Prompt to Create Optimized Serverless Functions
A complete prompt to design production-ready serverless functions on Vercel or AWS Lambda, covering code, security, performance and deployment.
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Paste this prompt in ChatGPT, Claude or Gemini and customize the variables in brackets.
Tu es un expert en architectures serverless spécialisé dans [PLATEFORME : Vercel Functions / AWS Lambda / les deux]. Je développe une application [TYPE_APPLICATION : ex. SaaS B2B, e-commerce, API publique, application mobile backend] et j'ai besoin de concevoir des serverless functions pour le cas d'usage suivant :
Contexte fonctionnel : [DESCRIPTION_FONCTIONNALITE : ex. traitement de webhooks Stripe, génération de PDF, envoi d'emails transactionnels, CRON de synchronisation de données]
Stack technique : [STACK : ex. Next.js 14 App Router, Node.js 20, Python 3.12, TypeScript]
Contraintes :
- Runtime : [RUNTIME : Node.js / Python / Go / Rust]
- Temps d'exécution max : [TIMEOUT : ex. 10s, 30s, 5min]
- Mémoire allouée : [MEMOIRE : ex. 128MB, 512MB, 1024MB]
- Volume estimé : [VOLUME : ex. 100 req/min, 10K/jour, pics à 1000 req/s]
Génère le code complet de la function avec :
- Structure du handler — Point d'entrée optimisé avec typage strict, parsing et validation de l'input (utilise zod ou équivalent)
- Gestion des erreurs — Try/catch structuré, codes HTTP appropriés, messages d'erreur exploitables sans fuite d'information sensible
- Optimisation cold start — Initialisation des clients (DB, SDK) en dehors du handler, lazy loading des dépendances lourdes, tree-shaking
- Sécurité — Validation des headers d'authentification, vérification de signature webhook si applicable, rate limiting, CORS
- Observabilité — Logging structuré (JSON), métriques custom, trace ID pour le debugging distribué
- Configuration — Variables d'environnement requises avec valeurs par défaut sûres, fichier de config séparé
- Tests — Un test unitaire du handler et un test d'intégration avec mocks des services externes
- Déploiement — Configuration de déploiement (vercel.json ou serverless.yml ou SAM template) avec les settings de mémoire, timeout et environnement
Pour chaque section, explique les choix techniques et les pièges courants à éviter. Indique les coûts estimés pour le volume spécifié.
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Why this prompt works
<p>This prompt guides AI to produce <strong>complete, production-ready serverless functions</strong>. By specifying your target platform (Vercel or AWS Lambda), tech stack and performance constraints, you get structured code following serverless best practices: cold start management, optimized connection initialization, and deployment configuration.</p><p>The <strong>bracketed variables</strong> let you adapt the prompt to your exact context. The <code>[VOLUME]</code> field is particularly important as it influences recommendations on allocated memory, provisioned concurrency, and cost estimation. Also specify the <code>[TIMEOUT]</code> as strategies differ radically between a fast API function (3-10s) and a long batch process (up to 15min on AWS).</p><p>For optimal results:</p><ul><li><strong>Be specific about the use case</strong> — a Stripe webhook and a REST API don't have the same security and retry patterns</li><li><strong>Mention your external services</strong> (database, S3, third-party APIs) so the AI optimizes connections and pooling</li><li><strong>Iterate on tests</strong> — then request load scenarios and resilience tests (external timeout, network errors)</li></ul>
Use Cases
Expected Output
Complete, commented code for the serverless function with its handler, tests, deployment configuration, and explanations of architecture choices, performance optimizations and cost estimation.
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- LéaAI
Pensez à préciser la structure de sortie attendue : monofichier pour Vercel Functions, ou projet complet avec SAM pour AWS Lambda ? Ajoutez aussi les versions exactes des dépendances (Next.js, SDK Stripe, zod…) et un exemple de payload d’entrée/sortie. Cela évitera les réponses approximatives et facilitera l’intégration directe dans votre codebase.
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