
Cross-platform mobile apps are increasingly being built with React Native. But how can you scan for QR codes and augment the user's camera view when they're present?
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As Toptal’s CEO of Technology Services, Robert leads strategy and operations across our technical services portfolio, spanning AI, automation, and operations. He previously served as Deloitte’s Managing Director & Chief Commercial Officer, transforming its Cloud Operate and Engineering business into a multibillion-dollar operation. He held senior roles at IBM, Velocity, co-founded Corio, and was CIO for two Fortune 100 manufacturers.As Toptal’s CEO of Technology Services, Robert leads strategy and operations across our technical services portfolio, spanning AI, automation, and operations. He previously served as Deloitte’s Managing Director & Chief Commercial Officer, transforming its Cloud Operate and Engineering business into a multibillion-dollar operation. He held senior roles at IBM, Velocity, co-founded Corio, and was CIO for two Fortune 100 manufacturers.
Previously At









CEO, Technology Services
As Toptal’s CEO of Technology Services, Robert leads strategy and operations across our technical services portfolio, spanning AI, automation, and operations. He previously served as Deloitte’s Managing Director & Chief Commercial Officer, transforming its Cloud Operate and Engineering business into a multibillion-dollar operation. He held senior roles at IBM, Velocity, co-founded Corio, and was CIO for two Fortune 100 manufacturers.
Previously at
Technology Experience
35+ Years

Delivery Manager
Rachael serves as a Delivery Manager at Toptal with a focus on leading diverse global teams in developing innovative solutions for our clients. She works across multiple disciplines, including technology, marketing, and management consulting. Rachael specializes in managing people and client relationships, process optimization, and driving teams toward optimal business outcomes.
Previously Managed Client
Experience
9+ Years

9+ Years
of Experience
With nearly a decade of hands-on experience in product management, Alex has led cross-functional teams at industry giants like Google, Apple, and Expedia to bring human-centered, data-driven products to life. Grounded in a neuroscience background and bolstered by certifications from Product School and the Scrum Alliance, Alex blends behavioral insight with technical acumen to deliver innovative solutions across e-commerce, IoT, and consumer tech.
Previously at

13+ Years
of Experience
Milutin is a computer science engineer with a bachelor's degree and a senior full-stack web developer with a decade of experience working on solo and team projects. He currently focuses on Laravel and TypeScript (Angular, React, and Node.js). Milutin is also one of the creators and main developers of the tennis app (ACES TM) and recently worked on the Paris 2024 Olympics ticketing app for two years.
Previously at

11+ Years
of Experience
Paula is an award-winning UX/UI designer, advisor, and illustrator with more than 11 years of hands-on experience in making complex interfaces delightful and user friendly. She has made a significant impact in large corporations, such as Amazon, Zillow, Google, as well as startups. Her mission is to create efficient, beautiful, innovative, and high-quality experiences for the greater good of society.
Previously at

10+ Years
of Experience
Stephen is a senior full-stack engineer with over ten years of experience. He has five years at Meta, working on mobile video products, including Facebook, Instagram Live, and Oculus TV, and one year as a lead. He also has ten years of iOS and mobile-first development. He was a service Army Intel Analyst with a Secret Security Clearance as of 2022. He was a previous CTO and cofounder of multiple startups. He has a bachelor's in Computer Science from the University of Missouri, Columbia.
Previously at

15+ Years
of Experience
Claudiu is a senior full-stack developer with around 15 years of industry experience. He has built various projects, from marketing websites and applications for digital agencies to internal tools at Facebook, civic technology projects, and SaaS products. Claudiu is passionate about open source, developer experience, clean code, and maintainable software.
Previously at

11+ Years
of Experience
Marcus has over a decade of experience in front-end development, building React websites and developing iOS and Android apps in React Native for the past several years. He has helped at least 31 enterprises and startup clients to design and build high-quality cross-platform apps using React, React Native, and Node.js. Marcus has also built enterprise-scale apps that have impacted over 30 million users in 140 countries.
Previously at










15+ Years
of Experience
Ian is a knowledgeable product lead, seasoned marketer, and startup founder/CEO with more than a 15 years of product experience. He's worked in various capacities and led successful product teams at Amazon from C-suite presentations to writing his own MySQL queries for the data in the pursuit of making the best decisions. Ian also has an MBA from MIT, a BA from Yale, and was a Fulbright Fellow.
Previously at

17+ Years
of Experience
Zsolt has been working in technology for a number of years and moved into mobile app development in the last 4.5 years with React Native. He is still interested in computer vision related solutions and desktop software with C++ and C. His previous clients include SMEs, a marketing agency, the University of Edinburgh, and the Scottish government. Zsolt's most notable development is the QuestNative for Scotland app, which is available on Android and Apple stores.
Previously at

10+ Years
of Experience
A full-stack developer, Klas has worked professionally since 1994. For the last six years, he has worked at Klarna, where he has participated in developing their app from the start and is ranked third on the list of most commits to the Klarna app monorepo out of over 500 developers and three million lines of code in TypeScript. Klas has worked with React, React Native, and Node.js at Klarna and was one of the people who introduced TypeScript and GraphQL. He loves the challenge of freelancing.
Previously at

6+ Years
of Experience
Rupesh is a highly skilled full-stack software engineer with over six years of experience architecting and developing robust and scalable web and mobile applications. He has a track record of success in various projects, including Benable, Hohm Energy, and ReAlpha. Rupesh is well-versed in multiple programming languages and tools, including TypeScript, Node.js, React, React Native, and Next.js, and can take full ownership of delivering a project from start to finish.
Previously at

8+ Years
of Experience
Ning is a former startup founder and award-winning designer who brings a deep understanding of user needs to her role as a senior product designer. With a passion for solving complex problems and empowering users through thoughtful design, she has earned recognition for her creativity and problem-solving abilities, including prestigious awards from IxDA and Fast Company’s World Changing Ideas. Ning is an overachieving professional who can bring your design visions to life.
Previously at

14+ Years
of Experience
Sargis is a QA engineer and currently a director of quality engineering with 14+ years of experience and deep expertise in test automation. He has worked with companies specializing in mobile, web, SaaS, and enterprise applications. Sargis has been an excellent asset to distributed international teams, he is an advocate for the Agile methodology, and a skilled practitioner of Agile, Scrum, and Kanban.
Previously at

14+ Years
of Experience
Tim is a senior software architect and engineer. He has built the technology stack for multiple startups from the ground up. Tim has experience rescuing projects and turning train wrecks into successful launches, and has worked in many domains, including 3D games, retail, banking, Internet of Things, high-performance servers, machine learning, and scalable application server design. Tim has also worked with cloud servers like Amazon Web Services, Google Cloud, and Azure.
Previously at

12+ Years
of Experience
At Figma, Coinbase, and GoDaddy, Caleb spent more than 12 years designing products that scaled. He’s fast, independent, and knows how to build things that users love and businesses need. With experience as a founder, he brings a sharp focus on aligning design with strategic goals to drive growth.
Previously at

12+ Years
of Experience
Sean is a senior developer with a broad and versatile skillset who works heavily in React, React Native, and Node.js. He has an entrepreneurial spirit and a midwest work ethic and has worked with a large range of companies of different sizes and scopes. His strong theoretical and practical background in software architecture, UI design, DevOps, and business consulting makes him extremely capable of bringing success to projects of any size.
Previously at
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Challenge: The company needed a scalable, reliable app to support thousands of users while adhering to strict budget and time constraints.
Solution: Toptal implemented React Native to build a cross-platform mobile application from a single codebase, enabling faster delivery and long-term scalability. On the back end, the team improved performance by implementing Firebase Functions to run scheduled background tasks: processing music files, extracting and organizing metadata, and storing data efficiently in Firestore.
Outcome: Toptal’s architecture enabled the app to support thousands of simultaneous users, validating its scalability and performance ahead of deployment. By offloading processing from the front end, the background Firebase integration further improved load management, enabling seamless access to music files and ensuring smooth playback and consistent performance for users.
Newsweek and Statista’s rankings were based on an independent survey of more than 2,400 decision-makers at Fortune 500s.

Methodology for the Rankings
How likely the respondent is to recommend the selected company to others.
Measures the convenience of interaction with the company and efficiency of processes.
Measures the company’s cost-effectiveness and quality relative to price.
Measures whether the company consistently meets or exceeds expectations in quality and timeliness of deliverables.
Measures the company’s ability to consistently fulfill commitments and maintain customer trust.
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Cross-platform mobile apps are increasingly being built with React Native. But how can you scan for QR codes and augment the user's camera view when they're present?
Read MoreReact Native App Development Services Related Offerings
Pair Toptal’s React Native App Development Services with related competencies to effectively tackle your business challenges.
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