Building Modern Web Applications for Public Services

Design for the constrained user

Public services are used on older devices, shared computers, and intermittent mobile connections. An application tuned only on a fast laptop excludes a meaningful portion of the population it is funded to serve.

Server-rendered initial content, conservative client bundles, and progressive enhancement are not stylistic preferences in this context; they determine whether the service is usable.

Resilience over cleverness

Systems that age well tend to be boring in the right places.

• Idempotent submissions, so a retried request does not create duplicate records.
• Explicit timeouts and fallbacks for every external dependency.
• Server-side validation that never assumes the client enforced anything.
• Structured logging and health checks designed before launch.
• Feature flags for staged rollout of anything touching an eligibility or payment path.

Maintainability is a procurement concern

A service outlives the contract that produced it. Conventional framework choices, documented environment setup, automated tests around critical paths, and readable data models decide whether the next team can operate the system or must replace it.

Accessibility and security are not phases

Both degrade quietly when treated as milestones. Keeping automated checks for each in the pipeline preserves the quality that the launch team achieved after that team rotates off.