You will get blazing-fast API Integrations & custom API development in Go (Golang)
Project details
You will get a high-performance API integration or backend service built with Go.
I’ve worked with startups and small teams to build systems for e-commerce, delivery platforms, and internal tools—focusing on speed, security, and clean architecture. Whether you need to connect to a third-party service or build a custom API from scratch, I deliver reliable, production-ready solutions that are easy to maintain and scale.
I’ve worked with startups and small teams to build systems for e-commerce, delivery platforms, and internal tools—focusing on speed, security, and clean architecture. Whether you need to connect to a third-party service or build a custom API from scratch, I deliver reliable, production-ready solutions that are easy to maintain and scale.
Programming Languages
JavaScript, GoCoding Expertise
Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$50
|
Standard
$150
|
Advanced
$1,200
|
|---|---|---|---|
| Delivery Time | 2 days | 3 days | 7 days |
Number of Revisions | 2 | 0 | 3 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code |
Optional add-ons
You can add these on the next page.
Swagger Documentation
(+ 1 Day)
+$50
OAuth Integration
+$100
Rush Delivery
+$50About Osas
Fintech Backend Engineer | FastAPI, Go, Payment APIs & Virtual Cards
Benin City, Nigeria - 1:48 am local time
Currently the sole backend engineer at a dual-currency (NGN/USD) fintech platform, where I own everything from architecture to production: FastAPI + MongoDB, Celery async jobs, HMAC-based auth, webhook integrations, and zero-downtime DigitalOcean deployments via GitHub Actions and Kamal.
Previously built a WhatsApp-integrated food ordering platform and high-availability financial services at a fintech/food-tech company, improving system response time by 40% through Redis caching and query optimization.
What I can build for you:
* Payment gateway integrations (Stripe, Flutterwave, Paystack, etc.)
* Virtual card systems with reconciliation and idempotency
* Secure REST APIs in FastAPI or Go (Gin/Fiber)
* Background job processing with Celery or Go workers
* CI/CD pipelines and DigitalOcean/Docker deployments
* Webhook systems with logging and failure recovery
I work best with startups and fintech companies that need reliable, security-conscious backend engineers, not just someone who can write code, but someone who understands what breaks in production.
Steps for completing your project
After purchasing the project, send requirements so Osas can start the project.
Delivery time starts when Osas receives requirements from you.
Osas works on your project following the steps below.
Revisions may occur after the delivery date.
client get active feedbacks on development process