Scalable System Design

I've been building and deploying RAG systems for 2+ years. And it's taught me optimizing them requires focusing on 3 core stages: 1. Pre-Retrieval 2. Retrieval 3. Post-Retrieval Let me explain - Most people focus on the generation side of things. But optimizing retrieval is what really makes the difference. Here's how to do it: 𝟭/ 𝗣𝗿𝗲-𝗿𝗲𝘁𝗿𝗶𝗲𝘃𝗮𝗹 This is where we optimize the data before the retrieval process even begins. The goal? Structure your data for efficient indexing and ensure the query is as precise as possible before it's embedded and sent to your vector DB. Here’s how: - 𝗦𝗹𝗶𝗱𝗶𝗻𝗴 𝘄𝗶𝗻𝗱𝗼𝘄: 𝘐𝘯𝘵𝘳𝘰𝘥𝘶𝘤𝘦 𝘤𝘩𝘶𝘯𝘬 𝘰𝘷𝘦𝘳𝘭𝘢𝘱 𝘵𝘰 𝘳𝘦𝘵𝘢𝘪𝘯 𝘤𝘰𝘯𝘵𝘦𝘹𝘵 𝘢𝘯𝘥 𝘪𝘮𝘱𝘳𝘰𝘷𝘦 𝘳𝘦𝘵𝘳𝘪𝘦𝘷𝘢𝘭 𝘢𝘤𝘤𝘶𝘳𝘢𝘤𝘺. - 𝗘𝗻𝗵𝗮𝗻𝗰𝗶𝗻𝗴 𝗱𝗮𝘁𝗮 𝗴𝗿𝗮𝗻𝘂𝗹𝗮𝗿𝗶𝘁𝘆: 𝘊𝘭𝘦𝘢𝘯, 𝘷𝘦𝘳𝘪𝘧𝘺, 𝘢𝘯𝘥 𝘶𝘱𝘥𝘢𝘵𝘦 𝘥𝘢𝘵𝘢 𝘧𝘰𝘳 𝘴𝘩𝘢𝘳𝘱𝘦𝘳 𝘳𝘦𝘵𝘳𝘪𝘦𝘷𝘢𝘭. - 𝗠𝗲𝘁𝗮𝗱𝗮𝘁𝗮: 𝘜𝘴𝘦 𝘵𝘢𝘨𝘴 (𝘭𝘪𝘬𝘦 𝘥𝘢𝘵𝘦𝘴 𝘰𝘳 𝘦𝘹𝘵𝘦𝘳𝘯𝘢𝘭 𝘐𝘋𝘴) 𝘵𝘰 𝘪𝘮𝘱𝘳𝘰𝘷𝘦 𝘧𝘪𝘭𝘵𝘦𝘳𝘪𝘯𝘨. - 𝗦𝗺𝗮𝗹𝗹-𝘁𝗼-𝗯𝗶𝗴 (or parent) 𝗶𝗻𝗱𝗲𝘅𝗶𝗻𝗴: 𝘜𝘴𝘦 𝘴𝘮𝘢𝘭𝘭𝘦𝘳 𝘤𝘩𝘶𝘯𝘬𝘴 𝘧𝘰𝘳 𝘦𝘮𝘣𝘦𝘥𝘥𝘪𝘯𝘨 𝘢𝘯𝘥 𝘭𝘢𝘳𝘨𝘦𝘳 𝘤𝘰𝘯𝘵𝘦𝘹𝘵𝘴 𝘧𝘰𝘳 𝘵𝘩𝘦 𝘧𝘪𝘯𝘢𝘭 𝘢𝘯𝘴𝘸𝘦𝘳. - 𝗤𝘂𝗲𝗿𝘆 𝗼𝗽𝘁𝗶𝗺𝗶𝘇𝗮𝘁𝗶𝗼𝗻: 𝘛𝘦𝘤𝘩𝘯𝘪𝘲𝘶𝘦𝘴 𝘭𝘪𝘬𝘦 𝘲𝘶𝘦𝘳𝘺 𝘳𝘰𝘶𝘵𝘪𝘯𝘨, 𝘲𝘶𝘦𝘳𝘺 𝘳𝘦𝘸𝘳𝘪𝘵𝘪𝘯𝘨, 𝘢𝘯𝘥 𝘏𝘺𝘋𝘌 𝘤𝘢𝘯 𝘳𝘦𝘧𝘪𝘯𝘦 𝘵𝘩𝘦 𝘳𝘦𝘴𝘶𝘭𝘵𝘴. 𝟮/ 𝗥𝗲𝘁𝗿𝗶𝗲𝘃𝗮𝗹 The magic happens here. Your goal is to improve the embedding models and leverage DB filters to retrieve the most relevant data based on semantic similarity. - Fine-tune your embedding models or use instructor models like instructor-xl for domain-specific terms. - Use hybrid search to blend vector and keyword search for more precise results. - Use GraphDBs or multi-hop techniques to capture relationships within your data. 𝟯. 𝗣𝗼𝘀𝘁-𝗿𝗲𝘁𝗿𝗶𝗲𝘃𝗮𝗹 At this stage, your task is to filter out noise and compress the final context before sending it to the LLM. - Use prompt compression techniques. - Filter out irrelevant chunks to avoid adding noise to the augmented prompt (e.g., using reranking) 𝗥𝗲𝗺𝗲𝗺𝗯𝗲𝗿: RAG optimization is an iterative process. Experiment with various techniques, measure their effectiveness, compare them and refine them. Ready to step up your RAG game? Check out the link in the comments.

𝗕𝘂𝗶𝗹𝗱𝗶𝗻𝗴 𝗮 𝗦𝗰𝗮𝗹𝗮𝗯𝗹𝗲 𝗔𝗜 𝗔𝗴𝗲𝗻𝘁 𝗜𝘀𝗻’𝘁 𝗝𝘂𝘀𝘁 𝗔𝗯𝗼𝘂𝘁 𝘁𝗵𝗲 𝗠𝗼𝗱𝗲𝗹 — 𝗜𝘁’𝘀 𝗔𝗯𝗼𝘂𝘁 𝘁𝗵𝗲 𝗔𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁𝘂𝗿𝗲. In the age of Agentic AI, designing a scalable agent requires more than just fine-tuning an LLM. You need a solid foundation built on three key pillars: 𝟭. 𝗖𝗵𝗼𝗼𝘀𝗲 𝘁𝗵𝗲 𝗥𝗶𝗴𝗵𝘁 𝗙𝗿𝗮𝗺𝗲𝘄𝗼𝗿𝗸 → Use modular frameworks like 𝗔𝗴𝗲𝗻𝘁 𝗦𝗗𝗞, 𝗟𝗮𝗻𝗴𝗚𝗿𝗮𝗽𝗵, 𝗖𝗿𝗲𝘄𝗔𝗜, and 𝗔𝘂𝘁𝗼𝗴𝗲𝗻 to structure autonomous behavior, multi-agent collaboration, and function orchestration. These tools let you move beyond prompt chaining and toward truly intelligent systems. 𝟮. 𝗖𝗵𝗼𝗼𝘀𝗲 𝘁𝗵𝗲 𝗥𝗶𝗴𝗵𝘁 𝗠𝗲𝗺𝗼𝗿𝘆 → 𝗦𝗵𝗼𝗿𝘁-𝘁𝗲𝗿𝗺 𝗺𝗲𝗺𝗼𝗿𝘆 allows agents to stay aware of the current context — essential for task completion. → 𝗟𝗼𝗻𝗴-𝘁𝗲𝗿𝗺 𝗺𝗲𝗺𝗼𝗿𝘆 provides access to historical and factual knowledge — crucial for reasoning, planning, and personalization. Tools like 𝗭𝗲𝗽, 𝗠𝗲𝗺𝗚𝗣𝗧, and 𝗟𝗲𝘁𝘁𝗮 support memory injection and context retrieval across sessions. 𝟯. 𝗖𝗵𝗼𝗼𝘀𝗲 𝘁𝗵𝗲 𝗥𝗶𝗴𝗵𝘁 𝗞𝗻𝗼𝘄𝗹𝗲𝗱𝗴𝗲 𝗕𝗮𝘀𝗲 → 𝗩𝗲𝗰𝘁𝗼𝗿 𝗗𝗕𝘀 enable fast semantic search. → 𝗚𝗿𝗮𝗽𝗵 𝗗𝗕𝘀 and 𝗞𝗻𝗼𝘄𝗹𝗲𝗱𝗴𝗲 𝗚𝗿𝗮𝗽𝗵𝘀 support structured reasoning over entities and relationships. → Providers like 𝗪𝗲𝗮𝘃𝗶𝗮𝘁𝗲, 𝗣𝗶𝗻𝗲𝗰𝗼𝗻𝗲, and 𝗡𝗲𝗼𝟰𝗷 offer scalable infrastructure to handle large-scale, heterogeneous knowledge. 𝗕𝗼𝗻𝘂𝘀 𝗟𝗮𝘆𝗲𝗿: 𝗜𝗻𝘁𝗲𝗴𝗿𝗮𝘁𝗶𝗼𝗻 & 𝗥𝗲𝗮𝘀𝗼𝗻𝗶𝗻𝗴 → Integrate third-party tools via APIs → Use 𝗠𝗖𝗣 (𝗠𝘂𝗹𝘁𝗶-𝗖𝗼𝗺𝗽𝗼𝗻𝗲𝗻𝘁 𝗣𝗿𝗼𝘁𝗼𝗰𝗼𝗹) 𝘀𝗲𝗿𝘃𝗲𝗿𝘀 for orchestration → Implement custom 𝗿𝗲𝗮𝘀𝗼𝗻𝗶𝗻𝗴 𝗳𝗿𝗮𝗺𝗲𝘄𝗼𝗿𝗸𝘀 to enable task decomposition, planning, and decision-making Whether you're building a personal AI assistant, autonomous agent, or enterprise-grade GenAI solution—𝘀𝗰𝗮𝗹𝗮𝗯𝗶𝗹𝗶𝘁𝘆 𝗱𝗲𝗽𝗲𝗻𝗱𝘀 𝗼𝗻 𝘁𝗵𝗼𝘂𝗴𝗵𝘁𝗳𝘂𝗹 𝗱𝗲𝘀𝗶𝗴𝗻 𝗰𝗵𝗼𝗶𝗰𝗲𝘀, 𝗻𝗼𝘁 𝗷𝘂𝘀𝘁 𝗯𝗶𝗴𝗴𝗲𝗿 𝗺𝗼𝗱𝗲𝗹𝘀. Are you using these components in your architecture today?

Scaling AI agents is not just about using a bigger model. It is about designing the system so agents can handle more users, more tools, more context, and more tasks without breaking latency, cost, or reliability. As agent workloads grow, the bottleneck moves from “can the model answer?” to: Can the system route requests correctly? Can it reuse repeated work? Can tools run in parallel? Can context stay small and relevant? Can failures be observed and recovered? Here are 9 agent scaling strategies every AI engineer should understand: 𝗛𝗼𝗿𝗶𝘇𝗼𝗻𝘁𝗮𝗹 𝗦𝗰𝗮𝗹𝗶𝗻𝗴 Distribute traffic across multiple agent instances to improve throughput and resilience. 𝗠𝗼𝗱𝗲𝗹 𝗥𝗼𝘂𝘁𝗶𝗻𝗴 Send each task to the right model based on complexity, cost, speed, and modality. 𝗖𝗮𝗰𝗵𝗶𝗻𝗴 Reuse repeated responses, retrieval results, or computations to reduce latency and model calls. 𝗤𝘂𝗲𝘂𝗲-𝗕𝗮𝘀𝗲𝗱 𝗘𝘅𝗲𝗰𝘂𝘁𝗶𝗼𝗻 Place tasks in queues so workers can process workloads reliably and asynchronously. 𝗣𝗮𝗿𝗮𝗹𝗹𝗲𝗹 𝗧𝗼𝗼𝗹 𝗨𝘀𝗲 Run independent tools at the same time, such as search, database calls, APIs, or code tools. 𝗖𝗼𝗻𝘁𝗲𝘅𝘁 𝗢𝗽𝘁𝗶𝗺𝗶𝘇𝗮𝘁𝗶𝗼𝗻 Trim, summarize, and prioritize only the most relevant context before sending it to the model. 𝗥𝗲𝘁𝗿𝗶𝗲𝘃𝗮𝗹 𝗢𝗳𝗳𝗹𝗼𝗮𝗱𝗶𝗻𝗴 Use RAG to fetch only the knowledge needed instead of loading everything into the agent context. 𝗠𝘂𝗹𝘁𝗶-𝗔𝗴𝗲𝗻𝘁 𝗗𝗲𝗹𝗲𝗴𝗮𝘁𝗶𝗼𝗻 Assign specialized tasks to research, coding, analyst, or reviewer agents coordinated by a manager. 𝗢𝗯𝘀𝗲𝗿𝘃𝗮𝗯𝗶𝗹𝗶𝘁𝘆 & 𝗔𝘂𝘁𝗼𝘀𝗰𝗮𝗹𝗶𝗻𝗴 Track latency, errors, tokens, tool failures, and demand so capacity adjusts automatically. The real lesson: Agents do not scale only through intelligence. They scale through architecture. Routing, caching, queues, parallelism, retrieval, monitoring, and autoscaling turn agent demos into production systems. Which scaling strategy do you think matters most for enterprise agents?

Rethinking Vector Search: Beyond Nearest Neighbors with Semantic Compression and Graph-Augmented Retrieval Traditional vector databases rely on approximate nearest neighbor (ANN) search to retrieve the top-k closest vectors to a query. While effective for local relevance, this approach often yields semantically redundant results-missing the diversity and contextual richness required by modern AI applications like RAG systems and multi-hop QA. The Problem with Proximity-Based Retrieval: Current ANN methods prioritize geometric distance but don't explicitly account for semantic diversity or coverage. This leads to retrieval results clustered in a single dense region, often missing semantically related but spatially distant content. Enter Semantic Compression: Researchers from Carnegie Mellon University, Stanford University, Boston University, and LinkedIn have introduced a new retrieval paradigm that selects compact, representative vector sets capturing broader semantic structure. The approach formalizes retrieval as a submodular optimization problem, balancing coverage (how well selected vectors represent the semantic space) with diversity (promoting selection of semantically distinct items). Graph-Augmented Vector Retrieval: The paper proposes overlaying semantic graphs atop vector spaces using kNN connections, clustering relationships, or knowledge-based links. This enables multi-hop, context-aware search through techniques like Personalized PageRank, allowing discovery of semantically diverse but non-local results. How It Works Under the Hood: The system operates in two stages: first, standard ANN retrieval generates candidates, then a greedy optimization algorithm selects the final subset. For graph-augmented retrieval, relevance scores propagate through both vector similarity and graph connectivity using hybrid scoring that combines geometric proximity with graph-based influence. Real Impact: Experiments show graph-based methods with dense symbolic connections significantly outperform pure ANN retrieval in semantic diversity while maintaining high relevance. This addresses critical limitations in applications requiring broad semantic coverage rather than just local similarity. This work represents a fundamental shift toward meaning-centric vector search systems, emphasizing hybrid indexing and structured semantic retrieval for next-generation AI applications.

How can Data Engineers leverage the open-source AI stack to build innovative solutions? Storage and Vector Operations: ->PostgreSQL with pgvector enables storing and querying embeddings directly in your database, perfect for semantic search applications. ->Combine this with FAISS for high-performance similarity search when dealing with millions of vectors. ->For example, you can build a document retrieval system that finds relevant technical documentation based on semantic similarity. Data Pipeline Orchestration: ->Netflix's Metaflow shines for ML workflows, allowing you to build reproducible, versioned data pipelines. ->You can create pipelines that preprocess data, generate embeddings, and update your vector store automatically. ->Useful for maintaining up-to-date knowledge bases that feed into RAG applications. Embedding Generation at Scale: ->Tools like Nomic and JinaAI help generate embeddings efficiently. ->You can build batch processing systems that convert large document repositories into vector representations, essential for building enterprise search systems or content recommendation engines. Model Deployment Infrastructure: ->FastAPI combined with Langchain provides a robust framework for deploying AI endpoints. ->You can build APIs that handle both traditional data operations and AI inference, making it easier to integrate AI capabilities into existing data platforms. Retrieval and Augmentation: ->Weaviate and Milvus excel at vector storage and retrieval at scale. ->Can be used to build systems that combine structured data from your data warehouse with unstructured data through vector similarity, enabling hybrid search solutions that leverage both traditional SQL and vector similarity. Here are some Real-world applications that can be explored: ➡️ Document intelligence systems that automatically categorize and route internal documents Ref: - Building Document Understanding Systems with LangChain: https://lnkd.in/gFgfSbwr - Learn Vector Embeddings with Weaviate's Documentation: https://lnkd.in/g96ym4BJ - pgvector Tutorial for Document Search: https://lnkd.in/gue4gzcs ➡️ Customer support systems that leverage historical ticket data for automated response generation Ref: - RAG (Retrieval Augmented Generation) with LlamaIndex: https://lnkd.in/gAM6_2fv ➡️ Product recommendation engines that combine traditional collaborative filtering with semantic similarity Ref: - FAISS for Similarity Search: https://lnkd.in/gTuCgyBE - AWS Personalize: https://lnkd.in/ggNar5xU ➡️ Data quality monitoring systems that use embeddings to detect anomalies in data patterns Ref: - Great Expectations: https://lnkd.in/g7JjGjBu - Azure ML Data Drift: https://lnkd.in/geYTXBXd Inspired by: ByteByteGo #dataengineering #artificialintelligence #innovation #ML #cloud

Mid-level DEs draw data flows. Senior DEs ask about scale. Staff DEs design for trade-offs. That's the system design gap. System design isn't picking Snowflake over BigQuery. It's knowing WHY you'd pick either — and what you'd give up. Here's the 7-layer framework every Senior DE thinks through 👇 𝟭. 𝗥𝗲𝗾𝘂𝗶𝗿𝗲𝗺𝗲𝗻𝘁𝘀 → What data are you working with? (volume, velocity, variety) → Who consumes it? (engineers, analysts, ML, end users) → What latency is needed? (real-time = seconds, batch = hours) → What scale? (10K rows or 10 billion?) If you skip this layer, every other decision is a guess. 𝟮. 𝗜𝗻𝗴𝗲𝘀𝘁𝗶𝗼𝗻 → Batch (every few hours) vs Streaming (continuous) → Pull (you fetch on a schedule) vs Push (data arrives at you) → CDC — Change Data Capture (only the changes, not the full table) Most pipelines break here first. Upstream schema changes are silent killers. 𝟯. 𝗦𝘁𝗼𝗿𝗮𝗴𝗲 → Warehouse — structured, fast queries (Snowflake, BigQuery, Redshift) → Lake — raw, cheap, flexible (S3, GCS, ADLS) → Lakehouse — best of both worlds (Iceberg, Delta Lake, Hudi) Pick based on access pattern. Not on what's trending. 𝟰. 𝗣𝗿𝗼𝗰𝗲𝘀𝘀𝗶𝗻𝗴 → Batch — Spark, dbt (transform after the data lands) → Streaming — Flink, Kafka Streams (transform as data flows) → Micro-batch — Spark Structured Streaming (the middle ground) The right choice = latency need vs cost vs operational complexity. 𝟱. 𝗦𝗲𝗿𝘃𝗶𝗻𝗴 → Analytics — dashboards + BI (Tableau, Looker, Metabase) → ML — feature stores + model serving APIs → Reverse ETL — push warehouse data back to operational tools (Salesforce, ad platforms) The real question: where does value actually leave the pipeline? 𝟲. 𝗢𝗿𝗰𝗵𝗲𝘀𝘁𝗿𝗮𝘁𝗶𝗼𝗻 → Schedule, dependencies, retries — Airflow, Dagster, Prefect → The brain that decides when things run, in what order Without this, you have scripts. Not a system. 𝟳. 𝗢𝗯𝘀𝗲𝗿𝘃𝗮𝗯𝗶𝗹𝗶𝘁𝘆 → Monitoring — is the pipeline running? → Lineage — where did this number come from? → Data quality — does the data look right? The 2 AM pages get caught here. Or they don't, and a CFO sees wrong numbers in the boardroom. The trade-off mindset is what hiring managers actually test for. Not "do you know Kafka." But "would you use Kafka here, and what would you give up by choosing it?" ------------ I built a complete Data Engineering System Design learning path on DataVidhya, covering every layer above with real-world architecture walkthroughs (Uber, Netflix, Spotify) and design questions you can practice on. → Free to start: https://lnkd.in/da_jv3yw #dataengineer #dataengineering #systemdesign

How Netflix Built a Real Time Graph with #ApacheKafka, #ApacheFlink, and #ApacheIceberg Netflix just shared how they built a Real Time #DistributedGraph to connect user actions across video, ads, live events, and games. All in the moment and at massive scale. Using Apache Kafka for ingestion and Apache Flink for real time #StreamProcessing, they process millions of events per second. Each action in the #Netflix app becomes part of a graph structure, built and updated in real time. The data is stored long term using #ApacheIceberg, allowing backfills and analytics. This approach replaces complex joins and brittle batch pipelines. It gives Netflix the power to run fast, relationship-based queries for smarter #personalization and insight. Scaling was a challenge. Netflix moved from one large Flink job to many topic-specific ones, making it easier to tune and operate. The result: over five million graph records processed per second. A textbook example of a #StreamingFirst architecture built on a #DataStreaming Platform.

Everyone's building RAG apps. Nobody tells you which vector store to actually use. The decision I see developers get wrong every week: They pick the flashiest option. Not the right one for their stage. Here's the cheat sheet I wish existed when I started 👇 → Just prototyping? Chroma or FAISS — in-process, zero setup → On Postgres already? pgvector — vectors + SQL, no new system → Vector search is your product? Qdrant — Docker-simple, scales to enterprise → Zero ops, just ship? Pinecone — managed SaaS, done → Need keyword + vector hybrid? Elasticsearch or OpenSearch → Billions of vectors, own your infra? Milvus or Vespa The mistake isn't picking the wrong tool. It's picking an enterprise tool for a prototype. Or a prototype tool for production. Category first. Features second. 🎯 We've mapped all 16 options across 4 categories so you don't have to. Diagram below 👇

What Netflix Actually Taught Us About Live Streaming After the Tyson–Paul live event exposed some very public cracks, Netflix did something unusually useful: it published a five-part technical breakdown of how it built live streaming at scale. This article on the Streaming Learning Center summarizes the key lessons from each post and highlights what’s reusable at a scale well below Netflix's. Behind the Streams: Live at Netflix: How Netflix rebuilt its control plane to survive massive, synchronized play storms, handling millions of simultaneous session requests without cascading retries or metadata failures. Building a Reliable Cloud Live Streaming Pipeline: A detailed look at cloud-based ingest, redundancy, and encoding pipelines, and how Netflix replaced traditional broadcast infrastructure with automated cloud workflows. Real-Time Recommendations for Live Events: Why live events break traditional caching and recommendation systems, and how Netflix combined prefetching with broadcast triggers to update over 100 million devices without melting backend services. Netflix Live Origin: An inside look at the custom live origin layer that decouples publishing from read storms, isolates failures, and keeps latency predictable under extreme concurrency. Building a Robust Ads Event Processing Pipeline: How Netflix scaled ad telemetry, metadata, and billing signals for live and VOD without overwhelming devices or downstream systems. Even if your service volume never approaches Netflix traffic levels, the architectural patterns around surge control, observability, and failure isolation still apply.