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.
1 seat held for the next session
Request a call back and an advisor reaches you within 24 business hours, Monday to Saturday.

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 this training, your Java apps stagnate: JVM performance degraded by 30-50% under high loads, invisible bugs with legacy code costing 20h/week in debugging, lag on Java 21 exposing to security vulnerabilities (recent CVEs), unstable microservices generating 15% downtime, lost competitiveness against trained teams (salaries +25% for certified experts).
Invest 7h to avoid annual losses of 50k€ in inefficient production and urgent maintenance.
Dive into Java 21 to code ultra-efficient Virtual Threads, test them on massive concurrency exercises, profile your JVM with VisualVM and Mission Control to gain 40% performance, implement records and pattern matching on real client cases, build a resilient microservice with Reactor and Docker, deliver an optimized project ready for production, leave boosted and ready to scale your apps.
The Training Java Expert - Optimize Your Apps for Maximum Performance 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 Java Expert - Optimize Your Apps for Maximum Performance 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 Java Expert - Optimize Your Apps for Maximum Performance 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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JavaScript & TypeScriptIndustry-certified
Java & JVM ecosystemIndustry-certified
Java & JVM ecosystemIndustry-certified
Java & JVM ecosystemIndustry-certified
Java & JVM ecosystemIndustry-certified
Java & JVM ecosystemIndustry-certified
Java & JVM ecosystemIndustry-certified
.NET & C#Industry-certified
.NET & C#Industry-certified
.NET & C#Industry-certified
.NET & C#Industry-certified
.NET & C#Industry-certified
.NET & C#Industry-certified
Linux administrationIndustry-certified
Linux administrationIndustry-certified
Linux administrationIndustry-certified
Linux administrationIndustry-certified
Linux administrationIndustry-certified
Linux administrationIndustry-certified
JavaScript & TypeScriptIndustry-certified
JavaScript & TypeScriptIndustry-certified
JavaScript & TypeScriptIndustry-certified
JavaScript & TypeScriptIndustry-certified
JavaScript & TypeScriptIndustry-certified
JavaScript & TypeScriptIndustry-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.