Mark Slosarek, Serverless Developer in Prairie du Sac, WI, United States
Mark Slosarek

Serverless Developer in Prairie du Sac, 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 to find exciting projects he can work on remotely.
Mark is now available for hire




Prairie du Sac, WI, United States



Preferred Environment

Amazon Web Services (AWS), AWS, Linux, Git, Node.js

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: AWS Elastic Beanstalk, Docker, AngularJS, Node.js, JavaScript
  • 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: D3.js, Cordova, PostgreSQL, Oracle, Node.js, Python, AngularJS
  • 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: JavaScript, Magento, MySQL, WordPress, PHP
  • 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: FileMaker, MySQL, WordPress, CakePHP, PHP


  • 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, Django REST Framework, Bootstrap 4, Django, Bootstrap 3, Angular, React Native, Cordova, CakePHP
  • Libraries/APIs

    Node.js, Stripe, D3.js
  • Tools

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

    MEAN Stack, HIPAA Compliance
  • Platforms

    AWS Elastic Beanstalk, AWS Lambda, Linux, Docker, Oracle, WordPress, Magento, Amazon Web Services (AWS)
  • Storage

    AWS S3, AWS DynamoDB, MongoDB, PostgreSQL, MySQL
  • Other

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


  • 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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