The digital world never stops. Every video you stream, call you make, swipe, like, or product you buy online runs through data centers, and those consume an enormous amount of energy. That’s where Coolgradient comes in.
We’re a green-tech start-up on a mission to make our digital lives more sustainable. Our solution, GRADIENT, is a no-code, plug-and-play optimization tool that helps data centers operate more efficiently, sustainably, and cost-effectively. Already in use across the globe, GRADIENT has saved tens of thousands of GWh in energy. And we’re just getting started!
As we scale up, we’re looking for a collaborative Full Stack Engineer to help expand GRADIENT’s reach and drive impactful change in how the world powers digital life.

KEY RESPONSIBILITIES:

• Design, build, and maintain backend services and APIs using TypeScript, Node.js, Fastify, and Sequelize ORM (v7 alpha).
• Work with OLAP/OLTP data models, with a particular focus on Snowflake or similar databases adapted for mixed workloads.
• Improve backend performance, architecture, and stability as we scale to new markets and customers.
• Own backend components, ensuring robust, well-documented, and testable systems.
• Collaborate with frontend developers using React and Vite.
• Work closely with data engineering, product and UX teams to translate complex data into meaningful features.
• Participate in Agile planning, code reviews, CI/CD workflows (GitHub Actions), and team-wide knowledge sharing.

We value a variety of experiences and backgrounds. If you meet most of the criteria and are excited about the role, we encourage you to apply.

• ~5 years of professional software development experience, with strong backend expertise in fast‑paced, product‑driven environments.
• Solid hands-on experience with Node.js, TypeScript, Fastify, and relational/OLAP databases (Snowflake or similar preferred).
• Comfortable working with ORMs like Sequelize and open to engaging with early-stage or evolving tooling.
• Confident operating in Docker/AWS environments, building scalable and maintainable backend services.
• Capable of contributing to the frontend stack when needed, using technologies like React, Vite, Plotly, and TailwindCSS.
• Comfortable operating in a startup environment - adaptable, resourceful, and energized by fast-paced, evolving challenges.
• Bonus: Experience working on SaaS applications in production environments