# Celestino Salim

> Author: Celestino Salim
> Site: https://celestinosalim.com
> Updated: 2026-02-27
> Languages: en, es
> Content-License: All rights reserved
> Spanish content available at /es/* (e.g. /es/blog, /es/services, /es/about)

Senior Software Engineer building hardened AI systems engineered for reliability, unit economics, and scale. Personal brand hub with blog, courses, services, and project portfolio.

## About

- [About](https://celestinosalim.com/about): Background, experience, and what I build — AI systems that survive production. Type: ProfilePage | Author: Celestino Salim

## Blog

- [Evals Are Unit Tests](https://celestinosalim.com/blog/evals-are-unit-tests): Why LLM evaluations are the missing testing layer for AI products. Type: BlogPosting | Author: Celestino Salim
- [RAG Is Bleeding Money](https://celestinosalim.com/blog/rag-bleeding-money): Cost analysis and optimization strategies for retrieval-augmented generation. Type: BlogPosting | Author: Celestino Salim
- [Systems Thinking for AI Engineers](https://celestinosalim.com/blog/systems-thinking-ai-engineers): Applying systems thinking to AI engineering problems. Type: BlogPosting | Author: Celestino Salim
- [Vendor Off-Ramp](https://celestinosalim.com/blog/vendor-off-ramp-60k): How to save $60K+ by planning your AI vendor exit strategy. Type: BlogPosting | Author: Celestino Salim
- [Voice Interfaces That Feel Instant](https://celestinosalim.com/blog/voice-interfaces-feel-instant): Engineering low-latency voice experiences with streaming and WebRTC. Type: BlogPosting | Author: Celestino Salim
- [Hello World](https://celestinosalim.com/blog/hello-world): Introductory post on the blog. Type: BlogPosting | Author: Celestino Salim

## Courses

- [What AI Actually Is](https://celestinosalim.com/learn/courses/what-ai-actually-is): Foundations — demystifying AI beyond the hype. Prediction vs. magic, adoption levels, economics. Type: Course | Level: Beginner | Author: Celestino Salim
- [Building Your First AI Product](https://celestinosalim.com/learn/courses/building-your-first-ai-product): Hands-on — first LLM API call through deployment on Vercel with AI SDK. Type: Course | Level: Beginner | Author: Celestino Salim
- [Prompt Engineering That Works](https://celestinosalim.com/learn/courses/prompt-engineering-that-works): Practical prompt design — chain-of-thought, role prompting, systematizing prompts. Type: Course | Level: Intermediate | Author: Celestino Salim
- [RAG Systems in Production](https://celestinosalim.com/learn/courses/rag-systems-production): Deep dive — chunking, embeddings, retrieval tuning, cost optimization for RAG. Type: Course | Level: Intermediate | Author: Celestino Salim
- [AI Evaluation & Reliability](https://celestinosalim.com/learn/courses/ai-evaluation-reliability): Testing AI — eval metrics, reliability flywheel, regression testing for LLMs. Type: Course | Level: Intermediate | Author: Celestino Salim
- [Production AI Architecture](https://celestinosalim.com/learn/courses/production-ai-architecture): Architecture — streaming, caching, observability, multi-model orchestration. Type: Course | Level: Advanced | Author: Celestino Salim
- [Voice Chat Agents](https://celestinosalim.com/learn/courses/voice-chat-agents): Build voice AI — LiveKit, real-time audio, turn-taking, production deployment. Type: Course | Level: Advanced | Author: Celestino Salim
- [AI Strategy for Business](https://celestinosalim.com/learn/courses/ai-strategy-for-business): Strategy — opportunity audits, build vs. buy, ROI calculation, team building. Type: Course | Level: Intermediate | Author: Celestino Salim

## Services

- [AI Consulting](https://celestinosalim.com/services/ai-consulting): End-to-end AI system design and implementation for businesses. Type: Service | Author: Celestino Salim
- [AI Audit](https://celestinosalim.com/services/audit): Technical audit of existing AI systems for reliability and cost. Type: Service | Author: Celestino Salim
- [Clinic Automation](https://celestinosalim.com/services/clinic-automation): AI-powered scheduling, intake, and workflow automation for clinics. Type: Service | Author: Celestino Salim
- [Content Infrastructure](https://celestinosalim.com/services/content-infrastructure): Scalable content pipelines with CMS, MDX, and AI-assisted workflows. Type: Service | Author: Celestino Salim
- [Legal Automation](https://celestinosalim.com/services/legal-automation): Document analysis, contract review, and compliance automation. Type: Service | Author: Celestino Salim
- [Real Estate AI](https://celestinosalim.com/services/real-estate-ai): Lead scoring, property matching, and market analysis with AI. Type: Service | Author: Celestino Salim
- [Retail AI](https://celestinosalim.com/services/retail-ai): Inventory optimization, demand forecasting, and customer insights. Type: Service | Author: Celestino Salim

## Projects

- [Lab: Evals & RAG](https://celestinosalim.com/work/lab-evals-and-rag): Evaluation framework and RAG pipeline experiments. Type: TechArticle | Author: Celestino Salim
- [Lab: Manito Carwash](https://celestinosalim.com/work/lab-manito-carwash): AI-powered operations for a car wash business. Type: TechArticle | Author: Celestino Salim
- [Lab: Vendor Off-Ramp](https://celestinosalim.com/work/lab-vendor-off-ramp): Open-source tool for AI vendor migration planning. Type: TechArticle | Author: Celestino Salim
- [Lab: Voice Agent](https://celestinosalim.com/work/lab-voice-agent): Real-time voice AI agent built with LiveKit and AI SDK. Type: TechArticle | Author: Celestino Salim

## Learning Hub

- [Learn](https://celestinosalim.com/learn): Free AI education — courses, articles, and resources for engineers and business leaders.
- [Learning Roadmap](https://celestinosalim.com/learn/roadmap): Structured learning path from AI foundations to production systems.

## Optional

- [FAQ](https://celestinosalim.com/faq): Frequently asked questions about AI consulting and courses. Type: FAQPage | Author: Celestino Salim
- [Contact](https://celestinosalim.com/contact): Get in touch for consulting, partnerships, or questions.
- [Privacy Policy](https://celestinosalim.com/privacy): Privacy policy and data handling practices.
- [Terms of Service](https://celestinosalim.com/terms): Terms of service for the website and courses.
- [Links](https://celestinosalim.com/links): Social profiles and external links.
- [AI Digital Twin](https://celestino.ai): Interactive AI chat — ask questions about my work, experience, and AI systems.
- [Full Content](https://celestinosalim.com/llms-full.txt): Complete aggregated content from all pages in plaintext.