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Senior Software Engineer, Security Rules

Lisbon, Portugal💼 Full-time💰 $66,000–$91,000🗓 2026-09-07 → 2026-09-25

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

Internet Security / Cloud Infrastructure

Deliverable

production ML models | product features

Required skills

Rust, Go, C++, distributed systems design, system architecture, code review, technical leadership, mentoring, debugging high-volume production systems, SQL/NoSQL databases

Preferred skills

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

Technologies

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

Responsibilities

Design and execute complex technical projects; collaborate with security, network engineering, and product teams; raise the technical bar by identifying systemic improvements; mentor engineers and provide code/design feedback; review peer work across the development lifecycle.

Seniority

Senior, hands-on IC with mentorship responsibilities

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