Quanzheng Long
Software Engineer at LangChain
Seattle, Washington, United States
Summary
🤩
Rockstar🎓
Top SchoolQuanzheng Long is a software engineer with 11 years of experience specializing in workflow engines, distributed systems, and developer platforms, currently building the LangGraph platform at LangChain. He created the open-source iWF (Indeed Workflow Framework) and was a founding engineer on Uber Cadence, contributing to the foundation of what became Temporal—work that anchors his deep expertise in durable orchestration and long-running asynchronous workflows. His background spans storage and low-latency systems from roles at AWS and Baidu through leadership positions at Indeed, where he led workflow platform work for hiring systems. Comfortable across backend and DevOps, he has a track record of improving deployment automation, Docker ecosystems, and service IDLs while also shipping core features for orchestration clients and servers. Based in Seattle, he pairs hands-on engineering with platform thinking, often focusing on the intersection of workflow, storage, and developer experience—an unusual combo that explains both his open-source impact and enterprise influence.
11 years of coding experience
14 years of employment as a software developer
Master of Science - Industrial Engineering Database, Master of Science - Industrial Engineering Database at Purdue UniversityBachelor's degree Computer Science, Bachelor's degree Computer Science at Zhejiang University
Stackoverflow
2,281reputation
83kreached
96answers
23questions
Github Skills (26)
docker10
apidoc10
cassandra10
microservices-application10
dockers10
cicd10
go10
api10
automated-build10
golang10
orchestration10
microservices10
thrift10
idl10
microservice-framework9
Programming languages (15)
Github contributions (5)
cadence-workflow/cadence
Oct 2017 - Nov 2022
Cadence is a distributed, scalable, durable, and highly available orchestration engine to execute asynchronous long-running business logic in a scalable and resilient way.
Role in this project:
Back-end & DevOps Engineer
Back-end & DevOps EngineerContributions:12 releases, 544 reviews, 461 commits in 5 years 2 months
Contributions summary:Quanzheng primarily focused on enhancing the infrastructure and functionality of the Cadence server. They contributed to Docker-related configurations and scripts, including adding build arguments, fixing image issues, and implementing an auto-build script. Furthermore, the user made modifications to the system, which involved adding new features or improving existing ones, such as incorporating support for the system. The user's expertise is also demonstrated through their role in establishing and resolving issues with the domain.
cadenceresilientorchestration-engineservice-buslogic
cadence-workflow/cadence-go-client
Jun 2018 - Jan 2023
Framework for authoring workflows and activities running on top of the Cadence orchestration engine.
Role in this project:Back-end Developer
Back-end DeveloperContributions:8 releases, 30 reviews, 68 commits in 4 years 7 months
Contributions summary:Quanzheng primarily worked on synchronizing API definitions from a server repository and generating code based on those definitions. They updated the Cadence IDL files, which are used for defining the data structures and service interfaces within the project. The commits also included adding security tokens to domain write requests and implementing parent close policy features, indicating work on core service logic and potentially internal architecture. The user's contributions involved changes to IDL files and generated code, suggesting a focus on data models, service definitions and interactions.
golangworkflow-functionscadenceorchestrationauthoring-workflows
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