Chris Zarlengo, Developer in Seattle, WA, United States
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Chris Zarlengo

Verified Expert  in Engineering

Full-stack Developer

Seattle, WA, United States
Toptal Member Since
June 7, 2021

Chris has been developing custom production software for aerospace and industrial manufacturers to support various operations with automated solutions for the organization's needs. His projects include integrating machinery into an internet-of-things (IoT) system for viewing the current status of operations within the factory, developing robotic solutions to automate tasks, and fully digitizing operations removing paper from the floor and allowing data to drive decisions for the factory.


Costco Wholesale
JavaScript, C#, PLC, CSS, HTML, APIs, React, SQL, AngularJS, ASP.NET MVC...
OMAX Corporation
Node.js, JavaScript, AngularJS, CSS, HTML, SQL, MQTT, Node-RED, PLC...
Flow International Corporation
JavaScript, CSS, HTML, Python, MySQL, Microsoft SQL Server, .NET...




Preferred Environment

Windows, MacOS

The most amazing...

...project I developed was a live factory display board showing equipment and process status for employees by networking "dumb" machinery allowing data collection.

Work Experience

Full-stack Engineer

2021 - PRESENT
Costco Wholesale
  • Provided support to manufacturing facilities to implement new features and provide solutions to the technician's changing requirements.
  • Worked in an Agile Scrum team to meet the factory's roadmap plan to provide new features incrementally for their operators.
  • Collaborated with multiple departments to ensure meeting system performance, database administration, and quality testing.
Technologies: JavaScript, C#, PLC, CSS, HTML, APIs, React, SQL, AngularJS, ASP.NET MVC, Oracle, Microsoft SQL Server, SQL Server Reporting Services (SSRS), GitHub, Agile, Agile Sprints, Git, Front-end, Back-end, Full-stack, TypeScript, JSON, Manufacturing, Microsoft Dynamics, Microsoft Dynamics CRM, Dynamics CRM 365, Microsoft Power Apps, Azure, Angular, Terraform

Full-stack Developer and Senior Manufacturing Engineer

2020 - 2021
OMAX Corporation
  • Integrated prototype system hardware into testing stations as measured with a successful, bug-free launch into production by developing a Node.js-based software interface to manage data collection and hardware control through IO signals.
  • Coordinated with development and operational teams to complete key milestones before crucial release deadlines by creating clean, documented, and tested code.
  • Managed multiple concurrent high-value projects qualified by meeting all program milestones by ensuring tasks were prioritized and continually adjusting the program to align the schedule after issues were identified.
Technologies: Node.js, JavaScript, AngularJS, CSS, HTML, SQL, MQTT, Node-RED, PLC, Modbus Protocol, Mechanical Design, Mechanical Engineering, Controls, Electrical Design, Git, Bitbucket, Front-end, Back-end, Full-stack, Manufacturing

Lead Full-stack Developer and Manufacturing Manager

2012 - 2019
Flow International Corporation
  • Developed a real-time process monitoring system that reduced quality costs by 40% through networking all machines and designing a visual display for operators and management to see the current program status.
  • Digitized manual data collection measured with unmanaged systems by converting excel sheets into a SQL database and developing VBS scripts to manage data verification and import information from operators.
  • Successfully implemented live machine monitoring systems as measured by an increase in the number of quality parts between failures by analyzing inspection results and developing a statistical process control (SPC) system to optimize CNC machines.
  • Grew a manufacturing business idea into a $2.5 million annual revenue program with 8% profit and 100% on-time delivery. Established a fully digital production factory that tracked parts and identified and corrected issues before impacting production.
  • Achieved a 30% savings in the program's consumable costs by developing tool maintenance software that utilizes regression analysis on tool wear against the total allowable tolerance to maximize usage.
Technologies: JavaScript, CSS, HTML, Python, MySQL, Microsoft SQL Server, .NET, Internet of Things (IoT), Product Lifecycle Management (PLM), Agile, Jira, PLC, Web Scraping, API Architecture, REST API Architecture, REST APIs, Full-stack, UI Grid, UI Development, REST, Mechanical Assembly, Mechanical Design, Electrical Design, Controls, Mechanical Engineering, Aerospace & Defense, Git, GitHub, Leadership, Management, Engineering, Engineering Management, Front-end, Back-end, TCP/IP, UDP, Transmission Control Protocol (TCP), Excel Macros, Microsoft Excel, Technical Leadership, Technical Hiring, Linux, Technical Writing, JSON, Manufacturing, Microsoft Dynamics AX

.NET Developer and Manufacturing Engineer

2010 - 2012
Hexcel Corporation
  • Increased on-time delivery from 54% to 89% as measured by the delivery rate three months from implementation by developing an automation program to replace a manual scheduling and planning operation.
  • Reduced the cost waste quantified by scrap and rework costs by employing statistical analysis in a design of experiments program relating production parameters to results to determine optimal formulas for each product.
  • Developed prototypes and production fixtures using additive printers qualified with passing part testing requirements by designing the fixtures and programming the machine.
Technologies: .NET, Visual Basic for Applications (VBA), Python, Aerospace & Defense, Mechanical Engineering, Mechanical Design, Excel VBA, Excel Macros, Project Scheduling, Microsoft Excel, Manufacturing

Equipment Tracking Website

A Node.js React website that tracks a company's assets, including clients, projects, and equipment. Monitors inventory within the building and what is checked out to each associate. The mobile-friendly design allows associates to transfer equipment between each other while offline.

Martial Arts Attendance Tracking

An API-based website interface allowing instructors to check in with clients through a clean and simple user interface and the website was designed around disconnecting instructors from a desktop computer and moving to a mobile device that connects to using API calls to update the client information. The interface is simplified to a single touch to check in a client, replacing a manual of entering each client's name into the point-of-sale system.

Retail Website

A React-based website redesign, modernizing front-end technologies while building a responsive, mobile-friendly site. It integrates an MUI framework to build common components across the website. I added extensive unit and E2E test coverage for the application.

SDK Update

Back-end development to update SDKs in C#, Java, Node.js, PHP, Python, and Ruby. I updated packages with API updates from the prior several years, including unit testing to add coverage for new features.

Website for Bankers

I acted as a full-stack developer modernizing a PHP website to a Django and React website utilizing MUI, TypeScript, and Tailwind CSS. This also required migrating a MySQL database to a PostgreSQL one while providing a unique environment for each individual client.
2001 - 2005

Bachelor's Degree in Aerospace Engineering

Embry-Riddle Aeronautical University - Prescott, AZ


Full Stack Web Developer

University of Washington


Node.js, React, Mindbody API, jQuery, REST APIs, Socket.IO, Handlebars, QuickBooks API


Microsoft Excel, Jira, GitHub, MQTT, Node-RED, UI Grid, Git, Bitbucket, CircleCI, SonarQube, Microsoft Dynamics AX, Docker Compose, Terraform, MATLAB, Microsoft Dynamics, Microsoft Dynamics CRM, Microsoft Power Apps


Material UI, .NET, Bootstrap, Express.js, Jest, Swagger, Django, Next.js, Tailwind CSS, Angular, AngularJS, ASP.NET MVC, Redux


JavaScript, CSS, HTML, SQL, PHP, Excel VBA, Visual Basic for Applications (VBA), Python, HTML5, TypeScript, C#, Java, Ruby


API Architecture, Mechanical Design, REST API Architecture, REST, Management, Continuous Delivery (CD), Agile, Continuous Integration (CI), Testing, E2E Testing


Windows, MacOS, Linux, Docker, Google Cloud Platform (GCP), Oracle, Heroku, Shopify, Azure


MySQL, Microsoft SQL Server, PostgreSQL, Google Cloud, JSON, SQL Server Reporting Services (SSRS), MongoDB


Internet of Things (IoT), Product Lifecycle Management (PLM), Ajax, Web Scraping, Full-stack, Mechanical Assembly, Controls, Mechanical Engineering, Leadership, Engineering, Front-end, Back-end, Excel Macros, API Documentation, Technical Writing, Manufacturing, PLC, APIs, SOAP, CSS5, Modbus Protocol, UI Development, Electrical Design, Aerospace & Defense, Agile Sprints, Engineering Management, TCP/IP, UDP, Transmission Control Protocol (TCP), Project Scheduling, Technical Leadership, Technical Hiring, MERN Stack, PWA, Lint, Progressive Web Applications (PWA), API Testing, SDKs, Software Development Toolkits (SDK), Dynamics CRM 365

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