Contact person: Business Client

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Location: Cyberjaya, Malaysia

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"Job Post: Backend Engineer (Traffic Identification & Routing)
What We're Building:
We need to build a "smart link routing system." In simple terms, it's a system where different people clicking the same short link will see completely different content.

Your Main Responsibilities:

Manage the "Short Links" (The Bait):

Build a service like [login to view URL] or [login to view URL] for generating and managing short links.

The core task is simple: when a user visits a short link, your server tells their browser, "Please redirect to this other address."

Develop the Core "Brain" (The Decision Engine):

This is the most critical part! You will write a program that, in the split second before redirecting the user, identifies who they are.

How? By checking the visitor's information:

Check the User-Agent: Identify if the visitor is a search engine crawler (like Googlebot) or a real user on an iPhone or Android.

Check the IP Address: Determine if the IP belongs to a datacenter (like AWS, Google Cloud) or is from a known security/virus scanning company.

Then what? Based on your analysis, you take different actions:

IF it's a crawler or a security scanner -> Show them a harmless, normal page (like a generic image or article).

ELSE (if it's a real user) -> Seamlessly redirect them to our intended target page.

System Integration & Maintenance:

Ensure the "Brain" works reliably with the short link service and third-party platforms (like Google Docs).

Maintain and update IP blocklists and crawler signature databases to make the system smarter over time.

Skills We're Looking For:

Technical Skills:

Proficiency in at least one backend language: Python (Preferred), Go, Java, or Node.js.

Solid understanding of HTTP protocols (know how 301/302 redirects work inside and out).

Experience handling high-concurrency requests to make the "Brain" lightning-fast.

Core Competence:

Ability to write clean and efficient "if/else" decision-making logic.

Know how to parse and utilize User-Agent strings and IP addresses for identification.

Experience with caching like Redis is a big plus.

Soft Skills:

A self-starter who can solve problems independently and enjoys technical challenges.

An interest in cybersecurity and the "cat-and-mouse" dynamics of web traffic.

Why Join:

You'll build a core system that handles complex logic, not just simple CRUD apps.

Great technical challenge that will rapidly advance your skills in network protocols, traffic analysis, and high-performance systems.

Remote work, flexible hours, and highly competitive pay." (client-provided description)