Senior Full Stack Engineer

Senior Full Stack Engineer (React, Node, Python, GCP, AI/ML, ClimateTech) Company Background TekRek is partnering with a high-growth clean-tech startup on a mission to decarbonize the built environment. Adaptis enables organizations to reduce both carbon and cost across the full lifecycle of their buildings through a data-driven platform that empowers smarter decisions from design through operations. Job Description As a Senior Full Stack Engineer, you will: Design and develop powerful tools across the stack—from backend APIs to intuitive front-end interfaces. Shape foundational architecture to support a highly scalable, AI-enabled decarbonization platform. Work closely with product, design, and climate domain experts to deliver fast iterations that directly impact sustainability. Build and own end-to-end features that make AI-powered carbon reduction more accessible and actionable. Contribute best practices and mentor across a tight-knit engineering team focused on speed, impact, and learning. Job Requirements 5 years of experience building full-stack features in fast-moving SaaS environments. Proficiency with Node.js (Express), React (Vite), and MongoDB. Experience with backend development in Python (FastAPI). Familiarity with Google Cloud Platform and deploying scalable infrastructure. Strong problem-solving skills and the ability to work independently in dynamic startup settings. Growth mindset, team-first mentality, and genuine interest in climate impact. Bachelor’s degree in Computer Science, Engineering, Mathematics, or a related field. Why Apply? This is a mission-driven role for builders who want to shape the technical foundation of a platform with real-world climate impact. You’ll work on a cutting-edge stack with modern AI/ML integrations, contribute to product direction, and join a company that’s experimental by nature, deeply collaborative, and committed to professional growth. If you’re based in Toronto and excited to decarbonize buildings through code, reach out to antoine.taugis@tekrek.io to learn more.