Design an OOD notification template engine
Reported in ASML European engineering loops. Object model design for template rendering and channel-specific formatting.
Interview scenario
Context for ASML candidates:
Render personalized templates for email, SMS, and push with reusable placeholders.
Model answer
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Cover trade-offs, structure, and a concrete example before revealing the baseline response.
How to frame this at ASML: Connect your answer to measurable impact, clarity of thought, and trade-offs the team cares about. Below is a strong baseline response you can adapt with your own project examples.
Model Template, TemplateVersion, PlaceholderResolver, and Renderer abstractions. Keep rendering pipeline open for channel-specific formatters while sharing common validation and variable substitution flow.
Use strategy or chain-of-responsibility for placeholder resolution from user profile, event payload, and fallback defaults. Add strict validation so missing mandatory placeholders fail fast before send.
Discuss versioning and backward compatibility: once a template version is used in production campaigns, treat it as immutable and create new versions for edits.
Discussion
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