Marcus Valenzuela Full-Stack Engineer

Systems that survive contact with production.

Four years shipping at Fortune 500 scale — 100+ Lambdas, millions of users, every piece of infrastructure written as code. Now wiring AI into the stack where it earns its keep.

Start a project The operating record ↓
Available for projects Arizona, USA ex-USMC Sergeant
4+ years building systems
F500 enterprise scale
100+ lambdas in production
99.9% uptime maintained

No headshot. This is the actual product: small services, queues between them, nothing load-bearing on hope.

Operating record

Shipped, running, and still running.

A portfolio is easy to stage. Production history isn't. This is work from four years inside a Fortune 500 engineering org — systems with real users, real SLAs, and no one to hand the pager to.

  1. Fleet telematics pipeline

    Event-driven ingestion from Samsara telematics across a nationwide fleet. Thirty-four Lambdas, DynamoDB stream triggers, Aurora MySQL at the end of the line.

    34 λ

  2. Oracle EAM bidirectional sync

    Work orders flowing both directions between field systems and Oracle EAM. SQS FIFO for strict ordering — a sync that cannot silently drop a message.

    SQS FIFO

  3. Nationwide feature rollouts

    Feature-flagged releases into an application used by millions, shipped during business hours without downtime.

    millions of users

  4. Real-time operations mapping

    Live vehicle and work-order views on Esri ArcGIS, pushed to the field over AppSync GraphQL subscriptions.

    AppSync · ArcGIS

  5. Twenty-plus microservice repos

    Terraform and Serverless Framework for every environment, CI/CD on GitHub Actions, X-Ray tracing end to end. If it is not in code, it does not exist.

    infra as code
The route here

Trained to hold a line.
Now I ship one.

  1. United States Marine Corps

    Sergeant, squad leader. Fort Huachuca, then a deployment to Iraq. The place where "it has to work" stopped being a figure of speech — and where I learned to own an outcome, not a task.

  2. Fortune 500 engineering

    Full-stack engineer on enterprise fleet systems: the 34-Lambda telematics pipeline, Oracle EAM sync, real-time ops mapping, nationwide rollouts. TypeScript, Angular, and AWS all day, every day.

  3. Independent builds

    Revenue-first sites and AI systems for small teams, built with the same standards as the enterprise work — plus a Computer Science degree in progress at Arizona State.

On the record

The people I've built with say it best.

One of the most driven and resourceful professionals I’ve worked with… His ability to quickly grasp complex technical challenges and deliver practical, secure solutions stood out — especially during high-impact projects like application security enhancements and code reviews.
Jeff Gardner Software Engineer & Architect · Republic Services
Marcus brings a rare combination of deep technical knowledge, natural leadership instincts, and an unshakable work ethic that makes him the kind of engineer every team hopes to have… Any team would be lucky to have him.
Chase Brown Smart Contract Engineer · Former Teammate
Read the full recommendations on LinkedIn →
Get in touch

Let’s build
something real.

I take on a small number of projects at a time. If you have something worth building, I want to hear about it.

mavtheengineer@gmail.com linkedin.com/in/marcusvalenzuela94