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Mark Slosarek, Software Developer in Milton, WI, United States
Mark Slosarek

Software Developer in Milton, WI, United States

Member since December 20, 2017
Mark is a full-stack web engineer and JavaScript developer with 13 years of experience. He has developed global, large-scale Node.js and Angular applications and deployed them to Amazon Web Services (AWS). He's worked as an individual developer and as a member of medium-sized development teams. Mark joined Toptal in order to find exciting projects he can work remotely.
Mark is now available for hire



  • MongoDB, 5 years
  • Express.js, 5 years
  • AngularJS, 5 years
  • Node.js, 5 years
  • MEAN Stack, 5 years
  • Bootstrap 3, 4 years
  • AWS DynamoDB, 3 years
  • AWS Lambda, 3 years
Milton, WI, United States



Preferred Environment

Node.js, Git, Linux

The most amazing...

...application I've developed allowed multiple distinct organizations to exchange data and to login into shared equipment.


  • Web Development Manager

    2014 - PRESENT
    Johnson Health Tech Co., Ltd.
    • Converted applications from single server instances to multi-instance auto-scaling applications using various Amazon Web Services.
    • Migrated legacy applications to Docker and Elastic Beanstalk.
    • Designed and developed RESTful web APIs to allows exercise equipment to communicate to applications around the world.
    • Converted web applications from single-stack applications to front-end applications and API-based back-end applications separating development and deployment concerns and reducing risk.
    • Developed a business process to incorporate agile software development methodologies into a waterfall-based manufacturing organization.
    Technologies: JavaScript, Node.js, AngularJS, Docker, AWS Elastic Beanstalk
  • Senior Software Developer

    2010 - 2014
    Healthgrades, Inc.
    • Developed HIPAA compliant web applications using Python (Django) and AngularJS.
    • Led the development team in creating an iOS and Android mobile application for secure messaging between doctors and patients.
    • Ported legacy API services from SOAP/XML to REST/JSON.
    • Created a web analytics and messaging client library in JavaScript to allow the customization of the website's visitor experience.
    • Created a secure and customizable health risk assessment (HRA) application to allow physicians and patients identify health risks.
    Technologies: AngularJS, Python, Node.js, Oracle, PostgreSQL, Cordova, D3.js
  • Senior Web Developer

    2009 - 2010
    Knupp & Watson & Wallman (KW2)
    • Created an API-driven Google map application to display real-time traffic incidents and construction programs.
    • Developed a Magento eCommerce site for an international tool manufacturer.
    • Integrated Magento eCommerce site with WordPress CMS.
    • Developed and maintained custom WordPress themes.
    Technologies: PHP, WordPress, MySQL, Magento, JavaScript
  • Software Engineer

    2005 - 2010
    MC Services, Inc.
    • Designed, developed, and created custom web-based applications to integrate manufacturer inventory systems and accounting software.
    • Ported legacy FileMaker applications to web-based applications.
    • Taught training courses as an Apple Certified Systems Administrator.
    • Worked with schools and large organizations to deploy and maintain Apple computers and servers.
    Technologies: PHP, CakePHP, WordPress, MySQL, FileMaker


  • SurvivorPlan (Development)

    SurvivorPlan is the next generation solution for clinician-friendly, patient-empowering cancer survivorship care planning. Intelligent, easy-to-adopt, and cost-effective, SurvivorPlan enables cancer centers to meet CoC Survivorship Care Plan Standards while creating personalized, living solutions for individual cancer survivors and their care teams.

    On this project, I architected and developed the API layer of the application using Node.js and Swagger. Additionally, I developed the deployment process using AWS Elastic Beanstalk and Docker.

  • Johnson Health Tech. Co., Ltd. (Development)

    At Johnson Health Tech, I built a team of sixteen developers using modern development stacks and platforms.

    Legacy applications were ported to Amazon Web Services Elastic Beanstalk servers using Docker, new applications were developed with API-centric architectures using Node.js, Express, MongoDB, MySQL, Swagger, and Docker.

    The front-end applications were developed using Angular and Bootstrap and deployed as static applications to CDN services with a limited need for servers. Some lightweight services were migrated to Amazon Lambda functions and development pipelines were automated to improve overhead and need to separate system administration.


  • Languages

    JavaScript, TypeScript, Python, PHP
  • Frameworks

    Swagger, AngularJS, Express.js, Serverless Framework, Bootstrap 3, Django REST Framework, Angular, React Native, Bootstrap 4, Django
  • Libraries/APIs

    Node.js, Stripe
  • Tools

    AWS CodeBuild, Git, AWS Push Notification Service (AWS SNS)
  • Paradigms

    MEAN Stack, HIPAA Compliance
  • Platforms

    AWS Elastic Beanstalk, AWS Lambda
  • Storage

    AWS S3, AWS DynamoDB, MongoDB
  • Other

    Serverless, APIs, AWS API Gateway, AWS CodePipeline, Stripe Subscriptions


  • Master of Business Administration (MBA) degree in General Business Administration
    2009 - 2011
    Cardinal Stritch University - Milwaukee, WI, USA
  • Bachelor's degree in Electrical Engineering
    1999 - 2004
    University of Wisconsin-Madison - Madison, WI, USA
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