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ProgrammingDEV Community ·

Developer Recreates Vietnam's Bánh Mì Sandwich as Pure CSS Artwork

A developer submitted a CSS art piece to the Frontend Challenge - Comfort Food Edition, depicting a bánh mì sandwich overlaid on a silhouette map of Vietnam. The artwork uses no JavaScript, SVG, image assets, or external fonts — every visual element is built solely with HTML and CSS browser primitives. Design details include a Đông Sơn bronze drum as a background element, blinking map markers for Hà Nội and Hồ Chí Minh, and a vintage Vietnamese street-poster aesthetic with parchment tones and aged typography. The central concept, 'A journey in every bite,' frames the sandwich as both a cultural symbol and a geographic narrative across Vietnam. The finished piece is viewable as a live demo on CodePen.

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ProgrammingDEV Community ·

CSS Box Model, Cascade, and Specificity Explained for Web Developers

Every HTML element is rendered as a rectangular box consisting of four layers: content, padding, border, and margin. The box-sizing property determines whether declared widths apply only to content (content-box) or include padding and border (border-box), with border-box being the preferred choice among most developers. When multiple CSS rules target the same element, the browser resolves conflicts through the cascade, which weighs origin, specificity, and source order. Specificity is a scoring system where inline styles outrank ID selectors, which outrank class selectors, which in turn outrank element selectors. While !important can override the cascade, overusing it makes stylesheets harder to maintain and debug.

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ProgrammingDEV Community ·

Why ML Models Fail at Stock Price Prediction and What Works Instead

Machine learning models are widely hyped for stock market prediction, but experts warn that markets are too noisy and adaptive to forecast reliably with standard approaches. A practical analysis shows that LSTM models trained to predict exact future prices tend to overfit historical data and perform poorly on unseen market conditions. The key insight is that ML works better when reframed around predicting the direction of price movement or volatility rather than precise price targets. Gradient-boosted classifiers using engineered features like returns, volume, and technical indicators offer a more robust and probabilistic edge. The practical value of ML in finance lies in informing risk management and position sizing, not in generating guaranteed profit signals.

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ProgrammingDEV Community ·

Silent bug in one unprotected line caused profitable Apify actor to fail repeatedly

A developer discovered that their most profitable Apify actor — which monitors CBOE options data for unusual trading volumes — had been silently failing on a significant share of client-triggered runs. The root cause was a single unprotected line at the very end of the script: a data-push call with no error handling, meaning one malformed row could cause the entire run to fail silently. The problem went undetected for some time because Apify does not expose client run logs to actor owners, leaving only an abnormal success-rate metric as a clue. The fix involved wrapping the batch push in a fallback that retries row by row on failure, dropping only bad rows rather than discarding the full result set. A last-resort email alert was also added to notify the developer immediately if any future end-to-end run failure occurs.

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ProgrammingDEV Community ·

Developer Builds Local Persistent Memory Layer for Claude Code AI Agent

A developer frustrated by Claude Code's lack of session continuity has built OmniMemory, an open-source local memory layer for coding agents. The tool stores architectural decisions, project context, workflows, and known pitfalls gathered across previous sessions, so agents can resume work with accumulated knowledge rather than starting from scratch. OmniMemory integrates with Git, associating memories with specific branches and history to prevent context from one branch polluting global knowledge. It also addresses memory staleness by cross-checking stored context against codebase changes using tree-sitter for symbol-level analysis. The system runs entirely locally on SQLite, uses BM25F-based ranking for relevant memory retrieval, and connects to Claude Code via hooks with a local UI for inspecting stored context.

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ProgrammingDEV Community ·

A Practical Roadmap to Becoming a .NET Developer in 2026

A structured guide outlines how aspiring .NET developers can build production-ready skills in 2026 by learning in layers rather than tackling everything at once. The recommended path starts with C# fundamentals before progressing through ASP.NET Core, SQL, Entity Framework Core, REST APIs, authentication, testing, Docker, and cloud deployment. Beginners are advised to focus on .NET 10, the latest Long-Term Support release backed by Microsoft through November 2028, and to avoid outdated .NET Framework tutorials. Setting up core tools — including the .NET 10 SDK, an IDE, Git, Docker Desktop, and a database — and running a basic app early is emphasized over passive learning. The roadmap stresses that understanding C# deeply before moving to frameworks is key to being able to debug and reason through real-world problems, not just copy code.

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ProgrammingDEV Community ·

Evolution API: A Developer Guide to Programmatic WhatsApp Integration

Evolution API is an open-source tool that exposes WhatsApp communication as RESTful HTTP endpoints, allowing developers to send messages, manage contacts, and automate responses from their own servers. The API supports rich messaging formats including text, media, and buttons, and is designed to work alongside WhatsApp session management or Business Cloud API methods. Recommended deployment uses Docker on a Linux VPS with at least 4 CPU cores and 8GB RAM for production environments, as shared hosting has been shown to cause frequent authentication failures. Setup begins with scanning a QR code to link a phone number to the API instance, after which the system can begin processing requests through defined HTTP endpoints. The API is primarily used as a backend layer for CRM systems, chatbots, and automated customer service workflows.

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ProgrammingDEV Community ·

Developer Builds Decoupled WordPress-Next.js Platform Tailored for Modern Newsrooms

A developer has unveiled a custom news publishing architecture that combines WordPress with SQLite and a decoupled Next.js frontend to remove traditional backend constraints. The platform includes automated HLS video conversion, AI-generated captions, voice transcriptions, and cryptographic digital watermarking for media management. On the infrastructure side, it supports unlimited horizontal scaling, edge network hardening via machine learning, and a usage-based pricing model. The build also automates distribution across Apple News, Google News, YouTube, and native iOS and Android apps. Additional features include built-in A/B testing, newsletter management, ClickHouse analytics integration, and tools for independent programmatic advertising.

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ProgrammingHacker News ·

TinySol: A Minimalist Solitaire Card Game Built for DOS

A developer has released TinySol, a compact solitaire game designed to run on the DOS operating system. The project is hosted on the ClassicBits website under a personal software portfolio. The game appears to target retro computing enthusiasts who still use or emulate DOS environments. Details about gameplay mechanics and system requirements are available on the developer's project page. The release received modest attention on Hacker News, garnering a small number of points and no comments at the time of posting.

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ProgrammingDEV Community ·

Mautic 5 users can swap SMTP for Symfony Mailer DSN to improve email deliverability

Mautic 5, the open-source marketing automation platform, has moved from SwiftMailer to Symfony Mailer, enabling users to configure email delivery via a DSN string instead of traditional SMTP. MailKite, an email delivery service, offers a first-party Symfony Mailer transport that provides clearer error messages compared to generic SMTP responses. Users can install the transport via Composer, set an API key in the MAILER_DSN environment variable, and clear Mautic's cache to activate the new configuration. For managed Mautic hosts without Composer access, a standard SMTP fallback using MailKite credentials on port 587 with TLS is also supported. Successful delivery requires that all campaign sender addresses belong to domains with SPF and DKIM records properly configured.

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ProgrammingDEV Community ·

Why Automating a Legacy Windows Desktop App Required a Real Interactive Session

A development team attempting to automate a Windows-only, GUI-first desktop application initially tried running it inside a Windows compatibility layer within a Linux container to stay aligned with their cloud-native stack. The approach produced intermittent, hard-to-diagnose failures — the automation SDK would randomly fail to connect to the running application, with no consistent trigger or clear root cause. After months of patching symptoms, the team abandoned the compatibility layer and moved the application to a native Windows machine, which resolved most issues. However, a second requirement then emerged: the application's automation layer only worked reliably inside a real, interactive, logged-in desktop session — not a headless or background service context, even on genuine Windows. This reflects a broader class of legacy software — including engineering tools, financial systems, and CAD applications — built with the assumption that a human is actively logged in, making headless server automation fundamentally incompatible by design.

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ProgrammingDEV Community ·

How to Stop AI Tools From Generating Generic Web Designs

Developer Maneshwar, creator of the open-source AI code reviewer git-lrc, argues that AI-generated web designs tend to look identical because models are trained on the statistical average of the public internet, producing what he calls 'AI slop.' He contends the root problem is not model quality but a lack of deliberate design taste on the part of the user. His proposed fix begins with actively collecting design inspiration from platforms like Dribbble, Pinterest, and X, rather than relying on vague prompts like 'build me a modern landing page.' He recommends organising those references into a personal inspiration library — even using Claude Code to build one — so that prompts are grounded in specific, curated aesthetics rather than generic defaults. The broader argument is that better outputs require users to develop and supply their own taste, since improvements in model capability alone will simply raise the baseline of what qualifies as generic.

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ProgrammingDEV Community ·

Engineer Builds Full AWS Network in 90 Lines of Terraform Code

A developer has shared how a small Terraform project can provision an entire AWS network — including a VPC, two subnets, an internet gateway, a security group, and an EC2 instance — using just two commands. The setup replaces a tedious manual process of clicking through roughly fifteen AWS console screens, which often led to misconfigured route tables and connectivity failures. The project is organized across five files covering provider config, variables, core infrastructure, and outputs, making the setup fully reproducible. One subnet is configured as public with internet access via an internet gateway, while the second remains private and isolated. The author also highlights two specific pitfalls encountered during the build, aiming to help others avoid the same mistakes.

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ProgrammingDEV Community ·

Omnismith Adds Slug Support Across Templates and Entities to Simplify API Pipelines

Omnismith has extended project-scoped slug identifiers across attributes, templates, and entity endpoints, enabling deterministic API workflows without preliminary identifier lookup queries. Previously, automated ingestion pipelines and ETL jobs had to either hardcode UUIDs or make extra HTTP requests to resolve human-readable schema names into internal UUIDv7 identifiers. The new slug support allows developers to reference templates and attributes by plain string identifiers, with the platform resolving these to underlying primary keys during payload validation. Entity read endpoints also support a query parameter to return attribute data keyed by slugs rather than UUIDs. The platform's AI Assistant similarly benefits, as it can now generate structured payloads directly from schema definitions via Model Context Protocol tools without intermediate identity resolution steps.

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ProgrammingDEV Community ·

How a Single Rupee Can Trigger ₹62,400 in Extra Tax Due to a Coding Bug

A software developer building an India tax-regime comparison tool discovered a severe cliff-edge flaw in naive progressive tax implementations. Under India's new tax regime, incomes up to ₹12,00,000 attract zero liability through a rebate, but a poorly coded function drops the rebate entirely at ₹12,00,001, instantly imposing roughly ₹62,400 in tax on just one extra rupee of income. The law addresses this through marginal relief, which caps the tax on income just above the threshold to the amount by which earnings actually exceed it. The developer identified three such discontinuities — rebate cliff, surcharge entry points, and marginal relief calculations — and resolved them using a binary search approach in TypeScript. The article serves as a technical guide for developers building accurate tax calculators, highlighting how statutory order of operations and edge-case testing are critical to correctness.

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ProgrammingDEV Community ·

MOKSHA Devlog: HUD Moved Outside Game Container in Commit 175ee207

Developer Weird Codes pushed commit 175ee207 to the indie game MOKSHA on August 8, 2026, restructuring the UI by moving the Heads-Up Display outside the main game canvas into a dedicated outer wrapper. The change enables the HUD and canvas to scale together uniformly, improving layout consistency across screen sizes including mobile. Three bugs were also resolved: a Prarabdha time-penalty multiplier was corrected, karma tracking during rebirth logic was fixed, and alert card stacking was updated to count only visible rendered cards. Supporting changes across seven files included canvas clipping, CSS layout updates, smoother tunnel gradients, and new localization strings for inauspicious karma events in both Hindi and English.

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ProgrammingDEV Community ·

Developer Builds CSS Art of Childhood Clay Stove to Capture Comfort Food Memory

A frontend developer created an interactive CSS art piece for DEV Community's Frontend Challenge: Comfort Food Edition, depicting a traditional clay chulha with firewood, flames, and a cooking phulka. The project was inspired by childhood memories of winter evenings in a family kitchen, where the developer's mother made simple phulkas on a clay stove. Rather than recreating a recipe, the developer aimed to capture the warmth and togetherness of those shared meals. The interactive piece, built and hosted on CodePen, allows users to tap the phulka to trigger a brief animation accompanied by the line: 'I never missed the recipe. I missed the winter kitchen.' The developer paid close attention to authentic visual details, including the chulha's tapered clay body, asymmetric firewood placement, and fire-lit shading on the phulka from below.

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ProgrammingDEV Community ·

Why Unknown Processes Keep Reappearing in Windows Task Manager After Reboot

Windows users often notice unfamiliar processes in Task Manager that return after every restart, which can raise concerns about malware or unauthorized software. However, such processes are frequently launched automatically by legitimate applications, drivers, software updaters, or Windows itself through startup mechanisms like services, scheduled tasks, or registry entries. Investigating a recurring process involves checking its executable file path, digital signature, and publisher, rather than relying on the process name alone. Tools like Task Manager, PowerShell, and third-party monitors can help users identify what is triggering a process at boot. Security experts recommend combining multiple signals — location, signature, behavior, and origin — before drawing conclusions about whether a process is harmful.

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ProgrammingDEV Community ·

Scalable Hiring Systems Depend on Structured Evidence, Not Memory or Static Profiles

Workforce systems often fail silently as companies grow, with critical hiring information scattered across Slack, email, and spreadsheets that barely hold together at scale. The core problem is unclear process state — when a system cannot answer who is waiting, who owns the next step, and what decisions were made, teams fall back on memory rather than reliable process. Truly scalable hiring infrastructure requires event-based candidate tracking, where every status change is recorded as a distinct action rather than a manually updated dropdown. Role-specific evidence also matters: a smart contract engineer and a frontend engineer may follow similar hiring steps, but the meaningful signals differ significantly between them. Building around structured evidence — what candidates actually did, changed, and explained — makes judgment easier to apply consistently without replacing it.

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