My personal blog.https://astro-paper.pages.dev/https://astro-paper.pages.dev/posts/predileto/scoped-concurrency-in-async-python-workers/https://astro-paper.pages.dev/posts/predileto/scoped-concurrency-in-async-python-workers/How we built a gather_with_concurrency utility to parallelize Google Places API calls inside an SQS worker — and why scoped semaphores are safe in single-loop async architectures.Tue, 31 Mar 2026 11:00:00 GMThttps://astro-paper.pages.dev/posts/predileto/domain-events-and-commands-in-async-python/https://astro-paper.pages.dev/posts/predileto/domain-events-and-commands-in-async-python/How we designed a unified domain events bus alongside dedicated command queues in our Python backend — the architecture, the code, every design decision, and the trade-offs of event-driven async systems.Tue, 31 Mar 2026 10:30:00 GMThttps://astro-paper.pages.dev/posts/predileto/implementing-unit-of-work-in-async-python/https://astro-paper.pages.dev/posts/predileto/implementing-unit-of-work-in-async-python/How we implemented the Unit of Work pattern with async SQLAlchemy to fix transaction inconsistencies across three bounded contexts — from the problem discovery to the final implementation with code walkthroughs.Tue, 31 Mar 2026 10:00:00 GMThttps://astro-paper.pages.dev/posts/predileto/async-concurrency-patterns-for-io-bound-python/https://astro-paper.pages.dev/posts/predileto/async-concurrency-patterns-for-io-bound-python/How we went from sequential awaits to controlled concurrency in our Python AI pipelines — covering asyncio internals, semaphore-based throttling, Celery thread pools, LangChain thread safety, and the tradeoffs that matter when your bottleneck is API latency.Sat, 28 Mar 2026 14:00:00 GMThttps://astro-paper.pages.dev/posts/predileto/ddd-and-hexagonal-architecture-in-python/https://astro-paper.pages.dev/posts/predileto/ddd-and-hexagonal-architecture-in-python/A walkthrough of how Estate OS Service implements Domain-Driven Design with hexagonal architecture in Python — bounded contexts, ports and adapters, typed domain events, and the trade-offs that shaped the design.Sat, 28 Mar 2026 10:00:00 GMThttps://astro-paper.pages.dev/posts/predileto/building-the-property-search-portal/https://astro-paper.pages.dev/posts/predileto/building-the-property-search-portal/How we built a property search portal with Next.js 16, hybrid rendering, URL-driven state, hierarchical location filtering, and comprehensive test coverage using Cypress and Jest.Thu, 26 Mar 2026 10:00:00 GMThttps://astro-paper.pages.dev/posts/predileto/building-a-booking-service-in-go/https://astro-paper.pages.dev/posts/predileto/building-a-booking-service-in-go/How we built a property visit booking service in Go with domain-driven design, optimistic locking, OpenAPI code generation, SQS event consumption, and E2E tests using testcontainers.Wed, 25 Mar 2026 20:00:00 GMThttps://astro-paper.pages.dev/posts/predileto/why-we-chose-service-based-architecture/https://astro-paper.pages.dev/posts/predileto/why-we-chose-service-based-architecture/Why Predileto uses service-based architecture instead of microservices or a monolith — and how iterative domain discovery through customer interviews naturally shaped the system topology.Wed, 25 Mar 2026 19:00:00 GMThttps://astro-paper.pages.dev/posts/predileto/how-to-screen-rental-applicants-with-ai/https://astro-paper.pages.dev/posts/predileto/how-to-screen-rental-applicants-with-ai/How we built an applicant screening pipeline that extracts identity and income data from uploaded documents, verifies them against applicant claims, and produces a risk-scored report using LangGraph and GPT-5.4.Wed, 25 Mar 2026 18:00:00 GMThttps://astro-paper.pages.dev/posts/predileto/testing-async-python-services-with-localstack/https://astro-paper.pages.dev/posts/predileto/testing-async-python-services-with-localstack/How we test a FastAPI applicant screening service end-to-end using in-memory SQLite, AsyncMock for S3/SQS, and dependency injection overrides — without spinning up Docker containers.Wed, 25 Mar 2026 14:00:00 GMThttps://astro-paper.pages.dev/posts/predileto/how-to-generate-contracts-with-rag/https://astro-paper.pages.dev/posts/predileto/how-to-generate-contracts-with-rag/How we built a contract intelligence service that parses, analyzes, and templatizes Portuguese real-estate contracts using Reducto, LangChain, and hexagonal architecture.Wed, 25 Mar 2026 10:00:00 GMThttps://astro-paper.pages.dev/posts/predileto/how-to-extract-property-data-from-documents/https://astro-paper.pages.dev/posts/predileto/how-to-extract-property-data-from-documents/How we built a property ingestion pipeline that extracts property and owner data from uploaded documents using Reducto OCR, GPT-5.4 structured output, and document-type-aware prompts.Tue, 24 Mar 2026 04:59:04 GMThttps://astro-paper.pages.dev/posts/predileto/first-commit/https://astro-paper.pages.dev/posts/predileto/first-commit/How a frustrating apartment search in Portugal turned into Predileto — an AI-powered platform for real estate agencies.Wed, 25 Mar 2026 10:00:00 GMThttps://astro-paper.pages.dev/posts/astro-paper-v5/https://astro-paper.pages.dev/posts/astro-paper-v5/AstroPaper v5: keep the clean look, updates under the hood.Sat, 08 Mar 2025 08:18:19 GMThttps://astro-paper.pages.dev/posts/astro-paper-v4/https://astro-paper.pages.dev/posts/astro-paper-v4/AstroPaper v4: ensuring a smoother and more feature-rich blogging experience.Thu, 04 Jan 2024 09:30:41 GMThttps://astro-paper.pages.dev/posts/astro-paper-v3/https://astro-paper.pages.dev/posts/astro-paper-v3/AstroPaper Version 3: Elevating Your Web Experience with Astro v3 and Seamless View TransitionsMon, 25 Sep 2023 10:25:54 GMThttps://astro-paper.pages.dev/posts/astro-paper-2/https://astro-paper.pages.dev/posts/astro-paper-2/AstroPaper with the enhancements of Astro v2. Type-safe markdown contents, bug fixes and better dev experience etc.Mon, 30 Jan 2023 15:57:52 GMT