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Join nesto, a Canadian Rocketship 2025 and Deloitte Fast 50 company (3 consecutive years), as a Senior Applied AI Engineer on the AI Stream team. You'll work on Maestro, nesto's intelligent underwriting and lending engine for mortgage origination, combining deterministic rule-based validation with AI-driven document classification and matching using models like Gemini, Claude, and OpenAI.
As a senior individual contributor, you will autonomously own major features, guide architectural decisions, and set technical direction within the AI agents platform. You'll actively participate in code reviews and collaborative problem-solving, mentoring peers and establishing high technical standards.
Key responsibilities:
- Own end-to-end features and contribute to larger initiatives while clearly presenting trade-offs
- Actively participate in code reviews, collaborate with peers, and provide constructive feedback for quality software design
- Work with cross-functional team members to meet delivery timelines without compromising quality
- Debug, troubleshoot, and improve performance and reliability in your domain
- Design, refine, and optimize AI-driven workflows combining deterministic rules with LLM reasoning, embedding-based search, and structured output extraction
The AI Stream modernizes Canadian mortgage underwriting through cutting-edge intelligent automation. Working within dynamic squads, engineers build, iterate, and continuously refine agentic workflows and AI-driven features powering Maestro. You'll work at the frontier between conventional back-end systems and AI-assisted processing daily.
Company context: nesto is Canada's leading mortgage technology company managing over $73B CAD in residential and commercial mortgage loans, with 1,000+ team members across 12 offices nationwide. The company combines technology, data, and human-centered approach to reinvent how Canadians experience one of life's most important financial decisions. Recognized as CLA Lending Company of the Year for 4 consecutive years and CMP Top Mortgage Employer 2025.
Requirements:
Essential:
- Bachelor's degree in Computer Science, Software Engineering, Data Science, or equivalent professional experience with 5+ years of software development experience
- Strong proficiency with modern web API frameworks (e.g., FastAPI, Flask) and relational databases (e.g., MySQL), with solid back-end development experience
- Hands-on experience shipping LLM-based features in production (prompting, RAG, or structured extraction)
- Strong software engineering fundamentals (testing, design patterns, agile methodology) and excellent collaboration and teamwork capabilities
- Experience designing comprehensive evaluation strategies including golden sets, online/offline evaluations, and regression tracking
Desirable:
- Familiarity with specific LLM orchestration tools (LangChain, LlamaIndex), vector databases, and document intelligence pipelines
- Experience managing production AI trade-offs (cost, latency) and working in regulated domains (e.g., BSIF E-23 compliance)
