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Nium Interview Preparation

Medium-Hard

Technology · India

We’re driving the future of payments in a world where traditional finance is disrupted, and on-demand is the new norm. Our cutting-edge payments infrastructure empowers anyone, anywhere to make and receive payments instantly, no matter the location or currency. Prajit Nanu, Founder & Chief Executive Officer at Nium, grew up in the bustling streets of Mumbai with a very serious case of the “entrepreneurial bug.” To be a true business architect takes gumption, and let’s just say that our Founder has gumption in abundance. Whilst on holiday in Thailand, Prajit realized how difficult it was to transfer money internationally. It got him thinking. Like, seriously thinking. Freshly out of ”holiday mode” and barely able to contain his excitement – Prajit started his very first company - Instarem. Focusing initially on servicing consumer-led transfers, but it was not long before Prajit built a team to move money for businesses too. In 2014, with blood, sweat, tears and a passion for payments – Nium was born. Today, our extensive network, diverse range of licenses, and powerful APIs work together seamlessly to accelerate our customers’ businesses growth both locally and internationally. We have over 750 team members globally and over 10 offices (and counting) worldwide. Approved as a Registered Financial Service Provider in New Zealand Became First Global Fintech to Secure Type 1 Funds Transfer License from Japan's Financial Service Agency Named to the Forbes Fintech 50 List for Second Year in a Row Announced Great Place To Work Certified™ in India, Malta, Singapore and the United States Acquired Ixaris , the world’s 3rd-largest B2B travel card issuer FSTP License approval in Japan; Remittance license approval in Indonesia MSB License approved in Hong Kong, Singapore and part of the US Our payments infrastructure is optimized for fast-growing businesses, replacing legacy systems with next-generation infrastructure delivering real-time processing, data-rich messaging, and standards interoperability to make it easier for them to move money around the world. We support businesses with the most currencies and channels—including wallets, accounts, cards, and more—with the broadest reach to ensure that money can move seamlessly to anyone, anywhere. We prioritize optionality, giving our customers and the market at large what it needs today and tomorrow. We enable real-time money movement to more than 100 countries—shorter settlement windows, immediate funds receipt, most efficiency. We support new money movement requirements for gig workers, creators, and businesses that

280+ questions4 rounds5 expert tipshttps://www.nium.com

About Nium

We’re driving the future of payments in a world where traditional finance is disrupted, and on-demand is the new norm. Our cutting-edge payments infrastructure empowers anyone, anywhere to make and receive payments instantly, no matter the location or currency. Prajit Nanu, Founder & Chief Executive Officer at Nium, grew up in the bustling streets of Mumbai with a very serious case of the “entrepreneurial bug.” To be a true business architect takes gumption, and let’s just say that our Founder has gumption in abundance. Whilst on holiday in Thailand, Prajit realized how difficult it was to transfer money internationally. It got him thinking. Like, seriously thinking. Freshly out of ”holiday mode” and barely able to contain his excitement – Prajit started his very first company - Instarem. Focusing initially on servicing consumer-led transfers, but it was not long before Prajit built a team to move money for businesses too. In 2014, with blood, sweat, tears and a passion for payments – Nium was born. Today, our extensive network, diverse range of licenses, and powerful APIs work together seamlessly to accelerate our customers’ businesses growth both locally and internationally. We have over 750 team members globally and over 10 offices (and counting) worldwide. Approved as a Registered Financial Service Provider in New Zealand Became First Global Fintech to Secure Type 1 Funds Transfer License from Japan's Financial Service Agency Named to the Forbes Fintech 50 List for Second Year in a Row Announced Great Place To Work Certified™ in India, Malta, Singapore and the United States Acquired Ixaris , the world’s 3rd-largest B2B travel card issuer FSTP License approval in Japan; Remittance license approval in Indonesia MSB License approved in Hong Kong, Singapore and part of the US Our payments infrastructure is optimized for fast-growing businesses, replacing legacy systems with next-generation infrastructure delivering real-time processing, data-rich messaging, and standards interoperability to make it easier for them to move money around the world. We support businesses with the most currencies and channels—including wallets, accounts, cards, and more—with the broadest reach to ensure that money can move seamlessly to anyone, anywhere. We prioritize optionality, giving our customers and the market at large what it needs today and tomorrow. We enable real-time money movement to more than 100 countries—shorter settlement windows, immediate funds receipt, most efficiency. We support new money movement requirements for gig workers, creators, and businesses that

Interview Rounds4

1
Online Assessment60–90 min

2–3 DSA coding problems on HackerRank, CodeSignal, or company platform

2
Technical Interview I45–60 min

Data structures & algorithms — arrays, trees, graphs, dynamic programming

3
Technical Interview II45–60 min

System design or low-level design — scalability, APIs, databases

4
HR / Culture Round30 min

Career goals, teamwork, strengths/weaknesses, role expectations

Practice Questions10

Key Topics

  • Data Structures & Algorithms150q
  • System Design50q
  • Object-Oriented Design40q
  • SQL & Databases25q
  • CS Fundamentals (OS, Networking)25q

Expert Tips

  • Practice LeetCode easy and medium problems before the OA — focus on arrays, strings, trees, and graphs.
  • For system design, use the RESHADED framework: Requirements, Estimation, Storage, High-level design, APIs, Detailed design, Evaluation.
  • Prepare 3–4 STAR stories covering: a challenge you solved, a time you worked in a team, a project you owned end-to-end.
  • After every coding solution, proactively state the time and space complexity — interviewers expect it.
  • Study common CS fundamentals: process vs thread, TCP vs UDP, REST vs GraphQL, SQL indexing, CAP theorem.