Principal Software Engineer, Agentic Data Platform

Horizon3.ai

. Define and drive the technical roadmap for the Database Platform with engineering leadership and the Pentest Platform organization .

Posted 10/14/2026full-timeRemote • United StatesLead💰 $255,000 - $290,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates extensive expertise in PostgreSQL, including query optimization, schema design, and migration strategies, while effectively mentoring engineers and driving database architecture standards across teams.

Highest-signal resume keywords

PostgreSQL ExpertiseSchema Design ReviewDatabase Architecture at ScaleProduction Schema MigrationMentorship and Code Review

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Query OptimizationIndexingPartitioningReplicationConnection PoolingGo ProgrammingPython ProgrammingGraph Data ModelsSchema Migration ToolingDatabase Architecture Tradeoffs

Soft Skills

Clear CommunicationMentoringCollaboration

Tools & Technologies

FlywayGolang-migrateNeo4jAWS Neptune

Industry Keywords

Database Engineering CultureCybersecurity Data BackgroundTime-Series Database ExperienceCompliance KnowledgeAnalytical Query

Tech Stack

Tools & technologies

AWSCyber SecurityNeo4jPostgresPythonGo

About the role

Key responsibilities & impact

Define and drive the technical roadmap for the Database Platform with engineering leadership and the Pentest Platform organization
Own complex database architecture decisions covering schema design, partitioning, migration patterns, and scalability
Produce design documents that establish the team's shared technical model
Serve as the definitive PostgreSQL expert for query optimization, indexing, partitioning, replication, and connection pooling
Architect and guide the graph-based asset model representing hosts, services, credentials, and vulnerabilities across pentests
Own schema design review processes and ensure migrations are safe, reversible, and zero-downtime
Build tooling and engineering practices for rigorous schema changes
Mentor P5 and P4 engineers through code review, design review, and pairing
Partner with Data Ingestion, Asset Inventory, API Platform, and Security Research on data contracts, query performance standards, and architectural guardrails
Write production code and author technical design documents as an individual contributor

Requirements

What you’ll need

Deep, production-proven PostgreSQL expertise, including query planner internals, advanced indexing, partitioning, logical replication, vacuuming at scale, and connection pool tuning
Experience architecting multi-tenant databases at scale, including row-level security and tenant isolation
Experience with production schema migration at scale, zero-downtime migrations, backwards-compatible schema evolution, and migration tooling such as Flyway or golang-migrate
Familiarity with graph data models and graph databases such as Neo4j or AWS Neptune, or graph-like relational query patterns such as recursive CTEs, ltree, or adjacency lists
Proficient in Go or Python and able to write production application code
Demonstrated track record defining database architecture at scale from design document to production across multiple companies or teams
Strong understanding of data architecture tradeoffs, including normalization vs. denormalization, consistency vs. availability, OLTP vs. OLAP separation, and schema-first vs. schema-last design
Ability to reason about long-horizon schema design and substantially larger data volumes
Ability to communicate complex database decisions clearly in design documents, ADRs, and cross-team reviews
Proven ability to drive database standards across multiple teams without direct reporting authority
Experience establishing database engineering culture, including schema review norms, migration safety standards, and query performance review processes
Track record of developing engineers through code review, pair programming, and architectural mentorship
Cybersecurity data background, time-series database experience, compliance knowledge, analytical query or BI/reporting experience, and open-source database contributions are nice to have
Minimum 25 Mbps consumer-grade broadband connection required

Benefits

Comp & perks

Equity package in the form of stock options may be available
Health, vision, and dental care for employees and their families
Flexible vacation policy
Generous parental leave
Remote work flexibility
Career development opportunities
Inclusive and collaborative work culture
Up to 5% travel may be required