Dataford
Top 18
Prep plan
Updated weekly · Last refresh Aug 30

Calamos Investments Software Engineer Interview Questions

The questions to prepare for a Calamos Investments Software Engineer interview. Questions from real interview reports rank first. Updated weekly.

18questions
~3htotal time
Track your progressSign up free to work through all 18 questions and resume where you left off.
Start practicing free →
1
SQL & Data ManipulationStart here. 5 questions + 2 drills · ~64 min
Second Highest Without AggregatesHard
Practice

Find the second highest salary in each department without using aggregate functions.

SubqueriesRankingSelf-JoinsCalamos Investments
Explain ACID for Card TransactionsEasy

Explain ACID properties and why they protect financial transaction data in card and payments systems.

acid propertiesfinancial datadata integrityCalamos Investments
Understanding Database Indexing PurposeMedium

Explain the purpose of using indexes in databases and their impact on query performance.

Calamos Investments
Customer Orders: LEFT vs INNER JOINEasy

Explain how INNER JOIN and LEFT JOIN differ, and when to use each for matched-only versus all-left-row analysis.

JoinsData WranglingGroup ByCalamos Investments
Top Customers by Net SalesMedium
Practice
Practice drill

Compute top 10 customers by net sales using joins and aggregations, ordering by revenue with deterministic tie-breaking.

SubqueriesJoinsData WranglingGain DigitalTCSZest AI
Unify CRM and Google Analytics ViewHard
Practice
Practice drill

Merge CRM orders with GA events via an identity map to build a customer-level view using joins, window functions, and monthly rollups.

SubqueriesJoinsData WranglingArtefact
More SQL & Data Manipulation questions with a free account
2
Coding3 questions · ~27 min
Interface vs Abstract ClassEasy

Explain how interfaces and abstract classes differ in purpose, inheritance model, and implementation sharing.

ArraysStringsCalamos Investments
Abstract Classes vs InterfacesEasy

Compare Java abstract classes and interfaces, including inheritance rules, shared behavior, and when each is the better design choice.

javaabstractionoopCalamos Investments
Parse Structured Data MetricsMedium

Tests your ability to parse data and extract metrics reliably in code.

Data WranglingfunctionsbasicsCalamos Investments

Sign up to see every question

Create a free account to unlock this list and practice real interview questions.

Get my prep plan
3
Behavioral & Leadership10 questions · ~89 min
Resolving Team Conflict Under DeadlineEasy

Tests conflict resolution in a team setting, including communication, ownership, and the ability to preserve execution under pressure.

Conflict ResolutionCommunicationLeadershipCalamos Investments
More Behavioral & Leadership questions with a free account
The finish line: interview-readyComplete all 18 questions plus 2 hands-on drills to finish this plan.