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Hieu Do

PROFILE

Hieu Do

Over a two-month period, contributed to core infrastructure projects by delivering targeted feature enhancements in C++, Java, and backend development. In the envoyproxy/envoy repository, implemented dynamic modules SSL attribute expansion, enabling modules to expose detailed TLS connection metadata for improved observability and granular security policy enforcement. This involved ABI updates and new filter callback getters to support fine-grained SSL connection inspection. For linkedin/rest.li, enhanced load balancing configurability by introducing cluster-level policy support, new client type options, and serialization tooling, using Java and serialization techniques. These contributions improved scalability, reliability, and operational control without introducing regressions or requiring bug fixes.

Overall Statistics

Feature vs Bugs

100%Features

Repository Contributions

3Total
Bugs
0
Commits
3
Features
2
Lines of code
1,047
Activity Months2

Work History

February 2026

2 Commits • 1 Features

Feb 1, 2026

February 2026: Implemented substantial enhancements to load balancing configurability in linkedin/rest.li, enabling cluster-level policies and richer runtime control. Delivered support for RingHash, LeastRequest, and RoundRobin policies, introduced a client types enum with optional field, and aligned config modeling with an aliased union, including ClusterProperties. Added serialization/deserialization converter and updated changelog/documentation to reflect the changes. This work improves traffic distribution, reduces latency, and simplifies operator workflows, delivering measurable business value in scalability and reliability.

June 2025

1 Commits • 1 Features

Jun 1, 2025

June 2025 monthly summary for envoyproxy/envoy: Delivered Dynamic Modules SSL Attribute Expansion, enabling dynamic modules to expose TLS connection metadata (TLS version, certificate details, SANs). This work includes ABI updates and new getters in the filter callback to support granular inspection and policy-driven control of SSL connections. Impact: improved observability, security policy granularity, and diagnosability for TLS traffic. Tech stack/skills demonstrated include C++, dynamic modules, ABI compatibility, and SSL/TLS metadata handling. Commit reference: 21a5aa036bd76688f27e19b046c480b59a271f4e (#39988).

Activity

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Quality Metrics

Correctness86.6%
Maintainability86.6%
Architecture86.6%
Performance86.6%
AI Usage33.4%

Skills & Technologies

Programming Languages

CC++JavaPDL

Technical Skills

API DesignAPI DevelopmentAPI designC++Dynamic ModulesJavaLoad BalancingNetwork ProgrammingSSL/TLSSerializationbackend developmentload balancing

Repositories Contributed To

2 repos

Overview of all repositories you've contributed to across your timeline

linkedin/rest.li

Feb 2026 Feb 2026
1 Month active

Languages Used

JavaPDL

Technical Skills

API DevelopmentAPI designJavaLoad BalancingSerializationbackend development

envoyproxy/envoy

Jun 2025 Jun 2025
1 Month active

Languages Used

CC++

Technical Skills

API DesignC++Dynamic ModulesNetwork ProgrammingSSL/TLS