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Jacar categories — explore the topics A rocket whose eyes follow your cursor.
Startup

NIS2 in Spain: a technical translation of 2026 obligations

The Spanish draft law transposing NIS2 is still in parliament in 2026, but the directive's technical obligations have applied since October 2024. Practical map: the ten minimum security measures, the 24-hour, 72-hour and one-month incident notification window, and the new supply-chain security obligations.

Architecture

Kubernetes 1.35 GA: an operations-side balance sheet

Kubernetes 1.35 GA consolidates three releases of work: native sidecars with full lifecycle management, generalised DRA for FPGAs and NPUs, and a scheduler that cuts resource waste by 15-25% in heterogeneous clusters. An operations-side balance sheet: what to enable now, what to watch before migrating, and what path to follow from 1.30.

Technology

NVIDIA alternatives in 2026: where the market is heading

NVIDIA still dominates frontier-model training in 2026, but inference tells a different story. AMD MI300X/MI325X with mature ROCm, Intel Gaudi 3, Google TPU v6, and AWS Trainium/Inferentia deliver 20 to 50% lower cost per token without sacrificing quality. Here is when to choose each option.

Startup

Startup Funding in 2023: Reality After the Correction

After the 2021 historic peak and the 2022 correction, startup funding in 2023 has been redefined: Series A rounds dropping from $15M to $8-10M, due diligence extending to 14 weeks, and metrics like the real Rule of 40 and NRR above 110% as the new minimum.

Architecture

Docker Swarm in 2023: When It Still Makes Sense

Kubernetes won the orchestration battle, but Docker Swarm stays maintained inside Docker Engine and makes real sense for small teams without dedicated SRE, self-hosted stacks on 1-5 VPS, and edge mini-clusters. In those contexts, Swarm's minimal learning curve and low operational cost outweigh Kubernetes's advanced features.

Industry 4.0

Humanoid robotics: beyond the viral videos

Humanoid robotics left the trade-show floor for factory floors and warehouses during 2025 and 2026. Which companies have really deployed units, which tasks fit, what real costs look like, and where humans remain unbeatable.

Technology

Next-generation NPUs: the hardware moving AI in 2026

NPUs stopped being an accessory and became the component that defines real performance in laptops, phones, and small servers. A practical look at the hardware that rules 2026, which workloads pay off, and where the traditional GPU still wins.

Technology

Quantum computing: real progress without hype

After a decade of grandiose headlines, quantum computing enters this cycle with more honest metrics, thousand-physical-qubit machines, and the first serious signs of error correction at scale. It pays to separate what already works from what remains research.

Technology

Fly.io: deploying globally without complicating your life

Fly.io has spent years selling the idea that deploying an application across several regions should be almost as simple as pushing an image and writing one config line. After several real projects on the platform, here is an honest read on what it delivers, what is missing, and who it is worth choosing over more classic options.

Technology

Microsoft Garnet: a high-performance cache alternative

Garnet es el servidor de caché abierto por Microsoft Research que habla el protocolo de Redis pero está escrito en .NET 8 con un núcleo de almacenamiento orientado a hardware moderno. Tras casi dos años en público, muestra números interesantes y una arquitectura que merece mirarse con calma, aunque el ecosistema Redis siga siendo más maduro.

Architecture

Citus: scaling Postgres horizontally without leaving it

Tras la adquisición por Microsoft en 2019, Citus vivió un limbo comercial que terminó con Microsoft abriendo el código completo en 2022. Tres años después, la extensión de particionado para Postgres ha madurado y ofrece una ruta práctica para escalar sin abandonar el motor que ya conoces. Un repaso honesto.

Technology

OSV-Scanner: vulnerabilities with a source of truth

OSV-Scanner se ha convertido en una referencia silenciosa para escanear dependencias open source. Su valor no está en el escaneo en sí, que muchas herramientas ofrecen, sino en su conexión directa con OSV.dev como fuente de verdad. Un análisis de por qué esto importa más de lo que parece.

Technology

Unikraft and unikernels: the promise that returns

Unikernels were promised as the future of cloud deployment back in 2015, then faded into obscurity soon after. Ten years later, Unikraft has reached a stable release and reads like a more mature, more useful take on that same idea. A review of what has changed.

Architecture

Kubernetes 1.34: a summary for teams with little time

Kubernetes 1.34 ships with Dynamic Resource Allocation (DRA) graduating to stable, scheduler improvements, and CEL-based mutating admission policies that replace webhooks. A practical rundown of what is safe to upgrade now, what can wait, and what actually changes for teams running production clusters.

Architecture

containerd 2.0 in production: real migrations

Six months after containerd 2.0 reached general availability there is enough real-world mileage to judge the migration from the 1.x branch in production. We cover what changes in the config file, what breaks on Kubernetes and Docker Swarm, and when planning the jump actually pays off.

Technology

Headscale: the free alternative to Tailscale

Headscale es una reimplementación libre del plano de control de Tailscale. Con la versión 0.25 estable, es una opción sensata para mallas WireGuard privadas sin depender de la plataforma comercial. Cuento cómo, cuándo y dónde duele.

Technology

Deno 2.0: Node compatibility without losing identity

Deno 2.0 salió en octubre de 2024 con una apuesta clara: compatibilidad seria con npm, pnpm, package.json y node_modules, manteniendo la identidad del runtime. Medio año después, miramos qué ha supuesto para proyectos reales y dónde sigue cojeando.