Should portfolio payment projects use test mode or live mode?

Always use test mode for portfolio projects. Use Paystack test keys and test card 4084084084084081. Never hardcode test keys in your repo — use environment variables even for test keys. A recruiter or client reviewing your code who sees sk_test_... in a .env file is fine; seeing it hardcoded in source is a red flag.

How long should I spend on each portfolio project?

A well-built simple checkout with webhook handler: 2-3 days. A subscription system: 1 week. A marketplace with split payments: 1-2 weeks. Do not rush to add features — spend the extra time writing tests and documentation. A minimal, well-tested, well-documented project is more impressive than a large, poorly-documented one.

Do I need to include a frontend in each project?

For client-facing portfolio projects, yes — a minimal HTML/React frontend that shows the checkout flow improves the demo. For an API-only project (like a payout system), a Postman collection or curl examples in the README are sufficient. Interviewers at product companies want to see the full flow; API-focused companies care more about the backend and tests.

By Bonaventure Ogeto|Updated July 22, 2026

Building a Payments Portfolio That Gets You Hired

Build these 5 projects: 1) Basic Paystack checkout with webhook handler and idempotency. 2) Subscription billing system with dunning logic. 3) Marketplace with subaccount split payments. 4) Payout system with transfer approval workflow. 5) A webhook HMAC validator with test suite. Document each with: architecture decisions, security choices, test coverage %, and a live demo link.

The Five Portfolio Projects

Project	What It Demonstrates	Complexity
Simple checkout + webhook handler	Basic API integration, HMAC validation, idempotency, order fulfillment	Beginner
Subscription billing with dunning	Paystack Plans, invoice.payment_failed handling, retry logic, subscription lifecycle	Intermediate
Marketplace with split payments	Subaccounts, bearer configuration, multi-vendor payout	Intermediate
Payout system with approval workflow	Transfer API, dual-approval, batch transfers, transfer.failed retry	Advanced
M-Pesa + Paystack dual checkout	Multiple payment methods, STK push, webhook routing by method	Advanced

What to Document in Each Project

For each portfolio project, your README should answer:

What the system does — one paragraph, business use case, not just technical description.
Architecture diagram — even a simple boxes-and-arrows showing: client, server, Paystack, database, webhook processor.
Security choices — "Webhook signatures validated with HMAC-SHA512. Secret key in environment variable. No card data stored."
Test coverage — "85% line coverage. Unit tests: webhook signature validation, idempotency check. Integration tests: full charge.success flow against Paystack test mode."
Edge cases handled — "Duplicate webhook events are idempotent. Network timeout on verify results in a retry with exponential backoff."
Live demo link — deploy to Vercel/Railway/Render with Paystack test mode keys.

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Key Takeaways

✓Employers want to see webhook handling and idempotency — not just a working checkout.
✓Include your test coverage percentage and what you tested for in each portfolio project.
✓Document security decisions: how you store keys, how you validate webhooks, what you log.
✓A live demo + GitHub repo with a README beats a screenshot-only portfolio.
✓Five focused payment projects beat twenty general projects for fintech hiring.

Frequently Asked Questions

Should portfolio payment projects use test mode or live mode?: Always use test mode for portfolio projects. Use Paystack test keys and test card 4084084084084081. Never hardcode test keys in your repo — use environment variables even for test keys. A recruiter or client reviewing your code who sees sk_test_... in a .env file is fine; seeing it hardcoded in source is a red flag.
How long should I spend on each portfolio project?: A well-built simple checkout with webhook handler: 2-3 days. A subscription system: 1 week. A marketplace with split payments: 1-2 weeks. Do not rush to add features — spend the extra time writing tests and documentation. A minimal, well-tested, well-documented project is more impressive than a large, poorly-documented one.
Do I need to include a frontend in each project?: For client-facing portfolio projects, yes — a minimal HTML/React frontend that shows the checkout flow improves the demo. For an API-only project (like a payout system), a Postman collection or curl examples in the README are sufficient. Interviewers at product companies want to see the full flow; API-focused companies care more about the backend and tests.

Learn Paystack Integration

KES 2,999

The definitive guide to building payment systems with Paystack — from your first transaction to production-grade payment infrastructure across Africa. 9 modules, 47 lessons. Free preview available.

Start Paystack Course

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By Bonaventure Ogeto|Updated July 22, 2026

Building a Payments Portfolio That Gets You Hired

The Five Portfolio Projects

Project	What It Demonstrates	Complexity
Simple checkout + webhook handler	Basic API integration, HMAC validation, idempotency, order fulfillment	Beginner
Subscription billing with dunning	Paystack Plans, invoice.payment_failed handling, retry logic, subscription lifecycle	Intermediate
Marketplace with split payments	Subaccounts, bearer configuration, multi-vendor payout	Intermediate
Payout system with approval workflow	Transfer API, dual-approval, batch transfers, transfer.failed retry	Advanced
M-Pesa + Paystack dual checkout	Multiple payment methods, STK push, webhook routing by method	Advanced

What to Document in Each Project

For each portfolio project, your README should answer:

What the system does — one paragraph, business use case, not just technical description.
Architecture diagram — even a simple boxes-and-arrows showing: client, server, Paystack, database, webhook processor.
Security choices — "Webhook signatures validated with HMAC-SHA512. Secret key in environment variable. No card data stored."
Test coverage — "85% line coverage. Unit tests: webhook signature validation, idempotency check. Integration tests: full charge.success flow against Paystack test mode."
Edge cases handled — "Duplicate webhook events are idempotent. Network timeout on verify results in a retry with exponential backoff."
Live demo link — deploy to Vercel/Railway/Render with Paystack test mode keys.

Get weekly developer tips

Join 25,000+ developers. Practical guides, job tips, and new content — straight to your inbox.

No spam. Unsubscribe anytime.

Start Building

See portfolio project walkthroughs for step-by-step guides.

Sign up for the McTaba newsletter

Key Takeaways

✓Employers want to see webhook handling and idempotency — not just a working checkout.
✓Include your test coverage percentage and what you tested for in each portfolio project.
✓Document security decisions: how you store keys, how you validate webhooks, what you log.
✓A live demo + GitHub repo with a README beats a screenshot-only portfolio.
✓Five focused payment projects beat twenty general projects for fintech hiring.

Frequently Asked Questions

Should portfolio payment projects use test mode or live mode?: Always use test mode for portfolio projects. Use Paystack test keys and test card 4084084084084081. Never hardcode test keys in your repo — use environment variables even for test keys. A recruiter or client reviewing your code who sees sk_test_... in a .env file is fine; seeing it hardcoded in source is a red flag.
How long should I spend on each portfolio project?: A well-built simple checkout with webhook handler: 2-3 days. A subscription system: 1 week. A marketplace with split payments: 1-2 weeks. Do not rush to add features — spend the extra time writing tests and documentation. A minimal, well-tested, well-documented project is more impressive than a large, poorly-documented one.
Do I need to include a frontend in each project?: For client-facing portfolio projects, yes — a minimal HTML/React frontend that shows the checkout flow improves the demo. For an API-only project (like a payout system), a Postman collection or curl examples in the README are sufficient. Interviewers at product companies want to see the full flow; API-focused companies care more about the backend and tests.

Learn Paystack Integration

KES 2,999

The definitive guide to building payment systems with Paystack — from your first transaction to production-grade payment infrastructure across Africa. 9 modules, 47 lessons. Free preview available.

Start Paystack Course

Not ready? Create Free Account