Benjamin Fleischer
Principled Software Engineer at XBE
Chicago, Illinois, United States
Summary
🤩
Rockstar🎓
Top SchoolBenjamin Fleischer is a Principled Software Engineer in Chicago with 15 years of experience building reliable back-end systems, integrations, and ETL pipelines—mostly in Ruby and Shell, with occasional Java, JavaScript, and Python. He focuses on pragmatic maintenance and release engineering, contributing to well-known open-source projects such as Ruby on Rails, SimpleCov, and RMagick where he’s improved renderers, coverage math, and cross-version build robustness. At XBE he combines frontline ops, performance tuning, and customer-facing problem solving, turning conversations into deployable code. His background spans startups and enterprise-facing roles, and he prefers owning durable tooling and clear processes over hype-driven feature churn. Notably, he maintains his resume on his own domain and has little patience for generic outreach, favoring personalized, evidence-backed contact.
15 years of coding experience
7 years of employment as a software developer
MSCIS, Computer Information Systems, 3.72, MSCIS, Computer Information Systems, 3.72 at Northwestern UniversityConservative YeshivaMD, Allopathic Medicine, MD, Allopathic Medicine at Ben-Gurion University of the NegevBAS, Biomedical Science, 3.29, BAS, Biomedical Science, 3.29 at University of Pennsylvania
Hebrew, Spanish, German, Arabic
Github Skills (45)
database-migrations10
application-framework10
ruby-rails10
git10
test-coverage10
lib10
sqlite10
database-connection10
dbconnection10
testing10
app-framework10
rspec10
rails10
better-sqlite310
data-serialization10
Programming languages (20)
Github contributions (5)
rails-api/active_model_serializers
Feb 2015 - Jan 2022
ActiveModel::Serializer implementation and Rails hooks
Role in this project:
Back-end Developer
Back-end DeveloperContributions:32 reviews, 748 commits, 582 PRs in 6 years 11 months
Contributions summary:Benjamin primarily contributed to the `active_model_serializers` repository, a Ruby-based library, focusing on enhancing its serializer implementation and Rails hooks. Their commits involved refactoring templates and test controllers, indicating a focus on the underlying structure and functionality of the serialization process. The user addressed various issues related to caching, association handling, and JSON API document structure, demonstrating expertise in core serialization features and bug fixes within the context of the project's goals.
rails-apirailsresource-serializerrubyserializer
simplecov-ruby/simplecov
Sep 2013 - Feb 2018
Code coverage for Ruby with a powerful configuration library and automatic merging of coverage across test suites
Role in this project:Back-end Developer
Back-end DeveloperContributions:35 commits, 12 PRs, 10 pushes in 4 years 5 months
Contributions summary:Benjamin primarily contributed to the SimpleCov project, a code coverage tool for Ruby. Their commits focus on ensuring accurate coverage reporting by addressing issues related to data types, specifically ensuring the use of Floats instead of Fixnums or Rationals. Additionally, the user refactored and improved the codebase by modifying how the coverage percentage is calculated, and also modified files to ensure proper loading of global configurations. They also made changes to improve the robustness of the code.
railstestingsuitesrubymerging
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