A developer portfolio is stronger when a reviewer can understand the problem, your contribution and the decisions behind the code. A small project you can explain is more useful than a large repository assembled from parts you do not understand.

Use your own work, public resources and synthetic data. Do not expose private keys, customer records or employer code.

1. A small task tracker

Define the user and a few real requirements. Explain how tasks change state and what happens when information is missing. Keep the scope small enough to test and maintain.

2. A searchable public-data view

Use a dataset whose permitted use you have checked. Explain the source, updates, filtering and limitations. Avoid implying your demonstration is an official government service.

3. A tested API demonstration

Build a simple permitted service and document inputs, outputs and failure cases. Show how you test invalid requests without publishing credentials or targeting a system you do not own.

4. An accessible form flow

Demonstrate labels, helpful errors and keyboard use. Explain which checks you performed and which remain incomplete, instead of claiming universal accessibility from one quick review.

5. A defect investigation

Use your own project to show how you reproduced a problem, found a cause and verified a correction. Include the reasoning rather than only the final code change.

6. A maintenance improvement

Refactor a small section with a clear purpose and relevant checks. Explain why the change improves understanding or reliability, while acknowledging any trade-off or unresolved issue.

7. A clear project handover

Write setup instructions, a simple design explanation and known limitations. Test whether another person can follow the instructions without private context or access to your personal accounts.

Choose the next practical step

Choose one or two pieces relevant to the vacancy. Attribute libraries and assistance accurately and explain your own contribution. The non-creative portfolio guide gives a useful evidence structure. Avoid presenting a demonstration as a production-ready system or copying confidential code to make the portfolio appear more substantial.