You will get improved App Performance & Battery Optimization | Android Kotlin Developer
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Project details
This service is focused on improving the stability and efficiency of your android mobile app through deep performance analysis and optimization. As an android developer, I can help identify and fix issues such as ANR errors, memory leaks, excessive battery usage, UI lag, and inefficient background processes that affect user experience and retention.
Platform
AndroidApp Type
Native AppDevelopment Technology
Java, Kotlin, SwiftApp Purpose
Chat, Dating, Delivery, Finance, Gaming, IoT, Maps & Navigation, Medical, News, ProductivityExpertise
Design, Performance Optimization, SecurityWhat's included $200
These options are included with the project scope.
$200
- Delivery Time 7 days
- Number of Revisions 3
- Source Code
16 reviews
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HK
Hanna K.
Apr 20, 2026
Android Developer (Kotlin) for Mobile App Development
Vadim is a top-tier Android developer. After our initial collaboration, we brought him back via rehire for additional feature development and app improvements. He is a reliable Kotlin expert who writes clean, scalable and production-ready code. His communication is always clear, and he has a great sense of product quality. It’s been a pleasure working with him again and we highly recommend him for any long-term mobile projects
HK
Hanna K.
Apr 6, 2026
Android Developer (Kotlin) for Mobile App Development
We had a very positive experience working with this freelancer on our mobile application. He is a reliable android developer with strong android kotlin expertise and a solid understanding of clean architecture, app stability and performance. As an android developer kotlin specialist and experienced kotlin developer, he delivered maintainable solutions, stayed highly detail oriented throughout the project and consistently cared about product quality. He is also a clear communicator, responsive and easy to collaborate with. We appreciate his contribution and would gladly recommend him for future projects
AA
Asim A.
Jul 30, 2024
Senior Android Developer
SM
Stephen M.
Jun 19, 2024
NVU Android App Trial
Vadim's work was outstanding. He consistently executed all tasks on time and communicated clearly with the team. His attention to detail and proactive approach significantly contributed to our project's success. Additionally, Vadim demonstrated exceptional problem-solving skills and was always willing to go the extra mile to ensure the team's objectives were met.
LC
Linda C.
Jun 3, 2024
Android Developer for Barcelona Start-Up
Vadim was a great addition to our team. He is hard-working and has great ideas on how to improve our user experience.
About Vadim
Android Developer Kotlin Developer / Android Mobile App Development
100%
Job Success
Barcelona, Spain - 6:56 am local time
📊 12+ years in mobile delivery
📊 20+ Android-focused projects
📊 10+ years supporting regulated and business-critical products
📊 Experience with compliance-ready apps, secure payments, backend-heavy systems and Software Development
I help companies create secure, maintainable, high-performance apps for Healthcare, FinTech and consumer products.
Core Expertise
🔹 Native Android engineering with modern architecture and Software Design
🔹 Kotlin-first development with maintainability in mind
🔹 Legacy modernization from Java to Kotlin
🔹 Secure integrations, performance tuning, release stability
🔹 Product delivery for Healthcare, FinTech, consumer platforms and Mobile App Development
I’m an android developer focused on products where reliability and clean architecture matter. As a kotlin developer, I build scalable solutions with android kotlin best practices, Jetpack tooling and AOSP awareness. Clients come to me for android developer kotlin expertise when they need stability, lower technical debt and growth.
I work as an android app developer on products that need more than interface implementation. I support teams with android app development for secure solutions where every android app stays maintainable after launch. My background: improving an android application used by thousands of users, integrating backend systems, payment flows, and healthcare-grade data handling. That is why companies hire me as an android mobile developer ( android mobile app developer ) when they need delivery.
What I Do Best
✅ Android development using Kotlin and Java
✅ Architecture design with MVVM, Clean Architecture, modularization
✅ Backend communication, authentication and payment integrations
✅ Performance optimization, debugging, maintenance and release support
✅ Application Improvement for live mobile products
✅ Solo delivery or collaboration inside a larger team
My strongest specialization is android developer kotlin work. I often join teams that need android developer kotlin java skills to modernize legacy code, migrate modules, and improve release quality without a full rewrite. That work benefits from practical experience as a java developer and from thinking like an android kotlin developer who can handle new features and stabilization.
Relevant Experience Highlights
🔸 Healthcare mobile applications with compliance-aware architecture
🔸 Performance optimization and crash-rate reduction
🔸 Secure data handling and app stability improvements
🔸 Secure apps with payment integration and transaction-safe flows
🔸 Backend integrations with PHP, Python, JavaScript, and REST APIs
🔸 Collaboration with iOS, backend, QA, and web teams
🔸 Ability to scale from one engineer to a delivery team
I also have experience with android ble and android bluetooth features for pairing flows and reliable data exchange. Whether I contribute to an android mobile app or support an existing codebase as a mobile developer, I focus on release readiness.
Tech Stack
🔸 Android kotlin with Jetpack, Compose, Android SDK, AOSP
🔸 Java, Firebase, secure cloud services, CI/CD
🔸 REST APIs, secure auth, payment gateways
🔸 Node.js, JavaScript, C#, SQL for backend alignment
🔸 Git, Android Studio, release workflows, crash analysis
🔸 MVVM, Clean Architecture, modular apps, scalability-first mindset
My work is rooted in native Android, but I also understand broader product ecosystems. I collaborate effectively as an ios developer ( ios app developer ) when cross-platform alignment matters, including iOS Development discussions with teams using Swift. I have worked alongside teams using react native and reviewed delivery implications where flutter developer was involved, though I do not present those as my core specialization. That exposure helps me operate as an android developer and product-minded mobile app developer within cross-functional teams.
Team & Product Collaboration
🔹 Coordination with a rest api developer
🔹 Alignment with web application development
🔹 Communication with a web developer or front end developer
🔹 Familiarity with database builder, django, and python automation
Support I Can Provide
✔️ Build a mobile app from scratch
✔️ Join an existing product as an app developer android
✔️ Refactor legacy code and modernize architecture
✔️ fix android application bugs and improve release readiness
I do not position myself as a wordpress, magento, game developer or unreal engine specialist and I do not use unrelated positioning such as android developer india. Even when someone types android develoer, they usually need a senior specialist who can take ownership. I built mobile applications for autism-related projects with intuitive user experience.
📬 If you need an android developer who can improve an existing product, build a reliable solution from scratch or support growth with kotlin developer depth, send me a message.
Steps for completing your project
After purchasing the project, send requirements so Vadim can start the project.
Delivery time starts when Vadim receives requirements from you.
Vadim works on your project following the steps below.
Revisions may occur after the delivery date.
App Performance & Battery Optimization