Back-End Developer Intern (Java Spring Boot & PostgreSQL Microservices)

About Technum Opus & Onified.ai

Technum Opus Pvt Ltd builds Onified.ai a scalable, multi-tenant enterprise suite for manufacturing. We build real microservices with strong backend fundamentals: clean APIs, reliable data models, auditability, and performance discipline.

Who this is for

This internship is demanding. You will work on real backend modules, code reviews, and delivery.

We want candidates with fundamentals + ownership, not just tutorial exposure.

What you'll work on-

Build microservices using Java Spring Boot

Implement REST APIs with proper validation + error handling

• Work with PostgreSQL (schema design, queries, indexing basics)
• Write clean code, follow layered architecture, participate in reviews
• Support production-grade patterns (logging, audit fields, idempotency basics)

Non-negotiables

• On-site Gurgaon
• Strong Java fundamentals + ability to learn fast
• Can explain what you built (ownership clarity)

How to Apply

Comment Java Intern Gurgaon and DM:

• Resume + LinkedIn
• GitHub / project links (mandatory if you have them)
• Current location + earliest joining date
• Answers to screening questions - attach with resume or copy and paste in DMs

Q1) Current location (mandatory): City + State

Q2) On-site commitment: Can you work from Gurgaon office full-time for 26 months (Yes/No)

Q3) Project proof (mandatory):

Share one Spring Boot project link (GitHub or Drive). If you don't have Spring Boot, share your best Java backend-style project.

In 810 lines, explain: what it does, architecture (controllers/services/repos), and what you personally owned.

Q4) Debugging depth test (mandatory):

You deploy an API and it becomes slow after data grows. List 8 steps you will take to diagnose (include app logs, DB query analysis, indexing, profiling, and API payload checks).

Q5) Database thinking test (mandatory):

You have a table orders with 10 million rows. Common query:

SELECT * FROM orders WHERE tenant_id= AND status= ORDER BY created_at DESC LIMIT 50;

What indexes would you create and why (Write the index definitions in plain text.)

Q6) Clean API thinking (mandatory):

Design a REST API for Create Ticket with validation.

Provide: endpoint, request JSON, 5 validations, and 3 possible error responses with HTTP codes.