Pedro Cunha

An E-Voting platform, scalable, fault tolerant that has been used in several Professional bodies, financial institutions, and international organizations. The system was built in Java, using the Spring framework (Core, Data, Security, MVC,. . . ), Hibernate with JPA as the ORM to “bridge” between the Java program and the PostgreSQL database, which I was also responsible for maintaining(data and consistency wise). The platform was developed as a series of RESTful services, both for internal and external communications. During this time, I was also the lead on the migration from the SVN version control system toGit, having to assure the correct port of branches, tags and defining the workflow for the entire development department.

I am part of the team responsible for the infrastructure that manages all the business logic between Betfair and the Italian regulator for betting. To accomplish this, my team has under its wing several applications built on top of the in-house Cougar application server. These applications had very strict concurrency and scalability requirements, with multiple nodes and multiple clusters present, both in an active-active and active-passive scenarios. Among other things, I was responsible for handling split-brain scenarios in Hazelcast on one application and one of the leads in migrating from synchronous programming to an event-sourced architecture using Akka Actors, Akka Persistence and Akka Clustering(with sharding), usingCQRS(CommandQuery Responsibility Segregation) for the read operations. I’ve also come in contact (and therefore had to learn) Kafka streams since all information reached our applications that way. As far as other duties during this time, I am also part of the on-call support team for our infrastructure, having to deal with operational issues, thus increasing my business knowledge in order to better understand our clients and provide better solutions.

A product aiming to de-materialize all the paperwork required in contracts, like new hirings, banking and credit services, using secure methods to provide the digital equivalent of legally binding signed contracts. This product is being used by big companies like ONEY, McDonald’s, and Leaseplan to eliminate paperwork from their processes. During this project, I’ve come in contact with yet more technologies, having to develop (and maintain) aJava library for Android to interact with a mobile card reader, maintenance of mTrust’s Android application as well as implementing flows in Camel and Spring Webflow.

A series of microservices developed in Scala using Apache Storm framework that handles all the event catalog of a betting business (price updates, market updates, and more), using Apache Kafka for message passing and Cassandra for persistence. This platform is capable of handling over 6k messages per second and is easily scalable both horizontally and vertically.

The platform also includes an Elasticsearch cluster for querying purposes.