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Deep-Dives in Cloud, Kubernetes, Security & Architecture

Field notes from running Google Cloud in production at enterprise scale — Kubernetes, cloud security, DevSecOps, system architecture and AI infrastructure. Written for engineers who ship, not for slide decks. A new article every weekday, in English and German.

Articles: 100
Topics: 8
Languages: EN · DE

Aleksei AleinikovSenior Cloud Platform & Security Engineer

Google Cloud Ambassador
5× GCP Professional
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Google reCAPTCHA Explained: v2 vs v3 vs Enterprise, Pricing, Scores and Every Key Type

Featured

Security

Oct 9, 202621 minNewIntermediate

Google reCAPTCHA Explained: v2 vs v3 vs Enterprise, Pricing, Scores and Every Key Type

A complete, practical guide to Google reCAPTCHA as it works today: what v2, v3 and Enterprise mean now, every key type (score, checkbox, policy-based, Universal, Android, iOS, WAF, express), real pricing with worked examples, how the score works, production code for a v3-style integration, mobile apps with Firebase App Check, AI agents and the new QR code challenge, and a fix list for when reCAPTCHA is not working.

Key takeaway"v2", "v3" and "Enterprise" are legacy names. Every reCAPTCHA key now lives in a Google Cloud project, the Classic keys were migrated automatically, and since April 22, 2026 reCAPTCHA is part of Google Cloud Fraud Defense. v3 is now a score-based key, v2 a checkbox key, and Enterprise is the API and the paid tiers, not a third version.

Claude Haiku 5.5 vs Sonnet 5.5 vs Opus 5.5: 20× Cheaper Than Sonnet — and a 100K-Token Price Cliff

Claude Haiku 5.5 vs Sonnet 5.5 vs Opus 5.5 compared on Anthropic's benchmarks, list price and monthly cost for three real workloads, the 100K-token price cliff that only Haiku has, what breaks when you migrate from Haiku 4.5, and how to let Opus plan while Haiku does the work.

shadcn/ui vs MUI vs Mantine: I Built the Same Screen Five Ways and Measured It

Programming

Oct 7, 202613 minNewIntermediate

shadcn/ui vs MUI vs Mantine: I Built the Same Screen Five Ways and Measured It

shadcn/ui vs MUI vs Mantine on a real benchmark: the same React screen built five ways, gzip bundle sizes, npm packages shipped, the code you end up owning, what changed when shadcn made Base UI its default instead of Radix, what MUI 9 and Mantine 9 changed, the traps I hit, and which library to pick.

Oct 6, 202613 minNewIntermediate

GPT-6.1 Sol vs Claude Opus 5.5: Half the Price, a Different Tier — and Where the Gap Disappears

GPT-6.1 Sol vs Claude Opus 5.5 compared on specs, list price and real cost per agent turn: why Sol is OpenAI's middle model and not a flagship, which benchmarks exist, why the 2× price gap shrinks to about 6% past 272K input tokens, and what EU data residency looks like on each.

Cilium vs Calico: Which Kubernetes CNI Should Run Your Production Cluster?

DevOps

Oct 5, 202620 minNewIntermediate

Cilium vs Calico: Which Kubernetes CNI Should Run Your Production Cluster?

Cilium 1.20 and Calico 3.33 shipped within weeks of each other, and the old "eBPF vs iptables" framing no longer describes either. A production comparison: dataplanes, network policy models, observability, encryption, Gateway API, what GKE, EKS and AKS actually run, and the migration traps nobody mentions.

Cloud

Oct 2, 202610 minNewIntermediate

Gemini 4 Argon on Google Cloud: What Actually Changes for Platform Teams (2026)

Gemini 4 Argon launched on 30 September 2026 — but only for vetted cyber defenders. What platform teams on Google Cloud should change now: the 1M-token output budget, Argon vs Gemini 3.8 Flash routing, agent guardrails, and the deadlines that land before Argon does.

Oct 1, 202617 minIntermediate

Agent Skills Explained: SKILL.md, Claude Skills and When to Use Them Instead of MCP

Agent Skills are folders with a SKILL.md file that AI agents load on demand. How the open standard works, what each frontmatter field does, where Claude Code, Copilot and Codex look for skills, how skills differ from MCP, AGENTS.md and subagents, and why every skill you install is part of your software supply chain.

Sep 30, 202615 minIntermediate

WebMCP Explained: How Chrome Turns Your Website Into an MCP Server for AI Agents

WebMCP explained: how the new browser API lets AI agents call a website's JavaScript as MCP-style tools, how Chrome 149 implements registration, discovery and execution, how WebMCP differs from MCP servers, and what I learned shipping five WebMCP tools to production.

Sep 29, 202615 minIntermediate

Claude Sonnet 5.5 vs Opus 5.5: Half the Price, Nearly the Same Scores — and a Routing Trap

Claude Sonnet 5.5 vs Opus 5.5 compared on benchmarks, list price and real cost per agent turn, why the savings disappear at max effort, the five breaking changes from Sonnet 5, and why a Sonnet-Opus router silently drops the model's reasoning on the way back down.

Sep 28, 202614 minIntermediate

Claude Code Modes Compared: Why Plan Mode Died and What Replaced It

All six Claude Code permission modes compared — Manual, acceptEdits, plan, auto, dontAsk and bypassPermissions — what each one lets the agent do, why auto mode replaced plan mode as the default, what the auto-mode classifier blocks and allows, and a settings.json that holds up.

Rogue AI Agents Hacked a Government Site — Nobody Told Them To

Security

Sep 25, 202610 minIntermediate

Rogue AI Agents Hacked a Government Site — Nobody Told Them To

On 23 September 2026, an independent AI-safety lab published forensic evidence that autonomous AI agents hacked into three public data services, including an Australian government site, while doing nothing more than trying to answer an ordinary question. Hours later, OpenAI and Australia's Prime Minister both confirmed it. Here is what the data actually shows, and what it means for anyone running a public API.

Cloud

Sep 24, 202612 minBeginner

AWS vs Google Cloud vs Azure Free Tier: What Is Actually Free, and What Bills You

AWS, Google Cloud and Azure all say free, but they mean three different things: a credit that expires, a monthly allowance that never does, and a clock you did not notice starting. A side-by-side of the sign-up credits, the always-free limits, what happens on the day the credit ends, and the traps that turn a free account into an invoice.

SQLite in Go: Drivers, WAL, Locking and Production Patterns

Programming

Sep 23, 202613 minAdvanced

SQLite in Go: Drivers, WAL, Locking and Production Patterns

SQLite works remarkably well inside a Go service when the connection pool respects its locking model. This guide compares current drivers, measures their actual cost, and builds a production setup around WAL, bounded pools, short transactions, checkpoints, backups and observable failure modes.

Kubernetes 1.35 to 1.38: What Actually Changes in Production

DevOps

Sep 22, 202614 minAdvanced

Kubernetes 1.35 to 1.38: What Actually Changes in Production

Kubernetes 1.35, 1.36 and 1.37 changed far more than their release-note headlines suggest. A production-focused map of security defaults, autoscaling, AI scheduling, storage, control-plane resilience, upgrade traps, and the still-moving 1.38 release.

Sep 21, 202615 minAdvanced

Jev vs GPT-5 and Claude for Classification and Routing

Jev does not try to out-chat GPT-5 or Claude. It removes text generation from a narrower job: making typed, probabilistic decisions inside software. That can be a major architectural advantage — if your task really is a decision.