Rigorous trainer selection
Each trainer is validated on three criteria: hands-on field expertise, proven pedagogy and alignment with your industry.
- Triple validation: technical, pedagogical, sectoral.
- Minimum rating 4.8/5 over the last 12 sessions.
Describe your need, get a tailored program and a pre-filled quote in 3 min. A 100% free call with an advisor.

To fight inequalities in access to education, Learni donates a complete school kit to a child in need for every training booked. You build your skills, a child heads back to school.
Founded by engineers and learning experts, Learni's mission is to make high-impact tech training accessible to teams everywhere. We work remotely with organizations across the US and Canada, in your time zone, to help teams upskill fast.
Don't let this gap widen
Without Fastify, your Node.js APIs top out at 10k req/s, vs 100k+ with Fastify (official benchmarks).
Risk +300% response time under load, downtimes at 15k€/h (Gartner), teams stuck on slow Express, 50% inflated infra costs.
Clients flee to scalable competitors.
28h investment = x10 perf, -40% hosting, immediate ROI on critical projects.
Don't let your APIs sink your business.
Dive into configuring an ultra-fast Fastify server, explore dynamic routes and pre/post-handlers, complete exercises on custom serialization and structured logging, produce a complete API scaffold with basic validation, boost your productivity from day one.
Create reusable plugins to modularize your app, implement onRequest and onResponse hooks for logging and metrics, practice on real-world cases like rate limiting, generate testable deliverables with Tap.js, transform your APIs into scalable and maintainable architectures.
Secure your endpoints with JWT and @fastify/jwt, validate payloads via advanced JSON Schema, integrate OAuth2 middleware, simulate attacks and defenses in hands-on exercises, deploy a complete auth module, protect your APIs from costly breaches right away.
Optimize with HTTP/2 streaming and Redis caching, benchmark x10 gains in req/s, deploy in PM2 clusters and Docker, set up Prometheus/Grafana monitoring, finalize a full-stack scalable API project, leave with production-ready expertise to dominate your backend challenges.
The Fastify Training - Ultra-High-Performance and Scalable Node.js APIs program is delivered onsite or remote (blended-learning, virtual classroom, remote presence). At Learni, an industry-certified training organization, every program is built to maximize skills acquisition regardless of the chosen format.
The trainer alternates between demonstrative, interrogative and active methods (through hands-on labs and/or scenarios). This pedagogical approach guarantees concrete learning that's immediately applicable at work.
For the smooth delivery of the Fastify Training - Ultra-High-Performance and Scalable Node.js APIs program, the following equipment is required:
For intra-company training on a site outside Learni, the client commits to providing all required teaching materials (computers, internet, etc.) for the smooth delivery of the program in line with the prerequisites in the communicated program.
Assessment of skills acquired during the Fastify Training - Ultra-High-Performance and Scalable Node.js APIs program is performed through:
Learni is committed to making its programs accessible. All our programs are accessible to people with disabilities. Our teams are available to adapt the pedagogical methods to your specific needs. Please contact us for any adjustment request.
Registration is possible up to 48 business hours before the start of training. All our programs are built for corporate L&D budgets and delivered onsite or remotely.
Before, during, after: we frame the brief, introduce the trainer, tailor the content and measure impact. You stay in control from kickoff to wrap-up.
Each trainer is validated on three criteria: hands-on field expertise, proven pedagogy and alignment with your industry.
30-minute video call between you and the selected trainer to validate the fit, adjust content and clear any final doubts.
No recycled slides. The syllabus is reworked from your real cases: tools, constraints, vocabulary, ongoing projects.
Live evaluations, 30/90/180-day check-ins and a consolidation plan. If the impact misses the mark, we rework it.
A simple promise: you don't pay to discover the trainer on day one. Everything is validated upfront, by you.
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ManagementIndustry-certifiedAvailable on-site and remotely. Pick your city to see the local training center.
30 minutes with a learning advisor. No commitment. No sales pitch dressed up as a demo.