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Samuel Nwankwo

@samuelnwankwo

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I build scalable backend platforms, payments, and multi-tenant APIs with Node.js, Laravel, AWS, and Docker.

Nigeria

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What I'm looking for

I'm looking to build scalable backend products where I can own APIs, payments, cloud infrastructure, and multi-tenant systems while mentoring engineers and improving reliability.

I've built production backend platforms for Sweeftly, Credib, Olotu Square, and Webxiel, spanning e-commerce, fintech, SaaS, healthtech, and education.

At Sweeftly, I migrated an e-commerce API from Express.js to NestJS, integrated delivery and payment partners, and reduced payment discrepancies by about 90%. I deployed autoscaling AWS microservices that maintained 99.9% uptime and built a WhatsApp bot that cut support tickets by roughly 35%.

At Olotu Square, I modernized a legacy PHP monolith into Laravel, built multi-tenant SaaS infrastructure, and reduced tenant onboarding from days to under two hours. I also implemented Docker-based GitHub Actions pipelines for zero-downtime releases and trained 12+ backend developers.

Across my work, I've designed REST and GraphQL APIs, payment workflows, event-driven services, and cloud deployments. My npm authentication SDK has been adopted by 200+ applications, and I enjoy building secure, measurable systems that make products easier to scale.

Experience

Work history, roles, and key accomplishments

Current

Backend Engineer

Current

Olotu Square

May 2024 - Present (2 years 4 months)

Migrated legacy PHP monolith to Laravel, reducing deployment errors by ~50%. Built a multi-tenant SaaS platform with automated provisioning, cutting onboarding from 3 days to under 2 hours.

NodeJS Express Laravel MongoDB MySQL Docker GitHub Actions CI CD Multi tenancy

Backend Engineer

Sweeftly

May 2024 - Aug 2025 (1 year 3 months)

Architected and maintained a production e-commerce API, migrating from Express.js to NestJS. Integrated delivery partners and payment methods, reducing payment discrepancies by ~90%.

NestJS ExpressJS MongoDB AWS Docker Stripe Apple Pay Webhooks WhatsApp API

Frontend Developer

Siliconverse

Oct 2024 - Dec 2024 (2 months)

Built responsive UI components for early-stage startup products.

React UI Components

Laravel Developer

Webxiel

Jan 2024 - Oct 2024 (9 months)

Developed a Laravel microservice for a landlord-to-tenant mobile API. Implemented JWT authentication and optimized database queries, improving endpoint response time by ~40%.

PHP Laravel MySQL JWT REST APIs Webhooks Database Optimization

Software Engineer

iGiet Ltd

Nov 2023 - Sep 2024 (10 months)

Designed and built the Parrot mobile app backend from zero to production in 6 weeks. Delivered a REST+GraphQL hybrid API, reducing client data payload by ~30%.

NodeJS ExpressJS Laravel React GraphQL REST JWT Server Side Rendering

Backend Developer

Credib

Aug 2022 - Feb 2024 (1 year 6 months)

Designed a GraphQL API gateway unifying data access across 5+ microservices. Built order and payment workflows with Paystack split payments and introduced Redis caching, reducing DB query load by ~45%.

NodeJS GraphQL MySQL AWS Docker Redis RabbitMQ Paystack Microservices

Software Developer

Emblic Technologies

Mar 2020 - Jul 2022 (2 years 4 months)

Built OfficePro, an enterprise office management system, and a Hospital Management System. Published MyReminda to Google Play Store, reaching 1,000+ downloads.