# Software & AI Engineering Concepts

> A directory of software systems, LLM application engineering, and technical leadership concepts.

Author and maintainer: Saad Ahmed (https://github.com/iamsaad640).
This release lists concept names and reference links. Use the topic pages to locate terminology; they are not full tutorials.

## Directory

- [All topics](https://concepts.saad.run/docs/README.md)
- [Alphabetical index](https://concepts.saad.run/docs/glossary.md)

## Software engineering

- [Algorithms and data structures](https://concepts.saad.run/docs/software/algorithms.md)
- [Languages and runtimes](https://concepts.saad.run/docs/software/languages-and-runtimes.md)
- [Operating systems and hardware](https://concepts.saad.run/docs/software/operating-systems.md)
- [Concurrency and parallelism](https://concepts.saad.run/docs/software/concurrency.md)
- [Networking and protocols](https://concepts.saad.run/docs/software/networking.md)
- [Code design and maintainability](https://concepts.saad.run/docs/software/code-design.md)
- [Architecture and domain modeling](https://concepts.saad.run/docs/software/architecture.md)
- [APIs and integrations](https://concepts.saad.run/docs/software/api-design.md)
- [Rate limiting and admission control](https://concepts.saad.run/docs/software/rate-limiting.md)
- [Caching](https://concepts.saad.run/docs/software/caching.md)
- [Relational databases and SQL](https://concepts.saad.run/docs/software/relational-databases.md)
- [Transactions and concurrency control](https://concepts.saad.run/docs/software/transactions.md)
- [Nonrelational databases and search](https://concepts.saad.run/docs/software/nonrelational-and-search.md)
- [Distributed systems](https://concepts.saad.run/docs/software/distributed-systems.md)
- [Messaging and durable workflows](https://concepts.saad.run/docs/software/messaging.md)
- [Data engineering](https://concepts.saad.run/docs/software/data-engineering.md)
- [Reliability and resilience](https://concepts.saad.run/docs/software/reliability.md)
- [Observability and debugging](https://concepts.saad.run/docs/software/observability.md)
- [Performance and capacity](https://concepts.saad.run/docs/software/performance.md)
- [Security and privacy](https://concepts.saad.run/docs/software/security.md)
- [Infrastructure and cloud](https://concepts.saad.run/docs/software/infrastructure.md)
- [Testing and delivery](https://concepts.saad.run/docs/software/testing-and-delivery.md)
- [Frontend and client engineering](https://concepts.saad.run/docs/software/frontend.md)
- [SaaS and business workflows](https://concepts.saad.run/docs/software/saas-workflows.md)
- [Distributed key-value stores and Redis](https://concepts.saad.run/docs/software/distributed-key-value-stores.md)

## LLM applications

- [Model behavior and API integration](https://concepts.saad.run/docs/ai/model-integration.md)
- [Prompt engineering](https://concepts.saad.run/docs/ai/prompt-engineering.md)
- [Context engineering](https://concepts.saad.run/docs/ai/context-engineering.md)
- [Knowledge-base ingestion](https://concepts.saad.run/docs/ai/knowledge-bases.md)
- [Retrieval and RAG](https://concepts.saad.run/docs/ai/rag-and-retrieval.md)
- [Tools, function calling, and MCP](https://concepts.saad.run/docs/ai/tools-and-mcp.md)
- [Agent loop engineering](https://concepts.saad.run/docs/ai/loop-engineering.md)
- [Agent harness and orchestration](https://concepts.saad.run/docs/ai/harness-and-orchestration.md)
- [Memory engineering](https://concepts.saad.run/docs/ai/memory-engineering.md)
- [Planning, reasoning, and verification](https://concepts.saad.run/docs/ai/planning-and-verification.md)
- [Actions and side-effect safety](https://concepts.saad.run/docs/ai/action-safety.md)
- [Evaluation engineering](https://concepts.saad.run/docs/ai/evaluation.md)
- [LLM observability and debugging](https://concepts.saad.run/docs/ai/observability.md)
- [LLM application security](https://concepts.saad.run/docs/ai/security.md)
- [LLM performance and cost](https://concepts.saad.run/docs/ai/performance-and-cost.md)
- [LLM application UX](https://concepts.saad.run/docs/ai/application-ux.md)
- [Multimodal application integration](https://concepts.saad.run/docs/ai/multimodal-applications.md)

## Architecture and technical leadership

- [Technical strategy and architecture judgment](https://concepts.saad.run/docs/principal/technical-strategy.md)
- [Organizational engineering](https://concepts.saad.run/docs/principal/organizational-engineering.md)
- [Principal-level applied AI judgment](https://concepts.saad.run/docs/principal/applied-ai-strategy.md)