John Maruska

Professional Experience

• Incremental

  Senior Software Engineer

  Apr 2022 to Apr 2023

  aws, redshift, athena, glue, ec2, step-functions, s3, lambda, clojure, python, postgres, bash, emacs, elisp, javascript, sql, jira, serverless, terraform, kubernetes, postgres, sql, github-actions

  • Served as Senior Software Engineer responsible for championing the development and implementation of innovative technology solutions for a retail media analytics company that connects retail purchase data with advertising campaigns to maximize the value of ad spend.
  • Outperformed established timelines while delivering new features, resulting in increased capacity for service optimization, tooling development, and innovative experimentation. Improvements to the design of the data ingestion pipeline allowed new data sources to be added at a speed greatly exceeding prior expectations.
  • Promoted operational excellence by training and mentoring developers on Clojure and functional programming while exhibiting imperative and object-oriented programming expertise.
  • Optimized new data ingestion time, expanded system visibility, and enabled more efficient response to data inquiries by heading the migration to a new and simplified ETL pipeline.
  • Demonstrated a strong ability to independently drive change, including overseeing the integration of new, standardized data sources into ETL pipeline while requiring zero support from downstream teams.
• Washington University School of Medicine

  Application Developer

  Feb 2021 to Apr 2022

  gcp, python, bash, perl, scala, terraform, cromwell, cwl, wdl

  • Maintained responsibility for analyzing diverse approaches and products for on-demand reproducible runs of precision oncology workflows via cloud servers.
  • Leveraged strong project management skills to drive seamless integration of the cloud solution with the local cluster provenance database.
  • Revamped workflow definitions to industry standard to enable use of cloud workflow orchestration tools.
  • Drafted and prepared detailed technical documentation to clearly outline cloud system utilization across various use cases, successfully providing support to researchers.
• Guaranteed Rate

  Software Engineer

  Jul 2019 to Jan 2021

  clojure, clojurescript, javascript, python, nodejs, reagent, re-frame, react, elisp, aws, s3, serverless, step-functions, sqs, terraform, kubernetes, postgres, emacs, github-actions, jira

  • Aligned objectives and bridged communications with designers, frontend engineers, and dependency teams to develop and launch a user-friendly website to support new borrowers.
  • Owned successful completion of various legacy and incomplete projects to drive value for the business, namely the core TransferSafe service previously owned by a team split in a reorganization, and a few legacy .NET services that needed continued maintenance.
  • Fostered collaborative working relationships with colleagues remotely, effectively navigating team growth from five partially remote backend engineers to 12 fully remote interdisciplinary staff.
  • Learned and utilized new skills in an efficient manner based on business and project needs, including independently learning Terraform and Re-Frame/Reagent libraries; trained staff to develop skillsets.
  • Strategized and led the complete migration of 12+ services from disparate, Serverless stacks to a standardized Terraform managed infrastructure.
• The Climate Corporation

  Software Engineer

  Jan 2019 to Jul 2019

  clojure, ruby, scala, javascript, bash, python, react, ruby-on-rails, aws, postgres, jenkins

  • Improved the efficiency and quality of map images by transitioning the legacy batch-driven, service-oriented microservices system to an event-oriented microservices architecture.
  • Decreased development time related to business logic changes and optimized system visibility by transitioning logic filtering and status tracking processes for ingested geospatial datasets from the legacy pipeline to a separate service.
  • Achieved Engineering Department Award for geospatial ingestion pipeline redesign.
  • Tasked with overseeing legacy services for map image generation from geospatial datasets.
• The Climate Corporation

  Software Engineer Intern

  May 2017 to Aug 2017

  react, javascript, bash

  • Streamlined troubleshooting and escalated issue resolution processes by visualizing individual geospatial dataset boundaries via a React.js frontend; completed an expanded version of the project later on.
  • Drove optimal product adoption of the visualization tool by training the support team, resulting in a reduced number of escalated tickets, decreased engineering time spent on support, and increased time for feature improvement.
  • Mentored and supported interns on Python, Bash, and geospatial team services-related issues.
• AirZaar

  Backend Software Consultant

  Jan 2017 to May 2017

  javascript, ruby, bash, ruby-on-rails, angularjs

  • Strengthened knowledge of Ruby on Rails, Bash tools, and JavaScript through independent study in order to support new feature integration into a Ruby on Rails backend and AngularJS frontend. Added simulation of boreholes in a quarry wall, and export of those boreholes to a printable PDF schematic.
  • Navigated complex challenges, issues, and obstacles with an innovative and solution-focused mindset.
  • Drove continuous improvement by identifying inefficiencies and implementing streamlined solutions.
  • Translated complex technical concepts into simple language for non-technical stakeholders.
  • Gathered and analyzed user feedback to identify feature gaps and opportunities for optimization.
• Missouri S&T Mars Rover Design Team

  Science Software Developer

  August 2015 to May 2017

  python, javascript, c++

  • Participated in the annual Mars Society’s University Rover Challenge, resulting in achieving First Place in the Phobos Division with the Zenith Rover in 2016 and First Place Overall with the Gryphon Rover in 2017.
  • Planned and managed the integration of embedded software sensor readings and communication to enable interfacing with the redesigned RoveComm protocol.
  • Built and integrated a PyQt desktop GUI to enable the display of scientific data.
  • Accomplished the First Place Undergraduate Paper Award by writing and publishing a white-paper on the telemetering system for the International Telemetering Conference in 2016.
  • Utilized programming expertise to mentor junior team members on embedded systems and GUI design.