Blockchain Development Services | Toptal®

Robert Orshaw

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.

Rachael Karaffa

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.

Piotr Poznanski

Piotr is a blockchain architect, software developer, and technical lead with more than 23 years of experience working with CERN, Motorola Solutions, universities, and more. He has led projects, served as a Scrum master, and developed and delivered complex web and mobile solutions, including business and technical requirements, architecture, third-party API integrations, data acquisition, and processing for BI. Piotr co-developed the pan configuration language and has a PhD in computer science.

Erick Watson

Erick is an innovative, entrepreneurial executive leader who translates customer needs into compelling product strategies that animate the business and technical worlds. He accelerates business impact with outstanding performance across product strategy and execution, challenging the status quo with industry-disruptive tech solutions. Erick distills and communicates complex technical information to drive action across the organization, interfacing with board members and C-level executives.

Gianluca Vaccarini

Gianluca is a highly versatile front-end and full-stack software engineer. He has helped many companies take an idea and turn it into a product that serves thousands to millions of users. Gianluca built the software that powers Tesla’s scheduling service centers from scratch, and has worked at Big Tech companies, such as Adobe, Starbucks, Snapchat, and T-Mobile. Known for building exceptionally fast and well, he can work on either end of the stack, integrate CI/CD, perform end-to-end testing, and more.

Nicolas Debaene

With a master of science degree in engineering and a specialization in data science from Telecom ParisTech, Nicolas has been solving concrete business cases for five years using machine learning and data mining. His experience in the eCommerce, banking, and consulting sectors gives him a very strong technology portfolio and a deep understanding of different business types.

Jimmy Stone

Jimmy has executed and evaluated more than $1 billion in debt, equity, and M&A transactions at the investment bank J.P. Morgan, the private equity firm Warwick Group, and as a consultant. He’s advised businesses ranging from pre revenue startups to public companies valued at more than $1 billion in a broad range of industries. Jimmy holds an MBA with honors from Wharton, and he joined Toptal to help clients create tangible value and learn about new business models.

Subbu Somasundaram

Subbu is a subject matter expert in information security and has more than 22 years of information technology experience. He has assisted large enterprise customers in the banking, telecommunication, and e-commerce sectors with security transformation, DevSecOps, security architecture, and implementations. Subbu’s security expertise includes AWS, GCP, IAM, enterprise security, data protection, and application security and compliance.

Casey is a product and project management professional with 15+ years of experience driving innovation in the insurance, healthcare, finance, gaming, blockchain, decentralized finance, and aerospace sectors. He has founded two companies, raised $4+ million in funding, scaled teams successfully, and played a pivotal role in guiding startups from inception to success. Casey is dedicated to leveraging technology to create impactful solutions that improve lives and contribute positively to society.

Denis is a senior full-stack AI engineer and data scientist, highly skilled in modern generative tech (GPT-4, Midjourney, and more), machine learning, ETL pipelines, data analysis, mathematical modeling, big data, and MLOps. He has a PhD in mathematics, and his data science expertise includes probabilistic risk modeling, revenue forecasting, geospatial data analysis, handwriting recognition, anomaly detection in time series, data engineering, and team leading.

Denis is a strategic W3 product designer and design systems advocate passionate about solving problems and creating deeply felt experiences. He advocates for a process-driven approach to design that relies equally on empathy, data, and the ability to ideate quickly. Denis is a deft collaborator with a reputation for consensus-building. His goal is to enrich lives, one interaction at a time.

Cleivson is a senior back-end engineer with more than a decade of experience working in Agile development and solving business problems by diving deep into the user’s requirements. While working at Amazon, he was able to develop and maintain systems with a high load (millions, sometimes billions, of requests per day) in a highly scalable and highly available environment. Cleivson specializes in C#, Java, and TypeScript languages and can rapidly ramp up in any other technology.

Simone is a machine learning scientist and engineer with experience in academia and enterprises, including Microsoft and Huawei. He likes to work at the intersection of deep machine learning, natural language processing, and information retrieval. Simone also loves to work on exploration analysis and building theoretically sound machine learning pipelines ready for production. He especially enjoys building web products.

Nicaury is a security engineer with 7+ years of experience in information security, cybersecurity, and systems administration. She has worked in fast-paced, remote environments for years, developing excellent communication and leadership skills. Nicaury is a certified professional with proven problem-solving and analytical skills, a fast learning curve, and the ability to adapt to any team.

Kaustav is a hands-on, goal-oriented, versatile technology professional with more than two decades of experience, primarily in open-source digital technologies such as blockchain, IoT, microservices, cloud services, distributed architecture, R&D, design, and development. He has a proven track record of delivering consistent business results, and he loves to take on technical challenges, learn about new technology innovations, and deliver successful products worldwide.

Satish is an adaptable and technically strong professional with a customer business value-added mindset and several years of experience in quality assurance for companies like Deloitte and Consensys. While Satish specializes in Selenium, Cypress, and API testing, he's also comfortable building automation test frameworks and recently led the technical portfolio for an automation project.

As a blockchain developer, Laxman understands the importance of good, clean code and follows industry best practices. He has more than 10 years of experience working with different phases of the software development life cycle, from development to delivery. Overall, Laxman is the type of developer who’s always eager to take on new challenges.