Principal Software Developer

Hexagon AB; United States; Remote; USD 140,000 - 190,000; Full time

Job summary

Hexagon AB's Octave platform seeks a Principal Software Developer to own the Graph Engineer role, combining knowledge engineering, graph data modeling, and software engineering.

You will design and govern the ontology, build the graph construction pipeline, and ensure the graph remains trustworthy, current, and highly queryable.

This remote-friendly position supports multiple U.S. sites (Houston, Madison, New York) and emphasizes cross‑domain reasoning across industrial assets.

Qualifications

• 5+ years in data or knowledge engineering
• Experience designing graph data models for production systems
• Familiar with LPG data models and graph databases
• Proficiency in Java or Python and Spring Boot
• Experience with LLM-assisted data engineering and schema synthesis
• Strong ontology design principles and data modeling instincts

Responsibilities

• Own the Octave canonical ontology - the labeled property graph (LPG) schema
• Lead ontology tool development (Platform Studio Data Engineering Tool) including schema parsing and synthesis
• Design and implement the entity resolution layer for cross-product identities
• Own provenance and lineage metadata, source attribution, freshness, and conflict notes
• Collaborate with domain experts to encode knowledge into the ontology taxonomy and relationships
• Design the graph query surface for Aria agents and MCP tool schemas
• Drive ontology versioning, schema evolution, deprecation, and compatibility
• Contribute to knowledge engineering methodology for eliciting tacit domain expertise

Skills

Graph data modeling

LPG data models

Graph databases

Cypher

Java

Python

Ontology design

Data modeling

Tools

Neo4j

Amazon Neptune

Platform Studio Data Engineering Tool

Spring Boot

Fabric notebooks

OData

OpenAPI

GraphQL tooling

Job description

Principal Software Developer

Job Location (Short): Houston, Texas-USA | Madison, Alabama-USA | New York - Home Office, New York-USA

Workplace Type: Remote

Req Id: 3348

Responsibilities

The Graph Engineer owns the Octave platform's knowledge graph - the canonical, cross-product representation of industrial intelligence that powers every agent, model, and application built on the platform. This role sits at the intersection of knowledge engineering, graph data modeling, and software engineering. The Graph Engineer is responsible for designing the ontology that makes cross-domain reasoning possible, building and operating the graph construction pipeline, and ensuring the graph remains trustworthy, current, and queryable at the quality level the platform's intelligence depends on.

• Own the Octave canonical ontology - the labeled property graph (LPG) schema that unifies entities across Design, Build, Operate, and Protect product domains into a single coherent knowledge model
• Lead the ongoing development of the ontology authoring tool (the Platform Studio Data Engineering Tool), including schema parsing, LLM-assisted canonical synthesis, and Fabric notebook generation
• Design and implement the entity resolution layer - the mechanism that reconciles cross-product identities (e.g. Pump P-401 in Forte 3D = P-401 in Sequence = asset #4017734 in Attune) with deterministic, stable cross-product identifiers
• Own provenance and lineage at the graph level - ensuring every node and edge carries source attribution, freshness metadata, and conflict resolution records
• Collaborate with domain experts across product teams to extract institutional knowledge and encode it into the ontology's domain taxonomy, JTBD libraries, and relationship semantics
• Design the query surface exposed to Aria agents - graph traversal patterns, MCP tool schemas for graph access, and the semantic contract agents rely on
• Drive ontology versioning discipline: schema evolution strategy, deprecation policy, and compatibility guarantees for downstream consumers
• Contribute to the knowledge engineering methodology - the process for eliciting tacit domain expertise from capital project practitioners and encoding it into the graph

Education / Qualifications

• 5+ years in data or knowledge engineering, with specific experience designing and building graph data models for production systems
• Deep familiarity with labeled property graph (LPG) data models and graph databases (Neo4j, Amazon Neptune, or comparable)
• Experience with graph query languages - Cypher, SPARQL, or GraphQL over graph data
• Strong understanding of ontology design principles - entity modeling, relationship semantics, property typing, and ontology versioning
• Hands‑on experience with OData and/or OpenAPI schema parsing and transformation
• Proficiency in Java or Python - the ontology tool backend is a Spring Boot Java application
• Experience with LLM‑assisted data engineering: prompt engineering for structured JSON output, schema synthesis, and mapping validation
• Strong data modeling instincts - understanding when to normalize vs. denormalize, how to handle temporal data, and how to design for queryability
• Ability to work with domain experts to translate institutional knowledge into formal schema constructs

Preferred:

• Experience with industrial ontology standards (ISO 15926, OSDU, IFC, ISA-95)
• Background in capital project delivery, EPC, or industrial asset management domains
• Familiarity with Microsoft Fabric Delta tables as a graph construction source
• Experience with knowledge graph contextualization and entity matching at scale

About Octave

Octave provides mission‑critical software that empowers organizations to make informed decisions across every stage of the asset lifecycle - Design, Build, Operate and Protect - where performance, safety, and reliability are non‑negotiable and failure is not an option.

Turning complex operational data into actionable intelligence, Octave connects expertise, real‑world conditions and enterprise‑scale insight to improve performance, resilience and incident response where it matters most.

Octave has more than 7,000 employees in 45 countries. Learn more at octave.com and follow us on LinkedIn.

Why work for Octave?

All in. Always forward. That's the way we do things around here. We put trust in our people because we believe it's the best way to unleash potential, bring ideas to life, and keep moving ahead. And it's why we're committed to creating an environment that's truly supportive, providing you with the resources you need to support your ambitions, no matter who you are or where you are in the world.

Respect is the cornerstone of how we operate, so speak up and be yourself. You're valued here.

Everyone is welcome

At Octave, we believe that diverse and inclusive teams are critical to the success of our people and our business. Here, everyone is welcome. As an inclusive workplace, we don't discriminate. In fact, we embrace differences and are fully committed to creating equal opportunities, an inclusive environment, and fairness for all.