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Femi Athonnagbo

@femiathonnagbo

Message

I build secure, scalable Node.js APIs and distributed fintech services that improve performance and reliability.

Nigeria

Message

I've built backend services for Teflonhub Limited, Furex Technologies, and Vadtrans Ltd, delivering secure Node.js APIs, payment integrations, and distributed financial systems. My work has reduced API response times by up to 35% and strengthened authentication with JWT, OAuth2, 2FA, and biometric verification.

I design data layers across PostgreSQL, MySQL, MongoDB, and Redis, and use RabbitMQ and BullMQ to keep microservices and long-running workloads reliable. I also contribute to architecture decisions, code reviews, testing standards, and end-to-end delivery from schema design through CI/CD and observability.

Experience

Work history, roles, and key accomplishments

Current

Backend Developer

Current

Teflonhub Limited

Nov 2024 - Present (1 year 10 months)

Design and maintain backend services in Node.js (Express.js, NestJS), delivering scalable APIs. Integrated third-party payment gateways and built biometric-backed user verification into the authentication layer.

NodeJS ExpressJS NestJS Payment Integration Biometric Verification Authentication Code Review API Design

Backend Developer

Furex Technologies

Aug 2025 - Dec 2025 (4 months)

Designed a microservices architecture for a financial transaction platform with RabbitMQ messaging and Swagger/OpenAPI documentation. Built a hardened authentication stack using JWT, OAuth2, and 2FA.

Microservices RabbitMQ Swagger OpenAPI JWT OAuth 2FA PostgreSQL MySQL Prisma ORM MongoDB Redis Flutterwave Twilio Firebase BullMQ

Backend Developer

Vadtrans Ltd

Feb 2024 - Nov 2024 (9 months)

Built REST APIs in Node.js, Express, and PostgreSQL, increasing server responsiveness by ~25%. Authored validation middleware that cut invalid data entries by 30% and optimized queries to reduce response times by 35%.

NodeJS Express PostgreSQL REST APIs Validation Query Optimization Indexing Unit Testing Debugging

Full-Stack Developer

Smade and Smight Ltd

May 2023 - Feb 2024 (9 months)

Led end-to-end development of a real estate platform on the MERN stack with Next.js, contributing to a 30% lift in monthly sales. Built responsive interfaces with React, Redux, and Context API, cutting client-side load time by 25%.