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Software Engineer, Security Rules

Lisbon, Portugal💼 Full-time💰 $54,000–$91,000🗓 2026-09-03 → 2026-09-26

Core

Design, implement, and maintain software systems for Cloudflare's Application Security Product Offering, including Rate Limiting and Web Application Firewall.

Role type

Senior Systems Engineer (Security Rules)

Builds

High-scale, fault-tolerant security microservices and distributed systems

Domain

Cybersecurity / Internet Infrastructure

Deliverable

production ML models | product features

Required skills

Rust, Go, C++, distributed systems, monitoring/alerting, debugging high-volume systems, SQL/NoSQL databases

Preferred skills

Unix/Linux development, Prometheus, Grafana, Docker, Kubernetes

Technologies

Rust, Go, PostgreSQL, Clickhouse, Memcached, Docker, Kubernetes, gRPC, Kafka, Clickhouse

Responsibilities

Design and document security systems; write code, automated tests, and monitor production deployments; collaborate with security, network engineering, and product teams; review peer code; mentor team members; debug complex system issues

Seniority

Senior, hands-on IC

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