Archives

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

How we built a contract intelligence service that parses, analyzes, and templatizes Portuguese real-estate contracts using Reducto, LangChain, and hexagonal architecture.

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.

How a frustrating apartment search in Portugal turned into Predileto — an AI-powered platform for real estate agencies.

AstroPaper v5: keep the clean look, updates under the hood.

AstroPaper v4: ensuring a smoother and more feature-rich blogging experience.

AstroPaper Version 3: Elevating Your Web Experience with Astro v3 and Seamless View Transitions

AstroPaper with the enhancements of Astro v2. Type-safe markdown contents, bug fixes and better dev experience etc.