Roxana Chiorean, Software Developer in Truckee, CA, United States
Roxana Chiorean

Software Developer in Truckee, CA, United States

Member since June 6, 2019
Roxana is a senior back-end engineer with nearly a decade of professional experience in both large corporations and startups. After being an open source contributor for the OpenStack cloud framework while at Hewlett Packard Enterprise, she joined a healthcare startup where she specialized in big data processing technologies. Roxana is a friendly individual with a passion for building great multicultural teams.
Roxana is now available for hire




Truckee, CA, United States



Preferred Environment

MacOS, Ubuntu, Vim Text Editor, PyCharm, Git

The most amazing...

...project I've worked on was a data quality visualization dashboard to help users better understand and monitor the quality of data over time.


  • Senior Software Engineer

    2016 - 2019
    Nuna Health
    • Worked on different components of the ETL data processing pipeline and Spark cluster configuration.
    • Helped build data-quality tools to analyze the quality of the processed data.
    • Designed and built a data quality visualization dashboard.
    • Scaled the data platform to be able to process hundreds of terabytes of data.
    • Helped build an API to match patients to primary care providers using Python and Django.
    • Designed and built a web page and a notification system around SLAs for client data.
    • Worked with data scientists to scale the data modeling algorithms.
    Technologies: Amazon Web Services (AWS), Apache Airflow, Looker, AWS, Spark, Scala, Java, Django, Python
  • Software Developer

    2015 - 2016
    Hewlett-Packard Enterprise (HPE Helion Cloud)
    • Contributed to the open source cloud framework project OpenStack, specifically to the authentication and authorization service.
    • Became involved in the open source community by doing code reviews for the other members in the community and participating in planning meetings.
    • Implemented a web single sign-on authentication for HPE Helion Cloud.
    • Improved the OpenStack client command line interface (CLI).
    • Improved the authentication mechanism using LDAP driver integration.
    • Contributed to the open source Python library, ldap3, with code that enabled unit test mocking capability.
    Technologies: Ansible, OpenStack, Python
  • Software Developer | Team Lead

    2011 - 2015
    Hewlett-Packard Enterprise (HP Database and Middleware Automation)
    • Established workflows which automated database and middleware administration tasks.
    • Implemented internationalization and localization of the code.
    • Acted as a system architect and team lead and mentored interns and more junior engineers.
    • Improved code quality by standardizing the code review process.
    • Led projects involving integrations with other HPE software products.
    Technologies: Java, Python
  • Malware Researcher

    2010 - 2011
    • Analyzed the behavior of new malware through reverse engineering.
    • Added detection for the new viruses into the antivirus product.
    • Developed anti-malware heuristic techniques.
    • Created an algorithm to detect illegal key generators through dynamic behavior analysis and image processing.
    • Developed an algorithm to avoid false positive alerts.
    Technologies: Reverse Engineering, Assembly, Python, C


  • Data Quality Visualization Dashboard

    At Nuna Health, as part of the data processing pipeline, we generated a lot of data quality metrics and validations. The problem was that there were so many metrics and validations that it got out of control for a human to comprehend all those generated numbers anymore, so this situation created a lot of manual work.

    I started designing a data quality visualization dashboard that would make it easier for users to understand better and monitor the quality of the data.

    The design process involved user interviews to better understand the project requirements, a couple of brainstorming sessions and multiple prototypes.

    I chose to implement the dashboard using Looker, a business intelligence tool that has nice visualization capabilities for big data analysis. Using Looker's own data modeling language (LookML) I implemented a set of dashboards around the overall quality of the data of a client run, comparison between multiple data processing runs and graphs that highlighted spikes in changes of the data quality over time.

    This tool was used by data operator users and eliminated tens of hours of manual work per month.

  • Primary Care Provider Matching API

    When I worked at a healthcare startup, I helped design and develop a RESTful API for matching a patient with the best available doctor given a set of constraints like health condition, physical location, age, and more.

    It was a very impactful project, shipped to health insurance providers to improve the outcome of patients health care.

    Technologies: Python, Django

  • Data Calendar Web Page and Notification System

    During my time at Nuna Health, I designed and implemented a system for client data schedule management and notifications around important data events.

    This system kept track of the expected schedule for receiving client data, late data updates, expected SLA deliverable dates. I built a web page to display all this information in a user-friendly visual way and a notification system which alerted users via email for important events like late data, the moment when all of the monthly data for a specific client has arrived, and so on.

    This project was developed using Python/Django and Angular and helped reduce a lot of manual work by data operator users who were keeping track of all this information manually in an Excel spreadsheet. It also helped avoiding missing important deadlines.

  • Open Source Contributions for Openstack

    For one and a half years, I had the unique opportunity to be one of the HPE's contributors to the open source project OpenStack. I contributed to multiple parts of the OpenStack repository, and it gave me the opportunity to interact with highly talented developers from other companies which were contributing to OpenStack (IBM, Red Hat, Rackspace, and more).


  • Languages

    Python, SQL, Java, C, Assembly, Scala
  • Frameworks

    Django, Spark, AWS EMR
  • Tools

    Git, Spark SQL, AWS CloudFormation, Jenkins, PyCharm, Vim Text Editor, Apache Airflow, Looker, Ansible
  • Paradigms

    Agile Software Development, RESTful Development, Functional Programming
  • Platforms

    Amazon EC2 (Amazon Elastic Compute Cloud), Linux, Databricks, OpenStack, Ubuntu, MacOS, Amazon Web Services (AWS)
  • Storage

    Amazon S3 (AWS S3), MySQL, MongoDB
  • Other

    Data Engineering, RESTful APIs, AWS, Reverse Engineering


  • Master's Degree in Distributed Systems
    2010 - 2012
    BabeČ™-Bolyai University - Cluj-Napoca, Romania
  • Bachelor's Degree in Computer Science
    2007 - 2010
    BabeČ™-Bolyai University - Cluj-Napoca, Romania


  • Scrum Master
    Agile Development School

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