Open sourceBackendAdvanced
CPython
Official Python reference implementation for interpreters, the standard library, and language evolution.
Python Software FoundationAbout 2 hrpythonc
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Opportunities and learning resources
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Open sourceDataIntermediate
dbt Core
Analytics-engineering transformation tool for SQL modeling, data tests, and collaborative workflows.
dbt LabsAbout 2 hrsqldata-modeling
Open sourceBackendAdvanced
Deno
Official runtime repository for JavaScript, TypeScript, and WebAssembly.
DenoAbout 2 hrrusttypescript
Open sourceBackendIntermediate
Django
Mature Python web framework with a clear contribution workflow and long-term maintenance practices.
Django Software FoundationAbout 2 hrpythondatabase
Open sourceDataIntermediate
DuckDB
An in-process analytical database — a readable codebase for learning query execution.
DuckDBAbout 2 hrcppsql
Open sourceFrontendIntermediate
Excalidraw
A hand-drawn style whiteboard where every change is visible — a satisfying first contribution.
ExcalidrawAbout 2 hrreacttypescript
Open sourceBackendIntermediate
FastAPI
Modern Python API framework for learning type hints, async APIs, and automatic documentation.
FastAPIAbout 2 hrpythonapi
Open sourceBackendIntermediate
Fastify
High-performance Node.js web framework with contribution guides and an approachable plugin ecosystem.
OpenJS FoundationAbout 2 hrnodejsapi
Open sourceBackendBeginner
Flask
Lightweight Python web framework with an approachable codebase for a first real open-source contribution.
PalletsAbout 2 hrpythonapi
Open sourceBackendIntermediate
Grafana
Observability dashboards with beginner issues across both its Go backend and TypeScript frontend.
Grafana LabsAbout 2 hrgotypescript
Open sourceDataIntermediate
Great Expectations
A data-quality framework where adding a new expectation is a well-sized starter task.
Great ExpectationsAbout 2 hrpython
InternshipBackend · Frontend · AI · DataIntermediate
Huawei Campus Recruitment
Official Huawei portal for internships, graduate roles, processes, and events across multiple technical fields.
HuaweiChina
Official source · Huawei Campus RecruitmentVerified Aug 24, 2026
CompetitionBackend · Frontend · AI · DataAny level
China International College Students Innovation Competition
Official portal for the Ministry of Education interdisciplinary student innovation competition, whose projects may span multiple technical fields.
Ministry of Education of ChinaCost to verifyChina
Official source · National College Student Entrepreneurship ServiceVerified Aug 24, 2026
CompetitionDataIntermediate
Kaggle Competitions
Official directory of open data-science and machine-learning competitions from multiple hosts.
KaggleCost to verify
Official source · Kaggle CompetitionsVerified Aug 24, 2026
Open sourceBackendIntermediate
Kubernetes
The container orchestration standard, with a dedicated new-contributor onboarding track.
CNCFAbout 2 hrgokubernetes
Open sourceAIIntermediate
LangChain
Framework for LLM applications, including tool use, retrieval, and agent engineering.
LangChainAbout 2 hrpythonagents
CompetitionBackend · Frontend · AIIntermediate
Lanqiao Cup Software and Information Technology Competition
Official portal for cross-disciplinary tracks including programming, web development, testing, cybersecurity, and AI.
Lanqiao Cup Organizing CommitteeCost to verifyChina
Official source · Lanqiao CupVerified Aug 24, 2026
Open sourceAIIntermediate
LlamaIndex
A RAG framework where adding a new data connector is a well-templated starter task.
LlamaIndexAbout 2 hrpython
InternshipAI · Frontend · Backend · DataIntermediate
Microsoft Students and Graduates
Official Microsoft portal for student internships, programs, and graduate roles beyond AI alone.
Microsoft
Official source · Microsoft StudentsVerified Aug 24, 2026
Open sourceFrontendIntermediate
MUI
A React component library that keeps a steady queue of well-scoped good first issues.
MUIAbout 2 hrreacttypescript
InternshipBackend · Frontend · AI · DataAny level
National College Student Employment Service Internships
Official Ministry-affiliated portal for internships and graduate roles across frontend, backend, AI, data, and other fields.
Center for Student Services and Development, Ministry of EducationChina
Official source · National College Student Employment ServiceVerified Aug 24, 2026
Open sourceBackendIntermediate
NestJS
Official TypeScript server framework repository for learning modular backend architecture.
NestJSAbout 2 hrtypescriptapi
Open sourceFrontendIntermediate
Next.js
Official repository for the React full-stack framework, with documentation, tests, and contribution issues.
VercelAbout 2 hrreacttypescript
Open sourceDataIntermediate
NumPy
Foundational Python scientific-computing library for arrays, performance, and native extensions.
NumPyAbout 2 hrpythonnumerical-computing