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James Donkor

@jamesdonkor

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Backend Engineer at Sesi Technologies who built concurrency-safe Django APIs for agricultural platforms and e-commerce.

Ghana

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What I'm looking for

I'm looking for a remote backend role where I can build and secure production Django APIs and work on reliable data workflows.

At Sesi Technologies, I designed a device-provisioning API with confirmation and rollback flows, using PostgreSQL row-level locking to prevent duplicate serial-number allocation.

I implemented multi-tenancy and role-based access control for the CocoaGuard cocoa-quality app, and developed agricultural marketplace APIs for product discovery, payments, stock validation, and delivery pricing.

I also strengthened security across multi-tenant endpoints and built GrainMate sensor-data flows with threshold alerts and token authentication for remote hardware.

On my OneStopShop API project, I built a Django e-commerce API with concurrency-safe checkout and idempotent Paystack processing. Query optimization and Redis caching reduced product-list p95 latency from about 36 seconds to 2.4 seconds.

Experience

Work history, roles, and key accomplishments

Backend Engineer

Sesi Technologies

Nov 2025 - Oct 2026 (11 months)

Designed a transactional device-provisioning API with row-level locking and implemented multi-tenancy and RBAC for agricultural platforms. Developed marketplace REST APIs with Paystack integration and strengthened security with JWT rotation and IDOR fixes.

Django Django REST Framework PostgreSQL Celery JWT RBAC Multi tenancy Paystack Security Hardening

Django Developer Intern

Whitebox Media

Sep 2024 - Dec 2024 (3 months)

Built secure sign-up, log-in and password-reset flows with session management for a Django voting application. Wrote unit tests and published Postman API documentation.

Django Authentication Session Management Unit Testing Postman API Documentation