James Okonkwo

About James

I'm a backend engineer with 8 years of experience building data-intensive applications with Python. I specialize in API design, database optimization, and building reliable backend services that power complex products. My experience spans fintech, e-commerce, and SaaS, and I'm passionate about writing clean, well-tested code that scales gracefully.

Top Achievements

• Designed reconciliation system handling $2B+ in annual transactions
• Built GraphQL APIs serving 300K+ businesses
• Optimized queries reducing page load times by 55%

Tech Stack

PythonPostgreSQLDockerGraphQLAWS

Work History

Senior Backend Engineer at Paystack (Stripe)

May 2022 – Present

Building payment processing APIs for merchants across Africa. Designed the reconciliation system handling $2B+ in annual transactions.

PythonPostgreSQLDockerAWS

Backend Developer at Flutterwave

Jan 2020 – Apr 2022

Developed the merchant onboarding and KYC verification pipeline. Built GraphQL APIs for the merchant dashboard serving 300K+ businesses.

PythonGraphQLPostgreSQLDocker

Software Engineer at Konga (E-commerce)

Mar 2017 – Dec 2019

Built the product catalog and search backend for Nigeria's largest e-commerce platform. Optimized database queries reducing page load times by 55%.

PythonPostgreSQLAWS

Education & Awards