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The best AI tools for conversion rate optimization (CRO) in 2026 are the platforms that continuously...

Today I discovered something I honestly should have explored a long time ago: Google Lighthouse. Funny enough, revamping my portfolio is one of those projects I kept pushing forward with the classic “I’ll do it tomorrow” mindset — and somehow tomorrow kept winning. But today I finally sat down and started improving it, and during that process, I came across Lighthouse. For anyone who hasn’t heard of it yet, Google Lighthouse is an open-source automated tool designed to help developers improve the quality of web pages. You can run it on almost any page — whether it’s public or behind authentication. What immediately caught my attention is that it audits things like: Performance Accessibility SEO Best Practices And probably a few more things I’m still discovering You can run Lighthouse directly inside Chrome DevTools, through the command line, or even as a Node.js module. The process is simple: You give Lighthouse a URL, it scans the page, runs a series of audits, and then generates a detailed report showing how your website performs. What makes it powerful is that it doesn’t just tell you what’s wrong it also explains: _ Why the issue matters How it affects users And how you can fix it _ As a beginner software engineer and developer, I’m slowly realizing that writing code is only one part of building great applications. Performance, accessibility, maintainability, and user experience matter just as much. And honestly, tools like Lighthouse make the learning process feel less overwhelming because they point you in the right direction. One thing I’ll say though don’t fall into the trap of chasing a perfect Lighthouse score instead of building useful projects. A lot of developers start optimizing numbers before validating whether the product itself solves a real problem. Lighthouse is a guide, not the final goal. For my portfolio specifically, Lighthouse exposed a few weaknesses immediately: Large unoptimized images Accessibility issues Slow-loading assets Missing metad

Hey Dev.to the community, I'm Ashwin Gururaj — a Data Scientist & AI Engineer based in Melbourne, Australia, currently open to full-time, contract, and internship opportunities. I specialise in building production-grade AI systems — not just notebooks and demos, but end-to-end pipelines that actually run in production. What I work with: Python · LangChain · LangGraph · FastAPI · RAG pipelines · pgvector · Multi-agent systems · LLMs · Groq · HuggingFace · Pydantic · Docker · Celery · Redis · PostgreSQL · Data Science · SQL · Pandas · Scikit-learn What I've built recently: Sift — an open-source multi-agent fact-checking pipeline. Takes any text, extracts every factual claim, retrieves grounded evidence via HyDE RAG + live web search, and returns auditable verdicts with cited sources. Built with LangGraph, pgvector, FastAPI, and Docker. → GitHub Open to: Full-time Data Scientist / AI Engineer / ML Engineer roles Remote or Melbourne-based Companies building serious AI products If you're hiring or know someone who is — I'd genuinely appreciate a connection. GitHub: https://github.com/ashg2099 LinkedIn: https://www.linkedin.com/in/ashwin-gururaj-93943816a/ Thanks!

Everyone can build it. Almost no one can afford to run it at scale. And the companies selling the picks and shovels are about to get undercut by the same forces they unleashed. by VEKTOR Memory — 20 min read How This Article Started: 20 Forums, 40 Headlines, and a Growing Sense That Everyone Was Confused I woke up to clear skies and the sun finally shining, and I set out to understand this idea, the truth behind it, and the nagging suspicion that the narrative around AI and software costs had become so loud, so uniform, and so confidently confusing that someone needed to sit down and actually go through it. No tweets, or are they now X's? No LinkedIn thought leader infomercials, no Substack hype, just actual research and deep thoughts. So I spent time reading, collating data. Forums, whitepapers, LinkedIn posts, Hacker News threads, VC essays, Reddit arguments. I went looking for the real signal underneath the noise. What I found instead was the full spectrum of human overconfidence, lots of moat real estate. On one end: the hype machine at full throttle. “Software is going to zero.” “A solo dev can now build what a 50-person team built in 2021.” “The era of the $500/month SaaS subscription is over.” “Vibe coding will replace your entire engineering org.” These headlines were everywhere. Breathless. Confident. Shared tens of thousands of times, this angle gets views, of course, the algorithm loves being fed claps, shares, comments, and reposts. Most were written by people who had a very good Tuesday with Codex, Windsurf, Claude and Cursor and decided that instant dev, open source to Github and getting oodles of stars, maybe even roping in a celebrity, was now the permanent condition of software development. “We are now famous on GitHub!" Very hipster, very vibes, see you on the playa.. On the other end: the backlash. Experienced engineer, people with 15 to 25 years in production systems are pushing back hard. “Show me the vibe-coded app that survived its first real

We were burning 400ms in p99 tail latency on a core event-processing path in Veltrix. The upstream teams kept blaming the network, but the numbers didnt lie—64% of the time was spent inside the JVM, specifically in sun.misc.Unsafe.park during GC pauses. Every time we hit 80% heap pressure, the throughput collapsed and we lost 300k events per minute. That was the exact moment I stopped believing in the JVM as the runtime and started looking at the system boundary. The first attempt was aggressively tuned HotSpot with G1GC and pinning the critical threads to their own NUMA nodes. We set -XX:MaxGCPauseMillis=20 , -XX:+UseNUMA , and even migrated to Azul Zulu Prime because its handling of large heaps was supposedly better. The p99 dropped to 280ms, but the GC telemetry still showed a sawtooth pattern of 30–40ms spikes every 230ms on a 16GB heap. Profiling with JDK Flight Recorder told us 18% of CPU time was spent in card-table scanning. At that point I knew we were fighting the runtime, not the problem. The event pipeline was small—just JSON parsing, enrichment, and a single RocksDB write—but the JVMs generational collector couldnt stop moving objects. The architecture decision came during a four-day blackout window after a failed Blue-Green deploy. Three of us sat in a war room with a single Grafana dashboard showing 100% CPU steal time on the Kubernetes nodes. We had two choices: squeeze more life out of the JVM by manually balancing the heap or rewrite the critical hot path in Rust and give the compiler full control over memory layout. The Rust option meant losing the JVM ecosystem (no more async-profiler, no more one-liner heap dumps) but gave us stackless futures, zero-cost abstractions, and compile-time memory safety. We chose Rust. We forked the Cargo.toml wed used in a sidecar for metrics and started porting the event collector. The numbers after the rewrite told the story. We recompiled the same two endpoints— POST /events and GET /aggregates —and served them f

I Built a Local AI Agent That Thinks Like a Brain, Not a Database Most AI agents today are sophisticated autocomplete engines. Ask them something, they answer. Ask again in a new conversation, they start from zero. The context window is the only memory they have. Serenity is different. It's a fully local AI agent that encodes experiences the way biological brains do — semantically clustered, causally structured, and self-organizing. No cloud. No API calls to a vector database. No data leaves your machine. Ever. The Core Problem with Current AI Memory The standard approach to AI memory is essentially a hack: you stuff embeddings into a vector DB, do nearest-neighbor retrieval, and dump the results into the prompt. It sort of works. But it's not how brains work. Your brain doesn't search for memories. When one fires, related ones light up automatically. Serenity's architecture — called S.E.R.A (Semantic Experience Reasoning Agent) — tries to bridge that gap. Here's the key difference: Traditional Approach Serenity Vector search on embeddings Semantic node activation Prompt-injected context Persistent working memory One-shot retrieval Emergent recall via association Static embeddings Pruned & crystallized over time How It Works: The Neural Node Network At the core is the Neural Node Network (NNN) . Instead of storing facts in isolation, Serenity encodes experiences in causal format: ACTION → BEFORE → OUTCOME → AFTER When she learns something, she doesn't file it in a folder. She finds where it semantically belongs in a web of related concepts. Similar things cluster together — the same way neurons that fire together wire together. Then the abstraction layer kicks in. Three or more related concepts crystallize into a higher-order node: the thing they all have in common that none of them says directly. Those nodes bundle into pathways. Those pathways grow into domains. She also has inhibitors and pruning — weak connections get cut so strong ones sharpen. Her knowledge ge

Claims about low testosterone and false accusations of veganism might play well to the online far right, but will they win an election?

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The Rockstar Game Workers Union has members across the developer's UK offices.

Every token your agent spends on file I/O is wasted reasoning capacity. I was building a document processing agent — the kind that reads incoming research reports, extracts key findings, and produces executive briefings. Nothing exotic. The kind of workflow thousands of teams are automating right now. The PDF I was testing with was 2MB. Dense text. A typical industry research report. When I measured the token cost of processing it inline, the number was 97,354 input tokens — just to get the text into Claude's context. At claude-sonnet-4-6 pricing, that's $0.29 per document. For a pipeline that processes 500 reports a month, you're looking at $150/month before your agent writes a single word of output. That's the problem nobody talks about in the AI agent space. Everyone optimises prompt engineering and output tokens. The silent cost is input: the files, the content, the raw data you're shoving into context before the agent can do anything useful. How the token count explodes When you pass a document to an agent inline, one of two things happens: Option A — Base64 encoding. You read the binary file, encode it, embed it in the prompt. A 2MB PDF in base64 is ~2.7MB of text. At roughly 3.5 characters per token, that's ~770,000 tokens before your agent has read a single word. This is catastrophic. Don't do this. Option B — Text extraction. You extract the raw text content first (via pdftotext , PyMuPDF, or equivalent), then pass the text to the agent. Better — but a 2MB PDF with dense content still yields ~97,000 tokens of extracted text. You've paid for every word, every header, every footnote. Either way, the document content dominates your context window, crowds out your system prompt, and you're burning money on file I/O instead of reasoning. The alternative: specialist services via MCP Model Context Protocol (MCP) is Anthropic's open standard for connecting AI agents to external tools and services. The key insight is simple: your agent doesn't need to contain the co

This is a submission for the Hermes Agent Challenge : Write About Hermes Agent I Didn't Start With Hermes Six months ago I started building a set of agent skills and personas for how I build software. Not generic prompts — opinionated role files. A /backend-architect that owns schema and recommendation logic. A /test-engineer that writes Vitest coverage and flags weak acceptance criteria. A /project-manager that maintains planning docs and closes iterations cleanly. These roles have evolved across multiple projects. They have layering rules, discovery checklists, inheritance from a base engineering discipline file. They produce consistent, reviewable work because they're scoped — the backend architect doesn't touch test files, the test engineer doesn't redesign the schema, each persona has a defined mandate and exits cleanly. When I heard about Hermes Agent, my first instinct wasn't "let me learn a new system." It was: can I run my existing system inside this? The answer is yes. That's what this article is about — what it looks like to bring a mature workflow into Hermes, what you gain, where it breaks down, and what I'd do differently. What Hermes Is (and Isn't) to Someone Who Already Has a Workflow Hermes is an LLM-agnostic orchestration layer. It has its own skill system, its own soul.md concept for persistent agent identity, built-in cron scheduling and MCP management. All of that is real and useful. But it's also a runtime. If you have skills that work, you can bring them in. I installed a local Hermes instance — few clicks, straightforward setup — and ran it inside VSCode's integrated terminal pointed at my existing persona files. No migration. No rewrite. My /backend-architect runs in Hermes the same way it runs in Claude Code. Before settling on this, I'd tried a couple of other paths — a VPS instance with a Telegram interface for ideation, and attempting to build through a browser-based terminal. The VPS was fine for sketching ideas. The browser terminal ma

🌟 Announcing the 2nd Workshop on Social Simulation with LLMs (Social Sim'26) @ COLM 📣 Welcoming Submissions! Submission here:. 🗓️ Deadline: June 23, 2026 (AoE) This year's theme is "Fidelity in Applications”, moving beyond compelling demos toward evaluation, robustness, interpretability, and empirical grounding of LLM-based simulated societies. 💬 Topics include (but aren't limited to): 🔹 Simulation evaluation & fidelity 🔹 Validation against real-world social data 🔹 LLM-based agent modeling 🔹 Persona modeling 🔹 Cultural evolution 🔹 Information diffusion in simulated populations 🔹 Human–AI hybrid simulations 🔹 Simulation interpretability 🔹 Applications: governance, platform design, societal risk analysis 🔹 Ethical, societal & policy implications of large-scale simulated societies 🤝 We invite perspectives from ML, social science, psychology, and policy — anyone building, validating, or reasoning about LLM-driven simulated societies. Hope to see you in SF! 🌉 submitted by /u/RSTZZZ [link] [留言]

RAG SOTA, Agent Harnessing, and Langfuse Observability for AI Frameworks Today's Highlights Today's top stories delve into optimizing RAG performance with open-source benchmarks, designing robust AI agent systems, and implementing best practices for LLM observability in production. RAG SOTA: I Tested 7 Pipelines and Built SEQUOIA (Open Source) (Dev.to Top) Source: https://dev.to/__2ddbae6bb7d/--5cec This article presents a comprehensive benchmark of seven Retrieval-Augmented Generation (RAG) pipelines, culminating in the development and open-sourcing of SEQUOIA, a new RAG system. The author details over 20 hours of compute time spent locally to rigorously test different RAG configurations against real-world tasks, providing valuable insights into their performance characteristics. The technical deep dive includes discussions on various components like chunking strategies, embedding models, vector databases, and re-rankers, along with their impact on retrieval quality and generation coherence. Readers gain an understanding of the trade-offs involved in designing effective RAG systems and the empirical evidence supporting different architectural choices. The release of SEQUOIA as an open-source project means developers can directly implement and experiment with a battle-tested RAG pipeline, offering a tangible starting point for their own projects. Comment: This is an invaluable resource for anyone building RAG. Benchmarking 7 pipelines and open-sourcing a well-performing one provides immediate practical value and a solid foundation for further experimentation. Stop Upgrading the Model. Start Engineering the Harness. (Dev.to Top) Source: https://dev.to/tacoda/stop-upgrading-the-model-start-engineering-the-harness-194 This insightful article argues that instead of solely focusing on larger or "better" base models, teams should invest in "engineering the harness" around their AI agents to improve performance. The author highlights that the supporting architecture—compri

RAG SOTA: I Tested 7 Pipelines and Built SEQUOIA (Open Source) After 20+ hours of compute time on local hardware, I benchmarked 7 RAG configurations against real-world tasks. SEQUOIA (RAPTOR tree + step-back prompting) consistently outperformed alternatives. The Full Pipeline List Method Core Approach No-RAG Direct LLM generation Classical RAG Dense retrieval (BGE-small + FAISS) Hybrid RAG BM25 + Dense + RRF + reranker LightRAG Key-value graph + dense hybrid PageIndex Two-stage hierarchical retrieval GraphRAG Entity graph + dense fallback Agentic RAG Multi-step reasoning pipeline SEQUOIA RAPTOR tree + step-back prompting SEQUOIA Pro Multi-query + rerank + compression Why LightRAG Underperformed The hype suggested graph-based RAG would revolutionize retrieval. On real banking documents and technical manuals: Graph construction is expensive (entity extraction, relationship mapping) Retrieval quality did not justify the overhead Academic benchmarks do not equal production reality Why RAPTOR Works Recursive Abstractive Processing for Tree-Organized Retrieval: Cluster leaf nodes (individual chunks) Summarize upward (hierarchical abstraction) Retrieve at multiple levels (specific details + high-level context) This mirrors how humans organize knowledge. Step-Back Prompting: Free Performance Before retrieving, generalize the query: User asks: "What's the error rate for Q3?" Step-back: "What metrics are tracked quarterly?" Retrieve broader context first, then narrow Result: ~15% improvement in recall. Zero latency cost. SEQUOIA Architecture User Query Step-back Prompting (generalize) RAPTOR Tree Retrieval (multi-level) Context Compression (summarize long contexts) Re-ranking (cross-encoder) Local LLM Generation Local LLM Evaluation I used a local model weaker than GPT-4 for judging. Key finding: relative rankings between methods stayed consistent even with a weaker evaluator. You can prototype and compare approaches without burning API credits on GPT-4 evaluations. Productio

Fine-tuning tests show "bias ... toward confidently representing the claims as true."

This is a submission for the Hermes Agent Challenge : Build With Hermes Agent What I Built Real brewing knowledge lives in human experience — in roaster guides, in community notes, in what a barista learned from last Tuesday's pour. It doesn't accumulate anywhere. Every brew is forgotten. Ask any AI and you get statistical averages: 93°C, 1:16 ratio, four minutes. Technically defensible. Practically generic. Worse still for rare origins where training data is thin. Demo For coffee drinkers Visit brew-guide-production.up.railway.app . No account. No setup. No AI client required. Pick your coffee origin, roast level, and brew method. What comes back isn't a generic recipe — it's community consensus: the grind, temperature, ratio, and brew time that real people have logged and rated for that origin, plus step-by-step technique guidance (bloom timing, pour stages, agitation style). If data is sparse for your origin, the confidence tier says so honestly and falls back to method defaults rather than making something up. This is for the person who just picked up a bag of Kenyan peaberry and wants to know how to do it justice. It works for anyone who cares about their cup — no technical knowledge required. For developers and AI clients Connect to any MCP-capable client in one line: https://brew-guide-production.up.railway.app/mcp Ask your AI: "recommend a pour over for Ethiopian light roast." What comes back is a traceable community consensus object: brew parameters, a confidence tier (high/medium/low), the source brews that contributed, and method-specific technique guidance. You can see where the knowledge came from and how certain the system is — a fundamentally different epistemic object from an AI-generated recipe. Code GitHub: yuens1002/brew-guide Five MCP tools — get_brewing_methods , recommend , log_brew , search_brews , compare_brew — over Streamable HTTP transport. Public, no auth required. My Tech Stack Layer Technology HTTP Hono 4 + @hono/node-server MCP @modelc

When most people think about UK data sources to scrape, they go straight to Companies House. And they should — it's an excellent dataset. But there's a more valuable register that compliance teams, fintech sales teams, and KYC workflows desperately need, and it has zero scrapers on the Apify marketplace: the FCA Financial Services Register. The Financial Conduct Authority maintains a live register of every firm authorised to provide financial services in the UK — ~50,000 firms ranging from Barclays Bank to a one-person IFA. It includes their regulated permissions (what they're actually allowed to do), their principal address, trading names, and enforcement history. It's the data source used to verify "is this firm actually regulated?" — a check every fintech, insurance company, and compliance team runs regularly. The opportunity The FCA register has a free official REST API at register.fca.org.uk/Developer . No paid tier, no scraping needed — just register an account, get a key, and start making authenticated requests. Despite this, there was literally no Apify actor for it. The US equivalent — FINRA BrokerCheck — already has two actors with thousands of users. The UK gap was sitting there, unoccupied. The architecture This is one of the simplest actor architectures I've built — no Playwright, no Cheerio, no browser automation. Pure HTTP requests with fetch . The FCA API has a few key endpoints: GET /V0.1/Search?q={query}&type=firm — search for firms by name or keyword, returns FRNs GET /V0.1/Firm/{FRN} — fetch base details for a specific firm GET /V0.1/Firm/{FRN}/Address — registered address + phone + website GET /V0.1/Firm/{FRN}/Names — trading names and historical names GET /V0.1/Firm/{FRN}/Permissions — the full list of FCA-regulated activities All endpoints require X-Auth-Email and X-Auth-Key headers. The rate limit is ~100 requests per 60 seconds, which works out to about 25 fully-enriched firms per minute at 4 API calls each. async function fcaFetch < T > ( p

When a team hits a ceiling with their coding agent, the first instinct is to reach for a better model. The reasoning feels obvious: the model is the part that produces the code, the code is the part that is wrong, therefore a smarter model will produce more correct code. Wait for the next release. Switch providers. Bump the tier. This is sometimes right. It is much more often wrong, and the cost of being wrong about it is that you spend months waiting for a model upgrade to solve a problem the model was never the cause of. The harness is the cause of the problem more often than the model. Most teams discover this only after they have exhausted the model-upgrade reflex and finally turn to look at everything else. What a model upgrade actually buys you Newer, stronger models do tangibly improve some things. They handle longer contexts more reliably. They make fewer simple reasoning errors on complex tasks. They follow nuanced instructions more closely. On a fixed prompt, with a fixed task, a better model produces a better answer. What model upgrades do not change: The fact that the agent has no idea your team prefers functional components over class components, because the convention is not in any file the agent reads. The fact that your tests do not actually fail when the code is wrong, so the agent can ship broken code that passes CI. The fact that your codebase has three different ways of handling errors and the agent picks one at random on each PR. The fact that the rule the senior engineer keeps repeating in reviews is not encoded anywhere the next session can see. None of these are fixed by a smarter model. They are fixed by a better harness. A smarter model loaded into the same broken harness will produce slightly more sophisticated versions of the same problems. The diagnostic The diagnostic is one question: when the agent fails, does it fail because it lacked information, or because it lacked capability? A capability failure looks like: the task required reas

How vibecoding is destroying the open source that feeds it March 3, 2026 The snake eating its own tail A year ago, vibecoding was a curiosity. Today, it’s an industry. Millions of developers — or rather prompters — generate entire applications by describing what they want to an LLM. In minutes, an API, a frontend, a deployment. Magical. But behind this magic lies a dirty secret that nobody wants to face: every line of code generated by these AIs was trained on millions of open source projects — projects that are now dying. Vibecoding would be nothing without open source. And it’s killing it. What exactly is vibecoding? For those who spent 2025 in a cave: vibecoding is the practice of creating software in natural language, relying on generative AI models (Claude, GPT-5, Gemini, and the dozens of specialized models that have emerged since). You describe a vibe , an intention, and the AI produces the code. No debugging. No reading documentation. No Stack Overflow. And above all — here’s the crux — no contributing back . The implicit pact of open source is broken The open source ecosystem has always rested on a tacit social contract: I publish my code for free. In return, others use it, find bugs, suggest improvements, contribute. The project lives because a community keeps it alive. This contract had already been severely tested by large corporations that consume open source without contributing proportionally. But at least the developers who used these libraries understood them. They opened issues. They forked. They sent pull requests. They wrote blog posts that spread the word about the project. Vibecoding has blown up this cycle. The vibecoder doesn’t know which library they’re using. They don’t know, and they don’t care. They asked “build me a payment API with webhook handling,” and the AI chose this or that dependency for them. They will never read that project’s README. They will never open an issue. They won’t even know that project exists . The chilling numbers

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