Lucio Paiva Email & Phone Number

Lisbon, Portugal

Lisbon, Portugal

Lisbon, Portugal

Rio De Janeiro, Brazil

Zwift is an indoor cycling MMO platform. It requires an efficient, low-latency game server to be able to cope with hundreds of thousands of simultaneous users and provide a smooth experience to all of them.I am part of a select group of engineers responsible for the development of the algorithms that drive the core of the game server. This task involves working on amazing scalability challenges inherent to an MMO game. We need to carefully tailor our logic to efficiently relay player data, while also delivering a good user experience by guaranteeing acceptable latencies across the whole system. All of that needs to de done in a way that allow us to easily scale up to hundreds of thousands of concurrent players. That means not only taking care of our software, but also of the underlying system to guarantee its efficient use of available resources.

Worked on the development of a multi-tenant hybrid recommender system at big data scale, built from the ground up to be capable of easily attending new customers with minimum effort. Worked to make the system capable of handling huge amounts of concurrent RESTful requests in real time, implementing and benchmarking solutions using Tornado + PyMongo and asynchronous library Motor, both in Python. Also evolved the system to handle multi-tenant logging using Amazon Kinesis service to process each tenant’s stream, to be later consumed by our in-house analytics tool.Made a thorough investigation of Mongo’s concurrent capabilities, benchmarking several architectures in a combination of replica set and sharding, testing performance against various AWS EC2 instance types. Developed valuable knowledge of Mongo’s storage system and how it uses RAM to cache the working set and indexes. Evaluated the overall gains of vertical vs horizontal scaling when working with big data.In a joint effort with our team of data scientists, evaluated a series of solutions to provide a REST web service able to serve real time Machine Learning recommendations using regression models in R.Used Apache Spark to process huge amounts of log files in Python and made an interactive visualization tool using D3.js to analyze the results. Was also responsible for deploying the cluster infrastructure using AWS, testing both EMR and EC2 solutions.Actively participated in our interviewing process for Software Engineer and Product Manager job positions. Tried to make candidates comfortable and willing to give their best during the interviews.

Rio De Janeiro Area, Brazil

Helped to build our startup right from the first year and participated in the conception of both BoaLista and Belezuca apps. Initially helped develop BoaLista for iOS, but since then worked on virtually all our engineering fronts.Formed an R&D team, designed and created the hardware equipment and assembly code used by the app Belezuca to do real time indoor presence dectection, along with our own proprietary ultrasound transmission protocol. Was also responsible for the software receptor, embedded both in iOS and Android and developed in C. Designed an algorithm to correct distortion caused by different brands of Android audio boards and also a multi-band, fault-tolerant redundancy system to cope with ambient noise and wall reflection. Created a handful of audio transmission analysis tools using Node.JS, C++, Python and evaluated several Digital Signal Processing academic works.Also created a classification system capable of grouping products based on content similarity using Information Retriveal techniques in Python, using modified Vector Space Model and TF-IDF algorithms.Actively participated in the construction of our anti-crawling system for the BoaLista mobile app. Also developed back-office tools for Belezuca's anti-fraud system using Node.js in integration with a MS-SQL server and MailChimp.Was responsible for the total revamping of BoaLista's SQL database schema to support our generic product system. Also worked to make our Belezuca MS-SQL database scale out in cojunction with AWS tools.Worked on the development of several RESTful APIs for BoaLista and Belezuca, using Web API MVC ASP.Net / C#. Authored product-critical Javascript apps, both on client and in back-office tools, using several web technologies.

Rio De Janeiro Area, Brazil

Worked on the game "Desafio Sebrae 2010" written in ActionScript 3 / Adobe Flash 10. Among other things, created an internal obfuscation system used in the game to prevent cheating. Also contributed to the development of the game "Campus do Empreendedor", using ASP.NET, Delphi, Javascript and Flex.

Rio De Janeiro Area, Brazil

Development of an internal accounting system – Borland Delphi; MS SQL Server and Oracle databases.

Rio De Janeiro Area, Brazil

Developed a C++ tool for aiding in information extraction about gene expression regulation in DNA strands of Escherichia coli bacteria.

Rio De Janeiro Area, Brazil

Developed an experimental Short Message Service (SMS) digest e-mailing system using C on a UNIX System V platform.

Master'S Degree, Computer Science

COPPE/UFRJ Research on Artificial Intelligence, Information Retrieval techniques, Intelligent Transportation Systems and Distributed.

Bachelor'S Degree, Computer Science

Activities and Societies: CNPq Scholarship FellowFinal project: the development of an Electronic Chromatic Guitar Tuner from scratch.

Technical High School, Electronics