Bruz Marzolf, Developer in Snohomish, WA, United States
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Bruz Marzolf

Verified Expert  in Engineering

Back-end Developer

Snohomish, WA, United States
Toptal Member Since
January 14, 2016

Bruz is a full-stack developer who has loved building things for the web since he first started doing it over 15 years ago. Bruz has spent a lot of time on the back end building services with Ruby and Elixir and working with databases and infrastructure, but has also done substantial work on the front end building apps in JavaScript.


Bruzilla Development
JavaScript, TypeScript, Capacitor, Ionic, Supabase, SQLite, React, Tailwind CSS...
TypeScript, React, MobX, Elixir, PostgreSQL, SQL Performance, Linux, Docker...
React, Ruby on Rails (RoR), Ruby, PostgreSQL, Docker, Redis, SQL Performance...




Preferred Environment

Git, MacOS, Visual Studio Code (VS Code), Terminal

The most amazing...

...project I've worked on involved leading the development of a complex back end that scaled to millions of users working on the sophisticated front end.

Work Experience


2023 - PRESENT
Bruzilla Development
  • Built a mobile app for a niche market, with a beta release to hundreds of users with excellent feedback and a recent launch to production.
  • Developed the mobile app in TypeScript quickly, leveraging React, Ionic, and Capacitor.
  • Implemented a fully offline mobile experience to provide excellent security and privacy while allowing a cloud backup and restore option.
Technologies: JavaScript, TypeScript, Capacitor, Ionic, Supabase, SQLite, React, Tailwind CSS, Python

Staff Software Engineer

2019 - 2023
  • Led all back-end development, including infrastructure, database design, and the API.
  • Built an entirely new API using Elixir to facilitate scaling up the product and enabling new capabilities and seamlessly transitioned a large user base over to it.
  • Developed significant features in the complex front-end app using React and TypeScript.
Technologies: TypeScript, React, MobX, Elixir, PostgreSQL, SQL Performance, Linux, Docker, Object-oriented Programming (OOP), Functional Programming, Back-end, Database Design, Front-end, APIs, Phoenix, REST APIs, CSS, DigitalOcean, Full-stack, Graphs, Tailwind CSS, Heroku, Amazon Web Services (AWS)

Senior Software Engineer

2016 - 2019
  • Built new features, working across the Ruby on Rails back end and React front end.
  • Implemented a data analysis pipeline used to provide personalized results for users based on their lab results.
  • Added efficient and comprehensive testing methodologies to allow validation of highly personalized user results.
Technologies: React, Ruby on Rails (RoR), Ruby, PostgreSQL, Docker, Redis, SQL Performance, Object-oriented Programming (OOP), Back-end, Database Design, Front-end, APIs, REST APIs, CSS, Full-stack, Graphs

Freelance Web Developer

2010 - 2017
Fat Cork
  • Built the initial eCommerce site for the business using a framework to quickly get to market.
  • Overhauled the initial eCommerce app to provide a custom back-end interface that better matched their business.
  • Included a high level of unit test coverage for the complex business logic in the overhauled app, and a large end-to-end test suite to provide high confidence when making changes.
  • Proactively monitored issues with the site and fixed them.
  • Managed email accounts and other IT needs of the company.
Technologies: Redis, PostgreSQL, Ruby on Rails (RoR), Ruby, Object-oriented Programming (OOP), Back-end, Database Design, CSS, DigitalOcean, Intuit QuickBooks, Full-stack

Back-end Ruby on Rails Engineer

2016 - 2016
Clustrix (via Toptal)
  • Optimized memory usage extensively to operate within a relatively small memory footprint.
  • Redesigned various database-intensive operations to greatly improve performance while still maintaining the same simple API.
  • Rewrote a key multi-threaded background process to improve speed and reliability.
  • Wrote and maintained Bash utilities used by customers to maintain their installations.
  • Added an API annotation system that provided both parameter validation as well as API documentation.
Technologies: Bash, SQL, Ruby on Rails (RoR), Ruby, Linux, SQL Performance, Back-end, APIs, REST APIs

Senior Front-end Engineer

2016 - 2016
Luno (via Toptal)
  • Created various new user interfaces in a sophisticated React stack that used state management with Redux, universal rendering, and data fetching.
  • Implemented the form handling system used throughout the app.
  • Supported a new UI with unit tests for the React components.
Technologies: React, JavaScript, Front-end, CSS

Senior Software Engineer

2011 - 2016
  • Led the development of the main Ruby on Rails/Backbone.js customer-facing web app.
  • Built 11 Ruby microservices to support various new features.
  • Helped transition to a Docker infrastructure from a monolithic application.
  • Built a service to package microservices with Docker, streamlining the deployment pipeline.
  • Led the development of the web apps for three new rapidly-developed products.
Technologies: Amazon Web Services (AWS), JavaScript, Docker, MySQL, Ruby on Rails (RoR), Ruby, Linux, Redis, Object-oriented Programming (OOP), Back-end, Database Design, Front-end, APIs, REST APIs, CSS, Full-stack, Heroku

Lab Manager

2000 - 2011
Institute for Systems Biology
  • Developed and supported web applications for lab workflows, primarily using Ruby on Rails.
  • Created data analysis pipelines using the R statistical language.
  • Built image analysis tools using Java to support novel research techniques.
  • Performed data analysis on data sets for various researchers.
  • Demonstrated strong writing skills, authoring journal publications, grant applications, and internal documentation.
Technologies: Java, R, JavaScript, Ruby on Rails (RoR), Ruby, Linux, Object-oriented Programming (OOP), Back-end, Database Design, Full-stack

Fat Cork
Created a custom eCommerce app with a sophisticated back end to support the company's champagne club. It's a complex Ruby on Rails (RoR) app with a large suite of unit and end-to-end tests to allow the app to continually improve with high confidence that it will not break existing features.

Moment Prints

Led the development of a service to make it easy to get photo prints monthly by automatically importing and filtering out bad photos. I used React for the front end, Ruby for the back end, and Python-based machine learning (ML) to inform the filtering algorithm.

My Flare

Developed a large-scale cloud storage and collaboration service. Built with a Ruby on Rails (RoR) and Backbone.js front end. I utilized many technologies on the back end, including several Ruby microservices and an AWS-based infrastructure with Docker.
1996 - 2000

Bachelor of Science Degree in Biochemistry

Western Washington University - Washington


React, REST APIs, MobX


Git, Terminal, Capacitor


Ruby on Rails (RoR), Phoenix, Tailwind CSS, Ionic


PostgreSQL, Redis, MySQL, SQL Performance, SQLite


Ruby, JavaScript, Elixir, TypeScript, Python, CSS, R, Java, SQL, Bash


Object-oriented Programming (OOP), Functional Programming, Database Design


Amazon Web Services (AWS), Docker, Linux, DigitalOcean, Heroku, MacOS, Visual Studio Code (VS Code)


Back-end, Front-end, APIs, Full-stack, Intuit QuickBooks, Graphs, Computer Vision, Supabase

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