Brayan Mercado — Full Stack Software Engineer
I build end-to-end software: interfaces, APIs, architecture, and applied AI.
I develop Full Stack features and backend systems, integrating interfaces, APIs, data, and AI into a single solution.
Services
AI Systems
RAG systems, semantic search, specialized chatbots, and document processing integrated into existing applications.
Backend Development
Backend services, business logic, data modeling, and persistence for digital products.
Full Stack Development
End-to-end features from data models and business logic through APIs and interfaces.
APIs & Integrations
REST APIs and integrations between applications and external services.
Software Architecture
Architecture and structural decisions applied according to the actual needs of the product.
Technical Review
Review of architecture, implementation decisions, and structural problems before more work is built on top of them.
Experience
PLEI — E-Learning Platform and AI Infrastructure
Replaced Algolia with a custom hybrid search engine and built reusable RAG and AI support capabilities for the platform.
Zeus — IoT Platform for Medical Devices
Developed full-stack and backend capabilities for an IoT platform covering device usage, financial reporting, support, and applied AI.
VeciApp — Backend for a Local Marketplace
Designed and built the backend for a multi-role marketplace connecting local merchants with their customers.
Engineering
Replacing Algolia with a Hybrid Search Engine
How Algolia's search in PLEI was replaced with a hybrid engine built on PostgreSQL, pgvector, Full Text Search, and Reciprocal Rank Fusion.
Building a RAG System From Scratch
How a Retrieval-Augmented Generation pipeline is built without a framework and kept swappable at the LLM-provider level.
Products
Pliegos
LiveAI-powered procurement intelligence.
About Me
I didn't start out building software. I started as a food engineer, learning to model processes, control quality, and solve problems with structure and analysis — long before I touched a line of TypeScript.
That changed when I moved into software: first building interfaces, then backend systems, and eventually taking on architecture decisions end to end...
Have a project in development?
Tell me what you're building and we can review where I can contribute.