🏆 Over 100 graduates · Sold out in Singapore, Athens, London
Master algorithms, system design, and engineering thinking in one intensive 4-hour session
4-hour intensive · Limited seats
Apr 27 just sold out. 3 sessions left and filling up fast — lock yours in before it's gone.
📋 Need to convince your boss? Get the business case →
A full-day, hands-on workshop to transform you from code contributor to well-rounded engineering leader.
Five tracks. Eighteen+ concrete topics. Every one comes from real production code.
Architect systems that scale from day one
Shared vocabulary. Reliable code. Fewer fires.
Stop guessing. Start measuring.
Tests that catch bugs without slowing you down.
Ship secure UI. Dodge the AI traps.
Plus more — Accessibility, AI workflows, and Algorithms as time allows.
Lock in my spot → Not for beginners.
Ready to level up?
Yes, count me in →4-hour intensive · Morning or evening CET
⏰ Limited seats · April 27 · April 28, 30 · May 2 — Apr 27 sold out. Once a session fills, that's it.
Everything else included with your seat — no upsells.
Every line of code we write together, yours to keep and revisit.
The complete deck for every module — perfect reference material.
A standing discount on anything I teach next.
📋 NEED TO CONVINCE YOUR BOSS?
Pick the curriculum topics you care about, fill in your details, and we generate a tailored email — ready to send to your manager.
Open the pitch builder → "Before this workshop, system design interviews were a black box for me. Dan walked us through designing a WhatsApp-scale messaging system step by step — from choosing between polling and WebSockets, to sharding strategies, to handling eventual consistency. I used exactly that framework in my interview at a FAANG company two weeks later and got the offer. The way he breaks down trade-offs between approaches made everything click."
"I've been a frontend developer for 4 years and never felt confident discussing architecture beyond my React components. The system design module changed that completely. We designed a real-time notification system, debated CAP theorem trade-offs, and Dan pushed us to defend our decisions out loud. That practice of articulating technical reasoning was the most valuable part. I also didn't expect the security section to be so hands-on — we actually exploited XSS vulnerabilities live."
"What sets this apart from online courses is that Dan doesn't just teach — he challenges you to think. During the system design exercises, he'd throw curveballs: 'What happens when this service goes down?' or 'Your database just hit 10TB, now what?' That pressure to think on your feet is exactly what interviews feel like, and you can't get that from a YouTube video. I walked out feeling like I'd leveled up from mid to senior in how I reason about systems."
Dan Neciu
Staff Engineer · Tech Co-Founder · International Speaker
Dan has spent 12+ years shipping production systems at scale — from Glovo's delivery platform serving millions of orders, to AdoreMe's e-commerce frontend, to building CareerOS from the ground up as technical co-founder and staff engineer. He improved Glovo's Web Core Vitals from 50% to 90% green, architected CI/CD pipelines for 4 frontend applications, and led the integration of Sales, Product, and Engineering at CareerOS.
Helping engineers level up from mid to senior and beyond
Built products at