Working on network tokenization card provisioning and processing on Braintree by PayPal, improving merchants authorization rate on card transactions

Worked on certification processes with major processors (FirstData and Chase) for network tokenization transaction;

Enhanced and optimized code quality and mentored junior engineers

Technologies: Ruby, Ruby on Rails, Java 8, Spring Boot, GraphQL, REST API, Google Protobuf, PostgreSQL, Microservices Architecture

Migrated and refactored a legacy distributed Java application to modern Spring Boot. The newly migrated application helped the company to cut costs by leveraging a faster development experience and an overall more scalable technology stack

Engineered and implemented a RESTful web-based application with Spring Boot to generate and validate signed and encrypted JSON Web Tokens (JWT) to secure the communication between Western Union and Partner systems

Technologies: Java 8, Spring Framework, Spring Boot, REST/SOAP API, Oracle 11g, Hibernate, JSON Web Tokens

Worked on debugging and triaging processes for Mozilla Firefox “bugzilla.mozilla.org”. Involved in the organization of the official “Triage & Test Days” with firefox community.

Contributed to the engineering community on UI tweaks for the HTML5 full-screen APIs and other related processes individually executed the designing and implementation of a new Firefox web add-on that provided additional support to the bugmasters community.

http://www.tizianasellitto.it/blog/?p=128 For a summary of the experience