Marcela Kashiwagi Silveira, Developer in San Francisco, CA, United States
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Marcela Kashiwagi Silveira

Verified Expert  in Engineering

Bio

Marcela is an experienced web and mobile developer from Brazil currently living in Silicon Valley. She has a very strong understanding of software architecture and also a very strong mathematical background. She was selected by ZDNet as one of ten most influential female tech innovators in Brazil, as well as mentioned on Mashable, Forbes, and others several times.

Portfolio

Toptal Clients
Cocoa Touch, UIKit, OAuth, REST, Core Data, Parse, Firebase, Swift, iOS...
Calm.com
SwiftUI, Swift, Swift 5, Objective-C, Xcode, Mobile App Design, UIKit...
Cabe na Mala
Ruby on Rails (RoR), Ruby

Experience

  • iOS - 13 years
  • Software Development - 12 years
  • REST APIs - 12 years
  • Object-oriented Programming (OOP) - 12 years
  • Objective-C - 8 years
  • Swift - 7 years
  • Firebase - 3 years
  • Swift 5 - 1 year

Availability

Part-time

Preferred Environment

REST APIs, Firebase, Parse, Swift, Objective-C, iOS, Xcode, SwiftUI

The most amazing...

...Thing I’ve built is my own startup, Cabe na Mala, which was acquired in 2016.

Work Experience

iOS Software Engineer

2012 - PRESENT
Toptal Clients
  • Contributed to the development of iOS projects using Objective-C and Swift.
  • Used different APIs and SDKs to create apps from scratch and submit them to the App Store.
  • Maintained and added new features to existing apps.
Technologies: Cocoa Touch, UIKit, OAuth, REST, Core Data, Parse, Firebase, Swift, iOS, Objective-C, iOS SDK, Mobile App Design

Senior Software Engineer, iOS

2021 - 2024
Calm.com
  • Led different projects and worked in a cross-functional team to brainstorm ideas, build new features, and maintain existing ones.
  • Created new experiments using LaunchDarkly and tracked success through Amplitude.
  • Used different technologies and proposed ideas to improve code quality and unit tests.
Technologies: SwiftUI, Swift, Swift 5, Objective-C, Xcode, Mobile App Design, UIKit, LaunchDarkly, Amplitude

CTO

2013 - 2016
Cabe na Mala
  • Helped create this startup from scratch to exit.
  • Managed the technical team, a team of 20+ people based in the US and Brazil.
  • Planned, executed, and measured growth strategies, partnerships, and product development.
Technologies: Ruby on Rails (RoR), Ruby

Lead Software Engineer

2011 - 2012
Zign Marketing Digital
  • Developed applications and games for the iOS platform using Cocos2D, Box2D and, Chipmunk frameworks, Game Center API, Facebook, Twitter, and LinkedIn Connect.
  • Integrated with native web applications using JSON, SOAP, and REST web services.
  • Integrated with live TV streaming.
  • Developed web applications.
Technologies: LinkedIn API, X (formerly Twitter), Facebook, GameKit, OpenGL ES, Chipmunk, Box2D, Cocos2d, Objective-C

Researcher

2010 - 2011
Signal Processing Laboratory (COPPE/UFRJ)
  • Contributed to the NeuralTB project, which produces software supporting the diagnosis of pulmonary tuberculosis through neural networks.
  • Developed a solution for checking, transmitting, and synchronizing the databases on mobile devices, in clinics, and in hospitals.
Technologies: Mobile, Databases

Software Engineer

2010 - 2011
UPlay Mobile
  • Developed applications and games for iOS using Cocos2D, Box2D, and Chipmunk frameworks, Game Center API, Facebook, and Twitter Connect.
Technologies: X (formerly Twitter) API, Facebook, GameKit, Chipmunk, Box2D, Cocos2d

Software Engineer

2007 - 2010
Stone Age Tech
  • Developed and integrated data mining algorithms, including decision trees, linear regression, and logic regression into the company’s applications.
  • Developed a CCore database management system with an architecture that ensures high performance even with large volumes of data and compatible with leading market solutions.
  • Collaborated with the engineering team for a data mining application in the Object Pascal programming language, including neural network algorithms, genetic algorithms, and automatic extraction of association rules (MBA - Market Basket Analysis).
  • Collaborated with the engineering team on an application made in the Object Pascal programming language to create, visualize, and distribute reports used by a number of financial institutions: Itaú, Bradesco, Unibanco, Citibank, Credicard, and BV Financeira.
Technologies: Object Pascal

Reddit

WORK DONE
• Within the Consumer Safety team, I worked collaboratively with design, product, and engineering to deliver great user experiences and empower users to define and enforce safety standards for their communities;
• Wrote high-scale reusable code and unit tests to provide a safer and healthier experience to over 400 million active monthly users around the world.
• Implemented analytics to measure performance, use, and success rate of legacy and new features in a complex iOS application using both Objective-C and Swift.

Reddit has reported 430 million active users (2019) and is the third-most downloaded news app in the United States.

Calm App

Calm is the #1 app for sleep, meditation and relaxation.

WORK DONE
• Worked as a member of the DTC Growth team and implemented A/B tests to optimize our funnels for user engagement and conversion to premium subscribers, working closely with product and data science to track business metrics and KPIs in order to measure the impact of all experiments I lead or contribute to.
• Led a cross-functional team through multi-sprint projects, scoping, planning, communicating with stakeholders, and driving architectural decisions to build end-to-end features that impact hundreds of millions of users.
• Proposed and executed two large-scale projects that not only improved code quality, testability, and performance, moving from Objective-C and UIKit to SwiftUI and MVVM, but also increased our velocity in conducting A/B tests in the most critical area of our business: the upsell screens for in-app purchases, making new experiments easy, quick to implement, and independent of new app releases via a server-driven UI.
• Implemented our first in-app ML integrated experiment, offering new users a dynamic discount based on their willingness to pay, which resulted in a substantial increase in the number of subscribers and revenue.
2011 - 2011

Executive Education Degree in Project Management

Fundacao Getulio Vargas - Brazil

2011 - 2011

Executive Education Degree in Business

Babson College - Massachusetts, US

2006 - 2011

Bachelor’s Degree in Compter Science

Universidade Federal do Rio de Janeiro - UFRJ - Brazil

Libraries/APIs

REST APIs, Facebook API, OpenGL ES, LinkedIn API, X (formerly Twitter) API

Tools

Xcode, Sublime Text, LaunchDarkly

Languages

Swift 3, Swift, Swift 4, Swift 5, HTML5, Objective-C, HTML, CSS, Swift 2, CSS3, Object Pascal, Ruby, JavaScript, PHP

Paradigms

Object-oriented Programming (OOP), Scrum, REST, Mobile App Design

Platforms

iOS, Google Ads, Mobile, Parse, Parse Server, Firebase, X (formerly Twitter)

Frameworks

UIKit, SwiftUI, iOS SDK, Cocos2d, Box2D, Chipmunk, GameKit, Core Data, Cocoa Touch, Ruby on Rails (RoR)

Storage

MongoDB, MySQL, Databases, PostgreSQL, JSON

Other

Software Development, Facebook, OAuth, Amplitude

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