
Kotlin and Java are two powerful general-purpose languages popular for Android and beyond. We’ll discuss their top features and differences, then focus on how to smoothly transition between the two.
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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

13+ Years
of Experience
Yashveer boasts over a decade of experience crafting and optimizing software for dynamic startups and large established enterprises, with a sharp focus on scalability. As a co-founder and CTO of an AI-driven fintech company, he designed a product that supports 400,000 users monthly. Skilled in Java and Node.js, Yashveer relies on these tools for development, while music fuels his energy during intense coding sessions.
Previously at

10+ Years
of Experience
Vadim has more than ten years of experience as a cloud architect and DevOps engineer and a background in full-stack Java web development. His expertise includes infrastructure, optimization, deployment, CI/CD pipelines, migrations, and security.
Previously at

13+ Years
of Experience
Frank is a seasoned professional currently working as a software engineer at Amazon. He previously served as the VP of engineering at Penfield.AI, a Toronto AI startup pioneering in empowering human-machine intelligence in the cybersecurity space. Frank also worked as a senior engineer at Meta's enterprise trust organization, helping to build Facebook's privacy and compliance software infrastructures. He also worked on IBM WebSphere Java Runtime, which powered many Fortune 500 Java applications.
Previously at

20+ Years
of Experience
Seema brings more than 20 years of software testing and quality assurance expertise to the table. She has substantial experience with manual testing and the test automation of web and mobile applications. Seema is a certified Scrum master, an IBM-certified Db2 professional, and an AWS-certified solutions architect comfortable with Agile and Waterfall approaches. Her in-depth knowledge of API and performance testing delivers excellent results.
Previously at

15+ Years
of Experience
Sreedevi is a ground-up executive with more than 15 years of experience building, scaling, and transforming organizations at hypergrowth B2B and large companies. She has led teams across Google, Yara International, and startups within product, strategy, and customer success. Sreedevi has experience working across several high-profile organizations and enterprises, including Unilever, Mondelēz International, Philip Morris International, and The Tata Group.
Previously at

22+ Years
of Experience
Mohamed is a senior full-stack developer with 22+ years of experience at companies like Microsoft, Amazon, Google, and Facebook. His experience spans a wide range of technologies, from Angular 2 to Java and .NET. He is a team player and passionate about dynamic web applications built on REST services.
Previously at










13+ Years
of Experience
Nabil is a full-stack developer with 13 years of experience building robust apps for clients from different business domains. His area of expertise includes Agile software development and working with the Java programming language, and he has a solid background in developing eCommerce websites using the SAP Hybris platform. Consistently delivering high-quality working and maintainable solutions, Nabil is eager to take on new challenges.
Previously at

17+ Years
of Experience
Vedat is a full-stack developer with 17+ years of experience focusing mainly on back-end development using Java technologies. He also has front-end experience with Angular, JavaServer Faces, and Vaadin. In roles ranging from junior to lead developer in Turkish companies, Vedat has developed solutions for large insurers (AgeSA and ERGO), telecoms (Turkcell and Nortel Netaş), Siemens, and major supermarkets.
Previously at

23+ Years
of Experience
Ahmed is a software and systems engineer carrying over 23 years of experience designing and implementing highly scalable applications. He is mainly a C++, Rust, Python, Scala, and Java developer but can fluently work with nearly 10 programming languages and frameworks. He is a functional programming evangelist, the author of a book titled "Getting Started with Memcached," and a reviewer of several Python programming books.
Previously at

11+ Years
of Experience
Dolly is a QA engineer with more than 11 years of experience in a range of industries, including real estate, travel, finance, and aviation. She has created multiple testing frameworks from the ground up using Selenium, TestNG, Cucumber, and Cypress and has automated QA processes. Dolly manages test execution not only from the technical point of view but also from the customer’s, as she believes product usability is as vital as functionality.
Previously at

15+ Years
of Experience
Divya is a fractional product leader with diverse experience in software engineering, consulting, and product management. She has held multiple leadership roles at high-performing organizations such as Facebook, McKinsey, and Y Combinator-backed startups. She can help companies build high-performing product teams, set a product strategy, and improve teams’ execution.
Previously at

31+ Years
of Experience
Mike is a senior developer with three decades of experience building software for embedded systems and cloud platforms, including more than 31 years at Intel. He has substantial experience with Linux, C, C++, Python, and Java and has worked with media technologies, networking, eCommerce, and payments. Mike is an experienced technical lead.
Previously at

13+ Years
of Experience
Hanee' is a data expert who enjoys working on data analytics and segmentation to better target customers with campaigns. He is an experienced Java developer who has built enterprise applications that interact with millions of customers daily. Hanee' also has experience working with big data, Spark, and Python.
Previously at

20+ Years
of Experience
Victor is a seasoned full-stack developer with 20+ years of experience building software for clients such as Y&R, Bancolombia, and Orbitz Worldwide. He's proficient in the Java platform and Spring framework and passionate about functional programming, leveraging Clojure and ClojureScript in his most recent projects.
Previously at

10+ Years
of Experience
Anurag is an experienced security professional with a strong background in incident handling and threat hunting based on different attack frameworks. He has expertise in Active Directory and cloud security (Azure), utilizing offensive security tools such as Bloodhound to identify and mitigate threats. He's played a key role in the development and deployment of SOC infrastructure. He's delivered training to different tiers of the SOC team on security best practices, compliance, and the cyber threat landscape.
Previously at
Looking for guidance about the perfect Java development service for your needs?
Looking for guidance about the perfect Java development service for your needs?
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Having previously worked with these leading global companies, our talent brings valuable insights and expertise to deliver world-class outcomes.
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Challenge: The healthcare company faced overwhelming workloads due to manual processes and operational friction. It lacked the advanced Java expertise required to efficiently integrate complex web services into its core systems, creating bottlenecks and slowing access to critical patient data.
Solution: Toptal led the execution of a full-stack Java integration, deploying an expert Java developer to integrate laboratory services into the company’s communication module, automating data exchange and significantly improving operational efficiency. The engagement also included end-to-end design and implementation of a comprehensive insurer payment module, streamlining transactions and reducing delays across financial workflows.
Outcome: The solution enabled doctors to quickly access patient status and test results, significantly improving communication with laboratories and overall healthcare delivery. Automated processes also reduced manual intervention, minimized errors, and delivered meaningful time savings for healthcare professionals.
Newsweek and Statista’s rankings were based on an independent survey of more than 2,400 business decision-makers at America’s largest firms.

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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Kotlin and Java are two powerful general-purpose languages popular for Android and beyond. We’ll discuss their top features and differences, then focus on how to smoothly transition between the two.
Read MoreJava Development Services Related Offerings
Pair Toptal’s Java Development Services with related competencies to effectively tackle your business challenges.
Looking for guidance about the perfect Java development service for your needs?
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