Stephen Belanger
Principal Software Engineer at Platformatic
Vancouver, British Columbia, Canada
Summary
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RockstarStephen Belanger is a Principal Software Engineer with 16 years of deep experience in systems and application performance, currently building a Node.js application platform at Platformatic from Vancouver. A long-time Node.js core contributor and founder of the tracing/diagnostics working group, he specializes in async_hooks, asynchronous local storage, and VM/compiler internals that power reliable observability. He led core tracing and profiler work at Datadog and previously built Node APM agents at Elastic, bringing rare expertise in both product-grade instrumentation and low-level runtime changes. Stephen’s contributions include performance-minded implementations in Datadog’s dd-trace-js and significant edits to nodejs/node and V8 to tighten promise hook integration—work that quietly shifts how Node apps are observed and diagnosed in production. He balances production-focused engineering with open-source stewardship, often sponsored to work directly on Node core stability and performance.
16 years of coding experience
14 years of employment as a software developer
English
Stackoverflow
6,321reputation
841kreached
17answers
36questions
Github Skills (25)
javascript10
es6-promise10
v810
apm10
profiling10
datadog10
nodejs10
devops10
testing9
dockers9
tracer9
docker9
performance-monitoring9
performance-optimization9
trace9
Programming languages (24)
Github contributions (5)
elastic/apm-agent-nodejs
Dec 2017 - Oct 2019
Role in this project:
Backend & DevOps Engineer
Backend & DevOps EngineerContributions:163 commits, 398 PRs, 230 pushes in 1 year 11 months
Contributions summary:Stephen primarily contributed to the core functionality and infrastructure of the Node.js APM agent. They implemented new features like support for distributed tracing, added support for custom configurations, and integrated new instrumentation for frameworks like Handlebars. Their work also involved enhancements to the test suite, including adding coverage reporting and fixing existing tests. The user demonstrated proficiency in build processes and deployment by including work related to docker and container builds.
performance-monitoringagentapmdevopselastic
DataDog/dd-trace-js
May 2020 - Jan 2023
Datadog APM client for Node.js
Role in this project:Back-end Developer
Back-end DeveloperContributions:7 releases, 1197 reviews, 181 commits in 2 years 8 months
Contributions summary:Stephen primarily contributed to the core functionality of the Datadog APM client for Node.js. Their work focused on implementing and benchmarking asynchronous local storage for scope management, which involved modifying platform-specific code and integrating new dependencies. They also added support for profiler configurations and enhanced the agent's export process with features like backoff mechanisms and the inclusion of additional metadata. Finally, they improved the CPU profiler by addressing latency concerns.
apmjavascripttracingapm-tracertracer
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