Hire Vetted Mobile Application Engineers at Upstaff - Page 2
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.
Mobile Application
All
Web Application
Data and Analytics
Cloud and Operations
Mobile Application
Blockchain
Design and Creative
Digital Platforms
Quality Assurance
Project Management
Desktop Application
Scripting and Automation
Marketing and SEO
Embedded Systems
Writing and Translation
Low-Code and No-Code
GameDev
Industrial Engineering
React 2yr.
Facebook Auth 1yr.
Java 1yr.
- Front-End Developer with expertise in React.js and Flutter, delivering responsive, high-performance web and cross-platform mobile applications.
- Proficient in translating UI/UX designs into scalable, pixel-perfect interfaces, with strong skills in component-based architecture and performance optimization.
- Experience in Agile methodologies, collaborating with cross-functional teams to deploy digital solutions and enhance user engagement.
- Background in Agricultural & Bio-environmental Engineering with additional certifications in Business Strategy, CRM, HR, and Project Management.
- Hands-on knowledge of blockchain technology and decentralized platforms, complemented by full-stack development experience using Java and Asp.Net.
Dart 5yr.
Kotlin 3yr.
GraphQL 3yr.
MVVM+Rx 3yr.
Software engineer with 5+ years of experience, specialized in Flutter development and project architecture. Core competencies include mentoring Flutter teams, setting development standards, and implementing CI/CD pipelines. Impressive track record of creating applications using MVVM, GraphQL, RestAPI, and a range of other technologies like Firebase and Chromecast, with experience in developing native plugins with Kotlin, Java, Swift, and JavaScript. Demonstrable expertise in enhancing the performance of legacy projects and modularizing project structures. Education includes ongoing studies in Analysis and Systems Development and a background in Computer Technology. Highly skilled in front-end development, database design, DevOps practices, and mastering various programming languages. Proficient in applying Agile principles and proven problem-solving abilities, coupled with strong leadership and mentoring skills.
React
React Native
HTML/CSS Preprocessors
JavaScript
Next.js
Highly skilled ReactJS and React Native developer with 5+ years of experience in crafting robust web and mobile applications. Strong background in mechanical engineering with a transition to software development, showcasing adaptability and a multifaceted skill set. Adept at leading projects, such as a significant migration to new web apps with React and real-time APIs using RabbitMQ, and creating survey tools with AI-powered analytics. Possesses hands-on expertise in React, Redux, Flutter, NextJS, NuxtJS, and modern frontend technologies, complemented by a track record of successful cross-functional collaboration. Contributed to multiple large-scale projects, notably enhancing customer experience through AI-powered social media insights. Successfully completed a frontend-focused education at ITI, underpinned by a BSc in Mechanical Engineering and professional certifications including PMP and JavaScript algorithm mastery.
ASP.NET Core Framework 8yr.
C/C++/C# 8yr.
React Native 2yr.
Software engineer with 8 years of experience, including specialization in React native, .Net development, and a strong background in the banking sector, HR, health, and biometric device integration. Proven track record in designing resilient cloud solutions with Microsoft Azure, and expertise in full SDLC, TDD, MVC, CQRS, and microservices architecture. Has developed scalable applications using C#, ASP.NET Core, React/React native, and Entity Framework, backed by a solid foundation in computer science with an MSc in Data Science and Business Analytics. Recognized for implementing efficient integrations with Central Bank systems and third-party APIs, enhancing financial technology ecosystems.
Objective-C 8yr.
API 8yr.
Swift 5yr.
IOS SDK 5yr.
Seasoned iOS Developer with 8.6+ years of experience in the IT industry, specializing in mobile application development using Swift and Objective-C. Well-versed in Cocoa Touch, iOS SDKs, and frameworks like AFNetworking, with hands-on experience using Pods and Git for dependency and version control.Strong academic foundation with a B.Tech from Kuppam Engineering College (JNTU), and a proven track record of delivering high-quality applications using MVC and MVVM architectures in Agile environments. Expertise includes BLE integration, QRCode/Barcode scanning, biometric authentication, memory management, and performance optimization.Successfully contributed to multiple enterprise-level apps, including Rinnai Central, Honda PSP, and VELYS Patient Path, improving user experience, reliability, and code efficiency across contract and full-time roles.
JavaScript 4yr.
React Native 4yr.
- A detail-oriented software engineer with 4 years of experience in web and mobile development.
- Intermediate English
- Available in two weeks
JavaScript 3yr.
React 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
React Native
React
- Software Engineer with a Computer Science and Software Engineering background, bringing over 7 years of experience in developing mobile and web applications.
- Proficient in a spectrum of technologies, including React, React Native, TypeScript, JavaScript, and modern libraries and frameworks like Redux and Expo.
- Demonstrated leadership skills as a Team Lead, with a track record in managing development cycles, CI/CD pipelines, and team coordination to ensure timely delivery of high-caliber solutions.
- Adept in various domains such as IoT, utility infrastructure, and gambling.
- Strong emphasis on agile methodologies, clean code principles, and cutting-edge technology integration to build scalable and performance-centric applications.
Schedulers
Call Handling
Professional secretary and Virtual assistant with over 3 years of industry experience across various sectors including education, entertainment, health, and business. Demonstrated abilities in managing schedules, handling communications, and providing remote administrative support to enhance operational efficiency. Proficient in research, data entry, social media management, and a suite of other administrative tasks. Offering a 10% discount to the first new client, highlighting a commitment to providing valuable and affordable services.
Facebook Auth
Dart
Kotlin
MVVM+Rx
GraphQL
Software engineer with 5+ years of experience specializing in Flutter development, adept at leading teams, and establishing development standards. Proven track record in architecting and deploying mobile apps with complex functionalities, including synchronous video players, multiple themes for whitelabel solutions, and comprehensive content management systems. Skilled in creating robust CI/CD pipelines (Codemagic, GitHub Actions) and implementing security measures aligned with backend infrastructures. Proficient in native plugin development across Kotlin, Java, Swift, and JavaScript. Educational background includes ongoing studies in Analysis and Systems Development, with strong problem-solving and team leadership abilities.
Java 7yr.
Kotlin 5yr.
Facebook Auth 4yr.
Node.js 4yr.
Dart
Seasoned software engineer with 8 years of rich experience in mobile and full-stack development, particularly in Flutter, Kotlin, Node.JS, and Java. Proven track record in leading development teams and designing robust software architectures, evidenced by successfully delivering a critically acclaimed MVP for a hair color mixing app and dramatically improving an international social media app's performance by 80%. Proficient in Clean Architecture, DDD, CI/CD using GitHub Actions, and efficient RX programming. Strong background in software engineering with a Bachelor's in IT Administration and an Associate Degree in Software Engineering, coupled with hands-on experience in MVC, MVVM, SOLID principles, and various design patterns. Skilled in enhancing software scalability and performance, contributing to substantial revenue growth and client satisfaction through innovative solutions.
Unreal Engine
Team Leadership
API
FDD
Software engineer with over 8 years of experience specializing in payment systems, e-commerce integrations, and both frontend and backend development. Proven track record in developing plugins for WooCommerce and Magento, creating Shopify payment applications, and constructing APIs for complex systems. Holds a B.Sc in Computer Science with a focus on Software Engineering. Proficient in PHP, Java, Go, Python, JavaScript, Bootstrap, and Tailwind CSS. Experienced in PostgreSQL, MySQL, CI/CD, and implementing monitoring and caching solutions.
Flutter 4yr.
GCP 4yr.
Firebase 4yr.
Go
* Software engineer with over 4 years of experience in mobile app development, specializing in Flutter and proficient in Dart, Kotlin, and Go.
* Strong technical expertise in building robust backend systems, REST APIs, and has a keen interest in Blockchain technology within the GCP ecosystem.
* Demonstrated ability in web development using modern technologies including HTML, CSS, JavaScript, React, and NextJs.
* Active contributor to open-source projects, enhancing the value of platforms like APIDash and GoCoin.
* Holds a Bachelor's and a Master's degree in Computer Engineering, underpinning a solid understanding of software development practices.
* Recognized for building impactful mobile applications such as Edutive for education and Racha for addiction management.
Payment Gateways 5yr.
WordPress 5yr.
Laravel 7-9 3yr.
Unity 2yr.
Ant Design 1yr.
Developer
Facebook Auth
Crashlytics
JavaScript
Slim
LCDP
An established Senior Flutter Fullstack Developer with over 20 years of experience in software engineering, boasting a strong technical background with a B.Sc. in Mathematical Physics. This engineer has specialized in cross-platform app design and development since 2011, first with the JavaScript framework Titanium and later adopting Flutter/Dart in 2020. Skilled in a variety of programming technologies, notably iOS, Android, and web development, with proficiency in frontend and backend technologies such as HTML/CSS, JavaScript, Firebase, node.js, and Python. Experienced in leading small development teams, this developer brings advanced knowledge in state management, API integration, and full-circuit backend system creation. The developer's commitment to quality and expertise in a diverse range of software methodologies and architectures is demonstrated by a history of successful projects in multiple business sectors, including fintech, healthcare, education, and animation.
Android APIs 4yr.
Swift 1yr.
ARCore
Jetpack Compose
Seasoned Android Developer and emerging iOS Developer with over 6 years of specialized experience in Android and over 1 year in iOS platform development. Expert in AR/3D reconstruction, excelling in Jetpack Compose, ARCore, and Open3D technologies, distinguished for advancing mobile systems and enhancing app performance. Proven track record in delivering cross-platform solutions, effectively managing app lifecycles, and leading development of AR-based applications. Recognized with an award for quality delivery and holds a Master's degree in Computer Applications, underpinning a strong technical foundation in mobile app development. Certified in Professional Scrum Master I, reflecting a deep understanding of Agile methodologies and software development best practices.
FDD 6yr.
React
Vue.js
Ext JS
Senior Software Engineer with over 6 years in full-stack development and technical leadership. Specializes in the MERN stack, excelling in React.js, Node.js, and modern web technologies. Adept in architecting scalable solutions, microservices architecture, and utilizing DevOps practices such as Docker and Kubernetes. Instrumental role in projects like a customizable Hotel TV Application Platform and a GPS-enabled Golf Cart Navigation System. Proven experience in Agile/Scrum methodologies and mentoring developers. Notably led teams to enhance application performance and design secure, innovative systems for various industries.
Kotlin 6yr.
Java 5yr.
Android APIs 5yr.
Jetpack Compose 4yr.
Project Management 2yr.
Engineer with a B.Sc. in Mobile Development and over 4 years of hands-on experience in Android development, exhibiting a strong command of Kotlin, Jetpack Compose, and modern software engineering practices. Demonstrated expertise in app architecture modernization, reducing build times by 40%, enhancing app stability with comprehensive testing, and leading migration to scalable, modular architectures. Proven track record of impactful project management, having developed 600+ public-safety apps, and improved essential communication tools with a robust VoIP/messaging suite resulting in a substantial increase in user satisfaction. Competent in cross-functional team leadership, Agile methodologies, and continuous integration/delivery systems, making them a valuable asset for cutting-edge software development teams.
JavaScript
TypeScript
React
React Native
Node.js
- Experienced Software Engineer with over 3 years at Securiti and prior engagement at Unique Software Development and KoderLabs, showcasing a strong engineering background and hands-on experience in contemporary software development practices and technologies.
- Proficient in JavaScript, TypeScript, React, React Native, Node.js, Nest.js; knowledgeable in MERN Stack, SQL, NoSQL, Azure, and skilled in managing software development life cycle (SDLC) in Agile environments.
- Demonstrated technical expertise through multiple project deployments on Android and iOS platforms, and adept in employing Test Driven Development with tools such as Jest for ensuring high-quality software.
- Bachelor of Science in Computer Software Engineering reinforcing a sound understanding of computer science fundamentals, paralleled by practical application in predictive analytics within the oil and gas industry.
- Valuable contribution to AI-powered cybersecurity solutions, enhancing privacy compliance through PRIVACI.ai platform development at Securiti, with focus on automation and scalability.
- Efficient in Agile software development, with capabilities in Clojurescript, parallel computing, and various programming methodologies, principles, paradigms, and patterns.
Illustration and icons 20yr.
Swift 5yr.
Objective-C
C++
- iOS software developer with 10+ years of experience. Participated in developing an architecting different iOS applications: from iOS AVFoundation players to iPad book readers, from hospitality and Digital Key experience to VPN and security (privacy) applications.
- Comprehensive knowledge of core iOS frameworks, excellent hands-on experience in CI/CD
pipelines setup, Unit testing and UI prototyping. I have complete knowledge of Apple development guidelines and put 20+ applications to the AppStore.
- Strong team player: Always set the product’s needs and team’s goal at the topmost priority. Occupied team leader positions and have lead my teams to growth, and have proven leadership experience.
- The scope of professional interests is in between cutting edge technologies: from modern REST API stack technologies to networking, from big-data and machine learning to computer vision applications.
- Work expectations would perfectly match with iOS application development and architecting; taking a part in prototyping of UI/UX with technical expertise; leading the team and perform technical expertise of any level. The main goal is to develop robust, advanced and feature-full applications for the world-wide auditory.
- Upper-Intermediate English
Android 7yr.
Flutter 3yr.
Java
Kotlin
- 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
LCDP 5yr.
Play Framework 5yr.
Swift 5yr.
Objective-C 5yr.
Kotlin
Senior Mobile Application Engineer with 17+ years of experience specializing in cross-platform mobile applications and SDKs. Expert in a wide range of frameworks and languages such as Capacitor, React, Next.js, React Native, Ionic, Flutter, Swift, Objective-C, Kotlin, Java, and proficient in CI/CD practices including Fastlane and GitHub Actions. Demonstrated ability in optimizing app performance, implementing push notification engines, and deploying production apps. Strong focus on secure, scalable API integration and backends, with a history of reducing project timelines through reusable components. Committed to agile methodologies and collaborative team environments, this engineer reflects a superior blend of technical prowess, industry insight, and hands-on experience across fintech, automotive, and healthcare sectors.
Swift 3yr.
Python 3yr.
XCode 3yr.
- Full-stack iOS Developer with over three years of experience, specialized in Swift, Python, and Xcode, with a successful track record of designing, developing, and launching high-quality iOS applications.
- Demonstrated expertise in the complete app development lifecycle, skilled in UI/UX design, front-end coding, back-end integration, and database management.
- Extensive 11-year background as a Data Analyst, proficient in data visualization, econometric modeling, and using tools like Stata, EViews, and Python to deliver data-driven solutions.
- Strong foundation in various statistical techniques and models, including ARDL, Spatial Autocorrelation, Probit and Multinomial Logit regressions, and VECMX model.
- Proven experience in project management, including conducting feasibility studies for PPP projects, and an adept understanding of risk assessment and stakeholder collaboration in the economic sector.
- A well-rounded educational background with a Master of Arts in Economics and a Bachelor of Arts in Economic Informatics, graduating with honors.
Java 6yr.
Android 5yr.
Kotlin 3yr.
- Over 5 years of expertise as an Android developer specializing in Kotlin. Experienced in leading and collaborating with development teams to ensure successful project delivery.
- Skilled in introducing new functionalities, transitioning projects from Java to Kotlin, and adhering to WCAG accessibility standards.
- Proficient in software architecture, quality assurance, and agile methodologies. Also experienced in Java software engineering, web development, and instructional roles.
- Comprehensive understanding of Android UI/UX principles, clean architecture, and a range of libraries and tools.
- Solid proficiency in Java, Kotlin, RxJava, Coroutines, Android Jetpack, Firebase, REST APIs, and various development and debugging tools.
- English proficiency at an upper-intermediate level.
Available to start immediately.
Delphi 25yr.
SQL
Visual Basic
Pascal
Software engineer with over 25 years of development experience, possessing extensive expertise in Delphi (VCL/FMX) and database management across various sectors. Notable for implementing performance-focused custom applications, this engineer's technical proficiency also spans C#, Visual Basic, SQL, and multiple database systems. They have a strong track record in system administration and IT support, having worked with reporting tools like Crystal Reports. Holds a Diploma in Computer Program from BIG SERVICE, showcasing a solid foundation in computer science.
$40/hr
$5000/month
$5000/month
iOS 11yr.
Swift 5yr.
Objective-C 5yr.
Java 3yr.
Spring Boot 3yr.
Expert with iOS swift/ Objective C development
Nearly 2 years experience on Java Spring Boot development
React
React Native
JavaScript
TypeScript
- 7+ years of expertise in frontend and mobile development with a strong command of ReactJS, React Native, and TypeScript, delivering scalable cross-platform applications.
- Proven leadership in architecting solutions, leading React/React Native teams, and driving technical decisions aligned with product and design goals.
- Hands-on experience with modern web and mobile technologies, including Next.js, Redux, REST API, GraphQL, and native Android/iOS modules.
- Skilled in CI/CD pipelines, code quality tools (Eslint, Prettier, SonarQube), and testing frameworks (Jest, Detox, Playwright), ensuring robust software delivery.
- Master’s degree in engineering from a technical university, with a solid foundation in software development lifecycle, Agile methodologies, and responsive, accessible UI design.
React Native 5yr.
JavaScript 5yr.
TypeScript
- 5+ years of expertise in React Native development, specializing in cross-platform UI architecture, Redux state management, and native module integration.
- Proven leadership in managing complex projects, including award-winning apps, with strong skills in asynchronous workflows using Redux Saga and real-time data sync via Firestore.
- Skilled in integrating payment systems (Stripe, PayPal, RazorPay), location services, push notifications, and offline data persistence using SQLite, Realm, and AsyncStorage.
- Experienced in building user-centric solutions for diverse domains such as crisis communication, legal reference, and sports coaching, leveraging Context API, full-text search, and analytics dashboards.
- Holds a Bachelor in Computer Engineering, proficient in JavaScript, TypeScript, and modern development tools (VS Code, Android Studio, XCode) across MacOS, Windows, and Linux environments.
.NET Core 8yr.
TypeScript 6yr.
React 6yr.
React Native 6yr.
Node.js 6yr.
- Full-stack engineer with 6+ years of expertise in TypeScript, React, React Native, Node.js, and .NET Core, delivering scalable B2B and healthcare applications with 40% latency reduction through query optimization.
- Proficient in integrating analytics SDKs (Mixpanel, Firebase, AdMob) and implementing secure JWT authentication and role-based access control in cross-platform mobile apps.
- Experienced in CI/CD pipelines using GitLab CI/CD, automated testing (Jest, Cypress), and cloud deployments on AWS and Docker, enabling rapid iterative releases and A/B testing.
- Strong background in SQL databases (PostgreSQL, MySQL, SQL Server) with advanced query optimization for analytics-driven growth metrics.
- Holds an MSc in Computer Science and IT, skilled in modular architecture, feature flags, and AI-augmented development to accelerate coding and improve UX flows.
JavaScript 5yr.
Node.js 5yr.
React 5yr.
Vladyslav S. is a Senior JavaScript Developer with 6+ years of experience specializing in React.js, React Native, and Node.js. Experienced with AWS services (Lambda, ECS, RDS, DynamoDB), Firebase, Terraform, and CI/CD pipelines (GitHub Actions, Docker). Proficient in REST APIs, state management (Redux, MobX), and modern frontend frameworks like Next.js and Angular. Strong team collaborator with clean code practices and a focus on scalable architecture.
Swift 6yr.
UIKit 6yr.
RxSwift
Combine framework
Crashlytics
Senior iOS Developer with over six years of experience in developing high-performance mobile applications. Expertise in designing scalable architectures such as VIPER, MVVM, and Redux and in optimizing app performance through in-depth profiling and code refactoring. Proven track record of improving messaging app stability by 20%, reducing memory usage by 30%, and enhancing fin-tech app user interfaces with custom UI components and animations. Delivered an innovative Bluetooth mobile app, enhancing building time by 25% and memory usage by 15%. Proficient in Swift, UIKit, RxSwift, Combine, Firebase, and Mapbox, with the ability to collaborate seamlessly with cross-functional teams. Possesses an advanced level in English and a strong grasp of various development frameworks and tools.
Facebook Auth 3yr.
Dart 3yr.
A seasoned software engineer with 3 years in mobile development, specializing in Flutter and possessing a strong foundation in Java full stack technologies. Spearheaded development of sophisticated mobile applications including fintech and social media platforms, notably integrating third-party services like Plaid and implementing real-time tracking systems. In addition to solid UI/UX design skills, boasts proficiency with Spring MVC, Hibernate, and MySQL, complemented by full-stack Java development training. Holds a Bachelor's degree in Computer Science and has contributed to open-source projects, showcasing practical expertise in a variety of technical environments. A proven track record of architecting robust applications and optimizing performance through advanced programming techniques and methodologies.