It is a common story in the Nigerian tech space. You apply for a software engineering role, and your CV passes the ATS screen easily. You chat with the HR manager, and they love your energy and communication skills. But the moment you enter the second stage—the live technical coding interview—everything falls apart.
Passing Tech Interviews
To pass the technical stage of Nigerian tech interviews, focus on communicating your thought process out loud rather than solving the problem in silence. Recruiters evaluate your problem-solving logic, communication skills, and how you handle edge cases and feedback, not just the final working code.
The Silent Developer: Your Greatest Enemy in Coding Tests
I have interviewed dozens of self-taught developers and computer science graduates in Benin City and Lagos. Many of them are incredibly smart and can write clean code in their sleep. However, they make one fatal mistake during the live technical round: they go completely silent.
When an interviewer at Flutterwave or Monnify gives you a problem to solve, they are not just looking for a working script. If they only wanted the final code, they would have sent you a home assessment instead of booking a live call. They want to see how your brain processes complex requirements and constraints.
If you mute your microphone and type silently for forty minutes, you are failing the test. The interviewer has no idea if you are struggling, copying code from another screen, or simply confused. Talk through your logic, explain your choices, and keep the interviewer engaged.
Memorizing Solutions vs. Understanding Fundamentals
Sapa has made many tech candidates desperate, leading them to look for shortcuts. I see candidates spending weeks memorizing LeetCode questions, hoping the interviewer will ask the exact same question. While practicing is good, cramming is a recipe for disaster.
A seasoned senior engineer can easily spot when you are regurgitating a memorized solution. All they have to do is change one small constraint or ask you to optimize for memory instead of speed. If you do not understand the underlying data structures, you will freeze immediately.
Build a proper LeetCode practice strategy. Instead of trying to memorize five hundred algorithms, focus on mastering the fundamentals by category. Spend one week on arrays and hash maps, another on trees and graphs, another on dynamic programming. Understand when to use each data structure and how to analyze time complexity. When you know the rules, you can solve any custom problem the interviewer throws at you.
And here is the secret most Lagos bootcamp graduates miss: quality over quantity. Solving fifty problems deeply, with proper analysis of each, beats cramming three hundred problems superficially. For every problem you solve, write down the brute force approach first, then optimize. That thought process is exactly what interviewers at Paystack and Flutterwave want to hear.
System Design Basics: The Missing Piece in Nigerian Tech Interviews
Most Nigerian tech candidates focus entirely on algorithms and forget system design—and it costs them senior roles. Companies like MTN, Flutterwave, and Paystack do not just want someone who can reverse a linked list. They want engineers who can think about scale.
You do not need to be a solutions architect to pass a system design interview, but you do need basic competence. Understand the difference between SQL and NoSQL databases and when to use each. Know what caching is and why it matters for a high-traffic fintech app. Be able to explain how you would design a simple payment system that handles thousands of transactions per second.
Here is a practical framework: when asked a system design question, start with requirements gathering. Ask about daily active users, transaction volume, and latency requirements. Then sketch a high-level design with load balancers, application servers, databases, and a cache layer. Finally, discuss trade-offs—why you chose PostgreSQL over MongoDB, or why you would use a message queue for async processing.
Candidates who can walk through this process confidently at companies like OPay or Monnify immediately distinguish themselves from the crowd of algorithm-cramming juniors.
Company-Specific Tech Interview Formats You Must Know
Not all Nigerian tech interviews are the same. Each company has a unique format, and walking in blind is a guaranteed way to fail.
Flutterwave runs a three-stage process. First, an HR screening call to assess cultural fit and communication skills. Second, a take-home coding challenge that tests your ability to build a small, production-quality feature. Third, a live technical interview where they review your take-home submission, ask you to extend it with new requirements, and grill you on system design decisions. They care deeply about code quality, testing, and documentation.
Paystack (now Stripe) focuses heavily on clean, well-tested code. Their technical interview emphasizes object-oriented design and writing tests before implementation. Expect a pair-programming session where the interviewer acts as your teammate. Communication and collaboration are just as important as getting the right answer.
MTN’s fintech division runs panel-style technical interviews. You will face three to four engineers who fire questions at you in rotation. Expect a mix of algorithm questions, database design problems, and scenario-based questions about handling network failures in mobile money transactions. They want engineers who understand the Nigerian telecom landscape.
Monnify and OPay lean heavily on practical coding challenges tied to payment systems. Expect questions about idempotency, handling duplicate transactions, and building fault-tolerant systems. If you have never thought about what happens when a user clicks “Pay” twice, now is the time to learn.
Ignoring the Business Context of Your Code
A common mistake made by junior developers is treating code as an academic exercise. They write beautiful algorithms that look great on a blackboard but are completely impractical in production. In the real world, code must solve business problems and save the company money.
If you are interviewing for a fintech firm like OPay or GTBank, your code cannot just assume a perfect network. You must consider what happens when a transaction fails halfway through, or when a user clicks the pay button twice. Show the interviewer that you understand the challenges of building for the Nigerian market.
Mention how you would handle network latency, database connection drops, and API timeouts. This shows that you are not just a coder who translates requirements into syntax. It proves you are a software engineer who builds robust systems that can handle real-world traffic.
The “I Know It All” Attitude: Handling Feedback
Technical interviews are not just tests of your coding ability; they are also tests of your emotional intelligence. How do you respond when the interviewer points out a bug in your logic? Do you get defensive and argue, or do you listen and adapt?
If you argue with the interviewer or refuse to accept their feedback, you will fail the interview. Nobody wants to work with a colleague who is difficult to collaborate with on a Tuesday afternoon. We want to know that you can receive constructive criticism and work well in a team.
When an interviewer suggests a different approach, treat it as a collaboration. Say something like, “That is an interesting point, let me walk through how that would change the structure.” This shows that you are coachable, collaborative, and ready to learn.
The Technical Interview Success Checklist
To make sure you do not miss any critical steps, follow this checklist during your next live technical coding interview.
| Phase | What to Do | Why It Matters |
|---|---|---|
| Clarification | Ask questions before writing any code. | Ensures you understand the problem requirements. |
| Explanation | Explain your chosen approach before typing. | Gets the interviewer’s buy-in on your logic. |
| Coding | Write clean, readable code with descriptive names. | Shows professionalism and respect for clean code. |
| Testing | Walk through the code with sample inputs manually. | Helps you find syntax errors or logical bugs yourself. |
| Optimization | Discuss how you would improve the code if you had time. | Shows you care about performance and scalability. |
How to Practice for the Next Stage
If you want to stop failing the second stage, you must change how you practice. Do not just sit in front of your computer typing code in silence. Practice explaining your solutions out loud to a friend, or even to a rubber duck on your desk.
Record yourself explaining how an algorithm works. If you sound confused when listening to the recording, the recruiter will be confused too. You must be able to explain complex technical concepts in simple, clear terms.
Simulate real interview conditions. Set a timer for forty-five minutes, open a Google Doc (no IDE autocomplete), and solve a problem you have never seen before. This close approximation of the actual interview environment will prepare your brain for the pressure.
Additionally, build real projects that solve local problems instead of cloning popular apps. Building a custom POS integration or a school fees payment portal teaches you more than any tutorial. When you speak from real experience, your confidence will shine through in the interview. And when that confidence shows, the interviewer stops seeing a nervous candidate and starts seeing a future colleague.