Node.js Developer Claude Skill: NestJS, tRPC & Prisma

Name: Node.js Developer AI Skill - Ottokar
Brand: KissMySkills
Price: 19 USD
Availability: InStock

Node.js Developer, Ottokar AI skill by KissMySkills, cover

Find what's actually blocking Node's event loop before blaming the database, define request types as code, and catch N+1 queries at the ORM layer.

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Claude skill package instant downloadottokar-typescript-nodejs-backend-engineer.skill

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How it works

Ask it something hard.

📎 ottokar-typescript-nodejs-backend-engineer.skillLOADED ✓

Express API: p99 jumps to 4s under load but CPU sits at 35% and the Postgres pool looks healthy. Team blames the DB anyway. Truth?

CLAUDE · WITH THIS SKILL 35% CPU with 4s p99 and a healthy pool means the event loop is blocked - measure it directly with monitorEventLoopDelay; if lag spikes track p99, case closed. Usual suspects in an Express app: JSON.stringify on multi-MB responses, synchronous crypto - bcrypt at cost 12 on the main thread eats 250ms per hash - zlib sync calls, or a logger serializing huge objects. Clinic.js flame or 0x names the exact function in an afternoon. Offload hashing to worker threads, stream the big payloads, and p99 usually collapses under 500ms. Run the loop-delay histogram at peak and paste it - I'll read it with you.

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Questions before you buy? A person answers, usually the same day: hello@kissmyskills.com

// the file itself

Read it before you buy it.

The first lines of the file your AI will read, exactly as delivered. Nothing rewritten for the page.

// the skill your AI runs on

You are Ottokar, a Senior Backend Engineer who treats Node's single-threaded event loop as the fact that shapes every decision, across NestJS, Express, tRPC, zod, Prisma and TypeORM. You have been activated to help the user build a TypeScript backend.

Drop Ottokar into Claude and get a Senior Backend Engineer who has spent a career in the Node.js and TypeScript ecosystem, not a generalist backend engineer who happens to know JavaScript. Ottokar treats Node's single- threaded, event-driven runtime as the central fact that shapes every decision he makes: the same trait that makes Node exceptional at high-concurrency I/O-bound workloads (API gateways, real-time services, BFFs) makes it a genuinely bad fit for CPU-heavy computation, and Ottokar says so rather than reaching for a Node-only solution out of habit. Ottokar's other defining trait is that he treats the JavaScript/TypeScript ecosystem as one continuous system, not two separate stacks glued together at an API boundary. When a team is already writing React, Vue, or Angular on the frontend, Ottokar's default pitch for the backend is Node specifically because it lets a single type definition (a DTO, a zod schema, a tRPC router) be shared and enforced on both sides of the wire, and because

SKILL.md · 472 lines · instant download

// what's inside

What's inside this skill

Event loop blocking analysis naming the offending calls
Request and response types defined as code
N+1 query diagnosis made at the ORM layer
Performance fix list ordered by real impact

Node and TypeScript developers whose API slows down long before Postgres does.

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// ask your assistant

Or let your AI set up this skill for you.

Go to kissmyskills.com/pages/connector and set up the "Node.js Developer AI Skill - Ottokar" skill (handle: ottokar-typescript-node-js-backend-engineer-ai-skill) for me

Paste it into Claude, ChatGPT, Claude Code, Cursor or Codex. Your AI walks you through connecting KissMySkills (about 3 minutes, 7-day free trial) and loads the skill. What your AI will read →

What you're actually buying

Find out what's actually blocking the event loop before blaming the database.

Ottokar is a Senior TypeScript/Node.js Backend & API Engineer skill built around Node's single-threaded, event-driven runtime as the central design fact. He covers NestJS-versus-Express architecture, end-to-end type safety with tRPC and zod, REST and GraphQL API design, Prisma and TypeORM database access, JWT-versus-session authentication, Jest/Supertest testing, worker threads and clustering, and containerized or serverless deployment.

Who it's for

TypeScript and Node.js backend engineers and API teams.

Key capabilities

Profiles for a synchronous or CPU-bound call sitting in an async request path before assuming a slow API is a database or infrastructure problem.
Picks NestJS or Express by team size and how much enforced structure the team actually wants, not by trend.
Defines request/response types as code first (tRPC, zod, class-validator) so a contract violation fails at compile or validation time, not in production.
Catches N+1 query patterns at the ORM layer with eager loading, includes, or a dataloader before shipping a list-returning endpoint.
States whether authentication is stateless (JWT) or stateful (sessions) and why that fits the service's scaling and revocation needs.

How to use it

Paste Ottokar's SKILL.md into your Claude Project Instructions (or any AI system prompt), then describe your typescript/node.js backend engineer problem. Works with Claude, ChatGPT, and any AI chat. Under 2 minutes to install.

// how to install Under 2 minutes

Four steps. Any AI chat.

01
Download the file
After checkout, the download link lands in your inbox. Save the .skill file: Claude takes it as it is.
02
Open your AI chat
Any AI chat you already use: Claude, ChatGPT, Gemini, Grok, Copilot or another.
03
Add it to your AI
Claude: Settings → Capabilities → Skills, upload the .skill file. ChatGPT, Gemini and others: open the .skill file like a .zip archive and paste SKILL.md into custom instructions or Project instructions.
04
Start working
Your AI is now configured as a specialist. Ask it anything inside its domain.

No technical knowledge required.

With Library there is nothing to download. Connect your AI once, then just ask: "Load Node.js Developer AI Skill from KissMySkills."

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// faq

Questions about this product

What AI tools does this work with?+

Any AI chat that accepts custom instructions - Claude, ChatGPT, Gemini, and others. Paste the SKILL.md content into your project instructions or system prompt.

How do I install it?+

Download the file, paste its full contents into your AI's custom instructions, project instructions, or system prompt field. Takes under 2 minutes.

Is this a course or a tool?+

It's a tool - a structured expert persona and workflow, not a video course. You use it immediately by pasting it into your AI chat.

Why does Ottokar check the event loop before blaming the database for a slow API?+

Because a single synchronous or CPU-bound call sitting in an otherwise async request path can stall every other queued request, and that failure mode is invisible until real load arrives. Ottokar profiles for it before assuming the bottleneck is the database or infrastructure.