Jason Marcell

AI-native systems engineer

Senior backend and platform engineer focused on LLM applications, ML systems, distributed systems, and developer tooling.

Austin, TX • jasonmarcell@gmail.com • LinkedIn • GitHub
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Experience

Amazon

Amazon

Software Engineer · Austin, TX

01/2024 - Present
  • Built an award-winning hackathon POC for enterprise procurement classification that was immediately funded for production; served as technical lead for a team of engineers and data scientists to evolve from an LLM prototype into a scalable classical ML pipeline on AWS SageMaker, now deployed to production processing millions of records with projected annual savings of roughly half a million dollars.
  • Designed experimental AI-assisted development workflows using coordinated LLM subagents, tmux-orchestrated task graphs, git-worktrees, and ephemeral cloud environments to parallelize engineering workflows; built internal LLM-powered developer tooling integrating codebase context and operational runbooks.
  • Early leader of an AI initiative across a 50+ engineer organization; created a 14-topic agentic AI workshop series, built internal AI agents and developer tooling, and drove adoption of AI-native development workflows across the department.
  • Established a department-wide pattern for auto-generated SDKs from OpenAPI specifications, eliminating thousands of lines of manual integration code and standardizing API integrations across multiple systems.
Capital One

Capital One

Lead Software Engineer · McLean, VA (Remote)

11/2022 - 01/2024
  • Led a team building a modular ETL platform for large-scale financial forecasting on a fully serverless AWS stack (DynamoDB, Lambda, React).
  • Developed open-source Jira CLI and inner-source Feature Toggle CLI adopted company-wide.
Twilio

Twilio

Staff Software Engineer · San Francisco, CA (Remote)

09/2021 - 11/2022
  • Led a team of eight engineers building Twilio's Lookup API, an industry-leading consumer trust and phone identity platform.
Lucid, LLC

Lucid, LLC

Staff Software Engineer · New Orleans, LA

05/2018 - 09/2021
  • Led engineering of new microservices in Python and Golang on AWS, contributing to the first billion-dollar startup acquisition in Louisiana.
Apple, Inc.

Apple, Inc.

Software Engineer · Cupertino, CA

10/2011 - 05/2018
  • Safari and WebKit Operations — built CI/CD infrastructure, testing, and deployment tooling for Apple's browser engine across iPhone and Mac.
  • Hardware Reliability Engineering — wrote software for automated hardware stress testing and large-scale data analysis that directly informed product development from prototype through launch.