Upstaff Developer Profile Directory

All vetted software engineers you need to build AI, Web3, and data Products.

  • Dedicated Full-time commitment for long-term or Time& Material for shorter or ongoing support
  • Europe, Israel, LatAm, United States, Asia geography coverage
  • Remote and hybrid engagement
  • Trial period, no termination fees or hidden costs for transparent and risk-free onboarding.
Android
OpenCV
Android Studio
Dagger2
Ktor
Firebase
Fastlane
FigJam
Figma
Jenkins
Jira
Miro
Slack
MVVM
MVI (Model-View-Intent)
Teamwork
...

- I am a self-taught Android developer with a passion for building scalable architecture and writing easily maintainable (deletable) code. - I am a big fan of DI frameworks like Dagger, Anvil, or Hilt. - I build apps out of passion outside of working hours, but lately, I have been exploring Ktor on the backend side and working on fully Compose Android applications. - From time to time, I also like to tinker with Figma. - I am passionate about the latest tech, hardware and security.

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Seniority Senior (5-10 years)
Location Ukraine
Kotlin
Java
...

Experienced and self-motivated android developer with 3+ years of experience in developing and supporting applications in production. Worked with applications for education, social sphere and sports. He is a fast learner, eager to learn and share knowledge among co-workers. He works on each project with dedication and creativity.Available in 2 weeks Location: Ukraine

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Seniority Middle (3-5 years)
Location Cherkasy, Ukraine
Swift
Objective-C
KeychainSwift
KVO
Firebase
Realm
Banking
Agile
DRY
Kanban
KISS
Scrum
SOLID
Alamofire
CalendarKit
CocoaPods
Core Data
MapKit
RealmSwift
SnapKit
Swinject
UIKit
CI/CD
Figma
Git
iOS
IOS SDK
RESTful API
Macaroni
XCode
Jira
Slack
UI testing
Unit Testing
GCD
Google Service
Social SDK
Socket
SPM
SwiftHash
WatchKit
...

- 7+ years experience with iOS; - Deep skills working with Swift and Objective C; - Good skills working with Firebase; - Experience working with Google services; - Solid knowledge of SOLID and DRY; - Good abilities working with fintech and banking projects; - Experience in testing; - Upper-Intermediate English.

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Seniority Senior (5-10 years)
Location Ukraine
iOS
Objective-C
Swift
Linkedin
Push notifications
Firebase
Realm
Banking
Agile
Scrum
Alamofire
AVFoundation
CalendarKit
CallKit
CocoaPods
Cocoa Touch
Core Data
Core Graphics
Core Location
MapKit
SnapKit
TestFlight
UIKit
Asana
Jira
BitBucket
Git
CI/CD
Facebook API
IOS SDK
RESTful API
Twitter API
Figma
XCode
sockets
UI testing
Unit Testing
GCD
Multithreading
...

- 6+ years of experience in iOS development; - In-depth knowledge of iOS SDK; - Experience working with fintech and cryptocurrency projects; - Good knowledge of the development of different mobile projects; - Experience working with Objective-C; - Deep abilities with Swift; - Good skills working with Firebase; - Experience in UI/UX implementation; - Good skills in maintenance and testing; - Upper-Intermediate English.

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Seniority Middle (3-5 years)
Location Ukraine
Java 8yr.
Kotlin 3yr.
C
C++
ADB
Android NDK
Android SDK
Android Studio
ButterKnife
Dagger
JDK Tools
JSON
okHttp
RxJava2
Glide
Gson
leakcanary
Picasso
Retrofit2
HTML
XML
Mixpanel
Firebase
MySQL
MySQL Workbench
OrmLite
Realm
SQL
SQLite
Analytic Skills
Android
Android TV
API
Facebook SDK
Google Maps API
RESTful API
Apache NetBeans
Eclipse
IntelliJ IDEA
Atlassian Trello
Jira
YouTrack
BitBucket
Git
GitHub
Gradle
GSM
HTTP
HTTPS
XMPP
JUnit
Zeplin
Linux
macOS
Windows
Atlassian
Dalvik Debug Monitor Server (DDMS)
Fabrictools
fcm
Giphy
Google Cast
Leanback
Okio
Sensey
Smack
...

- Having over 7+ years of experience in developing native mobile and TV applications for the Android platforms - Deep knowledge of the Android Framework significantly increased my technical and soft skills. - Successfully accomplished above seven long-term projects at the middle, senior, and team-lead developer positions, and tech consultant. - Also participated in many short-term, bug fixing, feature adding, and library developing projects. - Have strong mathematical and computer science background - Upper-Intermediate English - Available ASAP

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Seniority Senior (5-10 years)
Location Ukraine
Java
Kotlin
Kotlin Coroutines 3yr.
Android Jetpack
Android SDK
Angroid Architecture Components
Koin
Room (Android Jetpack)
Crashlytics
Dagger2
Data binding
Glide
Navigation
Push notifications
Retrofit2
RxJava
Socket.io
Firebase
Firebase Realtime Database
FireStore
Realm
A/B Testing
Authentication
Unit Testing
Analytic Skills
Google API
Stripe
CI/CD
GitLab CI
Fastlane
Google Play
MVP
MVVM
WebSockets
Detekt
fcm
Firebase App Distribution
HMS
Ktlint
LruCache
Multi-module apps
Remote config
...

- Android Software Engineer with 7 years of experience in native android development - 3+ years of team-leading experience - Upper-Intermediate English - Available ASAP

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Seniority Senior (5-10 years)
Location Zaporizhia, Ukraine
JavaScript
Flutter
DevOps
...

0.5+ year of experience in Software Development; Development of mobile applications for clients and internal use;

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Seniority Junior (1-2 years)
Location Lviv, Ukraine
Swift 7yr.
macOS 9yr.
SQL 7yr.
Alamofire 7yr.
Core Data 7yr.
UIKit 7yr.
Git 7yr.
iOS 7yr.
Jira 7yr.
Postman 7yr.
Scrum 7yr.
CocoaPods 6yr.
Realm 5yr.
MapKit 5yr.
Unit Testing 5yr.
Fabric 4yr.
Moya 4yr.
ARKit 4yr.
Core Bluetooth 4yr.
SceneKit 4yr.
Google Maps API 4yr.
Sketch 4yr.
Dispatch 4yr.
IGListKit 4yr.
Foundation 3yr.
AVFoundation 3yr.
StoreKit 3yr.
Sinatra 2yr.
Firebase 2yr.
Core Location 2yr.
Viper 2yr.
MediaPlayer 2yr.
SOLID 2yr.
XCode 2yr.
Generamba 2yr.
Push notifications
Starscream
Facebook SDK
RESTful API
Stripe
Swagger
Uber API
GitLab
Miro
DeclerativeTVC
iBeacon
Twilio SDK
Zendesk
...

- 7+ years of iOS developer - 7 years of experience with Swift - Upper-intermediate English - Available ASAP

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Seniority Senior (5-10 years)
Location Ukraine
iOS
Objective-C
Swift
C
C++
GLSL
x86 Assembly
Streaming
SQL
AES
Appium
AVFoundation
UIKit
Bluetooth
Git
SVN
Linux
IOS SDK
Embeded
...

- 5+ years of experience as the iOS Software Engineer - Intermediate English level - Available ASAP

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Seniority Middle (3-5 years)
Location Ukraine
Swift
Objective-C
AWS SDK for Android
WebKit
Google Analytics
Firebase
Alamofire
CocoaPods
Core Data
SnapKit
SwiftLint
SwiftUI
Facebook SDK
JWPlayer
ObjectMapper
Push Notification
ReSwift
WidgetKit
WKWebView
...

- 4+ years experience in iOS apps development - Hands-on scripting experience with Swift; Objective-C, iOS APIs and Frameworks, 3rd party libraries. - SwiftUI, Firebase and CoreData.

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Seniority Middle (3-5 years)
Location Ukraine
iOS 5yr.
Android 2yr.
Java
Kotlin
Objective-C
Swift
...

iOS developer with 5+ years of proven working experience in designing, building, and maintaining iOS applications. He is proficient in Objective-C and Swift, has a strong knowledge of iOS frameworks, as well as code versioning tools.Alexei is familiar with RESTful APIs, experienced in continuous integration, and automated testing. He possesses an in-depth understanding of various programming technologies, UI/UX standards, as well as Agile development methodologies. In addition, Alexei can boast of vast expertise working closely with cross-functional teams to define, design, and ship new features, as well as interacting with customers.

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Seniority Senior (5-10 years)
Location Warsaw, Poland
Swift
React Native
Firebase
NoSQL
Atlassian Trello
Jira
AVFoundation
Core Animation
Core Data
BitBucket
Git
Cornerstone
DRY
KISS
MVVM
SOLID
iOS APIs
...

- 6+ years of experience with iOS - Hands-on scripting experience with CoreData, Core Animation, AVFoundation, MVC and MVVM - Proficient with Swift 4.0, Objective-C, React-Native, RESTful APIs

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Seniority Middle (3-5 years)
Location India
Java
Kotlin
Android Jetpack
Android SDK
Android Studio
Retrofit
Room (Android Jetpack)
Glide
Java Core
JSON
Material UI
Firebase
SQLite
Android
Collections API
RESTful API
Git
MVP
OOP
UI/UX
Multi-threading
...

- Android Engineer (6 months) - Educational program (mentoring, code review, git-flow, task management, time management) - Android Fundamental Courses - Available ASAP

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Seniority Junior (1-2 years)
Location Kharkiv, Ukraine
Flutter
Dart
Java
Android SDK
Android Studio
Java Core
SQL
API
MVP
MVVM
Bloc
databases
...

7 years of professional expertise in IT industry; Android developer with 5+ years of experience Flutter developer with 2+ years of experience

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Seniority Senior (5-10 years)
Location Cherkasy, Ukraine
JavaScript 3yr.
React 1yr.
React Native 3yr.
Android 3yr.
Atlassian Trello 3yr.
Jira 3yr.
Git 3yr.
iOS 3yr.
Linux 3yr.
Windows 3yr.
Visual Studio 3yr.
C# 2yr.
TypeScript 2yr.
.NET 2yr.
CSS 1yr.
HTML5 1yr.
Redux 1yr.
MySQL 1yr.
JSON API 1yr.
RESTful API 1yr.
...

- 3 years of experience in the software development. Working on mobile and web development using JavaScript frameworks like React, React-native, Redux. Highly experienced in creating custom components according to the design. Confident with my skills in Unit Testing, HTML, CSS, API integration. - Intermediate English - Available ASAP

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Seniority Middle (3-5 years)
Location Lviv, Ukraine
JavaScript 4yr.
React Native 4yr.
React 4yr.
Firebase 3yr.
TypeScript
Crashlytics
CSS
HTML
jQuery
Kitten UI
Material UI
SASS
SCSS
React-Saga
Redux
Redux Persist
Webpack
MongoDB
MySQL
Firebase Analytics
Apiary
Facebook API
Facebook SDK
Geolocation API
Google Maps API
Google SDK
BitBucket
Git
Jira
Dynamic links
Firebase FCM
Firebase services
Twitter​Bootstrap​
...

- A detail-oriented software engineer with 4 years of experience in web and mobile development. - Intermediate English - Available in two weeks

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Seniority Senior (5-10 years)
Location Ukraine
React
React Native
Firebase 4yr.
JavaScript
CSS
HTML
Node.js
Redux
...

Senior React Native Developer

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Seniority Senior (5-10 years)
Location Uzhgorod, Ukraine
iOS 11yr.
Swift 5yr.
Objective-C 5yr.
Java 3yr.
Spring Boot 3yr.
React Native 3yr.
Unity 2yr.
ASP.NET Web API 1yr.
Xamarin 1yr.
...

Expert with iOS swift/ Objective C development Nearly 2 years experience on Java Spring Boot development

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Seniority Senior (5-10 years)
Location Karachi, Pakistan
Flutter
Objective-C
iOS
Android
Dart
Swift
Salesforce
Firebase
RESTful API
Bloc
Provider
...

- 15 years of experience in IT. 3 years of experience as a Flutter Developer. - He has experience in developing applications from scratch using the Flutter framework. He has good experience in developing mobile applications for both Android and IOS. Writing and maintaining existing programs. - Experience with programming languages Objective-C and Swift. - Upper-Intermediate English - Available ASAP

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Seniority Middle (3-5 years)
Location Turkey
Kotlin 2yr.
...

Kotlin

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Seniority Middle (3-5 years)
Location Tashkent, Uzbekistan
Android 6yr.
Java
Kotlin
Android Jetpack
ButterKnife
Hilt
Koin
Retrofit
Room (Android Jetpack)
ViewBinding
Crashlytics
Dagger
DataBinding
Glide
Gson
OSMdroid
JSON
Jsoup
okHttp
Firebase
ObjectBox
SQLite
Firebase Cloud Messaging
Google Cloud Messaging
BitBucket
Git
GitLab
SVN
Clean Architecture
MVC
MVVM
SOLID
Google Maps API
RESTful API
MVP
WebSockets
...

- Senior Android Engineer with 6+ years of commercial experience and strong organizational skills. - Proficient in Android development using Java, Kotlin, and libraries like Retrofit and Room. - Expert in methodologies like MVC, MVVM, Clean Architecture, and SOLID principles. - Comfortable working with REST API, version control tools like Git, and project management through MVP. - Upper-Intermediate English - Available ASAP

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Seniority Senior (5-10 years)
Location Ukraine
Flutter
Dart
Artemis
Java EE
Java SE
JSON
Hibernate
Spring Boot
Vaadin
Firebase
MySQL
Oracle SQL
SQLite
Apache Maven
BitBucket
Git
GitLab
SVN
Docker
Jenkins
Jira
Kafka
microservices architecture
RESTful API
SOUP
...

- Software Developer with 4 years of professional experience in mobile and enterprise apps development. - 2 years of experience as a mobile developer using Flutter - 3 years of experience with Java - Upper-Intermediate English - Available ASAP

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Seniority Senior (5-10 years)
Location Plovdiv, Bulgaria
Flutter
Dart
C#
JavaScript
Android SDK
Android Studio
Retrofit
CSS
HTML
React
Firebase
Microsoft SQL Server
PostgreSQL
Google API
RESTful API
Flutter SDK
Microsoft Visual Studio Code
XCode
Atlassian Trello
Jira
Git
SOLID
...

- 2+ years of experience developing mobile apps with Flutter - Participated in projects full-cycle development from scratch - Has experience with native Android/iOS SDKs - Has basic experience with JS, React - Intermediate English - Available ASAP

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Seniority Middle (3-5 years)
Location Ukraine
Java
Kotlin
Dart
Android SDK
Hilt
Jetpack Compose
Koin
Room (Android Jetpack)
Canvas
Dagger
okHttp
RxJava
Data binding
Glide
Gson
Kotlin Coroutines
LivaData
Moshi
Retrofit 2
Material UI
Firebase
SQLite
AWS
Android
Google Colaboratory
Daylimotion Player SDK
Elevation API
Google Maps API
Google Places API
Kotlin Flow
RESTful API
Flutter SDK
FreeBSD
Linux
macOS
Windows
Git
Jira
MVVM
OOP
XMPP
...

- 5+ years of experience in Android Development - Experience in developing applications using Java, Kotlin, Dart - Excellent knowledge of OOP - Experience in using Software design patterns - Good logical thinking, self-learning, high level of responsibility - Responsible, hard-working, result-oriented, creative and communicable, team player - Good attention to details - Upper-Intermediate English

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Seniority Senior (5-10 years)
Location Ukraine
Java
Kotlin
Android
Angroid Architecture Components
Cicerone
Google Play services
Koin
Retrofit
Room (Android Jetpack)
Data binding
Glide
Kotlin Coroutines
OSMdroid
Retrofit2
okHttp
RxJava2
Firebase
Google Services
Atlassian Confluence
Jira
BitBucket
Git
Clean Architecture
MVVM
SOLID
HTTP
HTTPS
MVP
Postman
RESTful API
Swagger
...

- Experienced Android Engineer with 6+ years in Java and Kotlin app development. - Proficient in Android development frameworks like Retrofit and Room (Android Jetpack). - Expertise in Clean Architecture, SOLID, MVVM principles, REST API, and HTTP. - Skilled in project management using Atlassian JIRA, Confluence, and Agile methodologies. - Upper intermediate English - Available ASAP

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Seniority Middle (3-5 years)
Location Rivne, Ukraine
C#
Java
Objective-C
Swift
Android Studio
Entity Framework
.NET
WPF
XML
SQLite
Azure DevOps
Eclipse
Visual Studio
XCode
Bamboo
Jenkins
Git
SourceTree
Jira
Redmine
Scrum
TestFlight
Xamarin
xunit
Web API
...

- Xamarin developer with more than 7 years of experience in IT industry. - With Xamarin specifically I’ve been working for the last 6 years. - Deep knowledge and professional expertise in C#, Xamarin iOS and Xamarin Android (both Native and Forms). - Experience in participation in full life-cycle of software design and development process including requirements gathering and analyzing, technology selection and architecture design, application core development, testing and deployment. - Upper-Intermediate English. - Available ASAP

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Seniority Senior (5-10 years)
Location Ukraine
Android 7yr.
Flutter 3yr.
Java
Kotlin
Dart
AdvancedRecyclerView
Android Bluetooth
Android Reflection
Android Studio
Retrofit
SharedPreferences
Canvas
WebView
okHttp
RxJava
Moor
SQL
Adobe Photoshop
Adobe XD
Figma
Atlassian Confluence
Atlassian Trello
Jira
Charles Proxy
Mantis
Postman
Zeplin
Facebook Auth
RESTful API
Git
iOS
Linux
macOS
Windows
Kanban
Scrum
MQQT
WebSockets
ApkTools
CustomClipper
Custom View
CustomView
DotDivider
FilePicker
FlutterIcon
FlutterSvg
GoogleSignIn
JodaTime
MatLog
MPAndroidChart
NotepadQQ
Nucleus
PinEntryTextField
ShowcaseView
UrlLauncher
...

- 16 years of experience in IT. 3 years of experience as a Flutter Developer. - He has experience in developing applications from scratch using the Flutter framework. - Intermediate English - Available ASAP

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Seniority Middle (3-5 years)
Location Poland
Swift
Objective-C
C++
Foundation
Metal
Realm
AFNetworking
Alamofire
Core Data
Core Foundation
Core Graphics
Core Location
GPUImage
MapKit
Git
SVN
iOS
macOS
Windows
Qt Framework
XCode
MessageUI
MFMailCompose
ObjectMapper
PortSIP
SDWebImage
SwiftyJSON
...

- 8+ years of experience in the IT industry developing native IOS applications - Providing a full-cycle mobile development using the latest versions of Swift and Objective-C - Hands-on scripting experience with CoreData, Core Animation, AVFoundation, MVC, and MVVM - Upper-Intermediate English - Available ASAP

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Seniority Senior (5-10 years)
Location Poland
iOS 11yr.
Objective-C 11yr.
Swift 5yr.
Java 3yr.
Unity 2yr.
Xamarin 2yr.
Spring Boot 1yr.
...

I have been working as an iOS developer for more than 10 years and I am currently working as an outsourced developer at SquareTrade(an AllState company). I am working on an app that is being used by millions of customers in the US.

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Seniority Senior (5-10 years)
Location Karachi, Pakistan