Dan Borstelmann, Developer in St. Louis, United States
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Dan Borstelmann

Verified Expert  in Engineering

Full-stack Developer

St. Louis, United States
Toptal Member Since
November 6, 2018

Daniel has worked in startups and enterprise companies doing full-stack web and mobile development for the last five years. He is passionate about quality software, valuable user experience, and team delivery of great products. As a freelancer, Daniel uses the best practices he has learned to help his clients achieve their goals.


Amazon Web Services (AWS), Salesforce, Heroku, Django, Vue, React Native, React...
iOS, Mobile, Cordova, Salesforce, Django, Backbone.js, Heroku, PostgreSQL...




Preferred Environment

Visual Studio Code (VS Code), Atom, GitHub, Linux, MacOS

The most amazing...

...project I've worked on was a CRM to help improve services for the homeless in St. Louis with the end goal of eliminating homelessness.

Work Experience

Software Engineer Consultant

2017 - PRESENT
  • Built large-scale applications for numerous clients throughout the St. Louis area.
  • Worked with teams, internal and external, to deliver great products.
  • Worked in modern technology stacks to provide clients with the most up to date platforms.
  • Designed enterprise level systems and data architectures.
  • Helped train new generations of engineering talent in the St. Louis community.
Technologies: Amazon Web Services (AWS), Salesforce, Heroku, Django, Vue, React Native, React, PostgreSQL, SQL, Python, JavaScript

Software Engineer

2014 - 2017
  • Built clean UIs in the best technology available.
  • Built reusable application code to improve the efficiency of our engineering team.
  • Worked with other members on the team to build full-stack web and mobile applications.
  • Worked to integrate with other services, such as Salesforce, to increase the value of our product.
  • Developed full solutions across the whole stack and take ownership of delivering full features, from front-end to back-end.
Technologies: iOS, Mobile, Cordova, Salesforce, Django, Backbone.js, Heroku, PostgreSQL, Python, JavaScript

Underscore Templating for Atom

I realized there was no syntax highlighter for Underscore templates in Atom, so I decided to build one! I developed it using Atom's easy extensibility process. Now developers using Underscore's templating system can more efficiently develop HTML files with data.


HTML, CSS, SQL, Python, JavaScript, Objective-C, GraphQL, Swift, TypeScript, CoffeeScript, C++, Java


Bootstrap, Django, Express.js, React Native


Backbone.js, Vue, React, Node.js


REST, Agile


Mobile, Heroku, MacOS, Linux, Visual Studio Code (VS Code), Salesforce, iOS, Amazon Web Services (AWS), Amazon EC2


PostgreSQL, Amazon S3 (AWS S3)


APIs, Full-stack, Front-end, Back-end, User Experience (UX), User Interface (UI), Module Development, Amazon Route 53, Cordova


Amazon CloudFront CDN, GitHub, Atom

2012 - 2016

Bachelor of Science Degree in Computer Science, Architecture

Washington University in St. Louis - St. Louis, Missouri

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