# Backend Engineering Edho Ferdian

> >-

- **Type:** Skill
- **Install:** `agentstack add skill-edhoferdian-eef-backend-engineering-edho-ferdian`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [edhoferdian](https://agentstack.voostack.com/s/edhoferdian)
- **Installs:** 0
- **Category:** [Developer Tools](https://agentstack.voostack.com/c/developer-tools)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [edhoferdian](https://github.com/edhoferdian)
- **Source:** https://github.com/edhoferdian/EEF/tree/main/.hermes/skills/backend-engineering-edho-ferdian

## Install

```sh
agentstack add skill-edhoferdian-eef-backend-engineering-edho-ferdian
```

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

## About

# Backend Engineering — Edho Ferdian Mode

## Where this sits

- `api-design-edho-ferdian` decides the **contract** at the boundary.
- `data-layer-patterns-edho-ferdian` decides the **storage** behind it.
- This skill is the **middle**: how the code between them is layered, how it
  fails, and how it defers work.
- `code-review-edho-ferdian` reviews the result — in particular
  `silent-failure-lens.md`, which is the review-side mirror of
  `references/error-and-resilience.md` here. Cross-reference, never restate.

## References

- `references/error-and-resilience.md`
- `references/llm-pipelines.md` — regex-first parsing with confidence-scoring
  as the LLM gate, plus cost-aware model routing, budget tracking, retry
  policy, and prompt caching for pipelines that call an LLM API.
- `references/scheduled-collection.md` — unattended collect/enrich/store
  pipelines (scrapers, feed pollers, report builders): source selection,
  per-source failure isolation, LLM-enrichment batching and fallback,
  prompt-injection rules for untrusted scraped content, idempotent upsert,
  and cron/alerting operations. Covers the background-job concerns
  (idempotency, dead-letter-style backfill, run scheduling) for this class of
  job — see the note below for what it does not cover.
- `references/nestjs.md` — NestJS project structure (`common/`, `config/`,
  `modules//` with module-local DTOs), canonical bootstrap (global
  `ValidationPipe`, `ClassSerializerInterceptor`, `HttpExceptionFilter`), env
  validation at boot, repository/transaction placement, and background
  jobs/event consumers in their own modules. Not speculative — this is the
  framework behind `ghostfolio`, a real project in Edho's stack.
- `references/rails.md` — Rails 7.1+/8.x authoring: directory contract,
  when to extract a service/form/query object or ViewComponent, service
  result objects and transactions, ActiveRecord discipline (eager loading,
  callbacks, no `default_scope`), idempotent jobs, Hotwire, and the Rails 8
  Solid stack. Review and build-failure lenses for Ruby live in
  `language-code-review-edho-ferdian` and `build-fix-edho-ferdian`.

- `references/layering-and-boundaries.md` — ports & adapters (hexagonal
  architecture) with a framework-agnostic dependency-direction diagram, the
  repository-vs-service layer split with a misplaced-concern test, the
  composition root (NestJS DI and hand-wired bootstrap variants), a six-step
  migration playbook for entangled/legacy code, and a checklist for adding a
  new integration cleanly through the same port/adapter seam.
- `references/jobs-and-queues.md` — generic queue-backend reference, distinct
  from `references/scheduled-collection.md` (which covers the
  scheduled-collection job shape specifically): backend choice (BullMQ vs
  SQS vs Postgres-based pg-boss/graphile-worker), worker-pool concurrency
  sizing, retry/backoff classification, dead-letter queues generically, job
  idempotency keys, and queue observability.

## External docs (fixed — see skill-authoring-edho-ferdian's canonical contract)

Before using a fast-moving or rarely-touched framework/queue/ORM API surface
(new integration, version upgrade, NestJS/BullMQ/pg-boss specifics), resolve
it live via Context7 rather than from memory. Full contract:
`skill-authoring-edho-ferdian` §9.

## Surgical changes (fixed — see skill-authoring-edho-ferdian's canonical contract)

This skill inherits the default as-is: when extending or fixing an existing
service, error path, or job, change only what the task requires — don't
relayer or restructure adjacent, already-working code as a side effect. Full
contract: `skill-authoring-edho-ferdian` §10.

## Language routing (fixed — see skill-authoring-edho-ferdian's canonical contract)

Communication to the user in Bahasa Indonesia; code, comments, and any
generated files in English — fixed, never ask. Full contract:
`skill-authoring-edho-ferdian` §7.

## Source & license

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

- **Author:** [edhoferdian](https://github.com/edhoferdian)
- **Source:** [edhoferdian/EEF](https://github.com/edhoferdian/EEF)
- **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-edhoferdian-eef-backend-engineering-edho-ferdian
- Seller: https://agentstack.voostack.com/s/edhoferdian
- Browse the marketplace: https://agentstack.voostack.com/browse

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