Uber has extensively adopted Go as a primary programming language for developing microservices. Our Go monorepo consists of about 50 million lines of code and contains approximately 2,100 unique Go services. Go makes concurrency a first-class citizen; prefixing function calls …
Murali Krishna Ramanathan
Murali Krishna Ramanathan is a Senior Staff Software Engineer and leads multiple code quality initiatives across Uber engineering. He is the architect of Piranha, a refactoring tool to automatically delete code due to stale feature flags. His interests are building tooling to address software development challenges with feature flagging, automated code refactoring and developer workflows, and automated test generation for improving software quality.
Engineering Blog Articles
CRISP: Critical Path Analysis for Microservice Architectures
Uber’s backend is an exemplar of microservice architecture. Each microservice is a small, individually deployable program performing a specific business logic (operation). The microservice architecture is a type of distributed computing system, which is suitable for independent deployments and scaling …
Handling Flaky Unit Tests in Java
Introduction to Flaky Tests
Unit testing forms the bedrock of any Continuous Integration (CI) system. It warns software engineers of bugs in newly-implemented code and regressions in existing code, before it is merged. This ensures increased software reliability. It also …
Introducing Piranha: An Open Source Tool to Automatically Delete Stale Code
At Uber, we use feature flags to customize our mobile app execution, serving different features to different sets of users. These flags allow us to, for example, localize the user’s experience in different regions where we operate and, more importantly, …
Research Papers
Optimization of Swift Protocols
R. Barik, M. Sridharan, M. K. Ramanathan, M. Chabbi
Swift, an increasingly-popular programming language, advocates the use of protocols, which define a set of required methods and properties for conforming types. Protocols are commonly used in Swift programs for abstracting away implementation details; e.g., in a large industrial app from Uber, they are heavily used to enable mock objects for unit testing. Unfortunately, heavy use of protocols can result in significant performance overhead. [...] [PDF]
Object-Oriented Programming, Systems, Languages & Applications (OOPSLA), 2019
Swift, an increasingly-popular programming language, advocates the use of protocols, which define a set of required methods and properties for conforming types. Protocols are commonly used in Swift programs for abstracting away implementation details; e.g., in a large industrial app from Uber, they are heavily used to enable mock objects for unit testing. Unfortunately, heavy use of protocols can result in significant performance overhead. [...] [PDF]
Object-Oriented Programming, Systems, Languages & Applications (OOPSLA), 2019