Small team. Hard problems. Real impact. Rapid growth. If you want your work and opinions to shape the product, alongside sharp people solving one of the most overlooked technical challenges in climate — building data infrastructure — this is where to be.SISA Energy is a Vancouver-based startup at the intersection of building technology, energy optimization, and data infrastructure. We build the software layer that makes large-scale building retrofits possible — at the portfolio, site, and equipment level.17,000+ buildings on platform20 Billion+ operational data points trackedWe have been contracted by Natural Resources Canada to build Canada’s first national repository of building retrofits — a first‑of‑its‑kind data asset for the country’s built environment. Our platform is deployed with major property associations, utilities, school districts, hospitals, and municipalities. We are generating real, growing revenue from live systems in production.Our products form the Depth‑of‑Insight stack. Three products work standalone, together progressing from portfolio overview to individual equipment behaviour.OpportunityWe are looking for a lead engineer to take deep technical ownership of our platform—InPort, CollectFlow, and VSM. You will work alongside a small team of 2–3 engineers and be the most experienced technical person in the room. This is a coding role first; you will be in the codebase every day, writing production code, making architecture calls, and driving integrations with utility and government systems. Your decisions ship. You are joining a real, deployed system—not a prototype. We have active enterprise clients, live revenue, and a product roadmap backed by national funding.



The platform has meaningful technical complexity and room to grow.What You’ll OwnFull technical ownership of InPort, CollectFlow, and VSMArchitecture and system design across the platformBackend APIs, database design, and third‑party integrations (BC Hydro, FortisBC, ENERGY STAR Portfolio Manager)AI‑assisted development workflow—Claude Code + Jira + AI employee systemInfrastructure, CI/CD, security, and deployment on AWSCollaborating with a small team of 2–3 engineers—reviewing code, setting standards, unblocking othersWhat We’re Looking For8–12 years of software engineering experience, with recent production codeStrong backend development in PHP and Python; comfort with React / TypeScriptExperience with complex relational data systemsTrack record integrating third‑party APIs and government or utility data systemsExperience building AI‑enabled features using LLMsAbility to lead in ambiguous, fast‑moving environmentsStrong SignalsExperience with utility, IoT, building automation, or government systemsHas worked as the most senior engineer on a small teamStrong judgment on when (and when not) to use AI in developmentEnd‑to‑end system ownership—shipped and maintained production systemsHas helped less experienced engineers grow without it being their primary jobNot a Fit IfNo recent production coding—this role writes codeOnly large‑team experience—SISA is a small, high‑trust teamNeeds fully scoped work—you will define and own the scopePrefers management over buildingTech StackPython / Flask · PHP · React / TypeScriptPostgreSQL · AWSLangChain / LangSmith · Claude API / OpenAIMobile apps (iOS & Android)Compensation & Structure$150,000–$185,000 CAD, based on experienceEquity includedVancouver‑based, hybrid schedule#J-18808-Ljbffr

📌 Lead Software Engineer - C$150,000 - C$185,000 A Year (Toronto)
🏢 SISA Energy
📍 Toronto