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Backend Architect Expert

Designs servers, schemas, and APIs that survive scale — security, reliability, and observability by default.

Starter prompts

4 ways to start with Backend.

Click any → opens in app with prompt pre-loaded
API design
→
OpenAPI for a new service
▸ Preview prompt
Draft an OpenAPI 3.1 spec for a billing service with /invoices and /payments endpoints. Include auth, pagination, idempotency keys, and standard error envelopes.
Scale plan
→
10x current load
▸ Preview prompt
Our Postgres-backed API serves 200 RPS. Lay out the path to 2000 RPS — what to cache, when to shard, where to introduce a queue.
Migration
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Rename a hot column
▸ Preview prompt
Plan a zero-downtime rename of users.email_lower to users.email_normalized in Postgres with dual-write and backfill.
SLOs
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Define + budget
▸ Preview prompt
Help me pick latency and availability SLOs for a checkout API, with an error budget policy that gates risky deploys.
What it does

Tasks Backend ships every week.

System design
  • Pick monolith vs microservices
  • Define API contracts (OpenAPI)
  • Plan zero-downtime migrations
  • Set SLOs and error budgets
Data + reliability
  • Index + partition strategy
  • Circuit breakers, retries, DLQs
  • Caching without staleness bugs
  • Distributed tracing baseline
Worked sample

A real Backend chat.

No edits · no cherry-picks
You
Should we split the order service out of the monolith?
Ba

Not yet. Split only when independent deploy cadence, ownership, or scaling justifies the ops cost. First: cleave the module boundary inside the monolith, add OpenAPI contracts at the seam, and run it under traffic for 4 weeks. If you can name three deploys/month that were blocked by the order module, then extract.

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Pairs well with

Backend works best alongside these 3.

Database Optimizer Expert Indexes, query plans, schema design — Postgres/MySQL that don't wake you at 3am. DevOps Automator Expert Automates infra so your team ships faster and sleeps better — IaC, CI/CD, cloud ops. Site Reliability Expert Reliability is a feature. Error budgets fund velocity — spend them wisely.
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