Valon interview questions

Showing 1–8 of 8 results

• Build a staged banking service: ATM cash, statements, transfers, fees, slow transfersMedium

  A staged, roughly two-hour coding exercise to build a banking service: ATM balance, deposits and withdrawals, per-account statements that include failed transactions, instant transfers, external transfers that charge a fee, and slow transfers that hold funds until they arrive. It tests exact money handling, ledger design and extensible code.

  ValonSoftware EngineerSoftware Engineering FundamentalsOnsite
• Design Correct Stateful Services for Irregular Financial EventsMedium

  A systems-design interview about correct stateful processing for sparse records, out-of-order loan events, investor payment allocation, and authenticated APIs. It emphasizes idempotency, ledgers, exact arithmetic, recovery, and auditability.

  ValonBackend EngineerSystem DesignOnsite
• Design a Loan System with Borrower Repayments and Periodic Investor PayoutsMedium

  System design question about a loan system in which borrowers make repayments and the investors who own the loans are paid on a schedule. It tests loan and ownership modeling, repayment allocation, exact ledger accounting, idempotent payout runs, cent-level splitting among investors, and handling of payments reversed after a payout.

  ValonSoftware EngineerSystem DesignOnsite
• Design an In-Memory DatabaseMedium

  This question evaluates a candidate's skills in data modeling, in-memory data structures, index design, and query/filter semantics for a flexible schema-less record store.

  ValonSoftware EngineerCoding & AlgorithmsTechnical Screen
• Implement an In-Memory Query EngineHard

  Design and implement an in-memory query engine capable of ingesting records and executing structured queries with comparison, membership, and logical operators.

  ValonSoftware EngineerCoding & AlgorithmsTechnical Screen
• Implement an in-memory SQL-like tableHard

  This problem tests your ability to design a flexible, in-memory table structure that supports dynamic schema definition, data storage, and basic relational query operations.

  ValonSoftware EngineerCoding & AlgorithmsTechnical Screen
• Loan Ledger: Fee-First Payments and Out-of-Order Event ProcessingMedium

  Implement loan accounting handlers in Python where fees increase the fee balance and payments pay down fees before principal, then build a ledger that accepts payment and fee events out of order. It tests keeping events ordered by accounting sequence, updating later balances without reprocessing the whole history, handling ties and overpayments, and analyzing per-call cost.

  ValonSoftware EngineerSoftware Engineering FundamentalsTechnical Screen
• Subscription Ledger: Credits-First Charges With Backdated EventsMedium

  Implement billing event handlers where credits pay down usage before the subscription fee, then build a ledger that accepts charge and credit events out of chronological order and recomputes only the balances that a backdated event actually invalidates.

  ValonSoftware EngineerSoftware Engineering FundamentalsTechnical Screen