Resume- Ujenyuojo Precious Egwuda

Ujenyuojo Precious Egwuda

Software Engineer (Backend)

LinkedIn - GitHub - Portfolio

SUMMARY

Backend Software Engineer with 4+ years of experience building financial and regulated applications using C#, .NET, and Python. Experienced in core banking workflows, transaction processing, payment integrations, concurrency control, API security, and production troubleshooting.

TECHNICAL SKILLS

Languages: C#, Python, SQL (T-SQL)
Backend:.NET, ASP.NET Core, Entity Framework Core, REST APIs
Databases & Messaging: SQL Server, MongoDB, Redis, RabbitMQ
Security: RBAC, JWT, HMAC, API Rate Limiting
Infrastructure & Tools: Docker, Nginx, Linux (Ubuntu), Git, Azure DevOps
Payment Integrations: NIBSS/NIP, EasyPay, CoralPay, BuyPower

PROFESSIONAL EXPERIENCE

Software Engineer | UbuntuCare (Apr 2026 - Present)

Built Python backend services for partner onboarding, health campaign management, subscriber activation, recurring subscriptions, and deactivation workflows.
Implemented subscription billing and provider payout workflows, including payment collection, payout processing, and asynchronous payment notifications.
Implemented idempotent webhook processing with HMAC validation, request rate limiting, retry handling, and failure recovery for partner payment events.
Implemented JWT-based authorization, partner-scoped access controls, request validation, and endpoint isolation for financial and campaign operations.

Backend Engineer (Contract) | OneWallet Microfinance Bank (Sep 2025 - Mar 2026)

Built a .NET account and entity-mapping service connecting consumer accounts, merchant profiles, and POS terminals under unified parent entities to support merchant and agent operations.
Implemented payment routing across NIP, EasyPay, CoralPay, and BuyPower, including transaction-type routing and provider failover for external payment operations.
Implemented transaction concurrency controls using Redis distributed locks and SQL Server locking to prevent conflicting balance updates and double-spending during concurrent financial operations.
Built transaction-status recovery and reconciliation workflows for POS, EMV QR, and VAS transactions, polling external providers to resolve uncertain transaction states and initiating ledger reversals when transactions were confirmed unsuccessful.
Developed a POS gateway enforcing terminal serial validation, endpoint access restrictions, dynamic QR generation, and bill-payment integrations.
Implemented merchant reward and loyalty functionality covering points accrual, tier progression, and redemption for qualifying transactions.
Diagnosed production issues across transaction workflows, database operations, and backend services, implementing fixes for transaction consistency and failure-handling problems.

Software Engineer | Paysure Technologies Limited (Mar 2024 - Aug 2025)

Core banking application developed for NOUN Microfinance Bank

Developed a core banking application for branch operations, supporting customer onboarding, deposits, withdrawals, transfers, loan disbursements, savings deductions, teller operations, and vault workflows using C# and ASP.NET Core.
Designed and implemented role-based access controls covering bankers, tellers, and other bank staff, with configurable roles and privileges and maker-checker authorization for sensitive operations with session and transaction audit tracking.
Implemented transaction processing and double-entry ledger workflows for branch financial operations, maintaining consistent account balances and transaction records.
Integrated NIBSS payment services and RabbitMQ based asynchronous workflows for interbank transfers, settlement processing, validation, and system notifications.
Implemented transaction validation, reversal, and reconciliation workflows for financial operations requiring correction or recovery after failed or inconsistent processing.

Software Engineer | Cloudware Limited (Jan 2022 - Jan 2024)

Developed backend services for a telecommunications licensing and billing platform operating within a regulated environment.
Implemented approval and billing workflows supporting structured regulatory and operational processes.
Optimized SQL queries and backend data-access paths to improve application performance and reduce processing latency.
Migrated legacy operational data into centralized relational storage, improving consistency and accessibility of historical records.
Diagnosed production defects and implemented backend fixes, system enhancements, and reliability improvements.
Configured Nginx reverse proxy and request routing for deployed backend services.

EDUCATION

Bachelor of Science in Sociology

Second Class Upper Division

Kogi State University - Anyigba