Konstantin Varlamov
C Standard Library Engineer at Apple
Cupertino, California, United States
Summary
🤩
Rockstar🎓
Top SchoolKonstantin Varlamov is a C Standard Library engineer at Apple with a decade of systems-level C++ experience focused on high-performance, correct library implementations. He works on libc++, bringing deep knowledge of the C++ standard library to production-grade runtime components. His open-source contributions to Firebase across JavaScript, Android, and iOS SDKs show hands-on expertise in Firestore internals, gRPC stream implementations, and performance optimizations for large-collection reads. Konstantin combines low-level C++ development with practical API and backend work—implementing timestamp/GeoPoint serialization, auth token fixes, and buffering for gRPC streams. Trained originally in information security with a top-grade engineering degree, he brings a strong foundation in correctness and safety to library and networking code. Colocated in Cupertino, he pairs rigorous engineering discipline with a track record of improving reliability and performance in widely used developer platforms.
10 years of coding experience
1 year of employment as a software developer
Engineer’s Degree, Complex Protection of Objects of Informatization (information security degree), GPA: 5.0/5.0, Engineer’s Degree, Complex Protection of Objects of Informatization (information security degree), GPA: 5.0/5.0 at Altai State Technical University
English, Russian
Github Skills (28)
javascript10
c-language10
typescript10
data-serialization10
java10
serialization10
javas10
android10
typescript-types10
firestore10
performance-tuning10
typescripts10
cprogramming-language10
firebase10
grpc10
Programming languages (14)
Github contributions (5)
firebase/firebase-ios-sdk
Feb 2018 - Sep 2021
Firebase SDK for Apple App Development
Role in this project:
Back-end Developer & API Developer
Back-end Developer & API DeveloperContributions:228 reviews, 335 commits, 347 PRs in 3 years 8 months
Contributions summary:Konstantin primarily worked on porting and implementing the C++ version of Firestore's internal gRPC-based stream implementation. They implemented the basic gRPC stream wrapper, including the setup of context, writing, reading, and finishing of the stream. Furthermore, the user fixed errors that were occurring and introduced a wrapper that would buffer writes. Finally, the user also worked on refactoring the underlying C++ classes, such as `Datastore`, to use the implemented C++ gRPC objects.
firebase-databasefirebase-functionsdatabase-as-a-serviceremote-configios
firebase/firebase-android-sdk
Oct 2018 - Sep 2020
Firebase Android SDK
Role in this project:Back-end Developer
Back-end DeveloperContributions:9 reviews, 16 commits, 18 PRs in 1 year 11 months
Contributions summary:Konstantin primarily contributed to the Firebase Android SDK, focusing on improving the Firestore implementation. They addressed critical issues related to the remote store, including fixing a write stream check. Moreover, the user implemented performance optimizations for reading large collections by memoizing data and optimizing queries. These changes involved modifying core components of the Firestore library, directly impacting the efficiency and reliability of data access.
firebase-remote-configfirebase-databasefirebase-firestorefirebase-functionsdatabase-as-a-service
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