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Helder da Rocha
Mentor
(1 reviews)
US$15.00
For every 15 mins
ABOUT ME
Seasoned full-stack writer and developer
Seasoned full-stack writer and developer
I teach programming (mostly Java) and I've been researching, writing about, experimenting with and teaching Java and Web technologies since 1995. I wrote a book on HTML and another on JavaScript in 1996/1998 (in Portuguese) and in 2019 two books on data visualization with JavaScript in English ("Learn D3.js" and "Learn Chart.js" by Packt). I have also authored several tutorials, slides, code and textbooks on Java, Java EE, programming tools, patterns, techniques, methodologies, HTML, CSS, JavaScript, SVG, XML/XSLT/XSD and related technologies. My favorite subjects include D3.js, Java and Java EE, interactive graphics and data (mostly XML) transformations. I love teaching and solving problems. I also enjoy electronics, Arduino and IoT and have written a guide on those topics.
Portuguese, Russian, Spanish, English
Brasilia (-03:00)
Joined May 2016
EXPERTISE
20 years experience
I have used, taught and written about Java since its inception in 1995. I wrote a tutorial in 1996 which later became a textbook used in ...
I have used, taught and written about Java since its inception in 1995. I wrote a tutorial in 1996 which later became a textbook used in courses by 3 companies in São Paulo and Rio de Janeiro. I was a Java instructor at Sun Microsystems (since 1997), I have several Java-related certifications and have spoken about Java at many events including JavaONE. I am currently reading several specs and making simple programs as part of my research on Java 12, since I intend to write a book on that subject.
18 years experience
I have used Java EE technologies since its inception and written text-books and articles about its many technologies. I deveolped my mast...
I have used Java EE technologies since its inception and written text-books and articles about its many technologies. I deveolped my masters degree research about distributed performance in Java using early CORBA and RMI-IIOP implementations. I taught instructor-led courses in J2EE and Java EE 5 at Sun Microsystems and several other companies, and wrote texts, articles and presentations about EJB, JPA, Servlets, JSP. JSF, RMI, CORBA, JavaMail, JAX-RPC, JAX-WS, JAX-RS, JMS, CDI, JNDI, JCA, JMX, JAAS, JAAC, JASPIC, and other Java EE technologies.
18 years experience
It's my favorite XML parsing language. I love to solve XSLT puzzles.
It's my favorite XML parsing language. I love to solve XSLT puzzles.
18 years experience
I have used XML and related technologies since its inception and developed many projects using XPath, XSLT. I have also written tutorials...
I have used XML and related technologies since its inception and developed many projects using XPath, XSLT. I have also written tutorials and textbooks on XML, XSLT, XPath, SVG and XML Schema, which I used to teach XML related technologies in Brazilian companies.
18 years experience
Great to find and extract things from the deep web, writing screen scrapers and XSL transformation. I also love to solve XPath challenges.
Great to find and extract things from the deep web, writing screen scrapers and XSL transformation. I also love to solve XPath challenges.
7 years experience
I use SVG since 2009. In 2010 I wrote a tutorial and textbook used in training about SVG. Recently I have spoken about SVG in conferences...
I use SVG since 2009. In 2010 I wrote a tutorial and textbook used in training about SVG. Recently I have spoken about SVG in conferences (such as the Brazilian W3 conference in 2015) and teaching it in companies (mostly as part of a D3 course). I also wrote a book on D3.js which was published by Packt in 2019.
18 years experience
I have written books about JavaScript and libraries (1998/2000 and 2019). I teach several JavaScript-based courses and have used it in ma...
I have written books about JavaScript and libraries (1998/2000 and 2019). I teach several JavaScript-based courses and have used it in many projects (ES2015, React, Vue, D3.js and Chart.js).
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