Java Developer

Aggregate Business Solution Ltd

Engineering & Technology

Role Description

We are seeking a talented and motivated Java Developer with strong experience in Spring Boot to join our development team. The ideal candidate will be responsible for building and maintaining scalable backend services, collaborating with cross-functional teams, and ensuring high-quality code delivery. If you’re passionate about microservices, REST APIs, and cloud-native development, we’d love to meet you..

Coding Challenge

Develop a Spring Boot REST API that generates, validates, and manages NUBAN (Nigeria Uniform Bank Account Number) account numbers, following the CBN (Central Bank of Nigeria) specification.

Your API should allow internal teams or banks to:

• Create a new NUBAN account number
• Retrieve account details
Validate if an account number is correct

Technical Requirements

• Use Java 17+ and Spring Boot
• Use Spring Data JPA for data access
• Apply input validation with Bean Validation annotations (@NotNull, @Size, etc.)
• Return meaningful HTTP status codes
• Implement global exception handling using @ControllerAdvice
Bonus: Add Swagger/OpenAPI documentation

Submission Instruction

Please send the following to [email protected] :

We review submissions on a rolling basis , so early applications are encouraged!

Key Responsibilities:

• Develop, test, and maintain backend services and APIs using Spring Boot and Java (17 or higher).

• Work with relational and/or NoSQL databases such as MySQL

• Implement RESTful services with proper exception handling, security, and documentation (Swagger/OpenAPI).

• Collaborate with frontend developers, QA, and DevOps teams to ensure smooth integration and delivery.

• Participate in design discussions, code reviews, and architectural decisions.

• Write clean, maintainable, and efficient code following best practices.

• Monitor and troubleshoot application performance and production issues.

• Maintain knowledge of emerging technologies and industry trends.
  

Required Skills and Qualifications:

• Hands-on experience with Java and Spring Boot.

• Strong understanding of OOP, design patterns, and microservice architecture.

• Experience with JPA/Hibernate, Spring Data, and Spring Security.

• Proficiency in building REST APIs and working with JSON/XML.

• Familiarity with CI/CD pipelines, Git, and containerization tools like Docker.

• Understanding of Agile/Scrum development methodologies.

• Familiarity With Amazon Web Services i.e AWS Lambda, API Gateway etc
  

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