Samuel David O.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

Over the last 10 years, I have developed a wide range of web applications, including projects for startups and small businesses. My primary expertise area is Grails and other Java-Based Technologies like JSF and Struts. I've quite experience in frontend and backend programming Apart from being an engineer and an enthusiast software developer, i like project managing and care about planning, documenting, testing, using automation when possible. Some of my expertise areas are > Groovy / Grails > JSF > Struts > JPA (Hibernate and EclipseLink) > AWS (EC2, S3, SES) > Postgresql > Mysql > Twitter Bootstrap > Javascript, Jquery > Packer, Vagrant > Linux > Primefaces > MongoDB > Git and Git Flow > Backbone.js > Atlassian (Jira / Confluence / Bamboo) > Web Crawlers (Groovy / Geb) > PHP (Yii, Symfony) I also have good experience in SQL querying and Image editing software (i.e Photoshop, Gimp). Heroku and OpenShift. I have implemented online payment platforms, and know very well some third-party APIs, like > Stripe for payment platform > Mandrill, MailChimp, Amazon SES for mailing > AWS (EC2, S3) for virtualization and storing in the cloud I am a highly committed and responsible developer, focused on continuously improving my skills, and develop a long-term relationship with my clients