Android Engineer, Kotlin, Java

The Blond HR

Join a fast-growing AI infrastructure company as an Android Engineer reviewing AI-generated Android code. Contribute to training AI models and ensuring high-quality technical outputs.

Posted 6/8/2026contractRemote • 🇺🇸 United StatesMid-LevelSenior💰 $20 - $110 per hourWebsite

Tech Stack

Tools & technologies

AndroidDaggerGradleJavaJUnitKotlinSQLite

About the role

Key responsibilities & impact

Join a dynamic and fast-growing AI infrastructure company that collaborates with Fortune 100 clients to shape the future of machine learning and artificial intelligence.
As a Data Annotator, you will be responsible for accurately identifying, classifying, and annotating entities within PDF documents.
Your work will directly contribute to training AI models that extract structured information from complex documents, making high-quality annotation critical to project success.
As an Android Engineer (Kotlin / Java), you will work remotely on an hourly paid basis to review AI-generated Android code, mobile architectures, and technical explanations.
You will produce high-quality reference implementations and step-by-step reasoning for complex engineering problems.
Assess solutions for correctness, clarity, security, performance, reliability, and adherence to the prompt.
Identify issues in Jetpack Compose/UI, concurrency, threading, memory/performance, app lifecycle, networking, persistence, and build/release practices.
Fact-check technical information; write high-quality explanations and model solutions that demonstrate best practices.
Rate and compare multiple AI responses based on correctness and reasoning quality.

Requirements

What you’ll need

Bachelor’s degree or higher in Computer Science, Software Engineering, or a closely related technical field (or equivalent practical experience).
4+ years of professional experience building production Android apps, including work in Kotlin and (ideally) Java codebases.
Expert-level proficiency in Kotlin (Kotlin 1.6+): null-safety, coroutines/flows, sealed types, generics, and idiomatic patterns.
Strong Android fundamentals: app lifecycle, Activities/Fragments, state restoration, background execution limits, and permissions.
Modern UI experience with Jetpack Compose and/or Views; ability to reason about recomposition, state hoisting, and UI performance.
Concurrency expertise: coroutines, Flow, threading best practices, cancellation, and avoiding race conditions/ANRs.
Strong knowledge of architecture patterns: MVVM, Clean Architecture concepts, dependency injection (Hilt/Dagger/Koin), and modularization.
Experience with networking and data: Retrofit/OkHttp, serialization, caching, offline strategies, and persistence (Room/SQLite/DataStore).
Experience with testing and quality: JUnit, instrumentation tests, Compose UI tests/Espresso, mocking strategies, CI/CD (Gradle, Play Console workflow).
Security awareness: secure storage (Keystore/EncryptedSharedPreferences), auth flows, certificate pinning awareness, privacy permissions, and sensitive data handling.
Minimum C1 English proficiency (written and spoken), with the ability to write clear technical explanations and follow detailed English-language guidelines.
Previous experience with AI data training, annotation, or evaluating AI-generated technical content is a strong plus.
Highly detail-oriented and systematic, with a methodical approach to evaluating reasoning quality and identifying subtle issues in complex Android code.

Benefits

Comp & perks

Be a part of a forward-thinking team and help us train AI to communicate more effectively.
Shape the Future of AI Your work directly contributes to how AI systems learn and communicate.
Your Schedule, Your Rules Set your own hours and work around your life.
Weekly Pay Receive fast, reliable payments once work is approved.
Community Rewards Get rewarded for referrals with ongoing bonus income.

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

KotlinJavaAndroid developmentJetpack ComposecoroutinesMVVMClean ArchitectureRetrofitJUnitCI/CD

Soft Skills

detail-orientedsystematicmethodicalcommunicationproblem-solvinganalytical thinkingcollaborationcritical thinkingtime managementadaptability

Certifications

Bachelor’s degree in Computer ScienceBachelor’s degree in Software EngineeringC1 English proficiency