Architecture blueprints for modern software

Three reference architectures we use as starting points: a multi-tenant SaaS platform, an enterprise RAG pipeline and an offline-first mobile app. Use them to check your own design or as the basis for a conversation with our engineers.

For B2B SaaS products

Multi-tenant SaaS platform

Our reference architecture for B2B SaaS. It puts data isolation between tenants first, handles requests at the edge and distributes the application globally.

Stack

  • Next.js 16
  • PostgreSQL (RLS)
  • Redis Edge
  • Stripe
Discuss this architecture

  1. Edge

    • Edge (Vercel)

    Requests are served from the edge location closest to the user.

  2. Application

    • Auth middleware
    • Rate limiter

    Every request is authenticated and rate-limited before it reaches the business logic.

  3. Data

    • Postgres (RLS)
    • Redis cache

    Row-level security in Postgres keeps each tenant’s data separate; Redis caches frequent reads.

For search and answers over internal documents

Enterprise RAG pipeline

How we turn large document collections into a semantic search and answer system that runs securely inside your VPC, so your documents stay in your environment.

Stack

  • LangChain
  • Pinecone
  • Gemini 3.0
  • Docker
Discuss this architecture

  1. Ingestion

    • PDF / docs
    • Ingest worker

    An ingest worker reads your documents and splits them into chunks.

  2. Indexing

    • Embedding API
    • Vector DB

    Each chunk is converted into an embedding and stored in a vector database.

  3. Generation

    • LLM generation

    The most relevant chunks are retrieved and passed to the language model, which answers from them.

For field operations apps

Offline-first mobile sync

An architecture for apps that must keep working without an internet connection, in mines, hospitals or on aircraft.

Stack

  • React Native
  • WatermelonDB
  • Sync Engine
  • S3
Related services
Mobile app development
Discuss this architecture

  1. Device

    • Local DB

    The app reads and writes to a database on the device, so it keeps working without a connection.

  2. Sync

    • Sync engine

    When a connection is available, changes are exchanged in both directions.

  3. Server

    • Master DB (Postgres)

    The central Postgres database holds the shared record for all devices.

Further reading

Need an architecture for your own requirements?

We design systems for regulated industries such as fintech and medtech. Book a system design call and bring your constraints.

Book a call

Or write to us directly

hello@elitics.io+383 49 171 069

Dukagjini Center, Prishtina, Kosovo