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

Were 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
• Enable efficient traversal queries across large multi-building datasets
• 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
• Support incremental ingestion workflows

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

• Integrate external identity/authorization systems
• Enforce consistent access control across APIs and query layers

Data Updates & Enrichment

• 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

• Deliver containerized services (Docker Compose Kubernetes-ready)
• Support AWS/GCP on-prem deployments
• 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
• 12 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: $95000 to $120000 CAD

This range reflects the minimum and maximum target payable for the base salary of new hires across all Canadian locations. Actual compensation may vary outside this range and is dependent on various factors.

Why work for us

We provide fantastic opportunities to individuals passionate about business and technology. Delta Electronics products are the most energy efficient power products in the industry and our company is perfect for those who want to create design and build sustainable solutions using massively scalable big-data architecture with a strong focus on building automation. Here are some of the Delta perks youll receive from day 1!

• 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
• Employee Referral bonuses
• Transit accessible with free onsite parking
• Regular company events such as Food Truck Fridays Lunch & Learn and other planned activities