I'm Denny Mathew — a Senior Java Backend Engineer with 12+ years building scalable systems across banking, insurance & healthcare. Now turning that into courses and free videos on DSA, System Design, Java & Spring Boot.
About Me
I'm a Senior Java Backend Engineer with over 12 years of production experience building enterprise systems across banking, insurance, and healthcare. My core stack: Java, Spring Boot, REST APIs, Microservices, Distributed Systems, SQL, Redis, and Azure.
I hold an M.Sc. in Computer Science from Scaler × Woolf University — covering system design, distributed systems, DB internals, and cloud architecture. I'm Microsoft Azure certified and completed an Advanced AI Engineering programme with IIT Roorkee.
On YouTube (System X Engineering), I publish free, no-nonsense videos on HLD, LLD, DSA, Java, and backend engineering. Courses are coming soon — structured, practical, built from real experience.
YouTube · System X Engineering
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Expertise
Battle-tested skills from 12+ years of enterprise Java backend engineering across critical industries.
Learning Platform
12 years of engineering, distilled into structured courses. Follow on YouTube for launch updates.
Let's Connect
Whether you're hiring, collaborating, or just following the journey — all my channels are here.
Looking for a Senior Java Backend Engineer with deep system design experience? I'm open to remote and Europe-based roles.