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Location: Lagos
Posted on: 2 July 2026
Employment Type: Full Time
Salary Range: 0 - 0 (Naira)
Deadline: 2 September 2026
Union Bank of Nigeria ("UBN") was established in 1917 and is one of Nigeria’s long-standing and most respected financial institutions, offering a portfolio of banking services to individuals, SMEs, commercial and corporate clients. With a robust geographical network comprising more than 300 service centres and over 950+ ATMs spread across Nigeria, we have remained committed to helping individuals, families and businesses grow for nearly a century.
We are recruiting to fill the position below:
Job Title: Software Developer - Java
Location: Lagos
Job Type: Full time
Requirements
Application Closing Date
Not Specified.
Interested and qualified candidates should apply through: Click here to apply
Learn practical strategies to prepare confidently for your Software Developer - Java interview, improve communication skills, and increase your chances of getting hired by 99%.
👇
The Nigerian banking industry has undergone a remarkable digital transformation over the last decade. Today, customers expect to transfer money instantly, pay bills, manage investments, apply for loans, and access banking services anytime through mobile applications, internet banking, USSD platforms, ATMs, POS terminals, and digital wallets.
Behind these services are highly secure, scalable, and reliable software systems—many of which are built using Java, one of the world's most trusted programming languages for enterprise applications.
As a Software Developer (Java) in a Nigerian bank, you will be responsible for developing, maintaining, and enhancing mission-critical applications that process millions of financial transactions every day. Whether it's developing APIs, integrating payment gateways, building microservices, or supporting core banking applications, your role directly contributes to the bank's operational efficiency, security, and customer satisfaction.
This interview guide provides everything you need to prepare successfully—from Java fundamentals and enterprise frameworks to banking concepts, system design, coding interviews, and behavioral questions.
A Software Developer (Java) designs, develops, tests, deploys, and maintains enterprise software applications that support banking operations.
Typical responsibilities include:
Java remains one of the most preferred languages in banking because it offers:
Many banking systems—including payment gateways, middleware, fraud detection systems, customer portals, and core banking integrations—are built using Java.
A Software Developer (Java) may be responsible for:
Interviewers expect proficiency in:
You should be able to:
Banks also value:
Typical qualifications include:
Useful certifications include:
You must have a strong understanding of:
Interviewers often start with fundamental Java questions before moving to advanced topics.
Master the four pillars:
Protecting internal data by restricting direct access.
Creating new classes from existing ones.
Allowing one interface with multiple implementations.
Hiding implementation details while exposing necessary functionality.
Common interview questions:
Understand:
Know when each collection should be used.
Review:
Banks expect applications to handle errors gracefully without compromising data integrity.
Important topics include:
Concurrency is especially important in transaction processing systems where multiple operations occur simultaneously.
Understand:
Interviewers may ask how Java manages memory automatically and how memory leaks can still occur through improper object references.
Know the differences:
Most enterprise banking applications use Spring.
Study:
Spring Boot simplifies enterprise development.
Know:
Review:
Banks increasingly expose secure APIs for mobile apps, partner integrations, and fintech services.
Many Nigerian banks are modernizing legacy applications using microservices.
Understand:
Review SQL thoroughly.
Topics include:
Popular databases include:
Understand:
Banks frequently use asynchronous messaging.
Review:
These technologies help process transactions reliably and improve scalability.
Security is critical.
Study:
Modern banking development emphasizes automation.
Know:
Many banks are adopting hybrid cloud strategies.
Understand:
You should understand:
Study the role of:
Understanding these frameworks demonstrates awareness of the compliance environment in which banking software operates.
Understand every stage:
Banks increasingly use Agile.
Review:
You may be asked to design:
Focus on:
Practice:
Coding platforms:
Examples include:
A design pattern where dependencies are provided to an object instead of being created internally, improving modularity and testability.
HashMap is not thread-safe, while ConcurrentHashMap supports concurrent access using internal synchronization mechanisms suitable for multi-threaded environments.
A banking API suddenly becomes slow during peak hours.
Discuss:
A production bug causes duplicate transactions.
Explain:
A critical deployment fails.
Describe:
Prepare for:
Use the STAR Method:
Good questions include:
"I believe I am a strong candidate because I have a solid foundation in Java development, object-oriented programming, Spring Boot, REST APIs, and database development. I understand the importance of building secure, scalable, and reliable applications, especially in the banking industry where system availability and transaction integrity are critical. I enjoy solving complex technical problems, collaborating with cross-functional teams, and continuously improving my skills. I am committed to writing clean, maintainable code and contributing to solutions that deliver excellent customer experiences while meeting business and regulatory requirements."
To maximize your chances of success:
Before your interview, ensure you are comfortable discussing:
The Software Developer (Java) role in the Nigerian banking sector is one of the most exciting and impactful careers in enterprise software engineering. It offers the opportunity to build secure, scalable, and high-performance applications that support millions of customers and enable the country's growing digital economy.
Success in the interview requires more than strong Java programming skills. Employers want candidates who understand enterprise application development, modern software architecture, secure coding practices, database design, cloud technologies, and the operational realities of banking systems. They also value developers who communicate effectively, collaborate well with multidisciplinary teams, and demonstrate a commitment to continuous learning.
Invest time in mastering Java fundamentals, practicing coding challenges, understanding system design principles, and learning how financial systems operate. Combine technical excellence with clear communication and structured problem-solving, and you will significantly improve your chances of securing a Software Developer (Java) role in Nigeria's dynamic banking industry. I wish you every success in your interview and your software engineering career.
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