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ProgrammingDEV Community ·

How to Replace Stock Price Polling with WebSocket Streaming in Trading Apps

A developer building a stock price dashboard discovered that polling an API every second caused lag and stale data, prompting a switch to WebSocket-based streaming. Modern trading APIs from providers such as Alpaca, Binance, and Polygon offer WebSocket endpoints that push market data instantly as trades and quotes occur. Unlike repeated GET requests, a persistent WebSocket connection lets the server deliver updates the moment they are available, eliminating polling delays. The article walks through a practical Python implementation using the websocket-client library to stream live AAPL trade ticks from Alpaca's data feed. Key challenges highlighted include managing reconnections, handling heartbeat signals, and avoiding missed ticks when a connection drops.

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ProgrammingDEV Community ·

CAdES vs XAdES: Why Choosing the Wrong Java Digital Signature Format Costs You

CAdES and XAdES are two distinct ETSI-compliant digital signature formats used in Java applications, and they are not interchangeable despite both being labeled 'advanced signatures.' CAdES, governed by ETSI EN 319 122, produces binary files and is suited for signing PDFs and other binary documents, while XAdES, governed by ETSI EN 319 132, produces XML and is widely used for electronic invoicing and XML contracts. The formats differ fundamentally in structure, file output, and the systems that can parse them, meaning a cryptographically valid signature can still fail validation if the wrong format was used. In several Latin American countries, for example, electronic invoicing systems specifically require XAdES because the invoice is already an XML document expecting an embedded signature node. Selecting the correct format must be determined upfront based on regulatory requirements and the receiving system's expectations, not patched after a validation error is returned.

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ProgrammingDEV Community ·

CAdES vs XAdES: Why Choosing the Wrong Digital Signature Format Breaks Validation

Digital signatures in Java can follow two distinct ETSI-compliant formats — CAdES and XAdES — which are structurally incompatible despite being marketed similarly. CAdES is a binary format based on CMS/PKCS#7, typically used for signing PDFs and arbitrary files, while XAdES is XML-based and widely used in electronic invoicing and XML contracts across Latin America. A technically perfect signature can still be rejected if the receiving system expects a different format, as the issue lies in format contracts rather than cryptographic validity. The author recounts submitting a detached .p7s file to a system expecting an embedded XML node, resulting in rejection despite a flawless signature. Developers are advised to confirm the expected format directly with the Certificate Authority before writing any code, not after encountering validation errors.

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ProgrammingDEV Community ·

Full Stack Intern Documents CSS Media Queries and Fluid Typography on Day 5

A full stack development intern shared learning notes from their fifth day, focusing on CSS media queries and fluid typography techniques. Media queries allow developers to apply different styles based on viewport size or device conditions, enabling responsive layouts that adapt across mobile, tablet, and desktop screens. The intern covered media types such as screen, print, and speech, along with common conditions like min-width, max-width, and orientation. Fluid typography was introduced as a method to make text sizes scale smoothly across viewport sizes using CSS units like rem and vw, along with the clamp() function. The post was published on DEV Community as part of an ongoing internship learning series.

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ProgrammingHacker News ·

Project Maps Webcams Along Path of 2026 Total Solar Eclipse

A web project has been created to catalog and map publicly accessible webcams positioned along the path of the 2026 total solar eclipse. The initiative aims to help people watch the eclipse remotely if they are unable to travel to the viewing zone. The project was shared on Hacker News, where it received modest early attention. Total solar eclipses follow a narrow geographic corridor, making webcam coverage a practical alternative for remote viewing. The 2026 eclipse is expected to be visible across parts of Europe and North Africa.

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ProgrammingHacker News ·

KidScreen App Lets Parents Curate a Controlled YouTube Video Shelf for Kids

KidScreen is a new app that allows parents to handpick a limited selection of YouTube videos for their children to watch. The tool aims to give parents greater control over their kids' video consumption by replacing the open-ended YouTube experience with a curated shelf. The project was shared on Hacker News as a community showcase post, receiving modest early engagement. The app is accessible via kidscreen.app, suggesting it is in an early or independent development stage.

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ProgrammingHacker News ·

Fifth Heat Dome of 2026 to Push Temperatures Above 40°C Across Europe

A fifth heat dome event is forecast to expand across Western and Central Europe in mid-August 2026, with temperatures expected to exceed 40°C in affected regions. The extreme heat event has been flagged by severe weather forecasters tracking the developing system. This marks a notable pattern of repeated heat dome occurrences over Europe within a single year. The forecast has drawn attention online, generating discussion about the frequency and intensity of such extreme heat episodes. Meteorologists are monitoring the situation as the event is expected to impact large portions of the continent.

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ProgrammingDEV Community ·

Developer Builds Local RAG Pipeline Using LangChain, ChromaDB, and LM Studio

A developer has published a hands-on technical guide demonstrating how to build a Retrieval-Augmented Generation (RAG) system entirely from scratch without relying on OpenAI or any cloud services. The pipeline uses Python, LangChain, ChromaDB, and a locally hosted Qwen 9B language model running via LM Studio. The system is designed to solve a practical business problem where employees can query large volumes of HR documentation and receive accurate, document-grounded answers in seconds. The pipeline consists of four core components: a document processor that splits text into chunks, a custom embedding service, a ChromaDB vector store for semantic retrieval, and a local LLM for response generation. The guide highlights key engineering trade-offs, such as the tight coupling between chunk size and embedding quality, and the need to use a consistent embedding model across both indexing and querying stages.

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ProgrammingDEV Community ·

Why Hybrid Search and Reranking Outperform Vector Search Alone in RAG Systems

A technical deep-dive published on DEV Community examines why vector search alone is often insufficient for production-grade Retrieval-Augmented Generation (RAG) systems. The article, third in a series on building reliable RAG pipelines, explains how embeddings translate text into geometric coordinates where semantically similar content clusters together. It argues that even high-quality embedding models fail when fed poorly structured or mixed-content chunks, turning bad input into confidently wrong retrieval results. The piece advocates combining semantic and lexical search methods — known as hybrid search — alongside reranking techniques to narrow large candidate sets down to the most relevant documents. Additional strategies covered include query optimization, metadata filtering, and context compression for more dependable real-world retrieval performance.

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ProgrammingDEV Community ·

Good Code Comments Should Explain Why, Not Just What the Code Does

A technical article published on DEV Community argues that code comments are most valuable when they explain the reasoning behind a decision, not merely restate what the code does. Repeating the logic already visible in the code adds noise and can become misleading if the implementation changes. The piece emphasizes that hidden constraints — such as external system behavior, compatibility requirements, or performance limits — are exactly what comments should document. Without such context, future engineers risk breaking functionality through changes that appear harmless on the surface. The article advises keeping reason-based comments concise, accurate, and updated whenever the underlying constraint changes.

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ProgrammingDEV Community ·

Why 'Verified' in a Schema-Change Report Does Not Mean Safe to Release

Data investigation reports often conflate observed changes with release decisions, creating a dangerous gap in schema-change workflows. A report confirming that one field was added between two Delta table versions does not verify the field's name, type, or compliance with release rules. Experts recommend that reports explicitly separate state identity, evidence coverage, and release intent into distinct, labeled checks. Incomplete findings should be recorded as such rather than omitted, so reviewers know exactly what was and was not examined. Whether reviewed by a human or an AI agent, a report must answer which states were compared, what was actually read, and what evidence remains missing before any release decision is made.

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ProgrammingDEV Community ·

AI model benchmarks ignore cost — here's the math that actually matters

Popular AI model benchmarks typically rank outputs by quality and token usage, but almost never show what developers are actually charged. The true cost depends on a simple formula multiplying input and output tokens separately against a vendor's listed prices, and those two rates can differ by three to ten times. Using a sample coding task of 40,000 input and 12,000 output tokens, costs across leading models in mid-2026 range from roughly $0.056 to $0.50 per run — a ninefold spread no leaderboard displays. Choosing a cheaper model can backfire if it requires more retries and burns proportionally more tokens, potentially making it costlier than a pricier, more capable alternative. The author recommends logging input and output tokens separately per task, benchmarking top candidates on your own workloads, and recalculating costs quarterly as model prices shift frequently.

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ProgrammingDEV Community ·

One developer built 2,768 CSS demos solo — here's how he prevented style collisions

A developer behind codefronts.com hand-wrote 2,768 CSS demos across 138 collections, all of which must coexist on shared gallery pages without breaking each other's styles. The core problem is that CSS silently resolves duplicate selectors by source order, meaning two demos sharing a class name like .card or .btn can invisibly overwrite each other with no console warning. Framework solutions such as CSS Modules and Shadow DOM were ruled out because they produce hashed or unfamiliar class names that make copy-pasted code harder for end users to read and adapt. The developer instead settled on a manual, mechanical naming convention applied at authoring time, designed to keep output legible to anyone pasting a snippet into an unfamiliar project. The system prioritizes human-readable code over build-tool automation, reflecting the unusual constraint that a copy-paste demo library must remain transparent to users who never see the underlying build process.

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ProgrammingDEV Community ·

How Azure Data Factory Pipelines Move Data From Source Systems to Production

Azure Data Factory (ADF) is a cloud-based data integration service that orchestrates the movement and transformation of data across enterprise systems. A typical ADF workflow begins with a trigger that determines when a pipeline should run, followed by activities such as data extraction, loading to staging tables, and validation. ADF connects to source systems — including Oracle, MySQL, REST APIs, and cloud storage — through Integration Runtimes, with Self-hosted Integration Runtimes enabling access to data inside private networks. Pipelines can be scheduled, manually triggered, or event-driven, and often work alongside tools like Apache Airflow and dbt to complete end-to-end data transformations. Understanding each component's role — triggers, linked services, integration runtimes, and activities — is key to building and troubleshooting reliable data pipelines in ADF.

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ProgrammingDEV Community ·

AIUC-1 Standard Offers AI Agent Safety Framework Before Products Ship

The Artificial Intelligence Underwriting Company has published AIUC-1, a standard for AI agents covering six operational domains: data and privacy, security, safety, reliability, accountability, and societal risk. Contributors to the standard include Stanford, MIT, MITRE, the Cloud Security Alliance, and Google Cloud. The framework is designed to help SaaS teams assess whether their agent designs are sound before deployment, addressing gaps around logging, authorisation, and incident response that internal responsible-AI guidelines often overlook. Unlike existing compliance frameworks such as SOC 2 or GDPR, AIUC-1 is specifically shaped around agents that can take actions on behalf of users, call external systems, and retain context across sessions. For engineering and product teams building on protocols like MCP or OAuth-connected assistants, AIUC-1 serves as a pre-deployment checklist rather than a formal certification requirement.

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ProgrammingDEV Community ·

Disabling a workflow quietly broke publishing for a month — here is what that reveals

A developer disabled a GitHub Actions workflow that was corrupting static HTML files on their site, believing the fix was straightforward and temporary. A month later, when they tried to publish an article, they discovered the workflow was actually the only mechanism for converting JSON source files into live web pages. The only record of why the automation had been switched off was a single commit message referencing a prior content-poisoning incident — the full reasoning existed only in memory. The incident highlights a broader systems risk: disabling a component does not remove it from the architecture, it simply causes it to return nothing silently, with no downstream error signal. The author concludes that any disabled component should have a named owner and an explicit re-entry condition, not just an off state with no resolution criteria attached.

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ProgrammingDEV Community ·

ATLOCK Uses Windows NTFS ACLs for File Protection Instead of Encryption

A developer building ATLOCK, a Windows security tool, chose NTFS Access Control Lists over encryption to protect files, arguing that access control and encryption solve fundamentally different problems. File Guard leverages Windows' native permission system to restrict which identities can interact with protected files, keeping them unchanged on disk. The Password Vault, however, uses Fernet encryption with AES-128-CBC and HMAC-SHA256, with keys derived via PBKDF2-HMAC-SHA256, since confidentiality of stored credentials demands a different approach. ATLOCK also includes an Intruder Ops module that captures webcam images on unauthorized access attempts, designed as an asynchronous workflow to avoid freezing the UI during camera initialization. The developer describes the project as a security engineering experiment focused on matching the right protection mechanism to each specific threat.

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ProgrammingDEV Community ·

Google Sheets Can Now Bulk-Geolocate IP Addresses Using a Free Apps Script Tool

A developer guide published on DEV Community explains how to turn Google Sheets into a bulk IP geolocation tool using a free Apps Script integration from IPGeolocation.io. Users paste a ready-made script into the Apps Script editor, store a free API key once, and gain access to custom formulas without writing any code. The formula IPGEO handles individual IP lookups, while IPGEO_BULK can process up to 500 addresses in a single call, returning data such as country, city, timezone, ASN, VPN status, and threat scores. The setup process takes approximately 10 minutes and requires no third-party add-ons. The full source code and formula reference are available on GitHub, making the tool accessible for use cases like fraud review, login monitoring, and ad-click analysis.

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