Java Backend Developer · Senior Executive @ IDBI Intech · Thane, India
Building secure & scalable microservices with strong foundations in performance and security.
Java Backend Developer with 4+ years designing, developing and maintaining scalable backend applications and microservices using Java and Spring Boot. I work on secure, high-availability enterprise systems — improving application performance through microservices architecture and Spring Cloud Gateway, and strengthening security via AES encryption, LDAP, and JWT-based authentication and authorization. Comfortable across Docker, CI/CD pipelines and cross-functional Agile delivery.
Note
Most of my engineering work lives in private enterprise repositories. The public repos on this profile are a learning and experimentation space — clones, course code and side projects, mostly in JavaScript and Python. They are not representative of what I do professionally. The sections below describe the enterprise work at a level I can share publicly.
Enterprise backend platforms — described at a professional level only. No client data, credentials, endpoints, schemas or proprietary code.
| Where | Role | Period | What I build |
|---|---|---|---|
| IDBI Intech | Senior Executive | Oct 2024 – Present | A secure microservices platform built from scratch: React.js frontend with LDAP login, Spring Cloud Gateway for centralised auth and call filtering, Eureka service discovery, and end-to-end AES-encrypted communication across 7+ Spring Boot services. |
| Nexstep Infotech (Expenzing) | Software Engineer | Jan 2022 – Aug 2024 | Procure-to-Pay and Travel & Expense mobile applications — multi-attachment support, OCR on invoices and expense vouchers, map functionality, UI/UX upgrades, plus VAPT remediation across the stack. |
| Tritorc | IT Technical Engineer | May 2021 – Sept 2021 | Network and desktop infrastructure across Windows Server and Linux — Active Directory, DNS, DHCP, TCP/IP and VPN for 30+ systems. |
| 70% application performance improvement | 40% enterprise security compliance increase | 30% code efficiency improvement |
| 7+ microservices architected & deployed | 20% reduction in repetitive coding effort | 15% reduction in system downtime |
The secure microservices platform I built at IDBI Intech, at a shareable level:
flowchart TD
C["React.js client<br/>LDAP login · AES-encrypted payloads"]
G["Spring Cloud Gateway Server<br/>centralised auth · call filtering"]
L["LDAP directory<br/>enterprise authentication"]
E["Eureka Server<br/>discovery · load balancing"]
S1["Microservice<br/>Spring Boot · Java 17"]
S2["Microservice<br/>Spring Boot · Java 17"]
S3["Microservice<br/>7+ services deployed"]
D[("MySQL / Oracle<br/>Hibernate · token store")]
C -->|"AES / HTTPS"| G
G <--> L
G <--> E
G -->|"JWT + DB token"| S1
G -->|"JWT + DB token"| S2
G -->|"JWT + DB token"| S3
S1 --> D
S2 --> D
S3 --> D
How the security layers fit together
| Layer | Mechanism |
|---|---|
| Client → Gateway | AES encryption with PKCS7 padding on request and response bodies |
| Authentication | LDAP directory login, handled centrally at the gateway |
| Gateway → Services | Multi-level JWT plus database-driven token authentication |
| Service → Service | End-to-end AES-encrypted data exchange |
| Discovery | Eureka for service registration, discovery and load balancing |
| Delivery | Docker images deployed through CI/CD pipelines |
Earlier, at Expenzing, I worked through VAPT findings on the mobile stack — SSL pinning, encrypted body transmission, session handling, single-response services, multiple-login prevention, broken authentication prevention and rooted-device blocking.
Languages & core
Frameworks
Security
Data & servers
DevOps & tooling
Happy to collaborate on software development and Spring Boot projects, and always glad to talk through software engineering and application security fundamentals.
| Certification | Issuer | Date |
|---|---|---|
| Master Microservices with Spring Boot, Docker, Kubernetes | Udemy | Jun 2024 |
| Complete React Developer (Redux, Hooks, GraphQL) | Udemy | Nov 2023 |
| Java Design Patterns & SOLID Design Principles | Udemy | Oct 2023 |
| Multiplatform Mobile App Development With React Native | Coursera | Aug 2023 |
- Award — Going Beyond Call of Duty, issued by the CEO, Expenzing (2023)
- Education — Bachelor of Computer Science, Bharati Vidyapeeth College of Engineering (2016 – 2020)
Tip
The contribution graph on this profile includes private contributions, so it reflects the enterprise work described above rather than only the public repositories.
Portfolio · LinkedIn · Stack Overflow · Quora · onkarpawar58@gmail.com