Hire Vetted Design and Creative 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.
Design and Creative
All
Web Application
Data and Analytics
Cloud and Operations
Mobile Application
Digital Platforms
Blockchain
Design and Creative
Quality Assurance
Project Management
Desktop Application
Writing and Translation
Scripting and Automation
Marketing and SEO
Embedded Systems
Low-Code and No-Code
GameDev
Industrial Engineering
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.
Senior
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.
Senior
Sirhind, India
Facebook Auth 5yr.
Dart 5yr.
Power BI 5yr.
Apache Hive 5yr.
Crashlytics 5yr.
Senior Software engineer with over 5 years of experience specializing in Flutter development for cross-platform mobile apps. Mastery in architecture patterns like MVVM, MVP, BLoC, and Clean Architecture, combined with advanced skills in Dart, Flutter, Firebase, and WebRTC. Demonstrated capability in building complex real-time communication applications and ensuring data security aligns with OWASP guidelines. Adept in state management using BLoC, Provider, and Riverpod, and proficient in development tools like Visual Studio Code, Android Studio, Git, and Flutter Inspector. Significant experience with database technologies like Hive, SQFlite, and Firestore, and contributions to enterprise-level projects ensuring performance optimization and crash-free user experiences.
Senior
Reverse Engineering
React Native
Android APIs
iOS
• 6+ years of experience in reverse engineering and security analysis of iOS and Android applications, including authentication, password reset, OTP, and account recovery flows;
• Experience with static and dynamic analysis using Frida, JADX, IDA/Ghidra, Hopper, Burp Suite, and mitmproxy, including hooking runtime behavior, traffic interception, and analysis of obfuscated code paths;
• Understanding of network protocols, API behavior, session handling, token flow inspection, and secure communication patterns in mobile systems;
• Skilled in bypassing anti-debugging protections, inspecting native components, and analyzing undocumented logic in React Native, Swift, Kotlin, and mixed-architecture apps;
• Experienced of mapping complex authentication workflows, documenting mobile security mechanisms, producing technical reports, diagrams, and vulnerability-focused flow descriptions;
• Experience optimizing backend/mobile integrated flows with PostgreSQL, caching, throttling, and performance tuning in high-load financial and administrative mobile apps;
• Skilled in mobile application security analysis across fintech, art commerce, and critical operations platforms, including real-time traffic inspection and security hardening;
• Effective communicator with experience collaborating with product, operator, and engineering teams through RFCs, status updates, and structured documentation.
Senior
Ukraine
Java SE
Kotlin
Android
Android developer with a strong foundation in software engineering, holding a Bachelor's Degree in IT and Software Engineering, and boasting over 4 years of professional experience. Expertise in Java SE, Kotlin, and Android SDK underscored by proficiency in MVVM, MVP, and Clean Architecture, ensuring scalable and maintainable code. Adept in modern Android development tools like Jetpack Compose and Navigation Component, coupled with mastery in Networking & APIs like Retrofit 2 and Stripe API. Demonstrated abilities in asynchronous programming using Kotlinx Coroutines, and commitment to quality through rigorous test case development. Proven track record in contributing to all phases of the SDLC in various projects, from user interface implementation to application deployment for mobile and Android TV platforms.
Middle
Ukraine
Android APIs 5yr.
LCDP
Microsoft Power Platform
Software engineer with hands-on experience in Android development, boasting a solid engineering foundation with a Bachelor's degree in Business Informatics. Demonstrates proficiency in multiple architectures, including MVVM and MVP, and technical fluency in Kotlin, Java, and Android Studio. Known for contributing to complex projects using tools like Dagger2, RxJava, and Realm, and adept at optimizing app performance and integrating third-party libraries. Played a key role in the development of applications in sectors such as e-commerce, delivery, and CRM, leveraging sound knowledge in material design guidelines and handling API interactions. Emphasizes a thorough understanding of project management and SDLC, with a strong ability to lead and collaborate within cross-functional teams.
Middle
Tirana, Albania
HTML5
CSS3
JavaScript
Software engineer with 10+ years of experience in UI development and a strong proficiency in web technologies including HTML5, CSS3, JavaScript, and modern JS frameworks such as Angular and React.js. Proven track record of leading technical teams and managing end-to-end development cycles using Agile methodologies. Skilled in tackling complex problems with microservice APIs, Spring Boot, and cloud integration with AWS. Recognized for enhancing product user experience and system architecture through rigorous debugging and testing practices. Holds a B.Tech in Computer Science and multiple Coursera certifications. Advanced knowledge of dev ops tools and version control systems, excelling in fast-paced environments.
Expert
India
NativeJS 15yr.
Play Framework 5yr.
Firebase Cloud Messaging
CI/CD
- Senior Mobile Engineer with 17+ years of experience, focusing on cross-platform mobile application development and SDKs.
- Expertise in various mobile frameworks (Capacitor, React, React Native, Ionic, Flutter) and native (Swift, Objective-C, Kotlin, Java).
- Proficient in CI/CD practices (Fastlane, GitHub Actions, Jenkins), automated deployments, push & messaging tech (APNS, FCM, Courier).
- Strong background in backend and API development, including REST, GraphQL, serverless architectures, along with performance optimization.
- Demonstrated ability in fostering agile methodologies and working with multi-timezone teams to drive project success.
- Holds a BSc in Computer Software Engineering from Sofia University, reflecting a strong technical foundation.
Expert
Sofia, Bulgaria
Python 5yr.
TypeScript 5yr.
C/C++/C#
Robot Framework
Dart
Software engineer with a strong focus on AI integration and full-stack web solutions. A proven track record in building AI-powered tools and automating core processes, coupled with expertise in cross-platform development and containerization. Extensive experience with Python, Docker/Nginx, and deploying reliable APIs. Actively pursuing a Bachelor's in Computer Science and excelling in hands-on roles such as Software Research Engineer. Achievements include reducing log review time by 70% and improving customer agents' response rate from 45% to 85%. Adept in languages like C/C++, JavaScript/TypeScript, and possesses advanced skills in frameworks like Django and ReactJS.
Middle
Lagos, Nigeria
Dart
Crashlytics
GetX
Software Engineer with over 4 years of specialized experience in Flutter development, proficient in Dart and well-versed in state management techniques including GetX, Provider, BLoC, and Redux. Highly skilled in building scalable mobile applications with robust data management solutions using Firebase, Firestore, and SQLite, while adhering to MVC and MVVM architectural best practices. Successfully developed and deployed 25+ Android and iOS apps to the app stores, implementing real-time authentication and synchronization features. With a solid academic background holding a Bachelor’s in Computer Application and currently pursuing a Master’s in Computer Applications, I bring both strong technical expertise and a continuous learning mindset. Recognized in senior roles at tech firms for leading projects like Surat Jugaad Plus and Pensive, I have consistently demonstrated problem-solving, debugging, and delivering user-centric applications that scale.
Middle
Dart 5yr.
Flutter 5yr.
Software engineer with 5+ years of experience specializing in Flutter application development for a variety of industries, including finance, real estate, and governmental disaster management. Demonstrated expertise in both mobile and web development with a solid foundation in computer science, holding a Bachelor's degree in Informatics Engineering. Proficient in key technologies such as Dart (Flutter), React-Native, and Cordova, with a focus on both frontend and backend development. Adept at collaborating in team environments and employing Agile and waterfall methodologies, the engineer has a strong track record in developing applications that address complex requirements. Proficient in state management (BLoC, GetX) and integrating services such as Firebase and RESTful APIs. The candidate brings a combination of technical acumen and practical experience, poised to make a significant impact on future projects.
Middle
South Tangerang, Indonesia
Python
Dart
JavaScript
Figma
Microsoft Visual Studio Code
Software engineer with practical experience in mobile and web development, specializing in Flutter and familiar with state management tools like Provider. Demonstrated expertise in creating user-friendly interfaces and features, as reflected in projects such as a pharmacy management system and a comprehensive food delivery app. Collaborates effectively in agile environments, with a history of successful team-based project completions. Strong foundation in computer science from Jimma University, equipped with skills in Python, Dart, JavaScript, and a range of development tools including Figma, VS Code, and Git. Proficient in the use of Firebase for building scalable apps with real-time data, emphasizing clean code practices and responsive design principles. Proactive in acquiring user feedback to refine product functionality.
Intern
Git 5yr.
Python
Dart
Agile
Software Engineer with 5+ years of full-stack development expertise, specializing in mobile and backend technologies. Proven ability to deliver 20+ applications across Android and iOS, utilizing languages such as Python, JavaScript, Dart, and Java coupled with proficient use of frameworks like Django, Node.js, and Flutter. Demonstrates strong proficiency in database management with PostgreSQL, MySQL, MongoDB, and Firebase, and excels in setting up CI/CD pipelines and employing Agile methodologies for efficient deployment and iteration. Holds a BSc in Computer Science from Maseno University and is known for sophisticated leadership and team mentorship capabilities, contributing to key projects like Kenya's Government Digital Services and the CapitalPay fintech platform.
Senior
Nairobi, Kenya
Dart 4yr.
Bloc 4yr.
Crashlytics 4yr.
Senior Software Engineer with a solid 4 years of experience delivering mobile apps, including both the creation of new applications and enhancement of existing solutions. Core competencies involve Flutter development, with strong proficiency in Dart, and experience with various architectural and design patterns. Accomplishments include leading app development for diverse domains such as E-Government, E-Commerce, and FitTech. Technical strengths are underpinned by expertise in memory profiling, performance tuning, implementing authentication mechanisms using JWT, and creating plugins. Skilled in SDLC and software development best practices, with a significant emphasis on distributed tracing techniques to elevate app reliability.
Middle
Tashkent, Uzbekistan
Dart 2yr.
Facebook Auth 2yr.
Clean Architecture
MVVM
Packet Tunnel Provider
Software engineer with specialized expertise in Flutter development for multi-platform applications. Experienced in leading cross-functional teams and optimizing app performance, with hands-on experience in architecture and advanced project management systems. Technical proficiency in Dart, along with familiarity in C++, JavaScript, TypeScript, and a variety of Flutter frameworks and architectures. Proven record in developing high-traffic, secure applications with a focus on user experience, contributing to substantial growth rates in user base and sales. Strong foundation in computer science with a biotechnology and pharmacy degree, underpinned by effective problem-solving skills showcased through the completion of 200+ Leetcode problems.
Middle
Alexandria, Egypt
Java 4yr.
RESTful API 3yr.
Android App Development 2yr.
Spring Boot 2yr.
SQL 2yr.
Software Engineer with over 4 years of experience at Tacktile Systems, excelling in full-stack Java and Android development, database optimization, and AI-enhanced productivity. Proficient in developing secure, performant RESTful APIs, and dynamic web reporting tools. Innovates using AI tools such as ChatGPT and Cursor AI to expedite development processes. Demonstrates expertise in Java, Spring Boot, RabbitMQ, SMTP2GO, Sentry, JSP, AJAX, JavaScript, and Android SDK, Code Refactoring, MVVM architecture ensuring robust and scalable software solutions.
Middle
FDD
JavaScript
React Native
Seasoned Mobile App Developer with over a decade of experience, specializing in UI/UX design, native mobile app development, and AI-driven applications. B.Tech in IT from Delhi Technical University and possesses significant freelance success with 10,000+ hours on Upwork. Entrepreneurial background includes co-founding two startups, with a notable exit from a peer-to-peer lending platform. Strong technical proficiencies in JavaScript, React Native, and web development with certification in Full Stack Web Development. Adept in enhancing product value through integration of advanced features like 3D animations and Bluetooth device connectivity. Demonstrated expertise in SDLC and modern development practices, catering to a diverse clientele with over 30 mobile app projects delivered.
Expert
WCAG
Quality Assurance
This engineer brings a robust background in web accessibility and compliance, with a strong focus on creating inclusive and user-friendly digital products. Key highlights include proficiency in conducting comprehensive accessibility audits to ensure WCAG 2.1 AA and Section 508 compliance, as well as substantial hands-on experience managing the full defect lifecycle for accessibility issues. Beyond technical skills, this candidate shows a keen ability to drive organizational change through the creation of end-to-end accessibility processes, evidenced by the successful remediation of thousands of accessibility defects. This profile stands out for a combination of technical expertise within the web compliance domain, a proven track record of leading accessibility initiatives, and a thorough understanding of the accessibility requirements that shape exceptional UI/UX design.
Senior
Kissimmee, United States
RESTful API
JavaScript
TypeScript
Seasoned Product Manager and former Research Staff with extensive IT experience, specializing in accessibility and adept in modern programming languages and tools. Notable for leading the development of assistive technology products and contributing to inclusive technology initiatives. Proven experience in API optimization, problem-solving in server-client communication, and enhancing application security using Azure Key Vault. Strong educational foundation with a Bachelor of Engineering in Computer Science and an MBA in Systems. Recognized for technical leadership, strategic project management, and analytical prowess in high-stakes environments.
Expert
Hyderabad, India
WCAG
Usability tests
Azure
SLDS
ARIA
- Accessibility SME with DHS Trusted Tester and NVDA certifications and an IAAP CPWA credential, possessing over a decade of accessibility consulting experience.
- Deep expertise in WCAG, Section 508, and ADA compliance, as well as in utilizing and testing with major assistive technologies like NVDA, JAWS, VoiceOver, and TalkBack.
- Extensive background in developing and implementing accessibility standards, including Microsoft Accessibility Standards (MAS) and design systems for inclusive user experiences.
- Proficient in web, mobile, and desktop application testing across various platforms (iOS, Android, Windows, macOS) and in leveraging assistive technologies for accessibility testing.
- Proficient in front-end technologies including ARIA, HTML, CSS, JavaScript, and skilled in conducting both manual and automated testing with tools such as axe, Lighthouse, WAVE.
- Holds a B.A. in Home Economics with an A.S. in Computer Science, reflecting a strong foundation in both technology and systematic problem-solving.
Expert
United States
React Native 5yr.
React 5yr.
TypeScript 5yr.
JavaScript 5yr.
Redux 5yr.
Accomplished Software Engineer with 5 years of in-depth experience in mobile and software development primarily focused on React Native, ReactJS, and TypeScript. Demonstrated proficiency in leveraging advanced JavaScript technologies such as Redux and ES6 to build robust mobile applications. Led a technical team and mentored engineers in creating market-centric apps and websites, ensuring adherence to best practices in software development. Key project contributions include the implementation of react-native-firebase for notifications and analytics, and development of complex features for barcode and RFID reader applications. The engineer's academic background in Information Technology fortifies their technical expertise, and a penchant for continuous learning in mobile programming underpins their evolving mastery of the software engineering domain.
Senior
Yerevan, Armenia
SDLC 3yr.
Node.js 3yr.
JavaScript 3yr.
SQL 3yr.
NoSQL 3yr.
Versatile software engineer with a Bachelor's degree in Computer Engineering and Technology eager for defense from United Methodist University in Mozambique. Showing 3 years of real-world experience with expertise in software development and technical support. Proficient in contemporary web and mobile development, this engineer has successfully built and maintained applications using Node.js, JavaScript, and optimized SQL and NoSQL databases. Technical acumen extends to mobile app creation using React Native and Ionic, as well as comprehensive data analysis utilizing Power BI. Recognized for contributing to collaborative product design and exhibiting strong problem-solving skills. Skilled in an array of programming languages and tools including Python, JavaScript, C++, Git, and more; this candidate stands out for their dynamic approach and adaptability to new technologies, ready to bring value through strong software development practices.
Junior
Maputo, Mozambique
HTML
CSS
JavaScript
PHP
Bootstrap 3
A dynamic Full Stack Developer and Video Editor with over 2 years of experience in web development and video editing. Expertise in creating responsive websites and fine-tuning video content utilizing an array of technologies including HTML, CSS, JavaScript, PHP, and Python. Proven ability to manage e-commerce projects like 360cartmall.com, showcasing capabilities in UI/UX and back-end development. Agile in developing solutions with modern frameworks and tools such as React, Visual Studio, and XAMPP. Holds a Bachelor’s in Software Engineering, underpinning a solid technical foundation. Adept at translating complex requirements into user-centric designs and functionalities, reflecting a strong background in SDLC and software development best practices.
Middle
React Native 6yr.
React 1yr.
UI/UX Design
Accomplished Senior Software Engineer with expertise in mobile development, including a leading role in architecting and optimizing a housing support application, ensuring an enhanced user experience. Bring years of experience with a strong focus on ReactJS and React Native across multiple organizations, elevating OPS dashboards, modernizing legacy code, and contributing to a variety of successful app releases. Holds a BSc in Computer Science from the British University in Egypt, marrying technical skills with solid theoretical knowledge. Renowned for implementing new technologies, refining development standards, and delivering high-quality software solutions. Proven capability in the full app lifecycle management and team leadership, aiming to drive efficiency and innovation in software development.
Senior
Riyadh, Saudi Arabia
WordPress 9yr.
Shopify 9yr.
Preact 7yr.
Next.js 6yr.
Web3 6yr.
Accomplished Senior Web & Mobile App Developer with a robust educational foundation, holding a Bachelor of Science in Computer Science from the University of California, Berkeley. Possesses extensive experience with a tenure from July 2020 to August 2023 at Tech Innovators Inc., where contributions led to a 30% increase in user engagement for a million-user cross-platform app. A tenure as a Full-Stack Developer at Creative Solutions Ltd. from June 2016 to February 2020 resulted in a marked 25% client satisfaction increase. Expertise in a broad spectrum of technologies including WordPress, Shopify, PHP, React.js, Node.js, Android, React Native, and cloud platforms like Google Cloud and AWS. Strong ability in web scrapping, API integration, and database optimization. Proven track record in leading projects, mentoring teams, and fostering a culture of continuous improvement.
Senior
California, United States
JavaScript 5yr.
TypeScript 2yr.
Angular 2yr.
React 2yr.
Vue-bootsrap 2yr.
Software engineer with extensive experience in front-end and back-end development, proficient in Core JavaScript and DOM API as well as Angular, React, and Vue. Valuable contributor to cross-functional teams with a track record of optimizing performance and streamlining SDLC through Agile methodologies. Recognized for delivering high-quality, user-friendly software solutions that exceed client expectations and contribute to business growth. Holds a First Class Honours BSc in Information Technology and Business Information System from MiddleSex University and an Advanced Diploma in Software Engineering from Aptech, distinguished by technical rigour and a practical approach to problem-solving. Employs a combination of in-depth technical expertise in the JavaScript ecosystem, software development best practices, and continuous professional development to drive impactful innovations.
Senior
Zebbug, Malta
Swift 3yr.
Kotlin 2yr.
SwiftUI
Viper
Software Engineer with 3.5+ years of experience, specializing in iOS development with Swift and Android development with Kotlin. Proficient in leveraging frameworks like UIKit, SwiftUI, CoreData, AVFoundation, and technologies like MVVM, VIPER, and Clean Swift. Demonstrates strong proficiency in application performance, memory management, and advanced photo editing application development. Holds a Computer Engineering degree and has a solid foundation in coding principles and software development practices. Worked on notable projects involving video streaming, e-commerce applications, and organizational management tools.
Middle
WordPress 3yr.
Elementor 2yr.
Wix
WooCommerce API
Senior Web Developer with extensive experience in WordPress, WIX, and e-commerce system development. Proficient in converting designs (Figma) to functional WordPress sites and optimizing websites for SEO and usability. Demonstrated expertise in front-end development, including HTML, CSS, and JavaScript, coupled with a deep understanding of Elementor and WooCommerce. Proven track record in delivering web projects across various industries, with a focus on enhancing user experience and meeting business requirements.
Middle
Java 15yr.
Flutter 5yr.
Kotlin 5yr.
- Mobile software developer with over 15 years of extensive experience in designing, architecting, and developing mobile applications for Android and iOS platforms using Flutter, Kotlin, Java, and React Native.
- Skilled in Clean Architecture, cross-platform solutions, and native development.
- Proven track record of leading mobile development teams for fintech, investment, and subscription-based platforms.
- Expertise in overseeing end-to-end project execution, including architecture design, feature implementation, testing, and delivery.
- Proficient in building SDKs for hardware sensors, smartwatches, and other devices, with capabilities such as BLE communication, data parsing, OpenCV integration, and real-time data synchronization.
- Specialized in developing healthcare and assistive communication applications with features like speech-to-text, word prediction, handwriting recognition, and customizable UI/UX for individuals with disabilities.
- Experience in building interactive games for Android devices and smartwatches using frameworks like libGDX and AndEngine, with added functionality for integrating external sensors.
- Strong expertise in optimizing application UI/UX, working with images and video streams, and enhancing application performance through efficient coding practices.
- Skilled in integrating cloud services (AWS, Dropbox API, Parse) and building backend solutions for data storage, synchronization, and real-time updates.
- Hands-on experience in implementing automated testing, improving code quality, and ensuring seamless application performance across devices.
Expert
Poland
Facebook Auth 6yr.
Dart 6yr.
Swift 6yr.
UIKit 6yr.
SwiftUI
Seasoned Senior Mobile Developer with 6 years of experience, specializing in native iOS (Swift, UIKit, SwiftUI) and cross-platform (Flutter) mobile app development. Demonstrated expertise in full lifecycle project management, architecting robust app solutions with a focus on the Blockchain, Transportation, Education, HealthCare, and E-commerce sectors. Proficient in leveraging modern development tools, such as Alamofire, Core Data, and Combine. Effective at leading and mentoring teams, directly engaging with clients, and contributing to high-quality software with experience in SDLC, MVVM, Agile methodologies, and CI/CD pipelines. Recognized for refactoring and optimizing codebases for scalability and performance.
Senior
Lviv, Ukraine
React Native 3yr.
Mobx 3yr.
Front-End Web Development 3yr.
Mobile Application Development 3yr.
With over three years of professional experience, the React Native developer has a strong foundation in mobile application development, demonstrating expertise in state management with MobX. They possess a track record of creating cross-platform mobile apps with a focus on responsive, seamless user experiences and have tackled projects including e-commerce and uptime monitoring solutions. As a holder of a Bachelor's degree in Computer Engineering and currently pursuing a Master's degree in Software of Computer Systems and Networks, the engineer is grounded in a solid theoretical understanding of the field. Their proficiency extends to handling platform-specific challenges and employing varied React Native packages for innovative problem-solving. Engagements in roles ranging from CEO of a start-up to front-end and mobile development showcase a breadth of leadership and technical skills.
Middle
Azerbaijan