Jan Koszewski

Senior Software Engineer

Arlington, Virginia, United States14 yrs 10 mos experience
Most Likely To SwitchHighly Stable

Key Highlights

  • Senior Software Engineer at GitHub with extensive Ruby experience.
  • Led engineering efforts for LivingSocial merchant platform.
  • Developed real-time features for iOS applications.
Stackforce AI infers this person is a Backend-heavy Fullstack Engineer with expertise in SaaS applications.

Contact

Skills

Core Skills

Ruby On RailsSoftware DevelopmentRubyIos DevelopmentWeb Development

Other Skills

RailsGitCode ReviewArchitecture DecisionsReal-time FeaturesObjective-CJavaScriptPythonCSSjQueryLeadershipMySQL

Experience

14 yrs 10 mos
Total Experience
2 yrs 11 mos
Average Tenure
4 yrs 9 mos
Current Experience

Github

Senior Software Engineer

Sep 2021Present · 4 yrs 9 mos

RailsRubyRuby on RailsGitSoftware Development

Stitch fix

2 roles

Lead Software Engineer

May 2020Aug 2021 · 1 yr 3 mos

Senior Software Engineer

Jun 2018May 2020 · 1 yr 11 mos

In-q-tel

Software Engineer

Sep 2016May 2018 · 1 yr 8 mos · Washington D.C. Metro Area

Livingsocial

4 roles

Senior Software Development Engineer

Jun 2016Sep 2016 · 3 mos

  • Responsible for all engineering efforts related to the LivingSocial merchant platform; responsible for code review and architecture decisions on 19+ merchant-specific applications, gems, and apis; regularly mentor junior developers and pair with senior level engineers across the LivingSocial build team to enhance and improve the merchant experience
RubySoftware DevelopmentCode ReviewArchitecture Decisions

Career Software Development Engineer

Promoted

Jan 2014May 2016 · 2 yrs 4 mos

  • Member of merchant web core services team that oversees development on the LivingSocial Merchant Center merchant web portal; primary engineer for new feature development on Merchant iOS app.
  • Implemented realtime offer adjustment and cap management. Merchants can pause or set specific times when their promotions are featured throughout the LivingSocial platform and increase or reduce the quantity and type of offers visible to consumers
  • Implemented impersonation feature for LivingSocial staff on merchant iOS app. LivingSocial staff can directly recreate a merchant’s experience on their own iOS device to help troubleshoot support issues, field merchant questions, and better optimize the merchant platform experience
RubyiOS DevelopmentReal-time FeaturesSoftware Development

Associate Software Development Engineer

Aug 2012Jan 2014 · 1 yr 5 mos

  • Junior member of the merchant web core servces team at LivingSocial. Worked to implement the merchant demo website so that LivingSocial sales staff can showcase the full web experience to prospective merchants using tailored data without needing to access the production web portal
RubyWeb Development

Hungry Academy Developer in Training

Mar 2012Jul 2012 · 4 mos

  • Intensive five-month ruby on rails bootcamp. Tasked with developing and deploying a ruby command line application or rails web application every 1-2 weeks in teams of 2-4 other developers in training
  • Key projects included a csv-parsing ruby CLI and singleton datastore, a redesign of the donorshoose.com homepage written in spine.js, a service-backed real-time chat client, and a mastery project that displayed a realtime feed of tweets about LivingSocial deals with a user’s corresponding Klout score as a metric for social influence
  • Delivered 6+ lightning talks on topics such as division in binary, Webkit, Ember.js, and Django
Ruby on Rails

Ppc

Software Testing Associate

Dec 2011Mar 2012 · 3 mos

Jericho road episcopal housing initiative

Grinnellcorps Fellow

Jul 2008Jun 2009 · 11 mos

Education

Grinnell College

Bachelor of Arts (BA) — Political Science and Government

Jan 2004Jan 2008

Stackforce found 100+ more professionals with Ruby On Rails & Software Development

Explore similar profiles based on matching skills and experience