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The Pragmatic Engineer

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Building Reddit’s iOS and Android app

Reddit’s native mobile apps for iOS and Android are complex, with about 2.5 million lines of code, 500+ screens, and 200 engineers working on them.
In 2021, Reddit revamped its mobile apps, introducing a new tech stack called the “Core Stack” and enhancing user experience.
On 'The Pragmatic Engineer' podcast, Reddit's mobile platform team discusses the app's evolution, architecture, testing strategies, and developer experience.
The team transitioned to a modern architecture, utilized Jetpack Compose for Android, and focused on server-driven mobile UI.
Challenges included the app's scale, compile time, testing, and migration to new frameworks like SwiftUI and GraphQL.
Reddit's mobile team emphasized the importance of good developer experience and the impacts of modernizing their tech stack.
Lessons learned included the complexity of native mobile development, the benefits of modern tools, and the value of platform engineering.
The episode highlights the journey of Reddit's mobile apps, discussing team structures, architecture decisions, and experimental approaches.
Key topics covered include iOS and Android engineering, codebase complexity, user experience improvements, and hiring traits for platform teams.
Insights were shared on modernizing tech stacks, migration challenges, AI in workflows, testing strategies, and the culture of experimentation at Reddit.
The podcast episode provided valuable insights on large-scale mobile rewrites, native mobile challenges, and the evolution of Reddit’s mobile app development.

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Python Blogs

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How many devices can Archer AX73 connect to?

The TP-Link Archer AX73 is a high-performance Wi-Fi 6 router capable of handling up to 200 devices simultaneously.
It utilizes advanced technologies such as OFDMA, MU-MIMO, and Beamforming to optimize performance in high-density environments.
Real-world performance may vary based on factors like network bandwidth, interference, and the type of data each device is using.
The router also features a Tri-Core CPU, 1024-QAM modulation, and high-gain antennas to enhance capacity and ensure stable connections.

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Dev

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JavaScript Lambda Functions Using a Bun Custom Runtime

The Bun custom Lambda runtime offers an alternative to Node.js and Deno for Lambda functions, with features like ease of use and speed.
Custom Lambda runtimes, like Bun, are distributed as Lambda Layers, built on Amazon Linux OS runtimes, and require specific APIs to work with Lambda service.
Building and deploying the Bun Layer to AWS involves commands provided in the bun-lambda package's readme.
When creating Lambda functions with Bun, adding the bun or bun-arm64 Lambda layer and returning a Response object from the handler is needed.
Bun simplifies Lambda function creation with its built-in high-performance web server features, supporting WebSocket and Amazon API Gateway requests.
Bun's custom runtime focuses on supporting integrations with API Gateway but also works with other event sources like SQS, SNS, S3, EventBridge, etc.
Local testing with Bun can be done using the Bun server format, enabling running of the handler function locally.
In testing speed, Bun Lambdas show competitive performance, with average execution times and cold starts compared to Node.js Lambdas.
While there are significant speed differences between Node.js and Bun Lambdas, Bun offers good performance, ease of use, and compatibility with Node.js.
Overall, Bun custom Lambda runtime provides a faster and developer-friendly alternative for building Lambda functions, suitable for production use.

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Medium

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PostgreSQL vs MySQL vs Redis: Choose Your Fighter

Choosing the right database for your project is a common challenge.
PostgreSQL, MySQL, and Redis are three popular options to consider.
Each database has its strengths and use cases.
It's crucial to pick the right tool based on your data's requirements.

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Dev

378

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50 CSS Tricks to Master in 2025: Enhance Your Web Design Skills

The article '50 CSS Tricks to Master in 2025' emphasizes the importance of mastering advanced CSS techniques for creating modern and visually appealing websites.
Covering layout strategies, animation effects, image handling, and UI enhancements, these 50 CSS tricks cater to beginners and seasoned developers alike.
Tricks include centering elements with Flexbox, creating responsive grid layouts, customizing scrollbars, and implementing parallax scrolling effects.
Advanced styling tips like using box-shadow effects, responsive font sizes, gradient backgrounds, and CSS Grid for named areas are also highlighted.
Transition effects, floating labels, CSS masking, and utilizing CSS variables are part of the techniques outlined to enhance web design skills.
The article delves into creating UI elements like vertical text, toast notifications, tooltip customizations, and transparent backgrounds using CSS.
Furthermore, it covers techniques for creating a CSS-only lightbox, animated gradients, and other engaging web elements for a dynamic user experience.
The author recommends continuous practice of these CSS tricks to excel in web development and directs readers to explore further resources for mastering web design.
For those interested in a more detailed guide, the author suggests checking out their book on Gumroad and offers support through Ko-fi.
Mastering CSS is an evolving process, and honing these skills will empower developers to craft exceptional websites with enhanced user interfaces.
With these innovative CSS tricks, developers can elevate their web design capabilities and stay at the forefront of creating engaging online experiences.

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Dev

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Designing Ethical AI Systems: A Developer’s Guide to Responsible Innovation

AI developers have increasing responsibility for the societal impact of their code.
Ethical AI requires understanding the context and potential impacts on different stakeholders.
Addressing bias in training data and ensuring transparency are crucial for ethical AI systems.
Consent, privacy, and ongoing monitoring are key considerations for ethical AI development.

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7 Likes

Medium

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How I Tricked My Brain Into Loving Boring Tasks — and Learned to Code Because of It

The author shares their experience of learning to code without formal education or a mentor.
They emphasize the importance of finding motivation and interest in boring coding tasks.
The author suggests gamifying and romanticizing the process of learning to code.
They believe that coding teaches valuable skills such as patience and problem-solving.

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Alvinashcraft

Dew Drop – April 23, 2025 (#4405)

Microsoft Build 2025 highlights include .NET and C# teams joining, Windows App SDK 1.8.0 Experimental 1 release, and GitHub Copilot features in Visual Studio 17.14 Preview 3.
Web & Cloud Development updates cover Azure Container Apps, Blazor PWAs, YARP integration, and GraphQL usage in .NET.
WinUI, .NET MAUI & XAML content includes using MVVM Toolkit, AI-Powered Air Quality Dashboard, and updates on WPF in .NET 9.0.
Visual Studio & .NET topics feature Nadaraya-Watson Kernel Regression, ReSharper 2025.1 updates, and leveraging EF Core for date handling.
AI-related articles discuss multiagent research, GitHub Copilot models, and Azure AI agents integration.
Design, Methodology & Testing articles encompass Azure Boards updates, CI/CD security best practices, and bug report writing tips.
Mobile, IoT & Game Development content covers Firebase Cloud Messaging on Android and building a home recording studio with Raspberry Pi 500.
Articles on Database topics include SQL Server procedures, CHOOSE function exploration, and SSMS 21 Preview 6 release.
SharePoint, M365 & MS Teams updates feature Microsoft Graph API reports and Microsoft 365 Copilot Power User Tips.
PowerShell & Terminal content includes PowerShell Universal v5.5 updates and Docker x Warp information.
Miscellaneous articles touch on Windows 11 Insider Preview Builds, DIY email solutions like Notion Mail, and the alarming decline of bees.

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Hackernoon

Image Credit: Hackernoon

This Web App Turns Any Image Into a Retro Fever Dream—No Photoshop Needed

The web app discussed in the article enables users to turn any image into a retro-inspired creation without needing Photoshop.
The tutorial focuses on enhancing image manipulation options through color and visual effects fine-tuning.
Introducing new tools in the app provides more flexibility in image editing and explores the HSV color model for adjusting hues, saturation, and lightness.
The app now includes a feature to adjust the number of colors extracted from an image, allowing for better control over visual effects and filter results.
Users can experiment with adjusting the number of colors and see the impact on the overall image appearance using a color count slider.
Another enhancement is the addition of a filter intensity slider to control the balance between original image colors and the applied palette.
The article provides insights into the HSV color model and its benefits over RGB and LAB models, offering a more intuitive approach to color representation.
To demonstrate the results of adjustments, examples of images in the same palette but different color models are presented.
The tutorial covers contrast adjustments with a slider enabling users to enhance or reduce contrast in their images for a more vivid and impactful appearance.
The addition of a noise slider allows users to introduce random variations to create vintage effects or add texture to images.
Color correction and manipulation play a vital role in enhancing images, and the article explores tools like contrast, saturation, and noise for creative transformations.

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Medium

206

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Pixel Pioneers Bristol 2025 Speaker Spotlight: Jack Franklin

The importance of communication, especially in a large, distributed company, is a key lesson learned by Jack Franklin.
In his role as a technical lead for performance tooling, Jack focuses on unblocking the team, reviewing proposed changes, and advising on ideas.
Jack highlights the need for a deeper understanding of web performance and demystifying key metrics to improve website performance.
At Pixel Pioneers Bristol 2025, Jack Franklin will share insights on debugging website performance and other web-related topics.

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Dev

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Biblically Accurate Rust 😇

Rust is a programming language prioritizing performance and memory safety.
It enforces strict safety rules at compile time, catching issues early.
Rust requires deeper thinking about data usage but promises reliability.
Ideal for high-performance applications like operating systems or game engines.
Suitable for systems programming, web development, and embedded systems.
Steep learning curve but rewarding for writing clean and efficient code.
Strong community support and resource availability for learners.
Rust tooling includes Cargo for package management and rustfmt for code formatting.
Rust features like ownership, borrowing, and lifetimes enhance memory safety.
Generics, optional enums, enums, and traits provide flexibility and type safety in Rust.

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Dev

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10 Advanced Ruby on Rails Features

Strict Loading: An advanced feature in Ruby on Rails that raises an error when an association lazy-loads, helping to catch N + 1 problems during the coding phase.
Asynchronous Queries: Allows off-loading expensive SQL to a background pool while the request continues to execute.
Multi-Database Connection Switching & Sharding: Provides support for read-replica traffic and horizontal shards in Ruby on Rails.
Delegated Types: Offers an alternative to Single Table Inheritance (STI) and polymorphic associations in Rails models.

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Dev

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How to Sync Users Logged in by Google and GitHub to Your Database With Neon Auth for Free

Neon Auth simplifies the synchronization of users logged in by Google and GitHub to a Postgres database without the need for extra code or webhooks.
It automatically syncs user data in near real-time, making user management easier and hassle-free.
The process involves setting up Neon Auth, linking authentication providers with a Postgres database, and accessing user data through the neon_auth.users_sync table.
Neon Auth handles user synchronization by creating a dedicated neon_auth schema and users_sync table in the database.
Sensitive information like passwords is not synced to Neon Auth, ensuring user privacy and security.
Building a .NET Application with Neon Auth is simplified, allowing for easy integration of real user data into your application.
.NET Application entities like User and ProductCart can be connected to Neon users for efficient data management.
Neon Auth provides API endpoints for creating product carts with connected users, streamlining the process for online store development.
By using Neon Auth, developers can save time, reduce complexity, and benefit from near real-time user synchronization for a seamless user experience.
Neon Auth streamlines the process of managing user data from external providers, offering automatic syncing of profiles into a Postgres database.

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Dev

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Test isolation is (not) fun

Test isolation involves ensuring that individual tests do not interfere with each other in automated testing.
Challenges in test isolation can arise due to user contexts, such as personalized cookie settings, in the browser.
Test isolation principles often conflict with the temptation to combine tests for efficiency, impacting parallelization.
Proper isolation is crucial for parallel test execution, requiring separate entities like user accounts for each test.
Data isolation in testing involves managing data movements like creating users, preparing test environments, and cleaning up data.
Isolating data between tests, sequential test runs, and parallel runs is essential to avoid conflicts and ensure test stability.
A data factory pattern can be used to generate unique data sets for each test, reducing conflicts in parallel test execution.
Cleaning up test data before or after test execution is crucial to prevent data accumulation and system slowdowns.
Continuous evolution of data isolation strategies is necessary to align with changing product needs and improve test suite efficiency.
At Octomind, a test factory pattern is used to ensure test isolation by generating unique data for each test, enabling parallel execution and preventing data collisions.

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Dev

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🍭 Debouncing vs Throttling — Explained Through a Cute Story of a Daughter and Her Mother!

Debouncing and throttling are two powerful techniques used in frontend development for performance optimization.
Debouncing waits for the last request and proceeds only after the user stops making requests for a while.
Throttling ensures that a function runs at most once in a specific interval, even if triggered multiple times.
Debouncing and throttling effectively manage rapid user interactions and help in improving performance.

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