14 mins read
AWS serverless video on demand workflow
A practical look at a serverless AWS video pipeline that turns private recordings into HLS playback through MediaConvert, S3, Lambda, EventBridge, and CloudFront.
11 mins read
Is Oracle Stock Undervalued?
Oracle trades at a deep discount to its intrinsic value despite high debt and negative free cash flow from AI infrastructure investments
6 mins read
Three projects, one pipeline
How three standalone tools, the Equity Valuation Engine, Equilyze, and Pressroom, turn a stock ticker into a finished article.
12 mins read
Run LangChain with Ollama locally
Build a local LangChain chat project with Ollama, from environment setup to a working terminal conversation loop.
10 mins read
Vault
Equity valuation without the black box
Years of conservative investing led me to build a Python engine for studying company valuations with visible assumptions, model checks, and limits.
11 mins read
Vault
Building a price tracker that expects failure
One missed bargain became MLScraper, a Python service that watches four stores, preserves price history, and treats unreliable pages with care.
6 mins read
Vault
Building albertoduran.com
A personal site built after a layoff grew into an Astro portfolio and publishing platform with an inspectable static-first system.
16 mins read
Automating cloud processor benchmarks with SiliconBoutique
A unified benchmarking pipeline that deploys Online Boutique locally, on GCP, and on AWS, collects metrics, persists cloud history to BigQuery, and serves results in Grafana and a portable HTML dashboard.
30 mins read
Designing an AI ops agent from the ground up
A spec-driven blueprint for building infrastructure intelligence with LangGraph, Prometheus, and Claude Sonnet. Learn how seven markdown files become a working AI agent.
21 mins read
From zero to live GCP benchmarks with SiliconBoutique
A complete walkthrough for setting up a Google Cloud account, configuring GitHub Actions OIDC auth, and running your first automated benchmark with SiliconBoutique.
5 mins read
My First publication!
The story behind my website and what you can expect to find here.
9 mins read
Vault
A writer's platform
An academic writing platform introduced me to software architecture and placed second among 40 projects after I built it on my own.
10 mins readIn Equity valuation without the black box
Assumptions, scenarios, and honest uncertainty
Learn how historical signals, configured limits, and scenario policy become Bear, Base, and Bull paths without pretending to predict.
11 mins readIn Equity valuation without the black box
How to choose a valuation model
Match DCF, multiples, dividends, assets, and reverse DCF to the financial shape of a business before trusting any estimate.
11 mins readIn Equity valuation without the black box
DCF and reverse DCF, step by step
Build a discounted cash-flow valuation, inspect its sensitivity, and reverse the calculation to understand market-implied expectations.
10 mins readIn Equity valuation without the black box
Extending the engine without breaking its contract
Trace the architecture behind data fields, diagnostics, suitability, valuation managers, CLI output, JSON, and tests before adding features.
11 mins readIn Equity valuation without the black box
Your first valuation run
Install the equity valuation engine, run one ticker, and learn to read suitability checks, scenarios, skipped models, and JSON.
11 mins readIn Equity valuation without the black box
Six other ways to value a company
Compare P/E, EV/EBITDA, P/S, ROE, DDM, and NAV through independent examples, and learn why every model needs its own guardrails.
11 mins readIn Equity valuation without the black box
How to read a valuation result
Interpret scenario rows, skipped models, the equal-weight composite, model dispersion, and JSON without turning output into a target price.
10 mins readIn Equity valuation without the black box
From market data to usable metrics
Follow provider data into StockMetrics, learn what missing-value diagnostics preserve, and see which gaps can still mislead a model.
12 mins readIn Building a price tracker that expects failure
Your first MLScraper price watch
Follow one illustrative Amazon Mexico watch from YAML and URL preview to saved product history, runtime health, and a later price alert.
5 mins readIn Building albertoduran.com
ECharts in MDX publications
Why the journal has a static-first ECharts path for data visuals, how it differs from Mermaid, and how the section is organized.
10 mins readIn Building albertoduran.com
Chart examples for journal authors
A published ECharts example page showing common, dense, hierarchical, flow, distribution, and finance chart options in MDX.
7 mins readIn Building albertoduran.com
How ECharts renders in the build
One option object becomes an accessible static SVG, an optional file asset, or a chart that hydrates only when the article requests it.
10 mins readIn Building a price tracker that expects failure
When a store blocks the scraper
Learn how MLScraper chooses HTTP or browser fetching, protects history after incomplete pages, and slows the right scope after failures.
11 mins readIn Building a price tracker that expects failure
How a YAML job becomes a store URL
Learn how MLScraper turns stable job identity and provider options into validated store routes, predictable storage paths, and safe previews.
10 mins readIn Building a price tracker that expects failure
Operating MLScraper and adding a store
Run MLScraper locally, diagnose health and saved state, exercise its offline tests, and extend the provider contract without runtime leaks.
10 mins readIn Building a price tracker that expects failure
How a product becomes price history
Follow one stable product identifier through updates, temporary absence, recovery, JSON persistence, and MLScraper price-drop alerts.
10 mins readIn Building a price tracker that expects failure
Why every store needs its own adapter
Compare four ecommerce page formats and learn how MLScraper isolates store-specific URLs and parsing behind one product contract.
11 mins readIn Building a price tracker that expects failure
What happens during one scrape cycle
See how FastAPI starts MLScraper, provider loops share concurrency safely, and health turns background work into observable state.
8 mins readIn Building albertoduran.com
Design system map
A map of the site's visual system across Tailwind tokens, DaisyUI themes, CSS partials, SVG icons, parallax, and UI rules.
9 mins readIn Building albertoduran.com
The CSS architecture
One ordered CSS manifest makes the cascade inspectable across Tailwind, DaisyUI, project tokens, shared components, and page rules.
8 mins readIn Building albertoduran.com
DaisyUI 5 themes with OKLCH and Tailwind v4
A semantic color token travels from DaisyUI's OKLCH themes through Tailwind utilities, component surfaces, and Mermaid palettes.
8 mins readIn Building albertoduran.com
Parallax with CSS scroll timelines
The Atlas hero keeps its content in Astro markup while CSS owns depth, narrow viewport cropping, and reduced motion behavior.
8 mins readIn Building albertoduran.com
SVG icons without a library
Three SVG paths cover typed controls, file-loaded skill marks, and generated ribbons, each with a different trust boundary.
8 mins readIn Building albertoduran.com
UI implementation rules
A concise contributor guide for building UI with semantic tokens, consistent spacing, responsive rules, and accessible overlays.
9 mins readIn Building albertoduran.com
Foundation map
A short guide to the repository shape, local development environment, and Cloudflare deployment target behind albertoduran.com.
5 mins readIn Building albertoduran.com
Static deployment on Cloudflare Workers Static Assets
The deployment artifact is a file graph served by Cloudflare Workers Static Assets, with explicit 404 and generated asset behavior.
9 mins readIn Building albertoduran.com
The development environment
The devcontainer standardizes Node 22 and editor tooling while leaving dependency replay, network access, and production checks explicit.
9 mins readIn Building albertoduran.com
The repository architecture
One publication change crosses content, manifest, route, layout, runtime, and style boundaries that keep the repository understandable.
9 mins readIn Building albertoduran.com
Why the site has a custom Mermaid integration
Why Mermaid diagrams render at build time through a custom Astro integration, external browser service, and static SVG assets.
7 mins readIn Building albertoduran.com
Standalone assets and release guardrails
One diagram produces themed SVG files and runtime metadata tied to a renderer version.
5 mins readIn Building albertoduran.com
The external Mermaid renderer contract
The repository defines a batch renderer contract but cannot verify the external Worker's source, deployment, fonts, or production telemetry.
8 mins readIn Building albertoduran.com
Batch pipeline, disk cache, and remote cache
Publishable Markdown files prepare diagrams with one build-scoped coordinator that handles cache lookup, batch rendering, and asset emission.
8 mins readIn Building albertoduran.com
Cloudflare Worker and mermaid.ink
Provider selection contains build failures across an external batch Worker, a public mermaid.ink fallback, and deterministic fixtures.
8 mins readIn Building albertoduran.com
Generating Mermaid themes from DaisyUI palettes
Serializable Mermaid variables carry the site's semantic palettes across a renderer boundary without claiming unmeasured contrast.
8 mins readIn Building albertoduran.com
Merging multi-theme SVGs with HAST
An SVG compiler pass removes scripts, cleans selected styles, rewrites IDs, scopes CSS, and merges light and dark renderer output.
9 mins readIn Building albertoduran.com
Performance map
The site moves work into the build, but its current evidence covers artifacts and behavior rather than Web Vitals or navigation timing.
10 mins readIn Building albertoduran.com
Build-time file optimization
A deterministic build shows what each optimizer changes and exposes the JavaScript chunk warning that still needs a measured budget.
9 mins readIn Building albertoduran.com
Images and fonts
Images and fonts receive different loading treatment according to their role, with explicit priorities and an honest measurement gap.
8 mins readIn Building albertoduran.com
Responsive navigation without timing claims
Static links gain prefetching, document swaps, and theme lifecycle hooks, though the repository has no navigation timing baseline yet.
9 mins readIn Building albertoduran.com
Inside the publication system
The publication system behaves like a compiler whose policy stages turn MDX candidates into routes, navigation, and complete article pages.
11 mins readIn Building albertoduran.com
Code blocks with Shiki and DaisyUI
A fenced sample becomes dual-theme Shiki HTML, a line-numbered component, and markup protected from the production minifier.
11 mins readIn Building albertoduran.com
Content collections and schema rules
The active Zod schema accepts less metadata than the MDX files carry, exposing fields that are unsupported, unused, or only partly wired.
11 mins readIn Building albertoduran.com
Drafts, vault rules, and read time
A typed manifest turns a fixture tree into publication policy for vault ownership, ordering, read time, inherited images, and pagination.
10 mins readIn Building albertoduran.com
The MDX rendering pipeline
Plain MDX syntax and explicit component imports follow different paths into the article's headings, tables, code, diagrams, and charts.
10 mins readIn Building albertoduran.com
Static page generation and navigation
One published entry travels through static path generation and a thin catch-all route into a complete desktop and mobile article shell.
9 mins readIn Building albertoduran.com
Quality map
The quality system matches evidence to risk while naming its missing lint, coverage threshold, cross-browser, and accessibility gates.
9 mins readIn Building albertoduran.com
Chromium preview and tested accessibility behaviors
Chromium tests verify selected reader behaviors while leaving Axe rules, screen readers, reduced motion, Firefox, and WebKit uncovered.
9 mins readIn Building albertoduran.com
Testing the risky build-time systems
Focused regression stories show how unit tests catch draft leaks, SVG ID collisions, unsafe chart options, and damaged generated markup.
9 mins readIn Building albertoduran.com
The testing strategy
Diagnostics, unit tests, a deterministic build, and Chromium preview checks each cover a different failure class in the CI sequence.
8 mins readIn Building albertoduran.com
Runtime enhancement map
Browser modules own preference, viewport, focus, scroll, and local time while the static build remains responsible for readable content.
9 mins readIn Building albertoduran.com
Live data at build time
An unstable ESPN page feeds build-time Atlas data, deterministic fixtures protect tests, and the browser localizes the rendered match time.
6 mins readIn Building albertoduran.com
Diagram expansion and theme-specific asset links
An already-rendered diagram gains theme-aware asset links and disposable popover expansion without shipping Mermaid to the browser.
8 mins readIn Building albertoduran.com
Scroll-based article navigation
A heading list becomes reliable scroll navigation only after accounting for sticky offsets, page edges, clicks, and route cleanup.
8 mins readIn Building albertoduran.com
OverlayPanel, focus, and scroll lock
A checkbox-based overlay provides the static baseline, then browser code adds focus control, Escape handling, and scroll containment.
8 mins readIn Building albertoduran.com
Theme management and view transitions
Theme correctness has three deadlines around first paint, user choice, and Astro route swaps, each owned by a different layer.
11 mins readIn A writer's platform
Engineering the Sin Pluma React frontend
A detailed look at how Sin Pluma's React SPA is structured: Redux state, HOC-based auth guards, Axios interceptors, Slate.js rich text editor, and backend service integration patterns.
8 mins readIn A writer's platform
How Sin Pluma's architecture fits together
A detailed walkthrough of every service in the Sin Pluma system, how Docker networks isolate them, the data flows behind key operations, and the architectural strengths and constraints.
10 mins readIn A writer's platform
Designing the Sin Pluma Flask REST API
How Sin Pluma's Flask API is structured: the app factory pattern, blueprint organization, full endpoint inventory, Marshmallow validation, and integrations with MySQL, Redis, and MinIO.
10 mins readIn A writer's platform
High availability with MySQL InnoDB Cluster in Sin Pluma
How Sin Pluma bootstraps a three-node MySQL InnoDB Cluster, handles automatic failover, manages the schema, and what production hardening looks like beyond the demo environment.
10 mins readIn A writer's platform
JWT in practice: access, refresh, and revocation in Sin Pluma
A detailed walkthrough of Sin Pluma's JWT implementation: token structure, full lifecycle, the Redis blacklist, the Axios refresh queue, storage trade-offs, and security best practices.