Lazaro Clapp
Software Engineer at Jane Street
New York, New York, United States
Summary
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Rockstar🎓
Top SchoolLazaro Clapp is a seasoned software engineer with 15 years of experience building and hardening tooling for static analysis, program transformation, and backend systems, currently at Jane Street in New York. He blends deep research roots (Ph.D. work on malware detection at Stanford) with production-grade engineering from roles at Uber and Gitar, including leading work in programming systems and feature-flag refactoring. An active open-source contributor, Lazaro has improved major projects such as Facebook Infer and the Checker Framework—enhancing null-safety, dataflow CFGs, and lambda support—that directly reduce real-world crashes like NPEs. He’s equally comfortable writing rigorous tests and plumbing stack-trace crash contexts as he is simplifying nested conditionals in large refactoring tools, and he brings a thoughtful, recovery-minded approach to career pacing informed by intentional sabbatical experiences.
15 years of coding experience
14 years of employment as a software developer
Universidad Nacional Autónoma de México (UNAM)Ph.D. Computer Science, Ph.D. Computer Science at Stanford University
English, Spanish
Stackoverflow
3reputation
0reached
0answers
0questions
Github Skills (26)
typesc10
c-language10
static-analysis10
flow-control10
dataflow10
expressions10
testing10
typescript10
feature-flags10
software-quality10
java10
javas10
type-system10
lambdas10
expression10
Programming languages (11)
Github contributions (5)
uber/NullAway
Sep 2017 - Jan 2023
A tool to help eliminate NullPointerExceptions (NPEs) in your Java code with low build-time overhead
Role in this project:
Back-end Developer
Back-end DeveloperContributions:8 releases, 556 reviews, 254 commits in 5 years 5 months
Contributions summary:Lazaro primarily contributed to the improvement of the NullAway tool, which focuses on eliminating NullPointerExceptions in Java code. Their commits demonstrate work related to Java and focus on implementing and refining dataflow analysis by upgrading dependencies such as the checker framework and adding support for method references and improved error messages. The user also added and improved testing features for various Java 8 and library code features.
overheadnullabilityandroidstatic-code-analysisrefactoring
uber/piranha
Oct 2019 - Dec 2021
A tool for refactoring code related to feature flag APIs
Role in this project:Back-end Developer
Back-end DeveloperContributions:329 reviews, 58 commits, 47 PRs in 2 years 1 month
Contributions summary:Lazaro primarily contributes to the `uber/piranha` project, a tool for refactoring feature flag APIs. The commits show the user updating and modifying the `XPFlagCleaner.java` file, which appears to be core to the project's functionality. These changes include incorporating code from an internal repository and improving simplification of nested conditionals. The user also made changes to test files, and configuration files, indicating involvement in the entire development lifecycle.
astcode-qualitydeadcodecode-managementast-matcher
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