Hybrid Junior Full Stack Developer

at Comerc Energia

• Job title: Junior Full Stack Developer
• Job type: Full Time
• Experience level: Junior
• Salary: Not specified
• Degree requirement: Bachelor's Degree
• Tech skills: Angular, Java, JavaScript, Next.js, React, Spring, Spring Boot, SpringBoot, SQL, Vue.js
• Location requirements: Hybrid, Sao Paulo, Brazil

About the role

• Junior Full Stack Developer responsible for developing AI and web products at Comerc Energia. Engage in backend and frontend tasks with a focus on innovative energy solutions.

Responsibilities

• Develop and evolve internal products focused on applied AI and websites/portals, working on interfaces, user journeys, and automations.
• Build and maintain APIs and services in Java, ensuring organization, logging, error handling, and maintainability.
• Develop modern front-end (e.g., React/Next.js) including pages, components, forms, tables, filters, and API integration.
• Work with SQL for queries, investigations, and validation of product data.
• Create and operate crawlers and data collectors, following best practices such as respecting robots.txt, rate limit control, retries, normalization, data persistence, logging, and traceability.
• Integrate generative AI into products (API calls, prompt design, response formatting, and implementation of basic guardrails).
• Support retrieval-augmented generation (RAG) initiatives, connecting knowledge bases, improving relevance, and evaluating response quality.
• Participate in the engineering workflow, including Git versioning, pull requests, code reviews, basic testing, and concise documentation.

Requirements

• Bachelor's degree in Computer Science, Engineering, Information Systems, Systems Analysis and Development, Data Science, or related fields.
• Previous experience in backend development with Java (Spring Boot preferred) and building/consuming REST APIs.
• Knowledge of SQL, including JOINs, aggregations, filters, and data validation.
• Experience with modern frontend development using React, Vue, or Angular (React + Next.js preferred).
• Experience with Git/GitHub for version control, using branches, commits, and pull requests.
• Knowledge in creating and operating crawlers and data collection, following scraping best practices.
• Experience or practical exposure to Generative AI, including API integration and basic prompt usage.

Benefits

• Join our team and be part of Brazil's energy transition journey! ⚡