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Backend API Infrastructure
An anonymized backend infrastructure case covering API services, relational state, cache/state handling, auth, documentation and deployment readiness. Public-safe architecture only: no client, project, domain, endpoint, repository or production data.
The network for creativity
Join 1.25M professional creatives like you
Connect with clients, get discovered, and run your business 100% commission-free
Creatives on Contra have earned over $150M and we are just getting started
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Automated Abandoned Cart Recovery with n8n
Built an automated abandoned-cart recovery system using n8n to identify incomplete purchases, process customer and cart data, and trigger targeted follow-ups.
The workflow uses business rules, scheduled checks, validation, and error handling to reduce manual follow-up and help recover otherwise lost revenue.
POS (Point of Sale) System
This is a production-ready Point of Sale web application designed for retail operations, fully containerized with Docker. It's a modern full-stack system combining a Next.js frontend with a FastAPI backend, PostgreSQL database, and complete business logic for managing sales, inventory, customers, and reporting.
Key Capabilities
Authentication & Access Control — JWT-based auth with role-based permissions (Admin, Manager, Cashier)
Core POS Functions — Fast checkout with product grid, cart management, and multiple payment methods
Business Operations — Product/inventory management, customer tracking with loyalty points, sales & refunds, receipts
Analytics — Dashboard with KPIs, sales trends, product performance, inventory status
Admin Tools — User management, store settings, audit logging, stock movement tracking
Skills Required
CategorySkillsFrontendReact/Next.js 14, TypeScript, Tailwind CSS, component libraries (shadcn/ui), state management (Zustand), async data fetching (TanStack Query)BackendPython, FastAPI, async database patterns, SQLAlchemy ORM, API design (REST/v1)DatabasePostgreSQL, SQL, schema design, database migrations (Alembic)DevOpsDocker, Docker Compose, container orchestration, environment configurationSecurityJWT authentication, refresh token flows, role-based access control (RBAC)
Tools & Technologies
LayerToolsFrontendNext.js 14, TypeScript, Tailwind CSS, shadcn/ui, TanStack Query, ZustandBackendFastAPI, Python 3.12, SQLAlchemy 2.0 (async), Pydantic v2, AlembicDatabasePostgreSQL 16InfrastructureDocker, Docker ComposeArchitectureMonorepo (backend/ + frontend/), RESTful API, JWT-based auth
The project emphasizes simplicity and production-readiness — no Redis/background workers, direct API calls from browser (CORS-enabled), and idempotent startup migrations for reliability.
https://ai-point-of-sale-software.vercel.app/
Just shipped a production serverless system on AWS, and it's live:
🚨 RescueHacks Alert: a discreet emergency-alert system. Dial a USSD code and it instantly notifies your emergency contact via WhatsApp, no visible screen, no app needed, works on any GSM phone.
Stack: AWS Lambda, DynamoDB, API Gateway, EventBridge, SNS, Africa's Talking, WhatsApp Cloud API.
Video below shows the full build and a live demo at the end.
If you need a serverless backend for USSD, SMS, or WhatsApp-based notifications, that's exactly what I build. Open to remote work. 👇
