Вадим

Vadim Kostyanko
Email address: [open contact info](look above in the "contact info" section) Phone: [open contact info](look above in the "contact info" section)

Website: https://github.com/VadimKost

LinkedIn: Vadim Kostyanko

Date of birth: 08/10/2002

ABOUT MYSELF
Android Engineer with 3+ years of hands-on experience building production-ready
mobile applications.
Strong background in feature development, debugging, and analytics integration.
Experienced in supporting legacy codebases, contributing to architectural
improvements, and collaborating within teams working on large-scale products.

Worked across both fast-paced commercial projects and structured long-term
development cycles, including a health-tech application involving Bluetooth
communication with external devices.

Seeking roles that provide professional growth, complex technical challenges, and
opportunities to contribute to high-impact products.

WORK EXPERIENCE
Part-time Contract, NDA Project
[ 24/02/2025 - 29/07/2025 ] Android Developer
• Take part in redesigning and migrating app screens from a legacy codebase to
modern technologies including Jetpack Compose, Coroutines/Flow, and MVI.
• Contributed to a mobile project in the health-tech domain focused on enhancing
user experience for individuals with hearing impairments.
• Collaborated on UX strategy to simplify onboarding and core app navigation for a
sensitive user group
• Integrated FullStory analytics and custom tracking events for behavioral insights
and issue detection.
• Worked with existing Bluetooth LE solutions to ensure stability and reliable
integration with external medical/hearing devices.

MIRA
City: Kyiv | Country: Ukraine

[ 08/11/2023 - 16/09/2024 ] Android Developer
• Delivered new features using modern Android practices
• Integrated Facebook SDK, AppsFlyer, OneSignal, and other services for analytics,
attribution, and notifications
• Collaborated on architecture improvements and codebase modernization
• Participated in debugging, crash reduction, and performance tuning

OfferWall
City: Kyiv | Country: Ukraine

[ 07/09/2021 - 06/10/2023 ] Android Developer & Project Manager
• Developed and maintained certain commercial Android apps using Kotlin, Jetpack
Compose, MVVM, and Clean Architecture
• Built a custom Admin Dashboard Android app for managing advertising operations

• Integrated SDKs (OneSignal, Binom, MyTracker) and optimized tracking flows.
• Performed full project lifecycle management: planning, task distribution,
development, and delivery.
• Worked directly with media buyers, delivered updates, resolved technical issues,
and supported production apps.

Freelance
[ 11/2020 - 06/2021 ] Android Developer
• Designed and developed custom Android applications for individual clients from
scratch using Kotlin and modern Android practices
• Provided ongoing maintenance and support for existing apps, including bug fixing
and performance optimization
• Communicated directly with clients to gather requirements and deliver tailored
solutions
EDUCATION &
TRAINING
[ 2020 - 2024 ] Bachelor
Igor Sikorsky Kyiv Polytechnic Institute
LANGUAGE SKILLS
Mother tongue(s): Ukrainian
Other language(s):
English
LISTENING: B1 READING: B1 WRITING: B1
SPOKEN PRODUCTION: B1 SPOKEN INTERACTION: B1
SKILLS

Languages & Android
Java | Kotlin | AndroidSDK | Android jetpack | Jetpack Compose

Architecture
Clean Architecture | MVI / MVVM | SOLID

Async & Data
Kotlin Coroutines | Kotlin Flow | Retrofit

Tools & Services
Dagger2 | Hilt | Firebase | ExoPlayer | Appsflyer | OneSignal | Git | FullStory