Intermediate Graph Developer; Semantic Data Platform

About Delta Intelligent Building Technologies (Canada) Inc. (formerly known as Delta Controls)

Delta Intelligent Building Technologies (Canada) Inc. is a leading building controls manufacturer. For over three decades, we have provided innovative building automation solutions for commercial, healthcare, education, and leisure facilities.

Job Summary

We’re looking for an Intermediate Graph Developer to help build a next-generation semantic graph data platform - a “digital twin” layer for buildings, equipment, and their relationships.

This platform will power AI-assisted querying and insights by ingesting RDF-based semantic data, exposing it through APIs and query interfaces, and supporting both cloud and on-prem deployments (with future extensibility to edge environments).

Duties and Responsibilities

Graph Data & Semantic Modeling

• Design and evolve a labeled graph model for entities, relationships, and properties
• Apply RDF, JSON-LD, and built-environment ontologies
• Extend domain models as needed for real-world building systems

Storage Layer & Performance

• Work with graph databases or RDF stores
• Ensure scalable and portable architecture

RDF Ingestion & Validation

• Implement ingestion for Turtle, JSON-LD, and RDF/XML formats
• Maintain triple integrity and query ability after import
• Add robust error handling and optional SHACL validation

Query Interface

• Build and validate a SPARQL-compatible (or equivalent) query endpoint
• Support multi-hop queries and scoped aggregation (per-building vs global)
• Enable natural follow-up query patterns (e.g., narrowing results by floor or system type)

REST API Development

• Create clean, well-documented REST endpoints for entity access and CRUD operations
• Support JSON-LD and pagination for large datasets

Security & Permissions

• Enforce consistent access control across APIs and query layers
• Build event-driven update mechanisms
• Support AI-assisted classification and enrichment with provenance tracking

Attachments & Metadata

• Link documents and media (PDF, DWG, images, spreadsheets, etc.) to graph entities
• Store and expose searchable metadata for attachments

Deployment & Operations

• Implement health checks, TLS, and environment-based configuration

Required

Skills and Abilities

• 3+ years of backend software engineering experience building data-intensive services
• Experience in Python object-oriented programming (OOP), Terraform Infrastructure as Code (IaC), and Amazon Web Services (AWS) cloud services
• 1–2+ years of experience with graph databases, RDF triple stores, or semantic systems
• Working knowledge of RDF, JSON-LD, URIs, and SPARQL (or equivalent graph query patterns)
• Experience building REST APIs with clear contracts and robust error handling
• Experience deploying services on AWS or GCP, with interest in on-prem deployments
• Strong performance mindset, including indexing, query profiling, and debugging slow queries

Preferred

Skills and Abilities

• Familiarity with building and equipment domain modeling, including spaces, equipment, points, and relationships
• Experience with SHACL validation and RDF ingestion pipelines
• Experience designing multi-environment systems (cloud, on-prem, edge) with consistent APIs and feature gating
• Exposure to AI-enabled data systems, including agents, retrieval systems, provenance, and grounding strategies

Work Location: Hybrid (3 days on-site, 2 days remote)

City: Surrey

Type: Full-time, Permanent

Salary: $95,000 to $120,000 CAD

Why work for us?

• Employee & safety centric culture
• Flexible hours and scheduling available
• Competitive total compensation along with generous vacation allowances
• Three weeks of vacation
• in-house & external training provided along with education support and opportunities for growth
• Company funded annual personal development budget
• Financial benefits & planning such as group RRSP & company match
• Employer paid premiums for extended healthcare and family-focused benefits (health, vision and dental)
• Travel insurance coverage and access to the Employee Assistance Program (EAP)
• Wellness - onsite fitness center & company reimbursement for personal gym memberships
• Internal Recognition & Service Awards
• Transit accessible with free onsite parking
• Regular company events such as "Food Truck Fridays", Lunch & Learn and other planned activities