Sergei Smagin

Feb 2022-Present Nomadix US, UK remote Lead Developer

Transformed a one-man-developed app into a fully functional, market-ready product. Resulting in ability to market it as part of the company portfolio and huge decrease in crashes.
Promoted and helped achieving consistent and better-than-before UX across the products. UX became an important selling point
Led a project to keep on-site client hardware up to date, which saved thousands of hours of manual work
Helped the team to set up processes while merging several companies to improve confidence on deploys and reduce synchronous actions done by multiple people.
- Introduced code reviews
- Introduced feature flags
- Added linters to CI, get rid of flakey tests
- Promoted a testing/deployment strategy that doesn't rely on a single person
Helped with a Theseus ship-style rewrite of a captive portal configurator, with a focus on UX
Contributed necessary bug-fixes to several open-source projects, namely Ruby on Rails and rails-i18n

Apr 2019-Feb 2022 Gleam Australia remote Software Engineer

Got team buy-in & lead organization-wide transition to using feature flags to enable developers to ship smaller chunks of changes & simplify PR reviews
Radically improved the campaign creation form in the app:
- Reduced loading time from 6s to under 1s
- Better UX including inline validation for configuration & 3rd-party integrations
- Cut the time users spent on setting up an average campaign in half
- Added validation errors reporting for further monitoring
Optimized Pagespeed score of landing pages from single digits to 95/100 to improve UX and Google rankings
Optimized API endpoints. The "bootstrap" endpoint loads under 1s now.
Contributed necessary bug-fixes to several open-source projects, namely bullet and rack-mini-profiler

2016-2019 Codeart Estonia remote Software Engineer

Reimplemented in-app payment (Stripe/Appstore/Google store) & authorization system for an Ionic app. It became a lot more reliable.
Developed sophisticated authorization systems for a number of marketplaces for centralized data access control.
Had 9 contracts and 6311 hours on Upwork with 100% job success

2015-2016 AVODN Mexico remote Lead Developer

Organized developers to work on DMCA system
Designed a pipeline of services to find videos, check fingerprints, and send emails if they were subjects to DMCA. Added monitoring for every step.
Built a Clojure/ClojureScript CMS for all this

2013-2015 GTFLIX TV Czech Republic remote Junior developer → Developer

Developed a salary calculator, worked on a stolen cards detection system. Created an internal alternative to Percy.

Work Experience