Miroslav Maraz, APIs Developer in Philadelphia, PA, United States
Miroslav Maraz

APIs Developer in Philadelphia, PA, United States

Member since May 15, 2016
Miro is a versatile software engineer with a mix of skills ranging from application development to data engineering and data science. He has 15 years of experience building and delivering data-driven applications to clients of all sizes. He is extremely flexible and able to work as a standalone freelancer or integrate within teams. Miro currently builds intelligent web applications and APIs with embedded smart algorithms and machine learning.
Miroslav is now available for hire


  • Untitled Research
    Python, R, C#, SQL Server 2016, PostGres, HTML, JavaScript, Angular, BreezeJS...
  • Coldlight | PTC
    Talend, AWS, Redshift, SQL Server, PostGres, MySQL, MongoDb, C#, Python, Java...
  • Connolly (Cotiviti)
    SQL Server (Full-Stack), Pervasive Integrator, SSIS, OLAP, R, HTML, ERStudio



Philadelphia, PA, United States



Preferred Environment

Visual Studio, VS Code, Spyder, PyCharm, RStudio

The most amazing...

...project I've architected was a smart healthcare platform that combined medical data from 160 million individuals with machine learning to predict various risks.


  • CTO | Lead Architect

    2015 - PRESENT
    Untitled Research
    • Created a predictive API with Python, Flask, MongoDB, PostGres, and H2O.ai.
    • Designed a desktop master data management application using C#, SQL Server, Entity Framework and DevExpress components.
    • Developed a responsive Angular application for movie data.
    • Created an internal toolkit based on R Server, SQL Server 2016 and H2O that enables rapid development of predictive models and collects supporting data and metadata.
    • Crafted interactive noetebooks that visualized historic data for a music industry client with R Markdown, Bootstrap, Plotly, and Impala SQL.
    Technologies: Python, R, C#, SQL Server 2016, PostGres, HTML, JavaScript, Angular, BreezeJS, Docker
  • Technical Director | Data Services

    2014 - 2015
    Coldlight | PTC
    • Architected a database system that collected 1.1 billion+ healthcare transactions and events for 160 million individuals with Talend and Amazon Redshift.
    • Created a metadata-driven feature engineering and data transformation utility capable of transforming raw data into input features for a machine learning process.
    • Created several workflows in Talend that interacted with several database systems and machine learning and persist the results of machine learning processes.
    • Oversaw an implementation of a Talend-based master data management solution that replaced proprietary, labor intensive solution.
    • Assisted colleagues from various departments to optimize data engineering and data transformation techniques and methods.
    Technologies: Talend, AWS, Redshift, SQL Server, PostGres, MySQL, MongoDb, C#, Python, Java, Tableau
  • Lead SQL Developer | Technical Data Analyst

    2009 - 2014
    Connolly (Cotiviti)
    • Led the re-engineering effort of a 6+TB data warehouse that enhanced performance while reducing storage footprint by 20%.
    • Designed a custom, data collection framework that enabled collection of previously unattainable information from 3rd party systems access with AutoIt, SQL Server, and PowerShell.
    • Implemented various enhancements and optimizations to SQL based ETL processes to enhance performance and reduce processing time by 63%.
    • Developed various data mining analysis of healthcare claim data aiming at identifying anomalies with SQL Server SSAS Data mining algorithms.
    • Created a custom rule engine with XML based storage and SQL based execution that allowed users to create, store and execute business rules against the data warehouse and find qualifying records.
    • Authored and lectured a SQL server advanced course for an internal team of SQL developers.
    Technologies: SQL Server (Full-Stack), Pervasive Integrator, SSIS, OLAP, R, HTML, ERStudio
  • Software Engineer | Data Architect | Co-founder

    2006 - 2009
    KRESS, Slovakia, EU
    • Designed a custom data processing and master data management platform that integrated pharmaceutical sales, logistics and CRM data with VB.NET, DevExpress, and SQL Server.
    • Led the development of a data analysis tool that allowed 400+ users to explore and visualize millions of rows of sales data offline with a proprietary ROLAP technology.
    • Created a GIS-based mapping module that enabled the end users to customize maps and create and analyze sales across custom regions.
    • Automated data aggregation processes used to create offline cubes with metadata driven by using VB, SQL Server, and a proprietary ROLAP engine.
    Technologies: .NET (C#, VB), SQL Server, MySQL, MDX, OLAP, HTML, DevExpress
  • IT Consultant

    2002 - 2009
    Freelance Work
    • Designed and implemented a production management system powered by bar code based data collection that enabled real-time insights into the production progress.
    • Designed a PocketPC based app that allowed plant managers to monitor production progress in real-time from anywhere within the facility.
    • Built a school management application that helped manage courses, classrooms, scheduling, billing, and reporting.
    • Implemented and customized a groupware system for the knowledge base, internal scheduling, articles, and polling.
    Technologies: VB6, VB.NET, SQL Server, Oracle, MySQL, Firebase, MDX, OLAP, Citrix


  • Medical Transportation Intelligence Center (Development)

    A business intelligence system for a medical transportation company that integrated otherwise isolated billing and dispatch systems to allow for simplified reporting, analysis, and effective business management.

  • FLIQ.AI (Development)

    FLIQ is a movie intelligence platform powered by AI technology. It gives unprecedented access to rich, interactive movie analytics.


  • Languages

    SQL, JavaScript, C#, Python, R, Visual Basic, ML Programming Language, Markdown, HTML/CSS, AutoIt
  • Storage

    Microsoft SQL Server, SQL Server Management Studio, PostgreSQL, MySQL, NoSQL, MongoDB, SQL Server Integration Services (SSIS)
  • Other

    Software Development, Predictive Analytics, Machine Learning, APIs, Natural Language Processing (NLP), Virtualization, Data Mining, Lean Startups, DevExpress, Angular Bootstrap
  • Frameworks

    .NET, ASP.NET Web API, Flask, Windows PowerShell, AngularJS
  • Tools

    Microsoft Visual Studio, Talend ETL, Mongoose
  • Paradigms

    REST, Database Design, OLAP, Agile Software Development, DevOps
  • Platforms

    Docker, Talend, RStudio, Azure, Amazon Web Services (AWS)
  • Libraries/APIs

    Flask-RESTful, Node.js, NumPy, Breeze.js, NLTK, Windows Forms


  • Master's degree in Industrial Engineering and Management
    1998 - 2004
    Slovak Technical University - Bratislava, Slovakia, EU


  • MCITP SQL Server Database Administration
  • MCITP SQL Server Business Intelligence
  • MCITP SQL Server Database Development

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