Kostiantyn Selivanov

KS

Open to opportunities

Kostiantyn Selivanov

@kostiantynselivanov

I build production Flutter apps with fast startup, interactive data visualization, and measurable UX improvements.

What I'm looking for

I'm looking to own complex Flutter features end to end, build polished cross-platform products, and use analytics, testing, and product collaboration to improve user experiences.

At Argus Media, I help deliver Argus Mobile for iOS and Android, owning business-critical Quotes and Quote Details workflows across pricing, editing, validation, documents, and production edge cases.

I built interactive line and candlestick charts with pan, zoom, and precise point selection, and helped deliver global search, personalized news, and the Ask Argus AI interface. By profiling application initialization, I reduced startup time from about nine seconds to 650 ms.

Previously at Softonix, I delivered four ERP modules end to end for Slash ERP across web, iOS, and Android, resolved 50+ tickets, improved CSV parsing, integrated Sentry, and shipped urgent production hotfixes. I also refactored shared DriveHRIS workflows, removing up to 200 lines of duplicated code.

I enjoy building reusable Flutter systems: design-system components, automated tests, reliable release workflows, and product analytics that reveal UX friction. Earlier, I built Android platform integrations at Shark Software and developed APIs, authentication, PostgreSQL data handling, and UI features as a Ruby on Rails developer at SoftServe.

Experience

Work history, roles, and key accomplishments

AM

Current

Flutter Developer

Current

Argus Media

Apr 2025 - Present (1 year 4 months)

Delivered the Argus Mobile MVP, owning Quotes and Quote Details, building interactive charts, and reducing startup time by 93%. Contributed 190+ pull requests and 15+ design-system components.

Flutter Dart iOS Android GraphQL BLoC Widgetbook Golden Tests Codemagic Shorebird Sentry CI CD Design Systems Data Visualization

SO

Flutter Developer

Softonix

Dec 2023 - Jan 2025 (1 year 1 month)

Implemented ERP modules, bulk employee import, and Sentry monitoring. Delivered hotfixes and presented features to clients.

Flutter Dart BLoC Sentry OneSignal REST Dart JS Interop

SS

Flutter Developer

Shark Software

Mar 2023 - Nov 2023 (8 months)

Developed WishBox and Train Track apps, including animated cards and platform channels. Published Train Track on Play Store.

Flutter Dart Android CHANNELS CSV Animation app store

SO

Ruby on Rails Developer

SoftServe

Nov 2021 - Mar 2022 (4 months)

Created API endpoints, implemented JWT authentication, and worked with PostgreSQL. Collaborated with designers on UI implementation.

Ruby on Rails PostgreSQL SQL JWT HTML CSS JavaScript

Education

Degrees, certifications, and relevant coursework

LU

Lviv Polytechnic National University

Bachelor's Degree, Applied Mathematics and Informatics

2019 - 2023

Bachelor's Degree in Applied Mathematics and Informatics from Lviv Polytechnic National University.

Tech stack

Software and tools used professionally

GitHub

PostgreSQL

Google Drive

Ruby on Rails

OneSignal

iOS

GraphQL

Firebase

SQL

Shorebird

Codemagic

Island

Android

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