Senior Cloudflare Security & Edge Engineer (Cloudflare Workers / Google Ads API)

Project Overview We are looking for a highly experienced Cloudflare engineer to design and build a real-time click fraud detection and mitigation platform running primarily on Cloudflare's Edge infrastructure. This is NOT a marketing project. This is NOT Google Ads campaign management. IMPORTANT: We will only consider applicants who can demonstrate real production experience with Cloudflare Workers and distributed edge architectures. Generic full-stack, WordPress, or PPC experience is not relevant for this role. We are building our own proprietary anti-click-fraud system that detects suspicious traffic in real time and automatically manages Google Ads IP exclusions through the Google Ads API. This is an architecture-heavy engineering project requiring experience with distributed systems, edge computing and bot mitigation. Provide links to Cloudflare-related production projects (GitHub, technical blog, conference talk, portfolio or architecture documentation). Applications without demonstrable Cloudflare experience will not be considered. What the platform will do The system will: • collect Google Ads click traffic inside Cloudflare Workers • evaluate traffic in real time • maintain dynamic reputation scores • detect fraudulent traffic using multiple scoring signals • aggregate IP addresses (/24 IPv4 and IPv6 prefixes) • manage TTL, expiration and reputation aging • minimize false positives • automatically synchronize exclusions through the Google Ads API • maintain a fully auditable decision history • allow every automated action to be reverted Required Technical Experience Applicants should have proven commercial experience with as many of the following technologies as possible: Cloudflare • Cloudflare Workers • Cloudflare WAF • Cloudflare Bot Management • Rate Limiting • Durable Objects • Workers KV • R2 • Queues (nice to have) Security • Bot Detection • IP Reputation • Abuse Detection • Real-time Decision Engines • Fraud Detection • Traffic Classification Networking • IPv4 • IPv6 • CIDR aggregation • IP normalization • Prefix aggregation • ASN knowledge is a plus Google • Google Ads API • API authentication • Automated IP exclusion management Architecture • Distributed systems • High availability • Low latency • High request throughput • Large-scale data structures • Fault tolerance • Audit logging Required Technical Experience Applicants should have proven commercial experience with as many of the following technologies as possible: Cloudflare • Cloudflare Workers • Cloudflare WAF • Cloudflare Bot Management • Rate Limiting • Durable Objects • Workers KV • R2 • Queues (nice to have) Security • Bot Detection • IP Reputation • Abuse Detection • Real-time Decision Engines • Fraud Detection • Traffic Classification Networking • IPv4 • IPv6 • CIDR aggregation • IP normalization • Prefix aggregation • ASN knowledge is a plus Google • Google Ads API • API authentication • Automated IP exclusion management Architecture • Distributed systems • High availability • Low latency • High request throughput • Large-scale data structures • Fault tolerance • Audit logging Please do NOT apply if you are primarily: • PPC Manager • Google Ads campaign manager • Marketing agency • WordPress developer • PHP developer • General full-stack developer without Cloudflare experience • Someone who has only configured DNS or basic WAF rules Deliverables The selected engineer will help us: • design the overall architecture • define the scoring engine • implement Cloudflare Workers • implement data storage strategy • design IP aggregation algorithms • build the automation layer • integrate Google Ads API • optimize performance • document the architecture To Apply Please include: 1. LinkedIn profile 2. GitHub profile (if available) 3. Short technical introduction 4. Three relevant projects 5. Your role in those projects 6. Hourly rate or fixed project estimate 7. Earliest availability Screening Question (Required) Please answer all of the following: 1. Have you built production systems using Cloudflare Workers? 2. Have you worked with Cloudflare Bot Management? 3. Have you implemented a real-time scoring engine? 4. Have you worked with Google Ads API? 5. Have you designed systems processing over 100M requests/month? 6. What would you use for storing dynamic reputation data inside the Cloudflare ecosystem? 7. How would you reduce false positives in an automated IP blocking system? Selection Process We are looking to shortlist 3–5 senior engineers for a technical interview. Our goal is to find someone capable of designing and implementing a production-grade, real-time Cloudflare-based anti-click-fraud platform—not a general software developer.