Optum - interview guide

Optum interview questions - a complete guide

Optum is a healthcare technology company - so alongside coding, it looks at your understanding of health data privacy and responsibility.

Language:EnglishHinglish

About Optum

Optum is part of UnitedHealth Group and provides technology, data and services for healthcare - such as processing insurance claims, hospital systems and pharmacy services. It has large centres in Hyderabad, Gurugram, Noida and Bengaluru.

This guide covers 13 Optum interview questions with answers - what each question checks and how to answer it - plus the Optum interview process, round by round, a 7-day preparation plan for freshers, tips and the mistakes to avoid.

Optum hiring process

  1. AI screening / online test

    Reported: an AI-based screening or an online assessment.

  2. Technical rounds (1-2)

    Fundamentals, projects, OOP and SQL.

  3. Behavioural / HR

    Values, teamwork and fit.

Optum does not publish its India fresher interview process in detail (as of our check). This is based on candidate reports - many of them for experienced roles, so the fresher process can differ. Confirm with the recruiter.

Sources (checked 16 October 2026): UnitedHealth Group Careers. Hiring processes change - read the official notice before you apply.

Optum interview questions and answers

Technical

  1. 1.What is the difference between checked and unchecked exceptions in Java (with examples)?

    What they're checking
    Java basics - Optum does a lot of Java work.
    How to answer
    Checked ones must be handled/declared at compile time (IOException). Unchecked ones come from RuntimeException (NullPointerException) - usually a bug in the code.

  2. 2.What is dependency injection in Spring Boot?

    What they're checking
    Backend framework.
    How to answer
    A class doesn't create its own dependencies - Spring passes them in through the constructor. Testing gets easy (you can pass a mock) and the code is loosely coupled.

  3. 3.How would you test a service with JUnit and Mockito?

    What they're checking
    Testing.
    How to answer
    Mock the repository with Mockito, set its answer (when...thenReturn), call the service method, and assert + verify that the repository was called correctly.

  4. 4.Design Patient, Doctor and Appointment classes.

    What they're checking
    OOP.
    How to answer
    Patient (id, name), Doctor (id, speciality, slots), Appointment (patient, doctor, time, status). Booking in an AppointmentService that checks the slot is free.

  5. 5.How do you stop two appointments being booked in the same slot for one doctor?

    What they're checking
    Concurrency in healthcare booking.
    How to answer
    A unique constraint on (doctor_id, slot_time) in the database - the second insert fails. Plus a transaction and a clear message to the user.

  6. 6.Merge two sorted lists of patient IDs, removing duplicates.

    What they're checking
    Basic coding.
    How to answer
    Two pointers; take the smaller, and skip it if it equals the result's last element. O(m + n).

SQL and healthcare data

  1. 7.SQL: get the details of each patient's most recent visit.

    What they're checking
    Window functions.
    How to answer
    The rows where ROW_NUMBER() OVER (PARTITION BY patient_id ORDER BY visit_date DESC) = 1. Or join to a subquery with MAX(visit_date).

  2. 8.How would you catch duplicate insurance claims?

    What they're checking
    A domain problem.
    How to answer
    Group by the same patient, provider, service code and nearby dates, and flag groups with more than one. Check both exact and 'almost the same'.

  3. 9.Why is health data privacy extra important, and how do you protect it in code?

    What they're checking
    Healthcare responsibility.
    How to answer
    Leaking someone's illness can harm them. The US has laws such as HIPAA. Collect minimal data, encrypt, control access, and keep personal data out of logs.

  4. 10.Write a function that shows only the last 4 digits of a phone number.

    What they're checking
    Data masking.
    How to answer
    Replace the other digits with 'X': XXXXXX1234. Handle null or short numbers safely. Mask on the server, not just on screen.

Behavioural

  1. 11.How would you answer an AI or recorded screening interview?

    What they're checking
    AI screening has been reported.
    How to answer
    Look at the camera, keep the light and sound good, each answer 1-2 minutes in STAR, and don't read a script.

  2. 12.Tell me about a time you made a mistake - how did you report and fix it?

    What they're checking
    Integrity.
    How to answer
    You didn't hide it - when you raised it, what you fixed, and what you changed so it doesn't happen again.

  3. 13.Why Optum/UnitedHealth Group?

    What they're checking
    Motivation.
    How to answer
    The idea of helping people through technology in healthcare - a personal or project-related reason.

7-day preparation plan for the Optum interview

  1. Day 1: Core Java - exceptions, collections, OOP.
  2. Day 2: Spring Boot basics and testing (JUnit, Mockito).
  3. Day 3: SQL - joins, window functions.
  4. Day 4: Easy-medium DSA - five problems.
  5. Day 5: The healthcare domain - claims, privacy, masking.
  6. Day 6: Recorded answer practice + behavioural.
  7. Day 7: A mock technical round.

Preparation tips

  • Nail the basics of Java, Spring Boot and SQL.
  • Understand a couple of points about healthcare data privacy.
  • Practise on camera for AI/recorded screening.
  • Be ready to explain how you used OOP in your projects.

Mistakes to avoid

  • Taking privacy lightly at a healthcare company.
  • Listing Spring on your resume without understanding DI.
  • Reading a script in recorded screening.

Frequently asked questions

How many rounds are there in the Optum interview?

According to reports, a screening/online test, 1-2 technical rounds and one behavioural/HR round.

Which technology matters at Optum?

Java and Spring work is reported most, along with SQL.

Where does Optum hire in India?

Large centres are reported in Hyderabad, Gurugram, Noida and Bengaluru.

How are Optum and UnitedHealth Group related?

Optum is part of UnitedHealth Group - its careers are on the UnitedHealth Group site too.

Similar companies - Product and internet companies

More company guides

Read next

On a live call, Cuelyte AI hears questions like these and has an answer ready in about a second, built from your resume and notes. Campus placements: how Cuelyte AI helps

Ready for your Optum interview?

Practise these questions with Cuelyte AI: add your resume, type a question and get a clear answer in your own words - in English, Hindi or Hinglish. Free to start.

Start free - no card neededSee pricing