# Sebastian Ortiz

> Staff Software Engineer at Walmart Media Group

Location: San Francisco, California, United States
Profile: https://flows.cv/sebastianortiz

Currently a backend developer helping build a large scale ad platform leveraging genAI and agentic workflows, but I've worked on a variety of software and hardware projects ranging from handmade wireless scales and custom keyboards to fiber optic transceivers.

## Work Experience
### Staff Software Engineer @ Walmart
Jan 2019 – Present | San Mateo, California, United States
Large scale genAI system development- agentic workflows using langgraph, langchain, and other frameworks in conjunction with MCP servers for various resources. Observability for such systems using a variety of telemetry tools.

### senior backend developer @ Kiip
Jan 2016 – Jan 2019 | San Francisco Bay Area
Individual contributor on a small team building a high throughput ad network. Automating deployment using Docker and ansible. Tuning Rabbitmq for high performance. Enhancing microservices written in python, and go. Optimizing access to data in AWS Redshift, cassandra, scylladb, postgres, timescaledb, kairosdb. Building OLAP flows with Kafka and Druid. Enhancing system observability with distributed tracing- initially with zipkin and now with jaeger. Ensuring ad campaign deliverability by lowering end to end latency.

### Consultant @ Calculation Consulting
Jan 2014 – Jan 2017
Projects that mix signal processing and machine learning. Experience with pandas, scikit-learn,numpy, libsvm, matlab. Infrastructure work including setting up distributed crawlers to gather training data, exposing models via endpoints for client use.

### web developer @ LUMO BodyTech, Inc
Jan 2013 – Jan 2016 | Palo Alto,CA
Backend web development, primarily in python using flask as well as occasional bits of php. Platforms in use include Heroku and AWS(EC2,S3,Redshift, DynamoDB). Datastore experience: postgres, mongo, redis. Ecommerce platforms experience: woocommerce, shopify.

### Member of technical staff @ Applied Signal Technology
Jan 2006 – Jan 2012
Speech data analysis in python. Optical signal modeling with Matlab and RSoft. System performance tests with awk, expect, python, and TCL. Digital receiver design including DSP development in Matlab and C implementation on TI C64x. Board bring-up and test.

### Field Applications Engineer @ Agilent/Avago Technologies
Jan 2005 – Jan 2006
Support of customer design-in for CMOS image sensors and fiber optic transceivers. QA test development for RF power amplifiers and FBAR filters. Technical presentations for iSuppli and EETimes. FCC EMI compliance testing and corrective design proposals.


## Education
### BS EECS
Massachusetts Institute of Technology

### MEng in Electrical and Computer Engineering
Cornell University


## Contact & Social
- LinkedIn: https://linkedin.com/in/sebortiz
- Portfolio: http://www.sebortiz.com
- Portfolio: http://www.keyboardmods.com

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Source: https://flows.cv/sebastianortiz
JSON Resume: https://flows.cv/sebastianortiz/resume.json
Last updated: 2026-04-12