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DEV Community • 2026-07-27 08:00

The Best Prompt Engineering Lesson I Did Not Expect to Learn

A few weeks ago, I completed Anthropic Education's AI Frameworks and Fluency course. I joined out of curiosity. One part of the course stayed with me because it described something I had already been doing while building Artificial Intelligence agents. The framework is simple. Delegation Description Discernment Diligence At first glance, those four words look like another acronym to remembe...

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Flavio Copes • 2026-07-27 08:00

Liquid Software: When Software Can Change Its Shape

Liquid software is complete, working source code designed to be understood, owned, and reshaped with the help of AI coding agents.

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1m read
DEV Community • 2026-07-27 07:57

We were cloning a copy

A product walkthrough needed a narrator: not a person, a synthesised voice reading a script over the screen recording. Simple enough on paper. We wanted four things from that voice at once, and it turned out you cannot fully satisfy all four together. Scottish — because the product carries a real name behind it, and a bland mid-Atlantic voice reading it back would have been wro...

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10m read
DEV Community • 2026-07-27 07:43

Why SPF Breaks After Adding One More Email Provider

Why SPF Breaks After Adding One More Email Provider Your SPF record may look valid and still produce a PermError. This often happens after connecting one more service: Google Workspace Microsoft 365 Mailchimp Zendesk a CRM a support platform Each include: can trigger additional DNS lookups. SPF allows no more than 10 DNS-triggering mechanisms during one evaluation. A simp...

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DEV Community • 2026-07-27 07:38

The AI-Hack

How could the Agent attack Hugging Face? OpenAI tested their newest Model GPT-5.6 Sol in an secure sandbox Environment which has an internal hosted Internet access to install third-party Software which the Agent is able to use. The prompt was to use an advanced path for ExploitGym to improve their capabilities. While the Agent operated inside the sandbox, he used a big amount of tim...

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3m read
DEV Community • 2026-07-27 07:36

We Put Our Router on an Academic Benchmark. Here Are the Numbers We'd Rather Hide.

Disclosure: I maintain Lynkr, the router being benchmarked, so read everything here with that in mind. The mitigation: every number in this post comes from RouterArena's automated evaluation pipeline, run by their CI on their infrastructure, not by me — including the numbers that make us look mediocre. Every LLM router's README — ours included — makes the same claim: it sends easy queries to chea...

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6m read
DEV Community • 2026-07-27 07:34

100 Days of DevOps and Cloud (AWS), Day 18: MariaDB's Secure Install, and Why 'Read-Only' Needs More Than ec2:Describe

The most secure version of a fresh install is the one with its convenient defaults stripped back out. New database software ships open enough to get you started fast, which is exactly the state an attacker is hoping to find. Day 18 was about closing that gap on MariaDB, then granting its mirror image on AWS access so narrow it can only look. One Linux task, one AWS task. Install MariaDB and secur...

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SQLazy:Conditional Running Total with Reset
DEV Community • 2026-07-27 07:32

SQLazy:Conditional Running Total with Reset

Problem Description Conditional running total with reset: restart accumulation when logic is 't'. An event table table_t1 records event sequences with three fields: id (sort key), logic (condition flag, values 't' or 'f'), and val (numeric value for accumulation). A computed column output needs to be added: when logic equals 't', output is set to 1; otherwise output equals the previous ...

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DEV Community • 2026-07-27 07:27

Anatomy of the Data Access Contract: Protect Your Domain from Framework Leaks (Chapter 3)

In almost every modern Java textbook, data persistence is introduced with a dangerous shortcut. You are told to create an interface, extend JpaRepository<Product, UUID>, and call it a day. The result? Without even noticing, you have tightly coupled your entire application to Spring Data and Hibernate. The moment a junior developer leaks Pageable or Specification from Spring into your clean...

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5m read
DEV Community • 2026-07-27 07:23

Building an AI Support Inbox for How WhatsApp Teams Actually Work

Building an AI Support Inbox for How WhatsApp Teams Actually Work Most customer-support software starts from an email-shaped assumption: messages arrive one at a time, belong to one person, and wait patiently in a queue. WhatsApp does not work like that. A customer may send a photo, then a voice note, then three short follow-ups. A team may need to jump between direct messages and bus...

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4m read
DEV Community • 2026-07-27 07:19

Automating Business Workflows with n8n: From Simple Triggers to Multi-Agent AI

As applications grow and business logic becomes more complex, teams often find themselves spending dozens of engineering hours writing glue code: syncing CRMs, processing webhooks, parsing documents, or triggering notification pipelines. While platform-as-a-service tools like Zapier or Make offer quick visual builders, they frequently fall short for technical teams due to strict execution limits,...

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DEV Community • 2026-07-27 07:19

The Algorithm Is the Last Decision You Make in Machine Learning

Every delivery manager I've worked with runs a prediction model on Monday morning. It's called dread. Open the portfolio, scan 30 projects, and your gut sorts them: these five worry me, those twenty are fine, and that one — that one is going to blow up this month. No math. But it's a real model: inputs (velocity, escalations, that PM who's gone quiet), weights (learned from years of pain), and an...

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DEV Community • 2026-07-27 07:17

One Unbounded Channel, 188 MB of Regret

Every producer/consumer queue I've written in the last few years sits on System.Threading.Channels, and nearly every one starts with Channel.CreateUnbounded. It's the overload that asks no questions. No capacity to pick, no full-queue policy to design, WriteAsync never waits. Last week I caught myself typing it into yet another background worker and realized I'd never measured what that convenienc...

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5m read
DEV Community • 2026-07-27 07:17

"/usr/bin/env: 'python2': No such file or directory — Amazon Linux 2023 has no Python 2"

You moved an instance, AMI, or launch template from Amazon Linux 2 to Amazon Linux 2023, and something that used to run cleanly now fails on first boot: /usr/bin/env: 'python2': No such file or directory Or, if the script called the interpreter directly: -bash: /usr/bin/python2: No such file or directory dnf works, the instance is healthy, but any script with a #!/usr/bin/python2...

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DEV Community • 2026-07-27 07:16

31.8x Speedup by Changing One File: Async Embedding Calls on AWS Bedrock

I was testing a RAG ingestion pipeline and noticed something painful: ingesting a single document took nearly 50 seconds. Checking the metrics revealed that the CPU was doing almost nothing. The app wasn't compute-bound — it was simply sitting idle, waiting for sequential HTTP network round-trips to return. By converting the blocking embedding module into an asynchronous workflow, processing tim...

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DEV Community • 2026-07-27 07:15

Common Technical SEO Mistakes Developers Should Avoid

Most technical SEO problems aren't caused by a lack of effort — they're caused by decisions that make perfect sense from a development standpoint but quietly work against search visibility. A site can be clean, fast, and well-built, and still underperform in search because of a handful of overlooked details. Here are the mistakes that show up again and again, and why they matter more than they see...

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Hacker News • 2026-07-27 07:15

Show HN: Watch 14-Byte AI "brains" attempt to solve a 2D maze (Its hard)

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Lobsters • 2026-07-27 07:13

History of John Backus's FP languages

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𝚓𝚊𝚟𝚊𝚜𝚌𝚛𝚒𝚙𝚝 • 2026-07-27 07:11

I built OpenASCII, an open source JavaScript library for high fidelity ASCII rendering

originally built this because I needed an interactive ASCII element for another project I'm working on. But, I couldn't find anything that fit what I wanted and the ones which did, were paid to export, so i decided to build the whole thing myself. OpenASC// is a high fidelity ASCII renderer for the web with real time controls and local processing. It's built with TypeScript/js and designed to be e...

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From Commit to Amazon EKS: Building a GitOps Pipeline with Argo CD
DEV Community • 2026-07-27 07:02

From Commit to Amazon EKS: Building a GitOps Pipeline with Argo CD

Deploying an application to Kubernetes is easy to demonstrate with one command: kubectl apply -f . The harder question is what happens after the first deployment. How do you know which commit is running? How do you enforce code-quality checks? How does a new container image reach the cluster without giving the CI pipeline broad Kubernetes access? And how do you clean everything up without...

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7m read
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