Hire Vetted Design and Creative Engineers at Upstaff - Page 1
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
Operations and Cloud
Mobile Application
Digital Platforms
Blockchain
Design and Creative
Quality Engineering and Testing
Delivery Management and Analytics
Desktop Software
Writing and Translation
Marketing and SEO
Scripting and Automation
Embedded Systems
Low-Code
GameDev
Industrial Engineering
Python 5yr.
Django 3yr.
Mobile development
Flask
API
- Python Developer with 5+ years of experience in backend development and automation: Django (3 years), Flask, and Fast API for web application development;
- Maintaining and supporting production systems using FastAPI and SQLAlchemy, API integrations including financial services and crypto platforms;
- Built and supported Telegram bots and automation tools for business operations;
- Docker containerization: Docker-compose, Docker via Render (serverless). Deployment and Linux server management (Ubuntu);
- Familiar with data reporting and basic analytics through internal monitoring tools;
- Open to part-time and distributed team environments with a focus on ongoing system support.
- Reached the Top 10 freelance Python engineers on the local market at the age of 17 (showcasing early
talent and initiative).
- Worked on projects with a multi-million user base, contributing to scalable architecture and high-load system stability.
- Successfully launched an educational platform in the USA, now actively used by students, tutors, and academic institutions.
- Represented the dev team at the international Wefi Beyond Banking Summit, delivering a product presentation to a global fintech audience.
Middle
Ternopil, Ukraine
Objective-C 10yr.
iOS 10yr.
C++ 10yr.
Swift 5yr.
- Served as a Senior Software Developer in the Two German Automotive Navigation Projects, focusing on System Team operations as well as Map and Routing domains.
- VPN and Network Filtering Development: Extensive experience developing VPN solutions, including cross-platform engines for KeepSolid’s VPN Lite, and expertise in low-level network filtering, proxies, and handling internet traffic.
- iOS Development Expertise: Over 10 years of hands-on experience with iOS development, including business apps and secure communication tools, with proficiency in Swift and Objective-C.
- C++ Proficiency: Strong background in C++ for developing core network functionalities, optimizing performance, and building cross-platform applications.
- Enterprise Application Development: Skilled in developing enterprise-level applications, including parental-style internet filters and device policy management tools.
- Agile Methodologies: Proven track record of working in Agile Scrum environments, delivering high-quality software with fast iteration and strong collaboration.
- Leadership and Team Collaboration: Experience as a Tech Lead, mentoring teams, and coordinating with stakeholders to resolve issues and implement new features.
- Available to start ASAP
Expert
Odesa, Ukraine
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
$32/hr
UI/UX
- UI/UX designer with more than 7-year experience in providing customized design solutions for complex SaaS, B2B, B2C products and mobile applications, introducing only the highest level of UI/UX in each project.
- My philosophy is to provide a quality product in the most efficient manner. I always adhere to my development stages in creating a product. You will not get work that is done poorly and you will not have to change it.
- I always hear and understand what the customer wants, so you don’t have to spend a hundred hours explaining what your product requires.
- Quick learner, team player, goal-oriented and responsible
-Intermediate+ English
- Availability starting from 01.09.2023
Senior
Kharkiv, Ukraine
JavaScript
Bootstrap 4
Python
Software engineer with over 3 years of professional experience at COMSATS University Islamabad, specializing in Python, Django, and JavaScript. Notable for developing a complete Queue Management System to enhance university operations. Expert in Bootstrap, assisting with UI/UX design, backend logic, and data management. Proficient in conducting quality assurance and regression testing on complex web applications such as the Student Fee Management System. Holds a diploma in Graphic Design, contributing to a strong foundation in UI/UX principles. Capable of translating departmental requirements into effective technical solutions and maintaining system reliability for various university system modules.
Junior
Islamabad, Pakistan
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.
Senior
Birmingham, United States
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
HTML 10yr.
CSS 10yr.
TypeScript
WCAG
Angular
With over a decade of specialized experience in frontend development and accessibility engineering, this candidate stands out for their expertise in creating inclusive digital environments compliant with WCAG standards. Their deep understanding of user-centric design is reflected in their proficiency with HTML, CSS, TypeScript, and modern frameworks such as Angular and React. They have a proven track record in performing detailed accessibility audits, leveraging assistive technologies and testing tools to enhance project compliance with European and international laws. The candidate's front-end development experience is complemented with practical proficiency in using ARIA patterns, semantic HTML, and establishing keyboard navigation practices. Their portfolio includes close collaboration with cross-functional teams to successfully implement fixes and features that significantly improve user accessibility, ensuring rigorous adherence to accessibility audits and VPAT documentation.
Expert
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
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.
Expert
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
AI/ML
ML
Python
Results-driven AI/ML Engineer who transforms data into actionable business insights. Led development of recommendation systems that increased user engagement by 35% and fraud detection models that reduced financial losses by $2M annually. Expert in building scalable ML infrastructure and cross-functional collaboration, with experience managing full ML lifecycle from research to production deployment. Combines strong technical expertise in Python, PyTorch, and cloud technologies with business acumen to deliver measurable ROI through AI solutions.
Senior
United Kingdom
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.
Expert
Winchester, United Kingdom
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
Backbone.js 9yr.
TypeScript 8yr.
SQL/NoSQL 3yr.
Express 3yr.
AWS 2yr.
10+ years of experience in web development, M.Sc in Software Engineering, GAI, LLMs
Front-End: Angular, React, Vue.js (JavaScript & TypeScript)
Back-End: Node.js, Next.js, TypeScript , PHP
Mobile: React Native
AWS Cloud infrastructure
Control systems (e.g., Git) and familiarity with DevOps practices for continuous integration and deployment (CI/CD).
Unit testing, integration testing, and end-to-end testing.
Experience leading and mentoring a team of developers, including assigning tasks, providing guidance, and ensuring the team's success. Ability to motivate and inspire team members, resolve conflicts, and provide constructive feedback.
Experience conducting assessments and interviews remotely.
Expert
Lagos, Nigeria
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
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.
Senior
Bengaluru, India
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