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# Staff Software Engineer

- **Company:** HORIZON 3, LLC
- **Location:** United States (Remote available)
- **Experience:** Expert
- **Salary:** $229,500.0 - $260,000.0
- **Contract:** Permanent contract
- **Skills:** Query Performance, Code Review, Cyber Security, Databases, Customer Data Management, Data Infrastructure, Data Stores, Database Design, Graph Database, Network Topologies, Python (Programming Language), PostgreSQL, Neo4j, Reliability Engineering, Software Engineering, Grafana, Database Optimization, Kubernetes, Production Code, Vertica
- **Published:** October 27, 2026
- **Apply:** https://startup.jobs/staff-software-engineer-database-platform-horizon3-ai-10574375

## About the Role

* 8+ years of professional software engineering experience with deep specialization in database systems and data infrastructure
 * Expert-level PostgreSQL proficiency - you have tuned complex production query plans, managed replication topology, and debugged the hardest vacuum and locking issues
 * Deep understanding of database architecture trade-offs: normalization vs. denormalization, indexing strategies (partial, composite, covering), partitioning, and connection pooling at scale
 * Experience designing zero-downtime migration workflows in high-volume production environments

Systems & Architecture

 * Experience with graph databases (Neo4j or equivalent) - NodeZero's asset model is fundamentally graph-structured and you need to be comfortable in that paradigm
 * Proficiency with time-series or columnar stores (ClickHouse, TimescaleDB, or equivalent) for high-throughput analytics workloads
 * Track record running database systems in Kubernetes or cloud-managed environments (RDS, Cloud SQL, or equivalent) at production scale
 * Proficiency in Go or Python for building tooling, access layers, and migration infrastructure

Technical Leadership

 * Track record of setting engineering standards that other engineers adopt - database design guidelines, query review checklists, schema governance patterns
 * Ability to produce clear architecture documents and drive database design decisions across team boundaries
 * Experience mentoring mid-level engineers through database design review and code review

Nice to Haves

 * Experience building multi-tenant database architectures where customer data isolation is a hard requirement
 * Background in cybersecurity or experience storing and querying vulnerability, asset, or network topology data at scale
 * Familiarity with eBPF-based database observability tools or advanced profiling approaches
 * Experience with vector databases or embedding stores for ML-adjacent infrastructure

## Description

The Staff Engineer on the DB Platform team is the technical anchor for database architecture and reliability across Horizon3. NodeZero runs thousands of pentests generating enormous volumes of structured data - vulnerability findings, asset graphs, scan histories, time-series telemetry, and customer configurations. Every team at Horizon3 depends on the data stores this team builds and operates. You will set the technical direction for how Horizon3 designs, provisions, scales, and operates its database systems - from PostgreSQL and graph databases to time-series stores., * Database Architecture: Set the technical direction for Horizon3's database systems - schema design philosophy, data modeling standards, indexing strategies, and query contract design across teams

 * Performance Engineering: Own query performance across the platform - identify slow queries, produce execution plan analyses, implement fixes, and design the observability systems that catch regressions early
 * Reliability & Operations: Own the reliability engineering for all data stores - replication, failover, backup validation, capacity planning, and database incident response
 * Migration Engineering: Design and own the migration framework that makes schema evolution safe in production - zero-downtime migrations, reversible changes, and migration testing standards
 * Cross-team Enablement: Serve as the database expert for application engineering teams - review their schemas, query patterns, and ORM usage; set the access patterns that prevent problems from reaching production
 * Mentorship: Mentor P4 engineers through design review, code review, and deep technical pairing; be the person the team turns to when they hit a hard database problem