Stepan Demianenko

Role portfolio

Android Developer

Android-focused graduate developer building Kotlin and Jetpack Compose applications with local-first data handling, clear interaction flows, and user-centred product thinking.

KotlinJetpack ComposeMVVMRoomlocal-first persistenceHealth Connectusability testingUX-informed product development

Evidence

Projects ordered for this role

The same project base is tailored by role so recruiters can quickly see the most relevant evidence first.

Research-informed Android prototype

SDT-Informed Fitness Motivation App

Android fitness prototype balancing utility, clarity, and motivational support.

The strongest Android evidence: Kotlin, Jetpack Compose, MVVM, Room, Health Connect, and research-informed UX decisions.

KotlinJetpack ComposeRoomMVVMHealth ConnectUX Research
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Supporting full-stack project

Music & Notes

Web app for PDF viewing and note-taking.

Provides product and interaction design evidence that complements mobile-focused work.

FlaskJavaScriptHTMLCSSPDF Viewer
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Backend portfolio project

Okta Dashboard Backend

Backend dashboard system with authentication, caching, and containerised services.

Shows useful backend awareness for Android work that depends on authenticated APIs and reliable service contracts.

Django RESTPythonMongoDBRedisDockerOkta OIDC
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System architecture project

Java Spring Boot Microservices System

Modular service architecture using REST, Kafka, and PostgreSQL.

Supports Android applications by showing awareness of the backend systems, APIs, and distributed architecture that mobile products often rely on.

JavaSpring BootKafkaPostgreSQLREST APIsMicroservices
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Skills

Technical toolkit

A practical mix of backend, Android, data, DevOps, testing, and web development skills.

Backend

PythonJavaFastAPIDjango RESTSpring BootREST APIsMicroservices

Android

KotlinJetpack ComposeRoomMVVMHealth Connect

Data and Storage

PostgreSQLMongoDBRedisSQL

DevOps and Workflow

DockerGitHub ActionsGitCI/CD

Testing and Quality

API testingDebuggingUnit testing basicsCode review mindsetMaintainability

Frontend/Web

Next.jsTypeScriptTailwind CSSJavaScriptHTMLCSS