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João Lucas Gomes de Miranda
Verified Expert in Engineering
REST APIs Developer
São Paulo - State of São Paulo, Brazil
Toptal member since August 23, 2018
Bio
João is a skilled back-end engineer with experience in developing and maintaining systems that are used by hundreds of millions of people. He has previously worked with languages such as Go, Python, C/C++, Java, JavaScript, and more. He has strong algorithm skills and has demonstrated an ability for learning and excelling at new technologies as needed.
Portfolio
StockTwits
Go, PostgreSQL, Microservices, Architecture, AWS Lambda, API Development...
InVision App - Main
Go, PostgreSQL, OAuth 2, gRPC
Rappi
Go, PostgreSQL, Redis, Apache Kafka, MongoDB, Microservices, Docker, Back-end
Experience
- REST APIs - 8 years
- Back-end - 8 years
- Go - 7 years
- Algorithms - 6 years
- Microservices - 4 years
- PostgreSQL - 4 years
- Python - 3 years
- Security - 3 years
Preferred Environment
Git, Visual Studio Code (VS Code), MacOS, Linux
The most amazing...
...app I've built is a multiplayer game developed in three days, during a hackathon. The game was launched on Facebook and had 91,000 unique players.
Work Experience
Senior Software Engineer
2021 - 2023
StockTwits
- Spearheaded the development and maintenance of the portfolio service, enabling users to seamlessly connect their broker/banking profiles and access real-time financial metrics such as performance, valuation, and daily fluctuations.
- Designed and developed a leaderboards system. Leveraged complex performance calculation algorithms (such as TWR, MWR, etc.) and real-time data processing to compute and rank users accurately.
- Participated in product planning actively and contributed to feature ideation, driving innovation and fostering a culture of continuous improvement within the engineering team.
Technologies: Go, PostgreSQL, Microservices, Architecture, AWS Lambda, API Development, Amazon Simple Queue Service (SQS), Amazon Simple Notification Service (SNS), Plaid API, Kubernetes
Senior Software Engineer
2021 - 2021
InVision App - Main
- Fixed bugs, provided maintenance, and implemented features for all integrations, such as Figma, Google Drive, etc., as an Integrations Squad member.
- Developed the Google Drive integration, enabling millions of users of the InVision App to import Drive files to their home spaces.
- Aided in optimizing local and development environments, improving development time across all teams.
Technologies: Go, PostgreSQL, OAuth 2, gRPC
Senior Software Engineer
2020 - 2021
Rappi
- Developed a simulation and experiments tool in Go that enabled decision-makers at Rappi to conduct experiments and validate hypotheses using real-time data.
- Worked on the design of a completely new architecture for the order-courier assignation system.
- Implemented a key-value store interface in Go with a Redis client. This library will be used in all new Go projects that utilize key-value databases.
Technologies: Go, PostgreSQL, Redis, Apache Kafka, MongoDB, Microservices, Docker, Back-end
Software Engineer
2019 - 2020
String and Key
- Worked on designing, building and providing maintenance to micro-services and APIs for a banking/trading application. All micro-services were developed in Go.
- Developed libraries, wrappers and communication protocols between all services.
- Created an engine (in Go) that would subscribe to topics on a message queue and forward the events along to the services that would store / act upon them.
- Implemented unit tests and integration tests for all the services of the application, using Go's native testing platform.
Technologies: Amazon Web Services (AWS), Microservices, APIs, Docker, KrakenD, Kubernetes, PostgreSQL, Beego, Gorm, Go, Back-end
Software Engineer
2018 - 2019
Understood
- Worked on splitting a legacy monolithic application into microservices.
- Created the whole infrastructure on Google Cloud using GKE/Kubernetes, Terraform, and Istio.
- Implemented a CI/CD pipeline using Google Container Registry, GitHub, and CircleCI.
Technologies: REST APIs, Monorepos, Istio, Terraform, Docker, CircleCI, Kubernetes, Google Kubernetes Engine (GKE), Google Cloud Platform (GCP), Go, JavaScript, Python, Back-end
Software Engineer
2017 - 2018
Wildlife Studios
- Worked on the back end of very successful games such as Sniper 3D, Castle Crush, War Machines, and War Heroes–implementing new features, fixing bugs, monitoring and providing maintenance. All these games combined make up more than 1 billion downloads.
- Developed a UI for a matchmaker system (using React, D3.js, and Node.js), allowing product managers to plot graphs and configure/calibrate the matchmaker with just a few clicks.
- Developed a Facebook Instant game from scratch (both the client and the server) in three days during a hackathon. The game reached 91,000 unique users on the first month after launch.
Technologies: Datadog, Docker, Kubernetes, Jenkins, Prometheus, Kibana, Elasticsearch, PostgreSQL, MongoDB, Redis, Erlang, Node.js, Go, Back-end
Security Analyst Intern
2016 - 2016
Tempest Security Intelligence
- Performed penetration tests on websites and apps (some with millions of users), looking for well-known vulnerabilities such as SQL Injection, XSS, Remote Code Execution, Brute-force, etc. while also looking for flaws within the application logic.
- Reported all the vulnerabilities found with detailed information and the steps to reproduce them (proof of concept).
- Provided all the necessary steps to be made in order to secure these issues.
- Presented research about the state of security of specific technologies to other analysts.
Technologies: Metasploit, NMap, SQL, Burp Suite, Active Server Pages (ASP), Java, JavaScript, Python, Security
Software Engineer Intern
2014 - 2014
Design Starts
- Developed a RESTful API (using Django and PostgreSQL) for an Android app called Hap.
- Implemented scrapers for the Madrasa website.
Technologies: PostgreSQL, Beautiful Soup, Django, Python, Back-end
Teaching Assistant
2011 - 2013
Federal University of Pernambuco
- Worked as a teaching assistant for the "Algorithms and Data Structures" course at UFPE.
- Provided lectures and support to over 60 undergraduate students about coding algorithms and data structures in languages such as C++ and Java.
- Created and evaluated students' assignments.
Technologies: C++, C, Java
Experience
Space Battlegrounds
A Facebook instant game created during a hackathon at Top Free Games during the three days of competition. This game was the only multiplayer game presented and it had 91,000 unique players on the first month after launch. It is currently not maintained.
Evita
https://www.youtube.com/watch?v=NPIJy01X38oEvita is an app for checking drug interactions between Brazilian commercial drugs. The app was made for iOS and was available to purchase on AppStore. The group won a prize on a startup contest for being the best idea.
Playlist Generator
https://github.com/jlgm/PlaylistGeneratorThis app uses data from Last.fm (for finding similar tracks) and then searches for them on YouTube, generating a playlist afterward.
The program was developed using Angular and Node.js and is online on a free Heroku instance.
The program was developed using Angular and Node.js and is online on a free Heroku instance.
Running Balls
https://www.youtube.com/watch?v=Kn2Wr94tgBQA computer vision game implemented in C++ with the OpenCV library. This game identifies an object and then creates virtual red circles on the screen that run away from the chosen object. This was an assignment for a computer graphics course at CIn/UFPE.
Annotation of DBPedia Resources
https://github.com/jlgm/BDs-Inteligentes-ProjetoA tool made in Python/Django to find DBpedia resources on a text and annotate them with tooltips. This was a project for an intelligent databases course at CIn/UFPE.
DrugCrawling
https://github.com/jlgm/DrugCrawlingA search engine implementation in Python for an information retrieval course. The data was extracted from popular Brazilian pharmacy websites. The project has different modules such as crawler, classifier, extractor, indexer, queries, document ranking, and so on.
Space Invaders
https://github.com/jlgm/Space-InvadersThis is a game that is similar to Space Invaders and made in JavaScript and HTML5 (using Canvas). It was created for an assignment for the Programming on the Web course at the University of Toronto. A demo can be found at the link attached.
Competitive Programming Repository
https://github.com/jlgm/AlgoThis is a repository with my accepted solutions for algorithm problems on competitive programming sites such as Codeforces, Topcoder, and UVA.
Education
2022 - 2023
Master's Degree in Computer Science
University of São Paulo - Sao Paulo, Brazil
2011 - 2017
Bachelor of Science Degree in Computer Science
Federal University of Pernambuco - Pernambuco, Brazil
2013 - 2015
Completed Credits as an International Exchange Student in Computer Science
University of Toronto - Toronto, Canada
2007 - 2008
Technical Degree in Computer Networks
SENAI - Pernambuco, Brazil
Certifications
OCTOBER 2023 - PRESENT
Advanced Topics in Object-oriented Programming
Coursera
DECEMBER 2013 - PRESENT
English Language Program, Level 60
University of Toronto
DECEMBER 2012 - PRESENT
International Collegiate Programming Contest
ACM
Skills
Libraries/APIs
REST APIs, API Development, Node.js, Beautiful Soup, React, Plaid API
Tools
Git, Vim Text Editor, NMap, Metasploit, Kibana, Google Kubernetes Engine (GKE), CircleCI, Terraform, Istio, Jenkins, Amazon Simple Queue Service (SQS), Amazon Simple Notification Service (SNS)
Languages
Go, Python, C++, JavaScript, Java, Active Server Pages (ASP), PHP, C, Erlang, SQL, Ruby, Clojure, Rust, Kotlin
Paradigms
Microservices, REST, Continuous Integration (CI), Object-oriented Programming (OOP), Functional Programming, Continuous Delivery (CD), Scrum
Platforms
Linux, Google Cloud Platform (GCP), Windows, MacOS, Burp Suite, Amazon Web Services (AWS), Apache Kafka, Kubernetes, Docker, Visual Studio Code (VS Code), AWS Lambda
Storage
PostgreSQL, Redis, MongoDB, Datadog, Elasticsearch, MySQL, Databases, Database Management Systems (DBMS)
Frameworks
Django, Laravel, Gorm, Beego, Ruby on Rails (RoR), Angular, OAuth 2, gRPC
Other
Security, Algorithms, Back-end, Distributed Systems, Architecture, Software Engineering, OOP Designs, Prometheus, KrakenD, APIs, Monorepos, Data Structures, Operating Systems, Computer Networking, Artificial Intelligence (AI), Applied Mathematics, Graph Theory, Machine Learning, Programming Languages, Programming, English
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