What does an AWS CloudFront developer do?
An AWS CloudFront developer builds and manages content delivery networks using Amazon CloudFront to serve web assets with low latency. This specialist configures distribution settings to route user requests to the correct origin servers while optimizing cache hit ratios. They write and deploy edge logic to modify HTTP requests and responses before they reach the application backend. The role focuses on tuning performance parameters and securing content through precise policy definitions and function associations.
- Designs and implements cache behaviors that determine how CloudFront handles different types of content requests. The developer defines specific rules for static assets like images and scripts versus dynamic API calls to maximize efficiency. They configure origin groups to provide failover support if the primary server becomes unavailable. This setup ensures users receive content from the nearest edge location without unnecessary delays or errors.
- Creates custom cache policies and origin request policies to control exactly what data enters the cache key. These policies dictate which headers, query strings, or cookies influence the caching decision process. By stripping unnecessary data from the cache key, the developer increases the likelihood of cache hits and reduces load on the origin. They attach these policies to specific distribution behaviors to enforce consistent handling across all user requests.
- Writes and deploys JavaScript code using CloudFront Functions to execute lightweight logic at the network edge. This code runs in response to viewer requests or origin responses to modify headers, rewrite URLs, or generate redirects. The developer tests these functions in a live stage environment using Amazon CloudWatch logs to verify correct behavior. Once validated, they publish the functions and associate them with the appropriate distribution behaviors for production traffic.
- Manages the invalidation process to remove outdated content from edge caches after updates occur on the origin server. The developer uses the AWS CLI or SDK to submit invalidation requests for specific file paths or entire directories. This action forces CloudFront to fetch fresh content from the origin for subsequent user requests. They also maintain technical documentation that explains the rationale behind each configuration choice and edge function implementation.
How to hire an AWS CloudFront developer on Upwork
Step 1: Post a job
Describe your content delivery needs in a few sentences and let Job Post Generator powered by Uma™, Upwork's Mindful AI draft a precise job post for the role. You can write a new post, update a saved draft, or reuse an existing post to start finding candidates.
- Specify requirements for configuring CloudFront distributions, including cache behaviors and origin routing settings.
- List deliverables such as cache policy definitions and origin request policies that control how data reaches your servers.
- Request experience with writing and publishing CloudFront Functions to handle edge logic for requests and responses.
Step 2: Evaluate candidates
Look for portfolios that show configured distributions and deployed edge functions. Uma can run instant video interviews and build shortlists with side-by-side comparisons to help you assess technical fit.
- Check for examples of cache invalidation workflows that refresh content after origin updates.
- Verify experience using AWS CLI or SDKs to manage distribution configuration changes.
- Review documentation they authored for CloudFront configuration and edge behavior rationale.
Step 3: Interview your top choices
Discuss specific strategies for optimizing cache hit ratios and reducing latency. Interviews can be scheduled and conducted within Upwork Messages with an immediate transcript and summary after each one.
- Ask how they test CloudFront Functions before associating them with live distributions.
- Discuss their approach to defining cache keys using origin request policies.
- Explore their method for monitoring edge function logs using Amazon CloudWatch.
Step 4: Agree on scope and begin work
Define milestones for distribution setup, policy creation, and function deployment. Use Upwork Messages and the contract workroom for communication and project management, plus identity verification, payment protection, hourly tracking, and project funds for security.
- Set a milestone for submitting source code for CloudFront Functions and associating them with behaviors.
- Agree on a deliverable for scripts that trigger cache invalidations when origin content changes.
- Require technical documentation that explains the chosen cache policies and routing logic.
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