Juan Mujica

• Designed and built Umbral, an iOS/Android mobile app with an LLM-based interpretation engine, on a hexagonal architecture.
• Implemented RAG with semantic search and document memory over Supabase and pgvector: contextual chat and symbolic analysis.
• Built an AI quality evaluation gate using embedding similarity that breaks the build when quality drops below threshold.
• Added AI security: guardrails, fail-closed moderation, privacy by default and anonymization.
• Automated Google Ads campaigns with Node.js and OpenAI for bid optimization and reporting, integrated into an existing codebase.

TypeScript · Node.js · Fastify · OpenAI · Supabase · pgvector · Qdrant · React Native · Docker

• Contributed to the migration of a monolithic system to microservices for a global client.
• Led requirements analysis, design and definition of the microservices architecture.
• Developed end-to-end full stack solutions with automated testing and continuous deployment.

Java · Spring Boot · Kotlin · Node.js · NestJS · Angular · PostgreSQL · MongoDB · Kafka · AWS

• Built full stack logistics solutions with TDD and clean architecture, mentoring junior developers.

Java · Spring Boot · Angular · PostgreSQL · Jenkins

• Built marketing and advertising platforms: scalable backends with TDD and Angular frontends.

Java · Spring · Angular · PostgreSQL · RabbitMQ

• Built web applications in legacy and modern environments, focused on quality through TDD.

Java · JavaScript · jQuery · Smalltalk · Seaside