JavaScript experts, mentors, speakers
Explore personalities and their talks, workshops, videos, and articles. While we focus primarily on JavaScript and frameworks like React, Vue, Svelte, and Node, you may find experts on other fields on our Portal. To name a few – Testing, DevOps, Machine Learning, and many more!

Jason Santos
Rangle, USA
Jason Santos is a Senior Solution Architect at Rangle.io, where he is responsible for mentoring teams, understanding problems, finding solutions, and providing technical expertise to different projects. In the few years he has been at Rangle, he was able to contribute to the success of large projects in the Banking, Healthcare and Electronic Payment spaces, helping shape Enterprise architecture, leading teams and implementing full stack solutions using NodeJS microservices and cloud-native technologies, as well as both Angular and React. He brings with him 30 years of experience in building software across multiple languages and environments, from embedded software to IDEs and Debugging tools -- designing and implementing software frameworks and building applications on both back-end and front-end since the late 1990s. Being a certified SAFe Agilist, Jason is a strong advocate of process improvement, DevOps and agile delivery practices; he is also passionate about knowledge sharing and mentoring other developers.

Katharina Fetzer
hylane GmbH, Germany
At the age of just 29, Katharina is Head of IT at hylane, a rental company for hydrogen trucks. She previously worked as a software developer and data engineer at WetterOnline for 9 years. In her work, she places a special focus on sustainable corporate IT and will share her experiences.

Jeff Hoffer
Rollbar, USA
Jeff Hoffer is the Technical Leader for Growth at Rollbar, working to improve Rollbar's current products and assist in developing new products that engage customers by bringing Continuous Code Improvement tools to where they are. With over 20 years of experience developing software for startups and enterprises, scaling to Internet traffic, building and maintaining commercially licensed products, and developing internal enterprise tools, Jeff has worked as a Software Engineer, Software Architect and in Director and VP roles leading technology organizations at Intuit, The Bouqs Company, Lunchbox (acquired), Accordent (acquired by Polycom) and Countrywide along with consulting work at many other prominent firms. Jeff has a passion for software development which is why he loves working at Rollbar so much with the focus on improving the professional lives of developers and the strong engineering culture.

Sam Stepanyan
OWASP London Chapter Leader, UK
Sam Stepanyan is an OWASP London Chapter Leader and an Independent Application Security Consultant with over 20 years of experience in the IT industry with a background in software engineering and web application development. Sam has worked for various financial services institutions in the City of London specialising in Application Security consulting, Secure Software Development Lifecycle (SDLC), developer training, source code reviews and vulnerability management. He is also a Subject Matter Expert in Web Application Firewalls (WAF). Sam holds a Master’s degree in Software Engineering and a CISSP certification.

Will Voelker
Aldeia, Portugal / UK
Will divides his time between web development and teaching, and has ever since 2005, when he started his web development career removing duplicate data from his friend's map-based property search app. Since then he has coded and taught in diverse contexts, from national newspapers to the shores of the Atlantic ocean. A qualified school-teacher, he is nevertheless passionate about alternative forms of education. He has spent the last two years researching and building his home-ed support platform, Aldeia (using React, obviously).

Miroslav Malecha
Bonitoo, Czech Republic
Miroslav Malecha is Director of Product management at Bonitoo.io. He has a background in computer science and has been focused on defining software products in data science, enterprise architectures and cloud computing. Prior to joining Bonitoo, Miroslav held product management positions at Good Data and Hewlett-Packard Software. When Mirek is not working, you can find him speeding down hills on his ebike in the forests near Prague.

Saravanan K Nagarajan
Rabobank, The Netherlands
Saravanan is an Architect working at Rabobank, Netherlands and one of the leads of the Growing Greener (Sustainability) community in the bank.
He has more than 22 years of experience in diverse IT and business roles with different banks across the world.
His passion is in Architecture, IT sustainability and Green Software and how we can generate more interest among the IT community in sustainable software.
He has been nominated as a "Green Software Champion" by the Green Software Foundation.

Kristina J. Robinson
Influxdata, USA
Kristina J. Robinson is a Software Engineering Manager at InfluxData. With over 20 years of software development experience, she is thrilled to be a part of the InfluxData UI team. Most recently, Kristina spent time in the financial tech sector working as front-end developer. Kristina graduated from Rice University with a degree in Computational and Applied Mathematics. She currently lives in San Antonio, TX, with her husband and teenage son, and has another son in college. She also has two cats, and fosters dogs and cats frequently. She plays video games with both her boys. She reads voraciously, enjoys paper crafts and knitting, and plays several musical instruments.

Marco Pierobon
Thoughtworks Inc, Spain
Marco Pierobon is a seasoned Developer at Thoughtworks with well over a decade of experience in designing and implementing distributed applications. Specializing in cloud native technologies, he has led cross-functional teams in transitioning from project-based to product-oriented approaches.
Marco has successfully orchestrated the migration of over 15 legacy systems to modern web-based platforms, significantly enhancing system scalability and performance.
An active contributor to the tech community, he has presented at industry and tech conferences alike. Marco is passionate about driving innovation and efficiency in software development, aligning with the latest trends in cloud computing and AI integration.

Jennifer Gray
Shopify, Canada
Jennifer is a front end developer on the Docs and API Libraries team at Shopify where our goal is to make it easier for developers to build on Shopify’s platform by creating and curating technical resources. Jennifer has spent the last two years working on shopify.dev, Shopify’s home for developer documentation.

Vitali Shchur
Check Point Software, Georgia
I am an experienced Quality Assurance (QA) engineer with over 10 years of experience in testing web applications, mobile apps, and desktop platforms (Windows, macOS, iOS, Android, Linux). I contributed to the growth of a startup from 25 to 250 employees, leading to its sale for $0.5 billion. I have worked at companies like Check Point Software and Perimeter 81, focusing on testing, creating test cases, analyzing specifications, and cross-platform testing. My extensive background spans product and outsourcing companies in cybersecurity, fintech, and education. I am also eager to share advice on career development in QA.

Selam Moges
Software Engineer, USA
I'm Selam and I'm currently a software engineer. I've always been fascinated by technology and its potential to make our lives better and more equitable. As an advocate for diversity, equity, and inclusion (DEI), I'm committed to making tech a come inclusive place for everyone.
I'm passionate about computer ethics and ensuring that technology is developed and used in ethical and responsible ways. I believe that technology can be a powerful force for good, but only if we approach it with a thoughtful and ethical mindset.

Samiul Huque
Bloomberg, USA
Samiul Huque is a senior software engineer at Bloomberg, where he works on the company’s Instant Bloomberg (IB for short) chat tool. He works across the stack, building full-stack products where he primarily uses a combination of JavaScript/TypeScript and Python. Outside of work, Samiul plays tennis, competes in MMA, and eats his steak medium rare. Samiul earned his bachelor’s degree in economics and mathematics from the University of Richmond.

Mateusz Jagodziński
Workflow Builder, Poland
Mateusz is a Principal Software Developer at Workflow Builder with seven years of experience in React. He specializes in building data visualization solutions and interactive diagramming interfaces. He combines technical expertise with a business focus to develop practical, high-impact applications.

Ilia Chernetskii
Evolution, Tallinn, Estonia
Ilia has been working as a Web Developer since 2008 and has rich experience in creating complex web applications and writing reliable client and server-side application logic in JavaScript. He worked both in a large corporation and in a small company, where he realized how to make decisions, take responsibility and manage a team. Created his own startup, which he successfully sold. Passionate about computer science, mathematics and finding answers to challenging questions. He always has high demands for the quality of his own code and does not compromise in terms of the logic and speed of the code. He loves minimalism in code, design, and life.

Meaghan Choi
Cloudflare, USA
Meaghan is a Designer at Cloudflare (previously Meta) focusing on the building the developer platform. Her expertise lies in creating developer experiences for cutting-edge technology including cloud computing, AI, machine perception and spatial computing. She is enthusiastic about bringing design into highly technical spaces and how design shapes development and vice versa.

Stephanie Shaw
Beamery, UK
Stephanie is a Senior Frontend Engineer at Beamery, and a seasoned full-stack engineer with considerable experience in the financial and public sectors. She's a passionate advocate for tech-for-good, diversity, and developer education. As a speaker, she's known for her entertaining talks and irreverent sense of humour. She is currently developing Beamery's AI-powered talent lifecycle management platform.





