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 to learn more.