AI architecture diagram generator for backend engineers

Diagrams that think.Systems that ship.

Skeema turns a prompt into a production-quality architecture — then derives the ER schema, sequence flows, and code for every service. One workspace. One source of truth.

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S
SYSTEM ARCHITECTURE
interview-platformsaved
Search nodes⌘K
B 87~5K usersShareExport
CLIENTSGATEWAYCORE SERVICESDATA & EVENTSHTTPSJWTexecevaluatesubscriberesultscoreeventpersistcachesession
CLIENT#WEB
Web App
Next.js · React
HEALTHY820r/s
GATEWAY#API
API Gateway
Fastify · Node
CRITICAL2,356r/s
SERVICE#AUTH
Auth Service
TypeScript
HEALTHY820r/s
SERVICE#DBOX
Sandbox Exec
Firecracker VM
WARNING1,804r/s
SERVICE#AI
AI Evaluation
Python · FastAPI
BOTTLENECK2,212r/s
SERVICE#LING
Billing
Stripe webhooks
HEALTHY820r/s
QUEUE#AFKA
Kafka
event bus · 4 topics
WARNING1,804r/s
DATABASE#PG
PostgreSQL
primary · 5 entities
HEALTHY820r/s
CACHE#EDIS
Redis
cache + sessions
HEALTHY820r/s
Architecture diagramsER schemasSequence flowsAI agent graphsCI/CD pipelinesLoad simulationCost estimatesProduction code
01The problem

Every diagram tool stops at the diagram.

You draw an architecture. Then you redraw the ER schema from scratch. Then the sequence flow from scratch. Then you write the code with the diagram closed. Nothing stays in sync. Every artifact is an island.

That's not system design. That's documentation theater.

Skeema · one project, every view linked
interview-platform● synced4 views · 0 drift
Architecture✓ in sync
source of truth
ER schema✓ in sync
derived from PostgreSQL
users
id uuid · pk
email varchar · unique
role enum ← from diagram
Sequence · login✓ in sync
derived from Auth Service
Client → API: POST /login
API → Auth Service: verify
Auth Service → PostgreSQL
✓ rename applied everywhere
Code · handlers.ts✓ in sync
generated from v13
// from Auth Service · v13
export async function login()
  await db.users.findUnique(…)
✓ matches the diagram
Today · 4 tools, 4 files, 0 links
board-final-v3.excalidrawExcalidraw
schema.dbmldbdiagram
Table users {
  id uuid [pk]
  email varchar
  // role? not in diagram
}
login-flow.mmdMermaid
sequenceDiagram
Client->>API: POST /login
API->>Auth: verify
%% Auth svc renamed?
handlers.tsVS Code
export async function login()
  const u = await db.users…
  // TODO match the diagram
copied by handout of datenever linked

Drag the handle — or focus it and use the arrow keys.

01

Disconnected outputs

Architecture, ER schema, and sequence flows each live in their own file with nothing linking them together.

02

No system intelligence

The tool knows your shapes, not your services. No load simulation, no schema validation, no cost signal.

03

Code drifts immediately

Generated boilerplate never reflects what the diagram actually says — so the diagram rots the day you ship.

02The Skeema Approach

Three things, all connected.

The architecture is the source of truth. Every other view is derived from it — and stays linked.

01

Start with the system

Describe your backend in plain English. Skeema generates a production-quality architecture with realistic services, infrastructure, and async patterns.

S
SYSTEM ARCHITECTURE
interview-platformsaved
Search nodes⌘K
B 87~5K usersShareExport

Awaiting your prompt

Describe a system in the bar below. Skeema generates the architecture with every service connected.

Describe your stack, expected scale, and any constraints for a more accurate review.
Describe your system — e.g. "microservices with API gateway, Redis cache, Kafka"
Auto
⌘↵
Generate
02

Derive every view

Hover any node → generate an ER diagram for the database. A sequence diagram for the service. Production code for the API. All linked back to their source.

S
ER
interview-schemasaved
Search nodes⌘K
B 87~5K usersShareExport
belongs to
User6
iduuid
emailUQstring
namestring
roleenum
created_atdatetime
updated_atdatetime
Session5
iduuid
user_iduuid
statusenum
started_atdatetime
ended_at?datetime
Question4
iduuid
titlestring
difficultyenum
bodytext
JUNCTION
SessionQuestion3
iduuid
session_iduuid
question_iduuid
Submission6
iduuid
session_iduuid
question_iduuid
codetext
languageenum
created_atdatetime
Evaluation5
iduuid
submission_iduuid
scoredecimal
passedboolean
created_atdatetime
Schema Code
6 entities · 6 relations
PrismaPostgreSQLMySQLMongoose
1// Generated by Skeema
2// Add to schema.prisma — run `npx prisma migrate dev`
3 
4generator client {
5  provider = "prisma-client-js"
6}
7 
8datasource db {
9  provider = "postgresql"
10  url      = env("DATABASE_URL")
11}
12 
13enum SessionStatus {
14  PENDING
15  ACTIVE
16  COMPLETED
17}
18 
19model User {
20  id        String    @id @default(uuid())
21  email     String    @unique
22  name      String
23  role      Role
24  sessions  Session[]
25  createdAt DateTime  @default(now())
26}
derived from PostgreSQLin interview-platformlinked
03

One living project

Everything lives in a Skeema Project. Edit the architecture, and your derived views know. No more silent drift between diagram and code.

interview-platform● all views in sync7 boards
  • ARCHArchitecturesource of truth
  • ERinterview-schemafrom PostgreSQL
  • ERbilling-schemafrom Billing
  • SEQuser-loginfrom Auth Service
  • SEQrun-codefrom Sandbox Exec
  • CODEhandlers.tsfrom API Gateway
  • DOCSdocs.mdfrom the whole project
History
v10v11v12v13
v13 · Auth Service renamed → 3 derived views updated
03Live Demo

From prompt to system. Watch it build.

This is the actual Skeema workspace. Watch a prompt become a production architecture — services, async event flows, a live load simulation, and a schema health review. Switch tabs for ER and sequence diagrams.

9 services·11 connections·3 async event flows·generated in 8s
04The platform

Everything your system needs. In one place.

Not a drawing tool with AI bolted on. Simulation, cost modeling, schema analysis, code generation, and version control — built into every diagram from the first prompt.

Load simulation

Stress-test before you build

Dial from 100 to 100K concurrent users. Skeema computes per-path latencies, grades the architecture A–F, and names the exact bottleneck.

Cost estimator

Real cloud bills, pre-deploy

2026 AWS, GCP, and Azure SKUs mapped to every node — with auto-insights.

Schema health

Eleven rules. Zero bad schemas.

Missing keys, absent indexes, orphan entities — caught and graded automatically.

Code generation

Schemas become code instantly

Prisma, PostgreSQL, MySQL, and Mongoose — deterministic output, no AI cost, always in sync with the diagram.

Connected views

Derive from any node

Database nodes spawn ER diagrams. Services spawn API routes. Lineage tracked.

Version history

Diff any two versions

Color-coded diffs on canvas. Snapshot, restore, and review like code.

Flow analysis

Latency on every arrow

Critical paths, sync/async counts, and bottleneck flags on each sequence.

Use cases

One canvas, six jobs done properly.

Skeema replaces the diagram tool, the schema designer, the whiteboard cosplay, and the cost spreadsheet — each view generated, connected, and kept honest.

  • Describe a system in plain English — get a production-grade architecture diagram with services, gateways, queues, datastores, and sync/async edges laid out in domain zones.

    Architecture diagram docs →

  • Derive an entity-relationship diagram from any architecture, or paste a Prisma, PostgreSQL, or MySQL schema and get the ER view — keys, cardinality, junction tables — instantly.

    ER diagram docs →

  • Trace any request path into a sequence flow: lifelines, activation bars, async messages, and per-hop latency estimates that add up to a real budget.

    Sequence diagram docs →

  • Design LLM agent systems — models, tools, retrievers, memory, routers, human-in-the-loop — and replay the whole graph step by step with animated playback.

    AI agent docs →

  • Push simulated traffic through the diagram. Read P50/P95/P99 latency, watch the queue back up, and find the bottleneck before production finds it for you.

    Load simulation docs →

  • Real AWS, GCP, and Azure SKUs mapped to every node, scaled by your modeled traffic — see the monthly bill of an architecture before you build it.

    Cost estimation docs →
05Connected diagrams

One system. Every view connected.

Every diagram in Skeema knows where it came from. Your ER schema remembers it was derived from the Postgres node. Your sequence flow knows which services it spans. Edit the architecture, and the connections persist.

ARCHITECTUREinterview-platformsource
CLIENT#WEB
Web App
Next.js · React
GATEWAY#API
API Gateway
Fastify · Node
SERVICE#AUTH
Auth Service
TypeScript · Bun
DATABASE#PG
PostgreSQL
primary · 5 entities
SEQUENCEuser-loginfrom Auth Service
ClientAPI GatewayAuth Service
POST /login →verify(token) → Auth Service
CODEhandlers/login.tsfrom Auth Service
// service: auth-service
export async function login(req) {
  await authService.verify(req.token)
}
ERusersfrom PostgreSQL
id uuid · pkemail varcharrole enum
✓ 2 derived views updated · ER untouched · 0 drift
  1. 1Every view is derived from a node — and remembers which.
  2. 2Rename the source on the architecture…
  3. 3…and only the linked views follow. Zero drift.

Mint dot indicator

Every node with derived views gets a small mint dot — at a glance, you see what's already mapped.

Hover-strip action menu

Hover any node → a contextual action strip appears with only the actions that apply. No clutter.

Lineage tracking

Delete a source node? Skeema marks the derived board, doesn't break it. Move forward without fear.

06Project Docs

One click. Full project documentation.

Skeema reads your architecture, your ER schemas, and your flows — and writes the docs your team actually needs. Markdown. Versioned. Exportable.

OverviewBoardsDocsSettings
intervee-ai
AI-powered coding interview platform
14
nodes
3
ER schemas
5
flows
Last generated 3m agov4 · 1.2k tokens
Includes
Overview
Architecture
Data Model
Flows
Integrations
Tech Stack
docs.mdgenerated
# intervee-ai

An AI-powered coding interview platform featuring realtime candidate sessions, sandboxed code execution, asynchronous AI evaluation, and Stripe-billed subscriptions.

## Overview

The system handles up to 10,000 concurrent interview sessions, processes code submissions in isolated Firecracker microVMs, and pipelines evaluations through Kafka for asynchronous AI scoring.

## Architecture
  • Web App— Next.js client, server-rendered
  • API Gateway— Fastify · request routing, auth
  • AI Evaluation Service— Python · FastAPI · OpenAI
  • PostgreSQL— primary store · 5 entities
## Data Model

Five entities: users, interviews, submissions, scores, subscriptions. See linked ER diagram for full schema.

## Integrations
  • Stripe— subscriptions, webhooks
  • Kafka— 4 topics · evaluation.requested

Generated in real time · References real component names · Auto-regenerates on demand

9
diagram types, one engine
100K
concurrent users simulated
11
schema rules enforced
4
code dialects generated
A–F
every architecture graded
08Built for teams

For teams that actually ship.

Presence, reviews, comments, and full version history — collaboration that lives on the canvas, not in a separate doc.

interview-platformactivitysample data
PS

requested your review on Auth flow

v13 · 3 changes

Reviewnow

  1. Reviews + comments

    Request reviews, leave per-node comments, approve or request changes. Notifications throughout.

  2. Version history + diff

    Every change is a snapshot. Diff between any two versions with a visual overlay on the canvas.

  3. Live presence · coming with Team

    Collaborator avatars and real-time co-editing on every board arrive with the Team plan.

09Pricing

Simple. Honest.

Start free. Upgrade when you ship faster.

Free

Explore without a card

$0

free forever · no card

  • Unlimited boards
  • 5 AI generations / month
  • 3 AI chat messages / month
  • 2 load simulations / month
  • 100 nodes per board
  • PNG export (watermarked)
  • 5 version-history snapshots
  • Community support
Start Freeor try it first — no account
Most Popular

Pro

For developers who ship fast

$12 per month

billed monthly

  • Unlimited boards
  • 200 AI generations / month
  • 300 AI chat messages / month
  • 200 simulations / month
  • PNG, SVG, PDF, Markdown & HTML exports
  • Schema codegen + AI suggestions
  • Diff view + unlimited history
  • 5 collaborators per board
  • Priority email support
Start Pro
Coming soon

Team

For teams shipping together

Soon

launching after Pro

  • Everything in Pro
  • Unlimited collaborators
  • Shared org templates & playbooks
  • Cross-artifact consistency engine
  • SSO / SAML + audit logs
  • Centralized billing & seats
  • Dedicated support + onboarding

Free forever tier · No credit card required · Cancel anytime

10FAQ

Questions, answered.

How Skeema models systems, generates real code, and what's included in each plan.

Those tools draw shapes. Skeema models systems. Architecture nodes are real services with technology, async patterns, and load behavior — and they derive ER schemas, sequence flows, and production code that stay linked back to the source.

Need a hand?

Real humans — not bots. We typically reply within a few hours during business days.

support@skeema.cloud
Replies · within 1 business day

Stop drawing diagrams.Start designing systems.

Skeema is live. Describe your system, get a production-quality architecture, and ship it — free to start, no card required.