JavaScript experts, mentors, speakers

Sebastian Witalec is the head of Developer Relations at Weaviate. He loves working on both serious and fun projects, and one day he will use his robot army to conquer the world. He is always happy to learn about new stuff and to pass the knowledge as far as his voice (or the wire) can take him. Sebastian is based in Copenhagen, actively working with various Dev communities across Europe. When not acting techie, he is a massive football fan/player (probably bigger at heart than in skills).

Backend Software Engineer for +10 years in industries such as telco, online betting, and financing, embraced the passion for leading and caring for people 3 years ago, being now at OLX Group as Engineering Manager.

Experienced Customer Success professional with a history of working in developer tooling and startups. Extensive background as a support professional.

Rodrigo is a focused developer who produces digital projects for agencies around the world. He has 20 years of experience using various methodologies and tech in most web and mobile projects. He has a strong knowledge base of the WordPress world and is very engaged with the community: building custom themes, plugins, and core customizations. He specializes in WordPress, developing for the front-end back-end and in managing digital projects.

Sam is the cofounder/CTO at Oso working on making security more accessible for developers. Sam previously got a PhD in Cryptography and was a contributor to TLS 1.3

Senior Software Engineer at CureApp inc, & CTO at RENDEZ-VOUS.

Christian Sparks is a Systems Engineer working at Cloudflare, primarily focused on Builds and Automation for the developer platform. His work ranges across the stack, from front-end to Golang backends, to bleeding edge Workers-based services. Specifically, he works on the customer-facing build systems for the Pages and Workers CI, helping make the process of deploying applications on Cloudflare easier.

As the Founder and CEO of an edtech startup, I combine my passion for education with my product management experience to create innovative learning solutions that improve soft skills development. Our startup provides learners with engaging tools and resources to practice and master essential soft skills. With a focus on continuous innovation, we're dedicated to transforming the way learners acquire and develop soft skills. Our approach is grounded in the latest research and tailored to meet the needs of our diverse learners. I'm excited to be leading a team that is making a real impact in the edtech industry. If you're interested in learning more about our startup or connecting with me, please feel free to reach out. I'm passionate about education and excited to collaborate with others who share my vision for a better future of learning.

Theo is a full stack designer, developer, and entrepreneur, passionate about dev tools and building simple solutions to complex problems. He's worked in a range of industries for companies like Breather, System Initiative, and Clay.

Ilya Pukhalski is a founder and partner at ENDGAME. He spent 20+ years in software engineering, architecture and product development, designing and delivering large transformation programs for IKEA, Primark, Nike, Albert Heijn. He founded ENDGAME on a conviction: software engineering is in a renaissance, and machines amplify great engineering minds rather than replace them. At ENDGAME he builds a dark factory of autonomous agent pipelines, and helps other organizations make the same leap into agentic product development.

Arsalan Khattak is a Developer Advocate passionate about modern web technologies. He has created content for GitHub Education and spoken at major events like Google DevFest and Microsoft Reactor. Beyond tech, Arsalan is an adventurer and motorcycle enthusiast.

Iustin is an Engineering Manager at Fastned, where he leads core engineering teams and drives pragmatic AI adoption across ways of working and product delivery. He focuses on building strong engineering cultures, aligning teams with business outcomes, and helping organizations adopt AI responsibly and effectively. He is also the founder of DataPrysm, an agentic analytics platform, previously built and scaled Replica AI, and actively invests in early-stage startups - bringing a founder-operator perspective to modern tech leadership.

Jen Person is a developer advocate for Squid Cloud, an enterprise-grade backend-as-a-service that connects to and secures any API or data source. With nearly a decade of experience in developer products, Jen has extensive experience connecting with developers through talks, blogs, events, social media, and videos. She is passionate about creating the best development experiences so devs can focus on creating the best applications.

James is Co-Founder and CEO of ElectricSQL. Prior to founding Electric, he co-founded the Post Urban venture builder and was co-founder and CTO of synthetic data company Hazy.

Hailing from Vancouver, Canada, now living in Holland, Jacob is an avid API designer. He is a core collaborator of Node.js (loaders/modules, test runner, and userland migrations teams), TC39 and WinterTC / TC55 delegate, and author of several npm packages. Outside of engineering, he's known for cats, wine, and brunch.

A charismatic Lead Software Engineer on Pepr at Defense Unicorns is an architect and engineer focused on cloud native and hybrid cloud environments focused on solving problems of scale, latency, reliability and secure software delivery. Lover of coffee and improving the open source community.

Jonas spent years supporting startups as a React and Next.js freelancer. Now, he leverages his expertise as a Developer Success Engineer at Vercel to help customers succeed. When he's not programming, Jonas enjoys preparing the perfect espresso.

Develop professionally for 14 years. Worked as a team lead at Deloitte and Nielsen. Currently I lead my own tech company Tourmaline Core. I am passionate about people self-development culture at tech. I am a PhD.

Javier Alcaide is a mathematician and software developer focused on data science and machine learning. His professional career is based on the use of advanced analytics and big data techniques within the financial sector. His current role is the design and construction of AI models and the analysis of data using ETL processing with Big Data technologies.

Aikerim Belispayeva is a Senior Analyst at Memorial Healthcare System, where she leads data-driven initiatives to improve hospital billing accuracy, detect improper payments, and modernize revenue cycle management. With a Master’s in Data Analytics and a strong background in SQL, Python, and EHR systems like EPIC, she works at the intersection of data science, healthcare finance, and regulatory compliance. Aikerim brings a unique perspective to the tech world — blending deep industry expertise with hands-on analytics to advocate for smarter, more user-centric data tools. She is also a recognized speaker and award-winning advocate for using data to drive impact in public health systems.

Matt Seccafien In the 20 years since studying in my homeland of Canada, I've held a variety of professional roles, starting out in traditional print, typography and information design, to site resiliency engineering, to open-source React framework development, and I'm currently interested in design system operations. I value creativity and autonomy in both life and work, and thrive when I am invested in the whole idea rather than any single facet. When not at my computer I can be found running around Tempelhofer Feld in Berlin, at the kino or hanging out with my partner Fiona and our cat Otto. Simon Lenz Hi, I’m Simon, a developer from Kaiserslautern, Germany. I work at DeepL on breaking down language barriers. Accessibility is a particular interest of mine, because we should bring everyone along in that process. I like hiking in the beautiful Pfälzerwald and, these days, also enjoy playing the flute, editing the magazine of a historical board game society, and strolling across Tamriel as my Khajiit.

Nick is an Engineering Manager at Eye Security, where his teams build the software keeping European enterprises safe from cyber threats. With 13 years in the industry and an MBA that keeps him dangerously close to Product thinking, he's spent his career sitting at the intersection of technical delivery and business impact... and genuinely enjoying it. He believes a manager's most important job is building the environment that builds the engineers. Outside of work, he channels his creativity into photography, with results that are best described as "enthusiastic."

Nonso is a developer, writer, and tinkerer that enjoys pushing the boundaries of web development. He has a passion for creating software that empowers others to bring their ideas to life. Currently, he is a senior software developer at Konrad Group, where he actively builds solutions for various clients in the digital space. When he's not at his desk developing, you can find him rocking climbing, jumping out of airplanes, and seeing what new photography gear he can get his hands on!

Andrew is a veteran software leader with two decades of experience across diverse industries, including finance and eCommerce. During his four years as a Principal Software Engineer at Miro, he has driven both infrastructure and product initiatives. He currently leads AI adoption for engineering, product, and design from within the Developer Experience stream. His background also includes three years at Skyscanner, where he helped architect a robust machine learning and personalization platform. Andrew lives with his family in the UK and tries his best not to think about imposter syndrome.