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ProgrammingDEV Community ·

How Freelancers Can Track Overdue Invoices Using a Simple Spreadsheet

A freelancer and spreadsheet tool creator has outlined a free method for tracking unpaid invoices using Google Sheets or Excel, without the need for dedicated accounting software. The system centres on two key sheets: an Invoices log capturing details like due dates, amounts, and status, and a Chase Log recording every follow-up action taken. A suggested chase cadence begins on the invoice due date and escalates in polite steps every three to five working days, with all communications documented for potential dispute resolution. The author emphasises consistent data entry and a simple dashboard to surface only the metrics that influence weekly action, such as total outstanding and overdue count. The guide is framed as an organisational tool only, with readers directed to qualified professionals and GOV.UK for tax, VAT, and late-payment legal compliance.

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ProgrammingDEV Community ·

Developer Migrates 90 Cypress Tests to Playwright in 4 Days Using Claude AI

A developer successfully migrated a 90-spec Cypress end-to-end test suite to Playwright in just four working days using the AI coding assistant Claude Code. The suite had been built over three years by six contributors and included a 600-line custom helpers file, with the team originally estimating the migration would take two to three sprints. The approach involved manually translating one spec first to identify conversion patterns, then codifying those findings into a structured rulebook called MIGRATION_RULES.md before letting the AI handle the remaining 89 specs. Claude Code processed the tests in batches of five, following strict rules such as never inlining custom commands and running each migrated spec three times to confirm stability. A screenshot-diff gate was also used to catch any silent behavioral changes introduced during the automated conversion process.

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ProgrammingDEV Community ·

Developer Open-Sources Lightweight Biometric Auth Library for React Native on Android

A developer named Vijesh Kumar has released an open-source Android biometric authentication library for React Native called @vijeshkr/react-native-biometric-auth. The library is built entirely with Kotlin and uses AndroidX BiometricPrompt APIs, replacing older Java-based implementations. It supports fingerprint authentication with optional fallback to device credentials such as PIN, pattern, or password. The library offers a promise-based JavaScript and TypeScript API, requiring minimal configuration for integration into React Native projects. It was created to address gaps the developer encountered in existing biometric authentication solutions while building a secure mobile application.

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ProgrammingDEV Community ·

Cloud, Local, or Self-Hosted: Three Ways AI Models Receive and Process Your Messages

When a user sends a message to an AI chatbot like ChatGPT or Gemini, the text travels over the internet to a remote server where a large language model processes it and returns a response. Developers building AI applications replicate this same request-response pattern in code rather than through a chat interface. AI models can be deployed in three ways: cloud-hosted services such as Gemini, GPT, and Claude, which charge per token and require an API key; locally on a personal machine using tools like Ollama, which is free but limited by hardware; or on privately controlled servers for organizations with strict data privacy needs. Cloud models offer superior performance and are always up to date, while local models trade capability for cost savings, privacy, and offline access. An API key acts as an authentication credential, included with every cloud request to verify the user's identity and authorize model usage.

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ProgrammingDEV Community ·

Seven DNS Monitoring False Alarms and How to Engineer Them Out

Building a reliable DNS change monitor is deceptively complex, as DNS answers vary in ways that trigger false alerts even when nothing meaningful has changed. Common pitfalls include querying recursive resolvers with stale caches instead of authoritative nameservers, and treating rotated multi-value record order as a real change. TTL countdown values and SOA serial number bumps must also be excluded from comparisons to avoid noise from routine provider behaviour. Network timeouts and SERVFAIL responses need to be handled separately from genuine record deletions, so transient failures do not generate false removal alerts. Addressing each of these issues systematically can save developers significant debugging time when building their own DNS monitoring scripts.

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ProgrammingHacker News ·

Learning a Second Language Could Be Key to Brain Health as You Age

Research suggests that learning a second language may be one of the most effective ways to maintain brain health during aging. The cognitive demands of managing multiple languages are thought to strengthen mental resilience and delay decline. This finding has gained attention in neuroscience and linguistics communities, with the topic generating discussion among readers on Hacker News. Scientists believe the mental exercise involved in language learning offers protective benefits similar to other cognitively stimulating activities. The research was highlighted by The Conversation, a publication known for academic-backed science writing.

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ProgrammingDEV Community ·

Lemmalog uses Datalog to build verifiable, traceable memory for AI agents

Lemmalog is an open-source Rust project (MIT licensed, 313 stars) that proposes replacing vector stores in AI agent memory with a deductive database built on Datalog, a mature declarative logic language. Unlike vector stores, which return similarity-matched text with no source or truth verification, Lemmalog stores facts with full provenance linked back to their origin episodes. Its engine derives new knowledge through logical rules, supports incremental updates per conversation turn, and can flag contradictions within the knowledge base. The approach is particularly suited to use cases requiring auditability and trust, such as enterprise knowledge bases and compliance systems. The project currently ships a Datalog engine, MCP server, REPL, and agent skill, but remains early-stage infrastructure rather than a ready-to-deploy memory solution.

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ProgrammingDEV Community ·

Developer Launches Free Browser-Based Screen Recorder With No Downloads or Watermarks

A developer has released a free screen recording tool called UniRecorder that runs entirely within the browser at unirecorder.online. The tool requires no downloads, imposes no watermarks, and has no time limits on recordings. It is built using the HTML5 Screen Capture API and MediaRecorder API, meaning all video processing happens locally on the user's device. The recorder supports resolutions up to 4K at 60FPS, webcam overlay, and dual audio capture from both microphone and system sources. It is compatible with all modern browsers and the developer is actively seeking user feedback.

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ProgrammingDEV Community ·

Microsoft Chief Scientist Calls AI Data Scraping 'Largest Theft of Labor in History'

Microsoft Chief Scientist Kate Crawford has issued a stark warning that AI-powered data scraping represents what she calls the largest theft of labor in human history. AI scraping refers to the automated extraction of data from websites, APIs, and other digital sources using machine learning techniques that can mimic human behavior and evade detection. Unlike traditional web scraping, these AI-driven tools can adapt to website changes, bypass security measures like CAPTCHAs, and reverse-engineer application logic. The practice poses serious risks to developers and businesses, including intellectual property theft, data breaches, and server overloads that can cause denial-of-service disruptions. Competitors can also exploit scraped data to replicate products or gain unfair market advantages, raising urgent concerns about regulation and digital rights.

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ProgrammingDEV Community ·

Developer Builds EchoCadence, a Spaced-Repetition Vocabulary App Using Tiger Cloud

A developer created EchoCadence, a vocabulary learning app, as part of MLH's Global Hack Week: Data challenge, which featured Tiger Cloud as a partner technology. The app is built around spaced repetition, a method that schedules word reviews at increasing intervals to help users retain vocabulary long-term. Users can sign up, select up to seven languages simultaneously, add words via built-in or custom categories, and rate card difficulty after each review to inform future scheduling. Unlike AI-driven recommendation systems, EchoCadence relies on a classic spaced-repetition algorithm and a carefully structured data model that tracks each card's review history and scheduling state. The app targets anyone who can recognize words passively but wants to build an active, usable vocabulary in one or more languages.

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ProgrammingDEV Community ·

Claude Code Hooks Let Developers Run Custom Scripts at Key Workflow Moments

Claude Code supports a feature called hooks that allows developers to execute custom scripts at specific points in the AI coding assistant's workflow, such as before or after a tool runs. Unlike permission rules, which only gate whether an action is allowed, hooks can actively perform tasks like formatting files, logging session activity, or blocking a git push if no matching test file was updated. Two primary hook types exist: PreToolUse, which fires before a tool executes and can still block it, and PostToolUse, which fires after execution and can trigger follow-up actions. Hooks are configured inside the same .claude/settings.json file used for permissions, with each hook pointing to a shell script or command to run. Notably, these hooks only apply within Claude Code sessions and do not replace native git hooks or govern manual actions taken outside the tool.

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ProgrammingDEV Community ·

Developer Builds Athlete Pressure-Performance Detector Using CBT Research and Plain JS

A developer has created a tool that detects choking-under-pressure patterns in athletes using only JavaScript, without any AI or machine learning. The project relies on four decades of Cognitive Behavioral Therapy research as its analytical foundation. The entire implementation was achieved in approximately 80 lines of JavaScript code. No third-party sports psychology APIs or AI services were integrated into the solution. The project highlights how established psychological research can power practical tools without relying on modern AI infrastructure.

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ProgrammingDEV Community ·

Java Developer Documents Self-Taught AWS Journey Targeting Solutions Architect Cert

A Java developer with enterprise Spring Boot and microservices experience has begun a structured, public series documenting their transition into AWS cloud architecture. Despite working daily with Kubernetes and Kafka, the developer acknowledges they never designed the underlying platform infrastructure from scratch. Their goal is to become a solutions architect, using the AWS Certified Solutions Architect Associate (SAA-C03) exam as a learning framework. The self-study plan spans several weeks, covering EC2, storage, load balancing, databases, and eventually serverless and managed AWS equivalents of familiar tools. The developer is using a free-tier AWS account with billing alerts to safely run experiments without unexpected costs.

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ProgrammingDEV Community ·

CSS field-sizing Property Lets Text Areas Auto-Resize Without JavaScript

A new CSS property called field-sizing: content is now supported across all major browsers, having landed in Chrome 123, Safari 26.2, and Firefox 152. The property allows form elements like text areas and text inputs to automatically grow or shrink based on their content, eliminating the need for JavaScript workarounds. Previously, developers had to use resize event listeners and manually calculate scroll height to achieve the same dynamic resizing effect. The property also works on select elements, number inputs, and search inputs, and respects placeholder text when sizing empty fields. Developers can pair it with min-height and max-height values — using units like lh for line height — to control the sizing range of the element.

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ProgrammingHacker News ·

Developer Builds Graphical Desktop Environment for the ZX Spectrum

A developer has created ZXDesk, a graphical desktop interface designed to run on the classic ZX Spectrum home computer. The project, hosted on GitHub under the username mindbox77, brings a windowed desktop experience to the decades-old 8-bit machine. The ZX Spectrum, originally released by Sinclair Research in 1982, was never designed to support a graphical desktop environment. The project has attracted early attention on Hacker News, where it was shared for community discussion and feedback.

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ProgrammingDEV Community ·

Developer Launches Free Online Scientific Calculator With Natural Math Display

A developer has released a free online scientific calculator at onlinescientificcalc.com, requiring no signup or download. The tool renders mathematical expressions in natural notation — such as proper fractions — rather than flat text, addressing a common limitation of existing online calculators. It is built using Astro.js and Tailwind CSS v4, and its layout is modeled after the Casio fx-991, including its SHIFT and ALPHA key system. The project was simultaneously launched on Product Hunt and marks the developer's first publicly shipped tool. The creator is actively seeking community feedback on performance and user experience.

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ProgrammingHacker News ·

Developer Builds Personal Weatherman Device That Also Delivers News Updates

A developer has created a custom device that functions as both a personal weather station and a news briefing tool. The project, shared on the personal blog dexteroot.net, is documented as the first part of an ongoing series. The build combines weather data display with news delivery in a single DIY system. The post was shared on Hacker News, where it received a small number of upvotes and no comments at the time of writing.

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ProgrammingDEV Community ·

Supabase default settings silently granted anon users TRUNCATE rights on all tables

A developer discovered that Supabase's default schema configuration had automatically granted the 'anon' and 'authenticated' roles TRUNCATE and TRIGGER privileges on 96 and 109 tables respectively, without any action on their part. The root cause was a platform-level default ACL entry that applies these privileges to every new table created in the public schema. Unlike SELECT, INSERT, UPDATE, and DELETE, TRUNCATE is not governed by PostgreSQL's row-level security, meaning RLS policies offer no protection against it. The developer's own pre-commit migration checker failed to catch the issue because it only validated what was explicitly written, not what the platform silently added by default. A repair migration was written to revoke the privileges, though a follow-up check revealed the fix had missed seven views due to a filter that excluded non-standard relation types.

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ProgrammingDEV Community ·

Ego Development Framework Maps Software Developers Across Eight Psychological Stages

A detailed framework adapted from psychologist Susanne Cook-Greuter's ego development model profiles software developers across eight distinct stages, from self-centric to construct-aware. Each stage describes how a developer relates to authority, code review, feedback, remote work, AI tools, and career growth. Research from Cook-Greuter's sample of 4,510 adults suggests most working professionals cluster around stages E5 and E6, meaning the majority of developers are likely skill- or principle-driven. The framework emphasizes that stage is not a fixed personality label — individuals can operate at different levels across different domains, and stress can temporarily push anyone toward earlier-stage behavior. The profiles are intended as developmental snapshots to help teams understand working styles and assign roles that align with a developer's current strengths.

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ProgrammingHacker News ·

A Rust Developer's First Impressions of the Zig Programming Language

A developer with a background in Rust shared their experience transitioning to the Zig programming language in a personal blog post. The article explores the similarities and differences between the two systems programming languages from a practical standpoint. The author reflects on how Zig's design philosophy and tooling compare to what Rust developers are accustomed to. The post was shared on Hacker News, where it attracted early attention from the programming community.

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