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 expertise, your APIs lag at 300ms latency vs 10ms, causing 45% user drop-offs and -25% conversions.
Weak scalability downtimes cost 15k€/month in lost revenue.
Competitors on Nest/Express outpace you, dev talents flee to modern techs.
70% backend teams stagnate without framework upgrades, risking failed security audits and GDPR fines.
Lose tech lead: slow APIs = unhappy clients, 30% churn.
Invest 28h for x10 performance, zero vulnerabilities, undisputed leadership.
Dive into Fastify internals, benchmark vs Express for x5 speed gains, implement onRequest/onResponse hooks for auth and metrics, code live exercises on real REST APIs, produce a prototype server with advanced logs, Grafana dashboards, and immediate sensations of raw power.
Master strict validation with integrated Ajv, define complex schemas for POST/PUT, handle custom 400 errors, apply exercises on massive e-commerce payloads, generate auto OpenAPI docs, deploy injection-proof secure routes, boost critical API reliability in a snap.
Create custom Fastify plugins for Redis caching, integrate gRPC inter-services, scale via native clustering and PM2, simulate 10k req/s loads in hands-on workshops, optimize memory and CPU, deliver resilient microservices architecture, master smooth horizontal deployment.
Secure with JWT guards and rate-limiter, test unit/integration via Tap, benchmark Artillery for 99.9% SLA, containerize with Docker/K8s, deploy CI/CD GitHub Actions, finalize capstone certifying project, leave with bulletproof production stack and total confidence.
The Training Fastify Expert - Ultra-Fast and Scalable 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 Training Fastify Expert - Ultra-Fast and Scalable 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 Training Fastify Expert - Ultra-Fast and Scalable 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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Backend DevelopmentIndustry-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.