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
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
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
Work Experience
Software Development Engineer
Amazon
- Implemented new shipment methods for 3rd-party sellers in Mexico and Brazil, reducing shipping costs by 30%-60%.
- Designed and implemented a fallback integration for an unreliable service, which proved to be more cost-effective.
- Led full-cycle project development while mentoring junior team members, driving on-time delivery and improving overall code quality.
Senior Software Engineer
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.
Senior Software Engineer
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.
Senior Software Engineer
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.
Software Engineer
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.
Software Engineer
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.
Software Engineer
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.
Security Analyst Intern
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.
Project History
chessvigil.com
http://www.chessvigil.comTech stack is React.js / node.js and Golang.
Space Battlegrounds
Competitive Programming Repository
https://github.com/jlgm/AlgoEducation
Master's Degree in Computer Science
University of São Paulo - Sao Paulo, Brazil
Bachelor of Science Degree in Computer Science
Federal University of Pernambuco - Pernambuco, Brazil
Visiting Student in Computer Science
University of Toronto - Toronto, Canada
Certifications
Advanced Topics in Object-oriented Programming
Coursera
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, Go (Golang), Cloudflare
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