Ravindra Ranwala

Senior Software Development Engineer (Java) with over 12 years of industry experience in different key domains including Finance, eLearning, Middleware and Healthcare. Solid experience in writing clean code with performance in mind, problem solving and analytical skills, programming, system design, code review, leadership and mentorship. Good exposure to processes like CMMI, Agile Scrum, SDLC, PEP.

• Message Processor coordination support in WSO2 ESB, where we go a step beyond in order to achieve high availability and scalability. Coordination support of the Message Processor comes into play when you run it in cluster mode. Therefore we need to have a cluster setup with one manager and few worker nodes with us. The implementation is based on JMS 2.0 and Hazelcast clustering framework. Hazelcast cluster messages were used to communicate between different nodes in the cluster. Different message processor tasks get executed in different worker nodes. Manager node is responsible for adding, deploying, editing and deleting ESB artifacts where workers are responsible for serving client requests. When a worker node crashes or restarts, automatic failover takes place and the task is getting scheduled to the other worker node in the cluster. This yields high availability in the production setup. Moreover the number of tasks getting executed in workers are configurable using properties and multiple message processor tasks can get executed in parallel on multiple nodes. More details can be found in the blogpost.

• Active Response, an interactive e-Learning application that helps university instructors to conduct students assessments online. The project was mainly implemented using the microservices architecture. Reactive programming paradigm was used to make it more scalable. The front end was implemented using react/redux with javascript. An instructor can add multiple different question types to the system. Different instructors can share their question banks with each other. The question types allowed were multiple choice questions, matching, short answer etc. TinyMCE andmathjax editors were used to support mathematical equations. Upon the instructor delivering the questions, the students can take the exam and the system finally evaluates their work and assigns scores based on their answers. Micro services architecture was used for the implementation. There were multiple downstream microservices and a service facade that integrates and implements the code business logic in the system. Spring security module was used for authorization between different user roles in the application. Connection to the database was mainly using spring data JPA. Both MySQL and MongoDB were used depending on the suitability for the use case and the data model used. Application was deployed in the AWS cloud.

• Designed and implemented a graph based RDF store for Apache cassandra as part of my MSc research project.

• Virtusa Merit Award for Academic Excellence in the field of IT, Year 2011 Convocation.

Oracle Certified Professional, Java SE 6 Programmer.