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© 2026 Cristian Najera

Cristian Najera — data engineer and AI systems builder
cristian najeramexico city — remoteavailable for new work

Engineer, analyst, occasional economist.

I build AI systems, data pipelines, and cloud backends that run in production — not just in demos. Eight years in, I still find the hard problems worth solving.

How I got here

I started in economics — not the kind that wins Nobel prizes, but the applied kind: regression tables, policy analysis, late nights with Stata. What I found, slowly, was that the most interesting questions weren't in the models themselves but in the data underneath. Messy, incomplete, contested data. I wanted to get closer to it.

That pull led me into analytics engineering. I learned SQL deeply, then Python, then what it meant to build a pipeline that survives contact with production. I worked on data infrastructure for e-commerce platforms — Kafka streams, Airflow DAGs, warehouses that actually held up under load. It was unglamorous and I loved it.

The next chapter was machine learning: not the research kind, but the it has to work on Monday morningkind. Lead scoring, demand forecasting, churn prediction. I built feature stores, owned model deployments on SageMaker, and learned the hard way that a model that doesn't ship is just an expensive science fair project.

Now I work at the intersection of AI and production systems. LLMs, multi-agent pipelines, RAG architectures — the field moves fast, but the fundamentals haven't changed: understand the problem, ship something real, measure what matters. I'm still chasing those hard questions, just with better tools.

Experience

2022—now

Independent

SENIOR AI ENGINEER

Consulting on production AI systems, cloud-native backends, and ML infrastructure for startups and scale-ups across LatAm and the US.

2020—22

Scoop AI

ML ENGINEER

Built end-to-end ML pipelines, lead-scoring models, and real-time feature stores deployed on AWS SageMaker and Lambda.

2018—20

Data Studio

DATA ENGINEER

Designed ETL workflows and Kafka-based streaming pipelines processing millions of events per day for e-commerce analytics.

2016—18

UNAM — Economics

RESEARCH ANALYST

Econometric modeling and statistical analysis of public policy outcomes. First encounter with Python as a tool for thought.

Stack

Languages
  • Python
  • TypeScript
  • SQL
  • Bash
Cloud
  • AWS Lambda
  • ECS
  • S3
  • CDK
  • SAM
AI / ML
  • LangChain
  • LangGraph
  • Bedrock
  • SageMaker
  • scikit-learn
Data
  • PostgreSQL
  • DynamoDB
  • Kafka
  • Spark
  • Airflow
DevOps
  • Docker
  • GitHub Actions
  • Terraform
  • OpenTelemetry
Frontend
  • Next.js
  • React
  • Tailwind CSS
  • shadcn/ui

Talks & press

2024Building Production RAG Systems That Don't HallucinateAWS USER GROUP CDMX
2024LangGraph in the Wild: Multi-Agent Orchestration PatternsPYCON LATAM
2023Real-Time Feature Stores at ScaleML SUMMIT CDMX
2023Cost-Aware Serverless: Lessons from ProductionAWS COMMUNITY DAY

Things I don't do

In the spirit of full disclosure.

  • ×Crypto consulting
  • ×Blockchain strategy
  • ×WordPress themes
  • ×"Move fast, break prod"
  • ×Microservices on day one
  • ×"We'll add tests later"
  • ×Perpetual feature flags
  • ×Deck-only engagements

If any of this resonates, I'd like to hear from you.

Whether it's a project, a question, or just a good problem to think through together.

Get in touch