Banner Image

Skills

  • API Development
  • Java
  • Android Development
  • App & Mobile Development
  • App Development
  • Artificial Intelligence
  • Bluetooth
  • Bluetooth Low Energy
  • Chatbot Development
  • Docker
  • FastAPI
  • Firebase
  • Generative AI
  • Google Play Development
  • Gradle

Sign up or Log in to see more.

Services

  • Android Bug Fixes & App Performance

    $28/hr Starting at $100 Ongoing

    Dedicated Resource

    I diagnose and fix issues in native Android applications, including crashes, ANRs, memory leaks, performance problems, Bluetooth connection failures, API errors, unstable builds, and Gradle dependency...

    Android DevelopmentAPI DevelopmentApp & Mobile DevelopmentApp DevelopmentBluetooth

  • Spring Boot REST API Development

    $28/hr Starting at $100 Ongoing

    Dedicated Resource

    I design, build, fix, and extend production backend services using Kotlin, Java, and Spring Boot. I have 8+ years of JVM software development experience across mobile backends, real estate, logistics,...

    API DevelopmentDockerJavaKotlinMicroservices

  • RAG AI Assistant & Chatbot Development

    $30/hr Starting at $300 Ongoing

    Dedicated Resource

    I build custom AI assistants and RAG chatbots grounded in company documents, product data, internal knowledge, and live business systems. The assistant can answer questions, search business information,...

    API DevelopmentArtificial IntelligenceChatbot DevelopmentFastAPIGenerative AI

About

Android, Kotlin & KMP Engineer | BLE, Spring Boot, React and RAG AI Assistants

I am an Android, Kotlin Multiplatform, and backend engineer with 8+ years of commercial software development experience.

I have worked on and maintained 30+ production Android applications across logistics, agritech, healthcare, fitness, e-commerce, telematics, and hardware-connected products.

My primary expertise includes:

• Native Android development with Kotlin and Java
• Jetpack Compose and XML user interfaces
• Kotlin Multiplatform for Android and iOS
• Bluetooth Classic, BLE, GATT, ELD, and IoT integrations
• Clean Architecture, MVVM, MVI, and modular applications
• Coroutines, Flow, RxJava, Room, SQLDelight, and DataStore
• Retrofit, Firebase, authentication, maps, payments, and external SDKs
• Spring Boot MVC and WebFlux backend services
• PostgreSQL, MySQL, Redis, RabbitMQ, and WebSockets
• REST API design, JWT, OAuth2, Docker, and automated testing
• React, TypeScript, Redux Toolkit, and server-side rendering
• RAG AI assistants using FastAPI, LangGraph, Qdrant, and LiteLLM

Selected work includes Kotlin Multiplatform logistics applications with real-time ELD hardware communication, Android computer-vision applications, reactive Spring Boot platforms, and a production RAG assistant for a real estate marketplace.

I am comfortable joining existing codebases, investigating difficult issues, reviewing architecture, and delivering changes through clear, testable milestones.

Work Terms

I am available for hourly and fixed-price projects, including short bug fixes, feature development, ongoing maintenance, and complete application components.

For fixed-price work, the scope and deliverables should be agreed upon before development begins. Larger projects can be divided into funded milestones with separate review and approval stages.

Communication is available through Guru messages or scheduled video calls. I usually respond within one business day and provide regular progress updates during active development.

I work remotely from the Eastern European time zone and can arrange reasonable overlap with European and North American teams.

Source code, documentation, and agreed deliverables are provided through the project workspace. Payments should be processed through Guru SafePay.