John Ferrolino

• Designed system for an AI startup in the medical field that leverages a scalable micronaut based service on k8s cluster
• Delivered and written a technical document using MkDocs that includes ERD and flowchart using Mermaid text-based script for diagramming
• Improved code search feature of legacy backend used by codedepot.ai frontend.
• Provided better way of error handing and reporting of graphql (ie sangria) api for legacy backend
• Developed a better and performant solution for code search version 2 that includes a git repository extractor using jGit and indexer using Lucene. Built with functional programming style that uses tagless final pattern with cats, cats-effect and fs2.
• Optimise extraction and indexing operations that previously took ~1000 seconds for more or less 45 different repositories, reducing time to 36 seconds, resulting in 97.64% improvement in efficiency.
• Implemented file watcher that reuses extractor and indexer components for newly added repository that provides more real-time and reactive approach to indexing data for search
• Built and design micro services to expose api for interacting with Lucene search index and added RPC services that uses gRPC with Protobuf.
• Implemented improvements to project structure for enhanced reusability, resulting in streamlined development processes and increased efficiency.
• Improved API gateway that uses graphQL that includes fixing memory leaks through properly releasing resources.

• Designed and Implemented data pipeline that uses Apache Spark and MistIO serverless proxy for IoT based Building automation and monitoring.
• Reviewed internal systems and organised training plans to address areas in need of improvement.

• Completed delivery of data migration pipeline that handled petabytes of data and stored on data lake (i.e. Azure Data lake gen2) and postgresql database.

Main technologies used include: scala and apache spark, azure data lake gen2, akka, presto, postgresql, quartz and apache livy

• Responsible in maintaining OTA (Over the Air updates) stack, open source project written in Scala for IoT devices, to keep site reliability high.
• Written devops task for kubernetes deployments as charts and automation for continuous integration/delivery with 10% increase deployment efficiency.
• Porting microservices as charts and configuring API gateways using Kong

Technologies used: SCALA, kubernetes, helm, Kong, lua, AWS, Advance Telematics Solution (OTA), JWT

• Designed project architecture using Lightbend stack following Event Sourcing (ES) and CQRS design tailored to specific end-user needs
• Consulted with clients to align future software development with customer priorities

Technologies: SCALA, lagom, CQRS/ ES, Cassandra, Postgresql

• Developed Core Billing Platform with microservices for Identification, Subscription and Content Management(CMS) systems.
• Improved implementation of workflow engine with akka FSM.
• Interfaced with front-end and back-end development teams to develop unified product, smoothing out coding conflicts before problems arose
• Trained and facilitated knowledge transfer to new software engineer recruits
• Managed team of 5 engineers on projects in Fintech field

Technologies used: java, spring, SCALA, akka, akka fsm, quartz, centili API, mobiltek

• Developed frontend using react and nodejs that includes voice recording request with one-click button
• Implemented backend features based from agreed specifications
• Managed development milestones from initial steps through final delivery.

Technologies used: javascript, react, nodejs, scala, play framework

• Designed and developed RESTful web APIs, impression server and integration layer to legacy system
• Maintained frontend internal web application written in javascript using angularJS and D3
• Supported legacy system that uses Spring on top of Websphere

Technologies used: java, javascript, angular, D3, spring and websphere

• Defined product development and agile workflow
• Maintained current and in-depth understanding of business processes, needs and objectives
• Facilitated technical recruitment processes and helped win co-sourcing contract with California based startup (i.e. www.marketingsuite.com)
• Developed mobile application for iOS platform using objective-C and identified tools to streamline mobile development such as airflight, greenhopper, jira and git

• Designed and developed backend services for social neighborhood networking site (i.e. Yatown)
• Developed architecture of backend java webservices with php frontend
• Designed and implemented feature, "Deals Nearby" that earned company's first revenue.
• Also developed "People you may know" feature

Technologies used: java, apache seam, jackson, jersey, php

• Designed and developed internal revenue system and involved in supporting transition to new system.
• Worked for insurance company to develop territorial analysis system.

• Supported Rapid Loan Application Processing system (RAPS) for Credit Union of Australia
• Maintained proprietary service oriented system using axis2 in java and deployed on websphere server.

Technologies used: java, websphere, axis2

• Led team for developing systems for clients
• Designed and developed systems for different platforms (i.e. .Net and JVM)
• Supported and maintained existing products for clients.