# Backend Engineering

> Design services that are reliable, observable, secure, and maintainable

- **Type:** Skill
- **Install:** `agentstack add skill-vignesh2027-ai-agent-skills-backend-engineering`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [vignesh2027](https://agentstack.voostack.com/s/vignesh2027)
- **Installs:** 0
- **Category:** [AI & ML](https://agentstack.voostack.com/c/ai-and-ml)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [vignesh2027](https://github.com/vignesh2027)
- **Source:** https://github.com/vignesh2027/AI-AGENT-SKILLS/tree/main/skills/backend-engineering

## Install

```sh
agentstack add skill-vignesh2027-ai-agent-skills-backend-engineering
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

## Overview

Backend services are the load-bearing walls of software systems. They must be reliable under partial failure, observable in production, and secure against malicious input. This skill applies the engineering discipline required for production-grade services.

## When to Use

- Before implementing a new service or significant backend feature
- When a service has reliability, performance, or security issues
- As part of the `/review` workflow for backend PRs

## Process

### Step 1: Define the contract
Document: endpoints/methods, request/response schemas, error codes, authentication requirements, rate limits. No implementation before the contract is defined.

### Step 2: Design for failure
Every outbound call must have: timeout, retry with backoff, circuit breaker, fallback. Services that don't handle dependency failures will fail when their dependencies fail.

### Step 3: Input validation at the boundary
Validate all incoming data before processing: types, required fields, length limits, format constraints. Reject invalid input — don't try to fix it.

### Step 4: Idempotency for mutations
All write operations should be idempotent where possible. Use idempotency keys for payment and other sensitive operations.

### Step 5: Database access
- No N+1 queries
- Transactions for operations that must be atomic
- Read replicas for read-heavy workloads
- Connection pooling configured

### Step 6: Logging and observability
Implement structured logging, metrics (four golden signals), and distributed tracing. See `observability-and-monitoring`.

### Step 7: Security
- Authenticate every request
- Authorize every resource access
- Validate all inputs
- No secrets in logs or responses
See `security-and-hardening`.

### Step 8: Graceful shutdown
Handle: SIGTERM, drain in-flight requests, close database connections, flush logs. Services that don't handle graceful shutdown cause errors during deployments.

## Verification Requirements

- [ ] Contract documented before implementation
- [ ] All outbound calls have timeout and retry
- [ ] Input validation at the service boundary
- [ ] No N+1 queries
- [ ] Authentication and authorization on every request/resource
- [ ] Graceful shutdown implemented
- [ ] Four golden signals instrumented

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [vignesh2027](https://github.com/vignesh2027)
- **Source:** [vignesh2027/AI-AGENT-SKILLS](https://github.com/vignesh2027/AI-AGENT-SKILLS)
- **License:** MIT

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-vignesh2027-ai-agent-skills-backend-engineering
- Seller: https://agentstack.voostack.com/s/vignesh2027
- Browse the marketplace: https://agentstack.voostack.com/browse

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Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.