Олександр

Oleksandr Tokariev
Senior Android Software Engineer

Profile

Senior Android Software Engineer with 5+ years of experience building
enterprise POS and payment-related applications. Specialized in Kotlin,
Clean Architecture, Android, hardware/peripheral/payment integrations,
and AWS-backed services. Experienced in leading development teams,
Contact maintaining high-load enterprise applications, and improving software
quality through automated testing and CI/CD. Proven ability to deliver
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solutions that drive business growth and operational efficiency.
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LinkedIn Work Experience
GitHub
HS-Soft
Skills Senior Android Software Engineer JAN 2024 - PRESENT
Lead development and evolution of enterprise Self-Order and POS
Android: Kotlin, Android SDK, Jetpack Android solutions, delivering features while adapting to evolving
Compose, Material Design, Android business, customer, and hardware requirements.
Views, Navigation, ViewModel,
Designed and delivered end-to-end features across Android
applications and backend services using Node.js and GraphQL.
Lifecycle, WorkManager. Established and maintained automated quality assurance for the
Architecture: Clean Architecture, CashAssist platform, developing end-to-end, instrumentation, and
SOLID, MVVM, MVI, MVP,
unit tests to improve product stability and reliability.
Led integration and certification of Sunmi and DIBAL weighing
modularization. solutions for Android register systems, including hardware
Async: Kotlin Coroutines, RxJava. communication, protocol implementation, documentation, and
Data & Networking: Room, DataStore,
WELMEC compliance.

Retrofit, OkHttp, GraphQL, REST APIs.
Dependency Injection: Hilt, Dagger 2. HS-Soft
Testing: JUnit, MockK/Mockito, Lead Android Developer Nov 2021 - Jan 2024
Espresso, Kaspresso, Compose UI tests.
Led Android development teams, coordinating stakeholders, delivery
CI/CD: CircleCI, AWS CodeBuild, Bash. planning, technical reviews, and project execution.
Backend & Cloud: Node.js, GraphQL, Designed Android libraries for EFT payment terminals and peripheral
devices, integrating USB and TCP/IP communication with printers,
MySQL, DynamoDB, AWS Lambda, S3,
smart cards, and payment hardware.
AWS CDK. Led major modernization initiatives, migrating RxJava to Kotlin
AI-Assisted Engineering: Spec-driven Coroutines, XML to Jetpack Compose, and MVP to MVI architecture.
Improved application performance, stability, and maintainability
development, agentic engineering
through architectural refactoring, modernization, and technical
workflows, Copilot CLI, Codex, Claude leadership.
Code, Cursor, OpenClaw.
HS-Soft
Certifications Android Developer Dec 2020 - Nov 2021
Built and maintained Android features for POS and enterprise
AWS Cloud Essentials applications, delivering new functionality and resolving UI and
Getting Started with Deep Learning business logic issues to improve reliability.
Contributed to application modernization through Material Design
Languages adoption, Firebase Cloud Messaging integration, and architecture
improvements.
English (Fluent) (both written &
verbal) EDUCATION
Ukrainian (Native)
Spanish(A2) Polish-Japanese Academy of Information 2018-2020
Location Technology (Warsaw)
Drahomanov National Pedagogical University 2020-2021
València, Spain. (Kyiv)