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ProgrammingDEV Community ·

How a Domain-Lock Guard Prevents Rental Automation from Straying to Third-Party Sites

A rental app that automates form-filling for listing inquiries uses a domain-lock guard to prevent its automation from following redirects to unrelated third-party websites. Without such a guard, the automation could silently create accounts or submit data on sites the user never intended to visit. The guard computes the registrable domain (eTLD+1) using a public suffix list, treating ambiguous cases as mismatches to err on the side of caution. Crucially, the check is applied at the recording stage as well, so any steps taken on a foreign domain are discarded and never saved to the replay recipe. The design principle behind this approach is to guard data at the point it enters the system, not only at the point it is later used.

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ProgrammingHacker News ·

Solar Power Costs Keep Falling, Making It Increasingly Affordable

Solar power is becoming dramatically cheaper, with costs dropping to levels once considered unimaginable by industry analysts. The trend is being driven by advances in manufacturing, economies of scale, and growing global investment in renewable energy infrastructure. This price decline is making solar an increasingly competitive option compared to fossil fuels in many markets. The shift is seen as a significant development in the broader transition toward cleaner energy sources worldwide.

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ProgrammingDEV Community ·

Developer Reflects on the Hidden Obsession Behind a Career in Tech

A software developer shares a candid account of what working in tech actually looks like day-to-day, far removed from the hacking stereotypes portrayed in movies. Most of the job involves long hours staring at a screen, debugging code — sometimes for days — before a breakthrough finally arrives. While the satisfaction of solving complex problems is deeply rewarding, the developer admits the work rarely stays at the office, with coding problems often intruding on family dinners and weekends. This constant mental engagement has made it difficult to truly disconnect, highlighting a common struggle among tech professionals around work-life balance. The developer is now actively exploring boundaries — such as screen-free days — and is seeking advice from others on how to stay present outside of work.

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ProgrammingDEV Community ·

4 Pre-Submission Fixes Every First-Time WordPress.org Plugin Developer Should Know

A developer submitting a WooCommerce plugin to the WordPress.org directory for the first time documented four critical issues that had to be resolved before the review process even began. The plugin's name had to be restructured to avoid trademark conflicts and generic labeling, which triggered a cascade of changes across file names, text domains, and documentation. All premium features needed to be fully removed from the free build's codebase rather than simply hidden or disabled, as gating code violates directory guidelines. Build-time code transformations caused Plugin Check errors that were absent in the source, requiring the developer to always test the final generated zip rather than the original files. The author noted that version bumps and other housekeeping overhead are inevitable even before any users exist, and plans to share a follow-up once the formal review concludes.

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ProgrammingDEV Community ·

Looking to Connect with Developers and Open-Source Communities

Hi everyone! 👋 I'm excited to join this developer community and connect with people building interesting projects. I'm particularly interested in open source, developer tools, self-hosted software, DevOps, technical documentation, and GitHub projects. I'm currently exploring ways to help useful projects reach the right developers and communities through genuine discussions, feedback, testing, and collaboration. I'd love to connect with developers who are: Building open-source projects Feel free to share what you're currently building!

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ProgrammingDEV Community ·

How to Security-Test a LangChain Agent Using a 15-Line FastAPI Wrapper

Developers often ship AI agents to production after a successful demo without conducting adversarial security testing, leaving a critical gap between functional validation and real-world safety. Functional tests only verify expected inputs and miss scenarios like prompt injection, scope violations, tool misuse, and goal hijacking — threats categorized in the OWASP Top 10 for Agentic Applications. The article demonstrates how a tool called Humanbound red-teams a live agent using OWASP-aligned attack scenarios, grading transcripts into a security posture score. Because Humanbound operates as a black-box HTTP tester, agents built with frameworks like LangChain must first be wrapped in a lightweight HTTP service, such as a FastAPI endpoint, to be compatible. The post walks through a sample LangChain support agent with order lookup and refund tools, then shows how a minimal server wrapper bridges the gap between a local .invoke() agent and the security testing interface.

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ProgrammingDEV Community ·

Developer builds tool that auto-generates architecture explainers from AI-written code

A developer has released 'show-me-the-build', an open-source skill compatible with Claude Code, Cursor, Codex, and other LLM-based agents. The tool analyzes any codebase or cloud deployment and generates a self-contained, interactive HTML presentation explaining what was built, how it works, and why each component exists. Architecture diagrams are rendered step by step, reflecting the actual order in which resources were created, with clickable elements that surface real reasons drawn from the code or infrastructure docs. The tool requires no server or build step and is aimed primarily at hackathon participants who need to quickly explain AI-assisted projects to judges. It can be installed via a single npx command and invoked directly inside a supported coding agent.

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ProgrammingHacker News ·

StemJSON: New JSON-Based Language Lets AI Build and Customize Mobile Apps On-Device

A developer has introduced StemJSON, a domain-specific language built on JSON and designed to work with large language models for native mobile app development. The tool allows AI to generate mobile features, screens, and full applications directly on the user's device without requiring external processing. One of its key propositions is enabling end users to customize app behavior in real time through AI-driven interactions. The project was shared on Hacker News as a community showcase, inviting feedback from developers and technical users. StemJSON is positioned as a way to accelerate mobile development while opening new possibilities for personalized user experiences.

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ProgrammingDEV Community ·

How to Build a Production-Ready Data Science Pipeline That Goes Beyond the Model

A technical guide published on DEV Community outlines the key engineering principles for building reliable, production-grade data science pipelines. The piece emphasizes that a machine learning model is just one component, and the real challenge lies in creating a dependable path from raw data ingestion to feature generation, model deployment, and outcome monitoring. It recommends defining a clear prediction contract before selecting any storage or orchestration tools, and stresses that training and inference pipelines must compute features identically to avoid silent performance degradation. The guide also advocates for strict data versioning and model traceability, linking every trained model to its code, data snapshot, configuration, and approval record. Batch scoring is highlighted as the simpler and often sufficient default for most use cases, with online or streaming inference reserved for time-sensitive decision flows.

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ProgrammingDEV Community ·

How Hash Maps and Sets Can Replace Slow Nested Loops in Coding Interviews

Hash maps (dictionaries in Python) and sets are fundamental data structures that offer average O(1) time for insert, search, and delete operations, making them far more efficient than nested loops. Interviewers frequently test whether candidates can replace O(n²) brute-force approaches with hash map-based solutions that trade a small amount of memory for significantly faster runtime. Classic problems such as Two Sum and Contains Duplicate can be solved in O(n) by storing previously seen values in a dictionary or set instead of comparing every pair. Sets are particularly useful for duplicate removal and existence checks, while dictionaries excel at frequency counting and index tracking. Mastering these structures is considered a foundational step in coding interview preparation, with problems like Two Sum, Valid Anagram, and Top K Frequent Elements among the most commonly tested.

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ProgrammingDEV Community ·

How Flutter Enables Startups to Build and Ship Mobile MVPs Faster and Cheaper

Flutter, Google's cross-platform framework, allows startups to build a single codebase that runs natively on both iOS and Android, reducing engineering costs and time-to-market. Rather than replicating every feature of established competitors, experts recommend focusing on a core user loop covering onboarding, a primary action, feedback, and a retention hook. Clean Architecture using the BLoC pattern is advised to keep business logic separate from UI code, improving testability and rendering performance. For backend integration, tools like Dio for typed API calls and Hive for offline caching are recommended to ensure reliability across varying network conditions. The approach aims to help early-stage teams ship a lean, stable product to the Apple App Store and Google Play Store without overextending resources.

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ProgrammingDEV Community ·

Why Your Project Tracker's 'In Progress' Label Is Hiding a Rework Problem

Most project trackers represent rejected or reworked deliveries as simple state changes rather than distinct events, erasing critical information about what went wrong and why. This means teams lose visibility into whether a task was completed and redone multiple times, inflating cycle-time metrics and masking the true causes of failure. Categorising rework with a short, fixed list of reason codes — such as 'brief was ambiguous' or 'requirements changed' — allows teams to spot patterns and act on aggregate data each month. One team discovered through this method that most of their rework stemmed from specification problems, not poor execution, explaining why their previous corrective efforts had failed. The approach requires no new tooling and becomes especially important as AI agents take on tasks, since they cannot self-report confusion the way human workers can.

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ProgrammingDEV Community ·

Guide to Clean Architecture in Flutter Using BLoC and Repository Pattern

A 2025 developer guide outlines how to structure Flutter applications using Clean Architecture to avoid common pitfalls like mixed business logic and untestable code. The approach divides apps into three distinct layers — Presentation, Domain, and Data — where each layer communicates only downward, never in reverse. The Domain layer holds pure Dart entities and use cases with no Flutter or JSON dependencies, while the Data layer handles API calls, local databases, and data transfer objects. A Repository pattern bridges the Domain contracts with real data sources, including offline caching fallback when no network is available. The BLoC pattern manages state in the Presentation layer, ensuring UI widgets remain decoupled from business logic and enabling easier unit testing.

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ProgrammingDEV Community ·

CPANSec Strengthens Perl Ecosystem Security as HeroDevs Donates $10,000 to TPRF

CPANSec, the security oversight group for Perl and the CPAN ecosystem, works proactively to detect and remediate vulnerabilities in open-source software supply chains while bridging developers and the broader open-source community. The group promotes transparent reporting practices, faster disclosure timelines, and secure coding awareness among contributors. HeroDevs has donated $10,000 to The Perl and Raku Foundation, supporting community infrastructure, security work, and ecosystem maintenance. Perl Weekly Issue 790 also highlights the German Perl Workshop 2026 videos now available on YouTube, along with a recommended practice of including SECURITY.md files in CPAN distributions. The newsletter additionally notes an upcoming online event titled 'Punk: Perl MVC, compiled at boot,' organised by Gabor Szabo.

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ProgrammingDEV Community ·

Key Architecture Patterns to Build High-Performance Flutter Apps at 60fps

Flutter can render UI at 60fps or higher, but poor state management and blocking the main thread often cause dropped frames and sluggish experiences. Using the BLoC pattern with BlocSelector helps isolate widget rebuilds to only the components that need updating, reducing unnecessary rendering. Heavy tasks like JSON parsing or image processing should be offloaded to background threads using Dart's compute() function to keep the UI responsive. Offline-first design, using local databases like Hive paired with optimistic UI updates, ensures apps remain functional without a network connection. Additional best practices include using const constructors, caching network images, and properly disposing controllers to prevent memory leaks.

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ProgrammingDEV Community ·

Amazon SES Overhauls Pricing With Three Tiers From July 2026

Amazon restructured its Simple Email Service (SES) billing on July 21, 2026, introducing three paid tiers — Essentials, Pro, and Enterprise — replacing the previous à la carte pricing model. Existing accounts that sent mail on or after June 1, 2025, remain on legacy pricing unless they manually opt into a new plan, while new and dormant accounts default to Essentials. The Essentials tier has no monthly base fee but offers shared IP infrastructure, whereas Pro costs $105 per month and adds a managed dedicated IP for reputation isolation, and Enterprise runs $500 per month with expanded multi-region and deliverability features. AWS also eliminated the free tier of 3,000 messages per month for new customers starting July 21, 2026, though existing users within their 12-month window retain access. Senders using multiple AWS regions should note that plan status and billing are tracked separately per region, meaning costs can multiply significantly before a single email is sent.

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ProgrammingDEV Community ·

Oanda's Currency APIs Are Not Free and Require Brokerage Accounts

Oanda offers two distinct API products — the v20 REST API and the Exchange Rates Data API — neither of which is freely accessible to general developers. The v20 API requires a registered fxTrade brokerage account, including identity verification and, in many regions, a minimum deposit, making it impractical for simple data needs. The Exchange Rates Data API is a paid enterprise product with no free tier, sold via annual contracts reportedly starting at hundreds of dollars per month. Both products are designed for specific professional use cases — active trading and enterprise financial reporting — rather than everyday developer applications like currency converters or SaaS dashboards. Developers seeking straightforward, free or low-cost real-time FX data are generally advised to look at purpose-built alternatives such as ExchangeRate-API or AllRatesToday.

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ProgrammingDEV Community ·

14.6 Million Official Exchange Rates from 107 Institutions Now Free on Hugging Face

A newly published dataset on Hugging Face aggregates over 14.6 million official exchange rates sourced from 103 central banks and 4 tax authorities across the globe. The dataset covers historical records dating as far back as 1914, with the Swiss National Bank providing the earliest data, and spans 215 base currencies and 202 quote currencies. Unlike market-rate aggregators, these are the official published fixings used by regulators, tax offices, and customs agencies — such as ECB reference rates and Reserve Bank of India benchmarks — which cannot be derived from interbank market data. The data is structured in a consistent five-column CSV format per institution and is refreshed daily from a GitHub source repository. Released under a CC BY 4.0 license, the 515 MB dataset is freely accessible and also available in Parquet format via the Hugging Face datasets library.

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