Hi, I'm Juan Lopes

no bot no bot accepted

Who?

I'm a brazilian computer scientist (B.Sc., M.Sc., Ph.D. student) who lives in Rio de Janeiro and loves programming contests (was five times south-american finalist of the ACM ICPC and once Brazilian champion of the IEEEXtreme). I love competitions mostly because I like to actually write code. An atypical quality for a computer scientist.

I work at Zwift, writing software that handles near real-time communication in a massively multiplayer online game. I'm not so extrovert, but had the chance to talk a little about what I do at work in several conferences. You may find some info below.

Non-code stuff

Putting this section first because if you are here, it's likely because you need the link to the slides of some talk you've attended. Also, there is code in the next section. All the talks are in portuguese, by the way.

• Sketching data structures for massive graph problems
  An invited talk and paper at VLDB Workshop Poly'18 about the use of sketching data structures to solve graph problems.
• Big Graph: Big Data applied to giant and dynamic graphs
  A talk at QConSP 2018 about streaming graph algorithms.
• Probabilistic Implicit Graph Representations
  Paper and presentation at II ETC / CSBC 2017.
• Set Intersection Cardinality Estimation Using MinHash and HyperLogLog Data Structures
  Poster at CNMAC 2016.
• Randomness at the Heart of the Future Algorithms
  A talk at QConSP 2016 about probabilistic algorithms.
• Does Lucene Scale?
  A talk at QConRio 2015 about Lucene optimization.
• Algorithms in the Battlefront
  A talk at QConSP 2015 about the use of algorithms in LOB applications.
• PIPES: A Language for Distributed Complex Event Processing
  A talk at QConRio 2014 about a language I created for distributed aggregations over real time streams.
• What is Wrong with Regular Expressions?
  A talk at DevDay BH 2013 about the (bad) implementation of regular expressions engines.
• Analyzing and Reducing Big Data Streams in Real-Time
  A talk at QCon SP 2013 about distributed aggregations streaming algorithms.
• Java for .Net Programmers
  A talk at DevDay BH 2012 about the Java platform, viewed from a .Net developer viewpoint.
• Concurrent Programming in .Net 4.5
  A talk at Rio Info 2012 about the .Net's new features for concurrent programming.
• Distributed Architecture for Storage, Indexing and Real-Time Analysis of log data
  A talk at TDC 2012 and DNAD 2012 about a case I've been working on throughout 2011-2012.
• Algorithm Analysis and Complexity Theory
  A lightning talk at DNAD 2011 about algorithms and complexity theory for beginners.
• Continuous Integration and Deployment
  A talk at DNAD 2010 about continuous integration in an architectural level.
• .Net Magazine 85: Continuous Integration
  An article about continuous integration, from theory to practice. Focused on .Net developers.
• .Net Magazine 84: Reflection
  An article about reflection techniques in .Net.

Code, yay!

Mostly experimental stuff that I hope someday can be useful to someone.

• Actually 42
  A simple implementation of the Gauss-Jordan method to predict the next term in polynomial series.
• PyRex: A polynomial-time regular expression implementation
  A didactic implementation of regular expressions using Thompson's NFA. Also a paper I wrote about the subject.
• DojoTimer
  Coding Dojo timer for Windows (Mono compatible).
• Sketches: Bloom Filters, Count-Min Sketch and HyperLogLog
  Just me playing around with sketching data structures.
• DojoLang
  A hand made parser for a hypotetical language that compiles into Python bytecode.
• Online Perceptually Important Points
  A Proof-of-Concept for a dimensionality reduction algorithm. O(n²) in this version, but can be made O(n logn).
• Project Euler in Boo
  An attempt to solve Project Euler problems using Boo as main language.
• Online Judge problems in C++
  An attempt to solve UVa Online Judge problems (and others) using C++ as main language.
• MSBuild Runner
  A simple utility to run MSBuild without having .Net framework on system's PATH. Not mantained.
• MU Online 99B+ Exploit (Blaster)
  There's a small chance you came looking for new versions of MuBlaster. The project is dead since 2003, but the code is here.
• Pilgrim Migrations
  Used to be fluent migrations for .Net framework. Now it's just a dead project.
• Simple
  Used to be a business application framework. Now it's just a dead project.