Sergei Smagin

Feb 2022-Present Nomadix US, UK remote Lead Developer

Promoted and helped achieving consistent and better-than-before UX across the products
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
Converted an app from an acquired one-man-company to a production-ready state
Led a project to keep on-site client hardware up to date, which saved thousands of hours of manual work
Contributed necessary bug-fixes to several open-source projects, namely Ruby on Rails

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