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Backend API Developer (C# / .NET 9 / PostgreSQL)
Acelab
Senior backend developer building high‑performance .NET APIs for a material‑selection platform.
6d ago
Intermediate (4-7 years), Experienced (8-12 years), Expert & Leadership (13+ years)
Full Time
Canada
Office Full-Time
Company Size
50 Employees
Service Specialisms
Engineering
Consulting
Design
Technical Services
Project Management
Research and Development
Systems Integration
Automation
Sector Specialisms
Buildings
Residential
Commercial
Industrial
Energy
Infrastructure
Water Resources
Heavy Civil
Role
What you would be doing
api development
data modeling
database architecture
performance optimization
system integration
technical leadership
- API Development: Design and implement RESTful APIs using .NET 9 that provide fast, reliable access to our comprehensive material database and power frontend applications
- Preserve institutional knowledge within architecture firms
- Contribute to technical planning and architecture decisions for backend services
- Implement security best practices including input validation, SQL injection prevention, and secure authentication
- Data Modeling: Design clean domain models and data structures that represent complex material specifications, project workflows, and user interactions
- Database Architecture: Build and optimize PostgreSQL database schemas, queries, and indexing strategies to support complex search, filtering, and relationship queries across hundreds of thousands of materials
- Technical Leadership: Establish backend architecture patterns, conduct code reviews, and mentor team members on best practices for API design and database optimization
- Develop data validation and business logic layers that ensure data integrity and consistency
- System Integration: Create integrations with third-party services, data pipelines, and AI-powered enrichment systems to enhance material information
- Build and optimize PostgreSQL database schemas, stored procedures, and queries for performance and scalability
- Provide easier access to innovative products and collective knowledge
- Create a shared language for materials that enables seamless communication between architects, manufacturers, contractors, and clients
- Performance Optimization: Profile and optimize API endpoints, database queries, and caching strategies to ensure sub-second response times even with large datasets
- Design, develop, and maintain RESTful APIs that serve Material Hub frontend applications and potential integration partners
- Implement comprehensive error handling, logging, and monitoring for production API services
- Collaborate with frontend developers to define API contracts and data structures
- Create and maintain API documentation using OpenAPI/Swagger specifications
- Work with data engineering team to integrate AI-enriched material data into the platform
- Monitor API performance metrics and proactively address bottlenecks or issues
- Participate in code reviews and provide constructive feedback to team members
- Streamline the material selection and specification process
What you bring
.net
git
postgresql
docker
graphql
ci/cd
- Version Control: Strong Git workflow practices with experience in collaborative development environments
- Authentication & Authorization: Experience implementing JWT, OAuth 2.0, or similar authentication patterns
- Entity Framework Core or Dapper for data access with understanding of best practices and performance considerations
- Familiarity with message queues and event-driven architectures (RabbitMQ, Azure Service Bus, or similar)
- Experience with background job processing (Hangfire, Quartz.NET, or similar)
- Expert-level C# and .NET development with proven experience building production APIs in .NET 6+ (ideally .NET 8 or 9)
- Problem Solving: Strategic approach to complex technical challenges with ability to evaluate tradeoffs and make pragmatic decisions
- Experience with Google Cloud Platform (Cloud Run, Cloud SQL, Pub/Sub) or other major cloud platforms
- Background in B2B SaaS or tools for professionals
- Experience working with large-scale data imports and ETL processes
- Advanced PostgreSQL skills including query optimization, indexing strategies, and performance tuning
- Familiarity with CI/CD pipelines and automated deployment practices
- Ownership: Self-motivated with proven ability to take projects from design through production deployment and maintenance
- Performance Mindset: Track record of building high-performance APIs with attention to response times, throughput, and resource efficiency
- Interest in or experience with the AEC (Architecture, Engineering, Construction) industry
- Architectural Thinking: Ability to design scalable, maintainable systems that balance immediate needs with long-term flexibility
- Knowledge of GraphQL API development with Hot Chocolate or similar frameworks
- Docker containerization and experience with container orchestration
- API Design: Strong understanding of REST principles, versioning strategies, and API documentation (OpenAPI/Swagger)
- Collaborative Communication: Excellent communication skills for working across frontend, data engineering, and product teams
- Experience with vector databases and similarity search (pgvector extension for PostgreSQL)
- ASP.NET Core Web API development including middleware, filters, routing, and dependency injection
- Experience with caching strategies using Redis or similar in-memory data stores
- Knowledge of search engines (Elasticsearch, Meilisearch) for full-text search implementation
- Testing: Proficiency with xUnit, NUnit, or similar testing frameworks for unit and integration testing
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Training + DevelopmentInformation not given or found
Interview process
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Visa SponsorshipInformation not given or found
Security clearanceInformation not given or found
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Company
Overview
- Specializes in providing innovative solutions across infrastructure, energy, and industrial sectors.
- Offers advanced technology to enhance operational efficiencies and project outcomes.
- Works on a wide range of projects, from energy infrastructure to complex industrial operations.
- Brings impactful technological advancements with deep expertise in energy systems and industrial applications.
- Known for customized solutions that address the unique challenges of each sector it serves.
- Pioneers new methods for optimizing energy systems and industrial processes.
- Plays a crucial role in shaping the future of critical infrastructure.
- Collaborative work culture with a strong emphasis on teamwork
- Fast‑paced, innovation‑driven environment
- Problem‑solver mindset, empowering employees to contribute to transformative technology in AEC
- Maintains comprehensive sustainability certifications across materials database, including EPDs, Cradle to Cradle, ISO 14001, Energy Star, FSC, Global Recycled Standard, SCS Carbon Neutral and more
- Hosts LCA & EPD educational webinars to support understanding and implementation of life‑cycle assessments
- Promotes metal cladding systems designed for energy efficiency and carbon footprint reduction through reflective coatings and on‑site fabrication
- Supports architects in selecting materials optimized for durability, sustainability, and carbon impact via its Materials Hub platform
- Committed to accessibility and compliance with WCAG 2.1 A/AA standards
- Self‑identified prioritization of diversity, inclusion, and accessibility as corporate values
- No published gender ratio or specific diversity metrics
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