Senior Backend Engineer – Core Banking

Key Responsibilities

• Design, develop, and maintain core banking services covering customers, accounts, savings products, transactions, limits, holds, liens, and double-entry ledger functionality.
• Develop and customise Apache Fineract using its extension points, custom modules, business events, and close-of-business processes without unnecessarily forking the core platform.
• Build secure, scalable, and versioned REST APIs for use across the Bank's digital channels and internal systems.
• Implement reliable transaction processing with strong controls around idempotency, concurrency, data consistency, and error handling.
• Integrate event-driven services using Kafka or similar messaging technologies to support real-time account and transaction events.
• Design and optimise database structures, queries, transactions, and migrations using PostgreSQL or MySQL.

Requirements

• 3+ years of professional backend development experience, with strong experience in Java and Spring Boot.
• Proven hands-on experience with Apache Fineract or Mifos X is highly required.
• Demonstrable experience building, customising, extending, or integrating Fineract-based core banking solutions.
• Strong understanding of core banking, financial systems, payments, wallets, ledgers, or transaction processing.
• Deep understanding of double-entry accounting, financial ledgers, database transactions,
• concurrency, and idempotency.
• Experience designing and developing secure and scalable REST APIs.
• Experience with event-driven architecture and technologies such as Apache Kafka,
• Experience with Docker, CI/CD pipelines, and cloud environments such as AWS is an advantage. Knowledge of Nigerian banking requirements, including NUBAN, BVN, tiered KYC, transaction limits, and relevant CBN requirements, is an advantage.