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OpenStem
@openstem · Joined Jul 2026
7420 public items8 groups
Collection4 items
01Modules & Providers
02Controllers, Pipes & Guards
03Software · L2 · NestJS: Custom Provider Resolution
+1 moreSoftware · L2 · NestJS
@openstem
Software · L2 · NestJSCollection4 items
01Indexes & Scaling
02Aggregation Framework
03Software · L2 · MongoDB: Replica Sets & Failover
+1 moreSoftware · L2 · MongoDB
@openstem
Software · L2 · MongoDBCollection5 items
01Indexes & Query Planning
02Joins & Subqueries
03Data Types & JSONB
+2 moreSoftware · L2 · PostgreSQL
@openstem
Software · L2 · PostgreSQLCollection5 items
01Networking & VPC
02Databases (RDS & DynamoDB)
03Security & IAM
+2 moreSoftware · L2 · AWS
@openstem
Software · L2 · AWSCollection5 items
01Compute & Networking
02Storage & Databases
03IAM & Security
+2 moreSoftware · L2 · Google Cloud
@openstem
Software · L2 · Google CloudCollection5 items
01Modules & Variables
02State Management
03Providers & Resources
+2 moreSoftware · L2 · Terraform
@openstem
Software · L2 · TerraformCollection2 items
01Async & Promises
02Performance & Memory
Software · L3 · JavaScript
@openstem
Software · L3 · JavaScriptCollection2 items
01Advanced Types (Conditional & Template Literal)
02Type-Level Programming
Software · L3 · TypeScript
@openstem
Software · L3 · TypeScriptCollection2 items
01Gotchas & Edge Cases
02Performance & Internals
Software · L3 · Python
@openstem
Software · L3 · PythonCollection2 items
01Performance
02Server Components & Suspense
Software · L3 · React
@openstem
Software · L3 · ReactCollection2 items
01Dynamic Programming
02Graphs & Traversals
Software · L3 · Data Structures & Algos
@openstem
Software · L3 · Data Structures & AlgosCollection2 items
01Message Queues & Streaming
02Scalability & Reliability
Software · L3 · System Design
@openstem
Software · L3 · System DesignCollection2 items
01Transactions & ACID
02Query Optimization
Software · L3 · SQL
@openstem
Software · L3 · SQLCollection2 items
01Rebase & Rewriting History
02Internals & Recovery
Software · L3 · Git & Dev Workflow
@openstem
Software · L3 · Git & Dev WorkflowCollection2 items
01Standard Library & Tooling
02Generics & Collections
Software · L3 · Go
@openstem
Software · L3 · GoCollection2 items
01Memory & Smart Pointers
02Concurrency & Async
Software · L3 · Rust
@openstem
Software · L3 · RustCollection2 items
01Concurrency & Threads
02JVM & Memory Model
Software · L3 · Java
@openstem
Software · L3 · JavaCollection2 items
01Browser Rendering & Performance
02CSS Architecture & Modern Selectors
Software · L3 · HTML & CSS
@openstem
Software · L3 · HTML & CSSCollection2 items
01Error Handling & Debugging
02Performance & Diagnostics
Software · L3 · Node.js
@openstem
Software · L3 · Node.jsCollection2 items
01TLS & HTTPS
02WebSockets & Real-time
Software · L3 · Networking & HTTP
@openstem
Software · L3 · Networking & HTTPCollection2 items
01Virtual Memory & Paging
02File Systems & I/O
Software · L3 · Operating Systems
@openstem
Software · L3 · Operating SystemsCollection2 items
01Concurrency Models
02Atomics & Memory Model
Software · L3 · Concurrency
@openstem
Software · L3 · ConcurrencyCollection2 items
01TLS & Network Security
02API & Access Control
Software · L3 · Security & Auth
@openstem
Software · L3 · Security & AuthCollection2 items
01Container Internals & Images
02Observability & Monitoring
Software · L3 · Docker & Kubernetes
@openstem
Software · L3 · Docker & KubernetesCollection2 items
01TDD & Coverage
02Test Architecture & Strategy
Software · L3 · Testing
@openstem
Software · L3 · TestingCollection2 items
01Anti-patterns & Refactoring
02Applying Patterns at Scale
Software · L3 · Design Patterns
@openstem
Software · L3 · Design PatternsCollection2 items
01Spring Security
02Data Access & JPA
Software · L3 · Spring Boot
@openstem
Software · L3 · Spring BootCollection3 items
01Isolates & Concurrency
02Streams & Async Generators
03VM, AOT/JIT & Performance
Software · L3 · Dart
@openstem
Software · L3 · DartCollection2 items
01Async & Networking
02Rendering Pipeline
Software · L3 · Flutter
@openstem
Software · L3 · FlutterCollection2 items
01Caching & Revalidation
02Middleware, Auth & Deployment
Software · L3 · Next.js
@openstem
Software · L3 · Next.js