Fedner J. Email & Phone Number

Miami Beach, FL, US

Remote First, US

• Significantly reduced latency and increased order throughput by implementing new concurrent trading system in Golang. System of order processing services used Redis to send messages between different components..
• Wrote a service for managing account balance transactions. Service handled crediting and debiting for all order operations including: New Order, Cancel, Trades, and Modify. Balance service was safe from repeated.
• Created a feature for probabilistic traffic routing to new service endpoints. Gave us the ability to randomly route a percentage of users traffic to the new system in order to slowly determine capable load.
• Implemented stop Loss/stop Limit order types on new trading system. Used an in- memory order cache for fast access and a listened-on order-book changes to verify if highest bid/lowest ask met trigger condition.
• Updated leader election for new trade engine. Used go channels to safely shut down all workers processes before new leader takeover. This prevented the possibility of trades occurring twice during deploy or engine.
• Wrote SQL for batch account updates to be run on production without impacting database performance.

Remote First, US

• Worked on an integration project with 3rd party vendor to detect market manipulation on the exchange. Daemons would pull market and order history data from the database and send it through a Kinesis stream to Athena. A.
• Increased exchange AUA by implementing changes to allow new margin trading bases. Also made changes to enable EU users to lend stable-coins in margin markets.
• Decreased database load by implementing a micro-service architecture. Micro-services would cache reference data allowing us to reduce calls to the database, and enabled fetching new data asynchronously. Services were.
• Performed full stack development. Worked on UI updates and bug fixes, backend trading features, and also database table design and performance improvements.

Boston, MA, US

• Improved Customer Experience by creating new performance APIs for Fidelity.com UI redesign
• Solved Production and non prod issues in APIs, services, database, and vendor products.
• Assisted in adding new managed solutions to Fidelity product catalog by implementing changes on batch engines, services, and vendor business process management software.
• Worked on an Agile team with a strong emphasis on unit testing coverage, functional testing, and documentation. Helped design best practices among tech team members based on clean code principles.

• Worked in a fast paced agile environment to develop new features for enterprise level software.
• Utilized a myriad of different technologies and languages in order to improve our systems. Worked primarily in Java, but had projects in Ruby, and Perl.

Brooklyn, New York, US

• Created, executed, and automated test scripts using Java and Selenium Webdrivers. In addition, used Linux command line to run test suite headless with PhantomJS driver.
• Used JIRA bug tracking software. Found and troubleshot bugs then provided documentation in Confluence. Pushed changes to code repository when necessary.

Bachelor Of Arts (B.A.), Computer Science

High School Diploma