Staff Scanning Engineer
Censys · Remote (US)
About this role
**Company Background** Censys’ mission is to be the one place to understand everything on the internet. We build the industry’s most comprehensive, accurate, and up-to-date map of the Internet using IP scanning, DNS lookups, web crawling, and the ingestion of millions of certificates—delivering real-time internet intelligence and actionable threat insights to governments, Fortune 500 companies, and leading threat intelligence providers. **Location** Remote within the United States. **Role Summary** We’re looking for a **Staff Software Developer** to design, build, and operate the systems that power Censys’ internet-wide scanning, DNS resolution, attribution, and data pipelines. This role sits at the intersection of backend engineering, distributed systems, and applied internet research. You’ll work on production systems that discover, collect, validate, and enrich internet-scale data across IPs, domains, certificates, services, and cloud infrastructure—improving the accuracy, coverage, freshness, and reliability of the Internet Map that powers Censys’ products and research. **What You’ll Do** - Design, build, and operate internet-scale scanning, DNS, crawling, attribution, and data collection systems. - Own production backend services and pipelines that collect, process, validate, and enrich massive internet datasets. - Improve the quality, freshness, reliability, and coverage of Censys’ Internet Map. - Build systems that support IP scanning, DNS lookups, protocol fingerprinting, asset attribution, and large-scale data ingestion. - Lead technical design for distributed services, streaming pipelines, storage systems, caching layers, scheduling systems, and scan orchestration infrastructure. - Partner with Research, Product, Security, and Engineering teams to turn research ideas into safe, scalable, production-ready systems. - Make thoughtful tradeoffs around reliability, cost, scale, latency, data quality, and operational complexity. - Participate in operational ownership of the systems you build (observability, incident response, and on-call rotation). - Mentor engineers, review designs, and help raise the technical bar for backend and scanning infrastructure. **Skills You Have** - 10+ years of software engineering experience building production systems. - Strong backend engineering experience (data ingestion pipelines, scanning systems, crawlers, schedulers, APIs, storage systems, or high-throughput services). - Experience designing and operating systems for large-scale data / high request volume / internet-scale workloads. - Strong programming experience (primarily **Go**). - Experience with cloud infrastructure (**AWS, GCP, or Azure**). - Experience with message queues or streaming systems (**Google Pub/Sub, Kafka, Kinesis**, or similar). - Experience with distributed databases or large-scale storage systems (**Bigtable, Spanner, HBase, Cassandra, Postgres**, or similar). - Strong understanding of reliability, observability, testing, deployment, and operational ownership. - Ability to write understandable, testable, maintainable code. - Strong technical communication skills. - Good judgment around when and how to use AI-assisted development tools. **Things That Make You Stand Out** - Experience building or operating scanners, crawlers, DNS infrastructure, passive/active measurement systems, or internet data collection platforms. - Deep understanding of DNS (resolution, delegation, record types, nameservers, and operational edge
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