Headline

Java Full Stack Developer | 3.6+ Experience | Spring Boot |Microservices | Security & Authentication Systems | FreeRADIUS / AAA | Angular | PostgreSQL | Docker | Building Scalable Backend Platforms

About

Full Stack & Backend Java Developer with 3+ years of experience building scalable, secure backend systems and authentication platforms. I specialize in Java, Spring Boot, and Microservices architecture, with deep expertise in AAA systems, FreeRADIUS integrations, and EAP authentication protocols. My work focuses on building high-performance network authentication platforms used in real-world ISP and enterprise environments. Key expertise includes: • Backend Development – Java, Spring Boot, Microservices, REST APIs • Authentication Systems – AAA, RADIUS, EAP-TLS, PEAP, MSCHAPv2 • Security – JWT, OAuth2, RBAC • Databases – PostgreSQL, MySQL, MongoDB • Frontend – Angular, TypeScript • DevOps – Docker, Git, Jenkins, Linux At 24Online Info Technologies, I designed and developed 100+ REST APIs and built AAA authentication systems including session management, bandwidth policies, and NAS integrations. I enjoy solving complex backend challenges, optimizing system performance, and building production-grade platforms. Open to opportunities in: Java Full Stack | Microservices | Distributed Systems | Security Platforms | Network Authentication Systems

Location

Kolkata

AI stack

cursor

github copilot

ollama

openai

Work experience

Full Stack Developer at 24online Info Technologies Private Limited, Sep 2022 - Present · 3 yrs 10 mos

Full Stack Java Developer at 24online Info Technologies Private Limited, Sep 2022 - Present · 3 yrs 10 mos, • Designed and developed 100+ secure REST APIs using Java, Spring Boot, and JPA for a large-scale SaaS platform. • Implemented authentication systems using JWT, OAuth2, and RBAC. • Developed AAA (Authentication, Authorization, Accounting) systems integrated with FreeRADIUS. • Implemented EAP protocols including PEAP, TLS, TTLS, and MSCHAPv2. • Built policy engines for bandwidth control, session management, and NAS integration. • Developed Angular dashboards and admin panels improving UX performance. • Optimized backend performance via Hibernate tuning and SQL optimization. • Automated firewall and bandwidth policies using iptables and Linux scripts. • Integrated payment gateways (Razorpay, BillDesk) with secure backend validation. • Contributed to system architecture, debugging, and production performance improvements.

Education

Deploma of Elementery Education, Elementary Education and Teaching, The University of Burdwan

Bachelor of Science, The University of Burdwan