighting it instead of using it. 3. Developer convenience is a trap. It's wonderfully convenient at first . But that same rule: how do you test it without mounting a component? How do you move it to the backend? How do you translate it into two languages without polluting the schema? Everything the library gave you for free, it charges you for the day you need to step outside its mo

So this weekend I spent $200 solving a $2 problem. Not because I was careless. Not because the system was broken in the old way. It happened because the tool was powerful, fast, confident, and wrong for just long enough. That is the strange thing about AI systems. They do not always fail loudly. A cloud server goes down, an alert fires, a dashboard turns red, someone opens an incident bridge, and the team knows what kind of movie they are in. AI failure is softer. The answer looks useful. The workflow keeps moving. The agent tries another path. The model explains itself beautifully. The bill keeps climbing. With cloud reliability, we learned how to survive machines failing. We built retries, failover, backups, autoscaling, health checks, runbooks, and incident reviews. The cloud taught us that infrastructure is never perfect, so systems must be designed to bend without breaking. AI is teaching us something different. The machine may be running perfectly and still produce the wrong result. The API may be healthy, the latency may be fine, the token stream may complete, and the business outcome may still be bad. That is why AI Site Reliability is going to become its own serious discipline. It will not be enough to ask, “Is the model available?” We will have to ask, “Is the model still useful?” “Is it drifting?” “Is it spending too much?” “Is it using the right tools?” “Is it looping?” “Is it making the same mistake with more confidence?” “Is a human needed before this continues?” In the cloud world, uptime was the king metric. In the AI world, usefulness will matter just as much. A model that is always available but often wrong is not reliable. An agent that finishes every task but spends 100 times more than needed is not reliable. A chatbot that gives answers with perfect grammar but poor judgment is not reliable. The next generation of reliability engineering will care about cost, correctness, context, and control. Cost matters because AI turns thinking into metered

My kid said he wanted to do origami. I sent my Agent a single sentence asking it to handle the origami materials. It searched for tutorials on its own, printed out the origami guide along with sheets of paper. Later I wanted a different color, so I told it again, and it reprinted everything. From "I want to do origami" to having the materials in hand — under five minutes. In that moment, I felt that what changed might be more than just efficiency. The "Middle Steps" That Got Eliminated The origami isn't an isolated case. Lately I've noticed that the thing my Agent eliminates the most in my life is "middle steps." Market stall supplies. Before, when I received supply lists for my stall, things were scattered. Now the whole flow is connected: information comes in, gets automatically added to my shopping list assistant (another Agent of mine), and the items are already waiting in the shopping cart. Two scenarios, same pattern: before, you do N steps to get the result. Now you do 1 step — say "I want this." I call those eliminated N-1 steps middle management cost. What Is Middle Management Cost? It's not money. It's your attention and the number of decisions you make. Every time you open a search box, filter results, compare options, make a decision — your attention gets drained. Individually it's not much, but accumulated over a day, you feel "tired but haven't really done anything." That's the hidden damage of middle management cost. The logic of traditional tools is: I give you better tools, you do the work yourself. Better search engines, faster printers, more convenient shopping apps. But no matter how good the tools are, you're still the one running around in the middle. The logic of an Agent is: You tell me what you want, I'll handle it. Shift from humans adapting to tools, to tools adapting to humans. How Is This Different from Automation? Good question. Because the essence of automation is also "you just say it, the machine does it." The traditional automation

I got laid off in March 2026. The day HR handed me the 30-day notice, I had a small panic attack, then opened my laptop and started building things. Here's the deal: I had 30 days before severance ran out, and I wanted to see how much I could ship with AI tools before the money (and motivation) ran dry. I gave myself a single rule — every project gets a 7-day deadline, otherwise I kill it. I built 6 things. One has real users. One broke in production. Two I never opened again. This is what happened, in the order I built them. 1. AI Buddy (Chrome sidebar) — shipped, 15 users A Chrome extension that puts an AI assistant in a sidebar. Select text on any page, hit a keyboard shortcut, it goes to the AI, reply shows up without you leaving the page. Works with GPT-4, Claude, Gemini, DeepSeek. No login, no credit card. Time: 11 days (April 1–11). Status: Live on Chrome Web Store. 15 real users as of June 28, 2026. Rating 4.2. What I used AI for: 90% of the code (500 lines of JavaScript, written in Cursor). The README, the Chrome Web Store description, the marketing tweets — all AI-drafted, then I rewrote the parts that sounded like AI. What went wrong: The first version had a Stripe integration. AI wrote 90% of the webhook signature verification. I had to rewrite it from scratch. Also the model-picker UI went through 5 revisions because AI kept proposing what looked right but didn't work. → Chrome Web Store 2. Weekly report generator — personal use only Every Friday at 4pm, a script grabs my git commits, Slack messages, and Linear ticket changes, throws them at GPT-4, and asks for a "manager-readable" weekly report. I review, tweak, send. Time: 2 days. ~200 lines of Python. Status: Running for 11 weeks. Has 1 user. Me. Cost is $0.12/week. What I used AI for: The prompt. It's surprisingly tricky to get GPT-4 to write a weekly report that doesn't sound like a robot. The single most useful line: "if you don't have data, write 'no progress this week' — don't make things up." T

Labeled break/continue is now live across the entire Cx language stack. From the lexer to the JIT, two commits streamlined the implementation into a complete vertical slice. No parts left out, no corners cut—everything just works. The lexer seam If you're handling character literals and labels in the same codebase, you'll know what a pain this can be. We opted for a Rust-like syntax: 'ident for labels, with no closing quote. The label regex sits right after LiteralChar in the logos enum. Thanks to longest-match, 'x' becomes a char literal, while 'outer is parsed as a label. Escape sequences? They can't match labels because they have a backslash, making 'x' always look cleaner in code. A test fixture ( t_char_literal_guard ) ensures this order and regex integrity hold. Change the lexer rules, and it'll catch any mistakes immediately. Two-commit split We didn't cram this into a single mega-commit. No, we split it into two. Commit f94c6a5 laid down the frontend groundwork—adding the Label token, allowing loops and breaks to carry optional labels, and rejecting any misuse with semantic checks. The interpreter and JIT, however, initially took a back seat, guarding themselves against mislabeled jumps. Then came commit 0f56f1e , which wiped out these guards and enabled real execution on backends. Now all parses and semantic checks play nicely without rogue labeled breaks sneaking into the wrong loops. Interpreter changes The interpreter now handles BreakSignal and ContinueSignal carrying labels. Loops catch these signals when the label is either absent (defaulting to the innermost loop) or matches their own. The difference from before? Zero unlabelled break/continue behavior change while facilitating outward jumps. JIT changes The JIT saw more extensive adjustments, gaining a label field within LoopContext . Push and pop that context on a stack, trace it through lowering calls, and you've got labeled jumps pinpointed. The unlabeled jumps? They get the same treatment as bef

Circuit breakers and bulkheads are design patterns — their numbers are operational weapons. Failure ratio 50% or 30%? Max concurrent calls 25 or 100? During an outage the right answer changes hourly . Code the pattern once; tune thresholds live . Kiponos.io separates resilience structure (in Java) from resilience parameters (in live config tree). Pattern in code, numbers in Kiponos public boolean allowCall ( String downstream ) { var cfg = kiponos . path ( "resilience" , downstream ); return breaker ( downstream ) . failureRateThreshold ( cfg . getFloat ( "failure_rate_threshold" )) . waitDurationInOpenState ( cfg . getInt ( "open_seconds" )) . permittedInHalfOpen ( cfg . getInt ( "half_open_calls" )) . tryAcquire (); } Ops opens circuit sensitivity during brownout — dashboard edit, not redeploy. Resilience tree resilience/ payments-api/ failure_rate_threshold : 0.5 open_seconds : 30 half_open_calls : 5 bulkhead_max_concurrent : 40 inventory-api/ failure_rate_threshold : 0.35 open_seconds : 60 bulkhead_max_concurrent : 25 global/ force_open_all : false Extreme: coordinated degradation Platform SRE sets force_open_all: false normally. During regional disaster, flip selective open_seconds sky-high on non-critical downstreams — bulkhead by configuration , Java still executes pattern logic. Performance Breaker checks are per-call — getFloat() must be local. See rate limits article . Getting started Externalize Resilience4j YAML values to resilience/* Incident drill: tighten failure_rate_threshold live Resources: github.com/kiponos-io/kiponos-io Kiponos.io — resilience patterns with live numbers. Breakers that bend during the outage.

you've felt it. you type a prompt, hit send, and the response starts streaming in under a second....

The latest update to hermes-memory-installer introduces a focused set of features that directly address production-level concerns: observability, storage management, security, fault tolerance, and performance introspection. If you maintain a message-processing pipeline or job queue, these are the components that often decide whether your system survives peak loads or security audits without manual heroics. Let's break down each addition and how you can integrate them into your workflow. System Metrics Exposing runtime health is no longer an afterthought. The new metrics module taps into the core processing loop and emits standard Prometheus-formatted data: message throughput (count and rate), latency percentiles, queue depths, and goroutine or thread pool utilization. This isn't a simple "up/down" gauge—you get histograms for processing duration and derived metrics like consumer lag. For example, if you run multiple worker instances, you can now directly compare their processing speeds via a Grafana dashboard. The endpoint is configurable, so you can keep it behind a reverse proxy or internal load balancer. Memory pressure triggers a separate gauge for heap usage per queue, which helps with capacity planning before it becomes a midnight incident. Auto-Archive Without auto-archive, old messages accumulate in memory or primary storage, driving up costs and slowing down scans. This feature moves processed or expired messages to a cheaper tier (S3, GCS, or local file system) based on age or queue size. The archive process is a background task that runs on a cron-like schedule; you can define how many messages to retain per queue before archiving kicks in. The compression is transparent—gzip by default, but you can switch to snappy or zstd. A key detail: archived messages retain their metadata and can be restored if needed, though the replay path skips them automatically unless explicitly requested. This is useful for audit trails or multi-region cold replicas. Token Rot

Dealing with vendor invoices usually means someone is sitting there manually opening PDFs and typing...

Aprenda a substituir o velho Cron por systemd timers para ganhar logs nativos, controle de dependências e maior robustez.

Its now clear that we need to preserve tech press for non AI related things. Techmeme for example is now completely overrun with AI stories. HN is getting closer to that every day. If AI kickback deals, phony new model ratings, high RAM prices and your surprise at how you think you coded something with AI and it was AMAZING! even though it doesnt work is all there is count me out. We need a filter on existing tech news sites or an alternative press.

Like most developers, I have a set of tools I use every day. Most of them work great, and I don't...

Angular has signals now - and as of 19.2, even a signal-based way to fetch: httpResource, built on...