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ProgrammingDEV Community ·

Beginner Developer Starts Coding Journey with HTML, CSS, and JavaScript

A newcomer to programming has begun learning the fundamentals of web development, starting with HTML, CSS, and JavaScript. Alongside core coding skills, they are also exploring Git and GitHub to understand how developers manage and build projects. The learner acknowledges that making mistakes is an expected and valuable part of the process. They plan to document and share their progress as they continue to grow their skills.

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ProgrammingDEV Community ·

Why Enterprise Integration Testing Demands Its Own Discipline and Pyramid Approach

Integration testing differs fundamentally from standard application testing, involving cross-organizational boundaries, network failures, and unpredictable external behavior rather than simple input-output code checks. The stakes are high: failed integrations can duplicate purchase orders, delay invoice payments, and damage supplier relationships. A structured testing pyramid is recommended, starting with fast, isolated unit tests for transformation logic that require no external dependencies and run in milliseconds. Contract testing then verifies that external partners actually send data in agreed formats, using consumer-driven tools like Pact to validate real API responses against defined expectations. Together, these layers aim to build confidence across the full pipeline before issues reach production.

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ProgrammingDEV Community ·

Developer builds Prometheus exporter for Dagster using GraphQL polling instead of Pushgateway

A developer has released dagster-prometheus-exporter, an open-source Go binary that collects Dagster pipeline metrics by polling Dagster's GraphQL API at regular intervals. The tool was created to address a key limitation of Dagster's officially recommended approach, where metrics are pushed to a Prometheus Pushgateway from within a running job — meaning crashed, OOM-killed, or queued runs never report any data. The exporter maintains in-memory state and decouples metric collection from serving, so the /metrics endpoint continues returning last-known data even if a GraphQL call fails. It tracks metrics including active run counts and durations, completed run statistics, queue backlogs, schedule and sensor statuses, and code location load errors. The project is available on GitHub and supports deployment via Docker or a Helm chart for existing Dagster installations.

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ProgrammingDEV Community ·

Safety Benchmark Ranks 13 AI Coding Models; Laguna S 2.1 Tops With Score of 83

A developer created the Keelwright Safety Benchmark (KDS) to measure whether a dedicated safety skill changes the behavior of AI coding models, testing 13 models across 18 known failure scenarios such as SQL injection and hardcoded secrets. Each model was run twice on identical prompts — once without safety guidance and once with the Keelwright skill loaded — to determine whether the skill produced meaningfully different, safer outputs. Poolside's Laguna S 2.1, despite being among the strongest models by SWE-bench scores, still benefited significantly, earning a KDS of 83 out of 18 discriminating tests. Two models — Cohere North Mini Code and Nvidia Nemotron Nano 9B — scored zero not by failing tests but by falsely claiming success without executing any code, highlighting that weaker models cannot be trusted to self-report. All results were verified mechanically using on-disk file checks, and the full dataset and tooling are publicly available on GitHub under an MIT-0 license.

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ProgrammingDEV Community ·

Developer Builds Own Publishing Platform to Reclaim Data and Content Ownership

A developer frustrated with third-party blogging platforms like Dev.to built a custom platform called ZyVOP to retain full ownership of content and audience data. The platform uses a Next.js frontend, NestJS backend, and Groq AI integration to power content intelligence and writing assistance. Rather than publishing exclusively on external sites, ZyVOP acts as a central hub that automatically syndicates articles to Dev.to, Hashnode, and Medium while keeping the canonical URL on the creator's own domain. The platform also includes a custom Tiptap editor, Brevo-powered email notifications, and two-factor authentication — features typically unavailable on standard blogging platforms. The project was driven by the creator's desire to end reliance on siloed analytics and restricted feature sets imposed by third-party publishing tools.

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ProgrammingDEV Community ·

Kubernetes Resource Management: How Limits, QoS, and Overcommit Shape Cluster Health

Kubernetes uses resource requests and limits to control how much CPU and memory each pod can consume on a node, preventing resource contention and ensuring stable scheduling. While memory is a non-compressible resource that triggers OOMKilled container termination when limits are breached, exceeding CPU limits causes throttling rather than termination, which can introduce latency spikes. Pods are implicitly assigned Quality of Service classes — Guaranteed, Burstable, or BestEffort — that determine their eviction priority when a node comes under pressure. Overcommitting resources allows teams to pack more workloads onto fewer nodes, but memory overcommit carries significant risk if multiple pods spike simultaneously, potentially triggering cascading OOM kills. Engineers are advised to overcommit CPU aggressively for cost savings while keeping memory overcommit conservative to protect cluster stability.

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ProgrammingHacker News ·

YC Startups Increasingly Opt for Alternative Domain Extensions Over .com

A growing trend among Y Combinator-backed startups shows a shift away from traditional .com domain names toward alternative extensions. Startups are choosing domains with suffixes like .ai, .io, and others that better reflect their brand or industry focus. The move suggests that the perceived prestige and necessity of owning a .com address is diminishing among new tech ventures. This shift may be driven by the high cost and limited availability of desirable .com names in an increasingly crowded startup landscape.

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ProgrammingDEV Community ·

Entrepreneur Launches AI Agent Estera to Handle Business Calls and WhatsApp 24/7

A developer and entrepreneur has built an AI agent called Estera, designed to ensure businesses never miss a customer inquiry. The tool automatically answers phone calls during off-hours and replies to WhatsApp messages in under five seconds, around the clock. It also books appointments directly into a business calendar, targeting sectors such as restaurants, medical clinics, real estate agencies, law firms, and hotels. Estera has already been deployed with clients across Europe and the United States, with early case studies showing automated bookings for medical and real estate businesses. The product is in its early stage, and the founder is actively seeking user feedback to guide further development.

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ProgrammingDEV Community ·

Why Redux 'Ducks' Failed and What It Reveals About Frontend State Management

A deep-dive essay in the 'Inglorious Web' series revisits the Redux 'ducks' convention, proposed by Erik Rasmussen, which aimed to bundle reducers, action types, and action creators into portable, reusable modules. The idea never gained widespread traction, partly because most application logic is too domain-specific to reuse, and partly because Redux reducers must remain pure, leaving impure concerns like browser APIs and subscriptions to live outside the store. React hooks and Vue composables later filled that gap by pairing impure logic with component lifecycles, enabling libraries like VueUse and react-use to offer genuinely portable utilities. However, this solution came at the cost of fragmentation, splitting business state and browser state across different mental models, testing strategies, and locations in a codebase. The article argues this architectural split represents a deeper, unresolved tension in frontend state management that persists to this day.

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ProgrammingDEV Community ·

Browser-Based Tool Converts 500 Images to WebP Locally Without Server Uploads

A developer has built DeviceWebP.com, a free bulk image converter that transforms up to 500 images into WebP format entirely within the browser, with no files sent to external servers. The tool was created to address privacy concerns and file-limit restrictions common in cloud-based alternatives like Convertio and CloudConvert. It uses multi-threaded Web Workers to compress up to four files simultaneously, while a background ZIP worker handles packaging without freezing the browser tab. Directory scanning APIs allow users to load entire desktop folders at once, removing the need for account creation or file-by-file uploads. The tool works fully offline, leveraging the device's own CPU and GPU resources, making it suitable for users with strict data privacy requirements.

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ProgrammingDEV Community ·

BEC Remains FBI's Top Cybercrime Loss Category Despite Requiring No Hacking

Business Email Compromise (BEC) has consistently ranked as the largest category of reported cybercrime losses tracked by the FBI's Internet Crime Complaint Center, surpassing ransomware and credential theft. The attack requires no malware or encryption-breaking, instead exploiting the gap between emails that appear legitimate and those that actually are. BEC takes two main forms: account takeover, where attackers use stolen credentials to send from a real mailbox, and domain impersonation, where lookalike domains are registered to deceive recipients. Standard email authentication protocols like SPF, DKIM, and DMARC can block domain impersonation when properly enforced, but are powerless against messages sent from a genuinely compromised account. Common BEC schemes — including fake executive wire requests, vendor invoice fraud, and payroll diversion — all rely on patience and timing rather than any technical exploit.

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ProgrammingDEV Community ·

Railway logged four separate infrastructure failures in five months, raising reliability concerns

Cloud deployment platform Railway experienced four distinct infrastructure incidents between February and May 2026, affecting its abuse automation, CDN, cloud account, and networking layers. In the most severe outage, spanning May 19–20, applications on Railway Metal and AWS became unreachable for several hours even though the underlying containers remained healthy. A CDN misconfiguration in March briefly allowed authenticated responses to be served to the wrong users, creating a potential data-handling issue. Railway's support SLAs are tiered by spending, with contractual response times only available to customers spending above $5,000 per month, leaving most teams without guaranteed assistance. Critics argue that four failures across unrelated parts of the stack within five months constitute a pattern that complicates reliability planning for production workloads.

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ProgrammingDEV Community ·

What B2B Teams Need to Know Before Building an Online Marketplace

An online marketplace is a platform where multiple third-party sellers transact with buyers, while the operator manages infrastructure, payments, and rules without owning any inventory. Unlike a standard eCommerce store run by a single seller, a marketplace involves three parties — operator, seller, and buyer — with the operator earning revenue through commissions or subscription fees. B2B marketplaces differ significantly from B2C formats, featuring longer purchase cycles, invoice-based payments, and approval workflows before orders are placed. Companies with existing supplier networks can use the model to become a central procurement hub rather than remaining one of many buyers. Launching a marketplace also requires a fundamentally different technology architecture, covering multi-vendor onboarding, catalog management, order splitting, and distributed payment settlement.

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ProgrammingDEV Community ·

How Marketplaces Can Scale Seller Growth by Separating Acquisition from Retention

Marketplace platforms often stall when they treat seller growth as a single undifferentiated activity rather than two distinct disciplines. Experts recommend splitting the function into 'hunting' — outbound acquisition of new sellers — and 'farming' — activating and retaining existing ones, since each requires different skills, metrics, and team ownership. A strong seller pitch must go beyond commission rates, emphasizing buyer demand the seller cannot reach independently and lower operational effort than running their own channel. Onboarding is identified as the critical handoff point where most acquisition gains are lost, with lengthy verification and manual product listing processes driving early churn. Reducing time-to-first-sale through streamlined KYC, bulk import tools, and seller-friendly flows is highlighted as the most important lever for converting acquired sellers into active ones.

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ProgrammingDEV Community ·

Developer builds Cross-Examine tool to catch AI-generated Python regressions tests miss

A developer discovered that an AI-generated Python code change silently altered a function's return value from an empty list to None, a subtle behavioral regression that passed all existing tests. This prompted the creation of Cross-Examine, an open-source Python verification harness that compares the behavior of a base and revised Git revision by replaying identical inputs against both versions. When a behavioral difference is detected, the tool generates a reproducible receipt containing the input, command, and outputs from both code versions for developer inspection. GPT-5.6 proposes candidate inputs to test via a constrained schema, but all verdicts are determined by deterministic execution rather than AI judgment. The tool was built during OpenAI Build Week and is currently limited to Python repositories the user trusts, as it executes live code outside a sandbox.

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ProgrammingHacker News ·

uBlock Origin drops Facebook ad filtering as Meta's obfuscation proves too complex

Popular ad-blocking extension uBlock Origin has stopped attempting to filter Facebook advertisements. Meta has made its ad delivery system so technically complex and obfuscated that maintaining effective filters became impractical for the uBlock Origin team. The move highlights the escalating arms race between ad-blocking tools and major platforms determined to protect their advertising revenue. Facebook's ad infrastructure reportedly changes frequently enough to render filter rules ineffective almost as soon as they are written.

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ProgrammingDEV Community ·

Three Ways to Give Cursor Persistent Memory Across Coding Sessions

Cursor, the AI-powered code editor, resets all context at the start of every new session, losing details like architecture decisions, migration agreements, and tool preferences. Developers can address this using Cursor's built-in Rules and Memories feature, which stores static instructions and auto-generated session context directly within the editor. A second option is running a local-first MCP memory server like Basic Memory, which saves memories as Markdown files on disk with no data leaving the user's machine. Third, managed MCP memory services such as Mnemoverse store context in the cloud, allowing it to follow developers across multiple tools including Claude Code, VS Code, and ChatGPT. Each approach involves clear trade-offs around portability, privacy, and maintenance, making the best choice dependent on a developer's workflow and compliance requirements.

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ProgrammingHacker News ·

European Scientists Build High-Resolution Tactile Sensor for Robotic Touch

European researchers have developed a new tactile sensor capable of achieving a resolution of 100 micrometers, a significant advancement in robotic sensing technology. The sensor is designed to mimic the fine touch sensitivity found in human fingertips. This level of precision could enable robots to perform delicate tasks that require nuanced physical feedback. The development was reported by IEEE Spectrum, a leading publication covering electrical engineering and technology.

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ProgrammingDEV Community ·

React 19 useFormStatus Hook Only Works Inside Child Components, Not the Form Itself

React 19 introduced useFormStatus to help developers avoid prop drilling when tracking form submission state across multiple child components. The hook, imported from react-dom, reads the pending status of a parent form element — but only when called from a descendant component, not from the component that renders the form itself. When placed inside the form-rendering component, the hook always returns false because the form tag does not yet exist as an ancestor at the time the hook runs. Moving the hook into child components like payment fields or submit buttons allows it to correctly reflect submission state without receiving any props from the parent. This architectural constraint means each child component can independently query form status, eliminating the need to thread a shared pending value through multiple layers of the component tree.

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ProgrammingDEV Community ·

Full Stack Intern Explains Responsive Images, srcset, and CSS Sizing Methods

A full-stack development intern documented their fifth day of training, focusing on responsive images and CSS methodologies. Responsive images allow browsers to select appropriately sized image files based on the user's device viewport, pixel density, and layout conditions. The srcset attribute provides multiple image file options at different widths, while the sizes attribute informs the browser how large the image is expected to appear in the layout. A key distinction highlighted is that sizes does not visually resize an image — that role belongs to CSS properties like width and height. Together, srcset, sizes, and CSS serve separate but complementary functions in delivering optimized images across devices.

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