Open to opportunities

Mahdi Abubakar

@mxhdiqaim

Message

Backend-focused software developer building event-driven systems, high-performance APIs, and reliable data workflows.

Nigeria

Message

What I'm looking for

I’m looking for a backend role where I can design event-driven workflows, harden concurrency with PostgreSQL, and improve performance end to end, collaborating with a team that values data-driven decisions and clean architecture.

I build backend systems that stay reliable under load—turning tightly coupled flows into asynchronous, event-driven workflows with TypeScript, Node.js, BullMQ, and Redis. I also harden concurrency with PostgreSQL transaction-level locking to eliminate race conditions and double-bookings, ensuring data integrity across multi-tenant architectures.

I’ve optimized performance by redesigning reservation flows to reduce API roundtrips and using caching to deliver near-instant responses, while keeping the main event loop unblocked through background workers for confirmations, cancellations, waitlist promotions, and reminders. Earlier work included MERN-stack e-commerce development (performance improvements), flexible pricing/discount engines, and AI-driven frontend features like automated thumbnail generation with Stable Diffusion.

Experience

Work history, roles, and key accomplishments

Current

Backend Developer (Contract)

Current

Tallie Limited

Mar 2026 - Present (4 months)

Architected asynchronous, event-driven workflows to ensure eventual consistency and fault tolerance. Implemented PostgreSQL concurrency controls, optimized reservation flows with Redis caching, and built background workers for high-volume reservation actions and reminders.

TypeScript BullMQ Redis PostgreSQL Transaction Level Locking Concurrency N+1 Query Optimization

Full-stack Developer (Freelancer)

Nexpire s.r.o

May 2023 - Mar 2025 (1 year 10 months)

Developed and maintained an e-commerce system using the MERN stack, optimizing application performance by 30%. Built a dynamic invoicing system with MJML, implemented a pricing/discount engine, migrated the database from MongoDB to PostgreSQL, and integrated third-party APIs for real-time product updates and payment processing.

MongoDB React MERN Stack MJML TypeScript Dynamic Pricing Engine Docker Drizzle Kit PostgreSQL Real Time Updates Payment Processing

Frontend Developer

Tubr.io

Oct 2022 - Sep 2023 (11 months)

Built a user-centric AI tool to support YouTube growth with React and TypeScript. Integrated Stable Diffusion models for automated thumbnail generation and implemented responsive, accessible dynamic user interfaces.

React TypeScript Stable Diffusion Responsive Design Accessibility

Junior Software Developer

Transpara LLC

Jul 2022 - Oct 2022 (3 months)

Contributed to a complex React application by designing and implementing three-level component structures to improve modularity and maintainability. Integrated TypeScript to enforce type safety and reduce runtime errors.

React TypeScript Component Architecture Runtime Error Reduction

Full-stack Developer

L Johnson Atelier

Jul 2021 - Jul 2022 (1 year)

Designed and developed responsive web applications, improving load times by optimizing front-end performance. Built a CMS for a sewing factory using React, SASS, Node.js (Express), and MongoDB, implemented a scalable REST API, and integrated Firebase Authentication and Firestore for secure, real-time data synchronization.

HTML CSS JavaScript React SASS MongoDB REST APIs Firebase Authentication Firestore Responsive Web Applications

Software Developer Intern

DevC Training with Andela

Jul 2019 - Sep 2019 (2 months)

Designed and developed a Geo Search app showing weather reports and locations. Used Google Geolocation and OpenWeather APIs with asynchronous programming and worked with modern web frameworks such as ReactJS.

HTML CSS JavaScript OpenWeather API Asynchronous Programming React