Full stack developer
Confirmed on the employer's own hiring board on Oct 28, 2026. First seen by Alion on Mar 3, 2025.
About Us
Fifty Energy is on a mission to transform how energy is consumed. Our AI solutions redefine the way customers interact with and optimize their energy assets-maximizing value, efficiency, and flexibility. The Fifty AI platform supercharges Power Utilities and Energy companies by enhancing their products and services with advanced AI capabilities-unlocking new value creation for the end user. We are a fast-growing startup at the intersection of AI and energy, building the next generation of intelligent energy management - come join us!
The Role
We’re looking for a talented Full-Stack Developer to join our team. You’ll work on both the front-end and back-end of our AI-powered platform, delivering seamless, user-friendly experiences while optimizing the underlying systems for scalability and performance. Your work will integrate AI-driven functionalities that help our users interact with renewable energy and battery storage solutions in smarter, more efficient ways.
What You’ll Do
Develop and maintain both front-end and back-end systems that leverage AI for real-time energy optimization.
Build user-friendly, scalable web applications and services with AI-enhanced capabilities.
Work closely with AI specialists, designers, and back-end developers to create integrated, intelligent solutions.
Design and implement API integrations with third-party hardware providers and energy systems.
Ensure high performance, security, and reliability of applications, particularly for AI-driven functionalities.
Continuously improve code quality, test coverage, and system performance, focusing on AI model efficiency and scalability.
What We’re Looking For
Deep knowledge in both front-end (TypeScript, React) and back-end development (Python).
Experience working with AI and machine learning models, and an understanding of how to integrate them into applications.
Proficiency with databases (PostgreSQL) and API design (RESTful, MQTT, gRPC).
Experience with cloud platforms like AWS, GCP, or Azure.
Familiarity with CI/CD pipelines, containerization (Docker), and version control (Git).
Strong problem-solving skills with a focus on maintainable, clean code.
Experience in agile development and cross-functional collaboration.
Bonus: Experience with energy systems, IoT, or renewable technologies.
Join us
Ready to help power the future of energy? Our HQ is in Åre, where we love mixing work with fun in the mountains. We’re also hiring for our Stockholm office, which regularly makes its way up to HQ for some mountain time!