Description
Junior Back-End Developer (/Part-time; Lisboa; Hybrid/Remote)
Watt-IS is accelerating the energy transition through AI-powered solutions that empower utilities, energy retailers, and energy communities to optimize energy usage and reduce carbon emissions.
We’re looking for a talented Junior Back-End Developer to support our existing micro-services architecture, develop new services and integrate them with our platforms.
Responsibilities:
Develop new functionalities for existing and new projects
Maintain existing and new projects
Develop technical specifications based on functional requirements
Technical skills:
Experience in database design and data modeling (ER Diagrams)
Experience in querying and storing data in SQL (PostgreSQL, SQL Server) and/or NoSQL (MongoDB) databases
Experience in developing, documenting and testing JSON-based REST Web APIs (FastAPI, Pydantic, Express.js)
Experience using HTTP clients to interact with JSON-based REST Web APIs
Experience with Git and Linux environments
Familiarity with Ruby and Ruby on Rails (or similar frameworks like Laravel, Spring MVC)
Understanding of Micro-services architecture
Requirements:
Degree in Computer Science, Electrical or Electronics Engineering, or equivalent
Excellent communication (written and oral) and interpersonal skills
Fluent in English
Proven ability to work creatively and analytically in a problem-solving environment
Willingness to learn and adapt to new concepts, technologies and to collaborate with other team members
Nice to have:
Experience developing static web pages with HTML, CSS and JavaScript
Experience developing web apps with React and Tailwind CSS (or similar frameworks)
Experience with data science, machine-learning and AI with Python, R or Matlab
Familiarity with DevOps practices - Docker and Cloud-based services (Azure, AWS)
Send us your CV and motivation letter to careers@watt-is.com with the subject “Junior Back-End Developer 25.12”.
Weather on start day
Friday, 9 de January — Showers · Max 16° · Min 11° · Rain 53% (0.4mm) · Wind 16 km/h
Previsão para os dias seguintes
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Sat, 10 JanPartly cloudyMax 15° · Min 10°
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Sun, 11 Jan—Max 16° · Min 9°
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Mon, 12 JanShowersMax 16° · Min 12°
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Tue, 13 JanShowersMax 15° · Min 12°
Detalhes
- Listing type
- Job Offer
- Schedule Type
- Full-time
- Category
- Tecnologia
- Status
- —
- Location
- Lisboa, PT
- Start
- 02/01/2026