Job Summary: We are looking for a Senior Software Engineer to design and develop scalable APIs, make architectural decisions, and mentor the team in an environment that values collaborative autonomy. Key Highlights: 1. Work in an environment that values Responsible Freedom and Collaborative Autonomy 2. Actively participate in technical and product decisions 3. Mentor junior developers and elevate the team’s overall skill level We are expanding our Technology team to tackle challenges that go beyond coding. If you value Responsible Freedom, Collaborative Autonomy, and want to work in an environment where your technical opinion truly matters—this role is for you. **Responsibilities and Duties** What we expect from a true Senior: We’re not looking for someone who merely “masters frameworks.” We seek someone who: * Considers trade-offs, not absolute solutions * Asks “why” before jumping into coding * Connects technical decisions to business impact Your responsibilities: * Design and develop scalable and resilient APIs * Make architectural decisions autonomously (and responsibly) * Identify and resolve performance bottlenecks * Ensure quality through testing, observability, and best practices * Refactor legacy code judiciously—knowing what to tackle first * Mentor more junior developers and elevate the team’s overall skill level * Actively participate in technical and product decisions Primary Tech Stack: * Backend: PHP/Laravel, Node.js * Frontend: React * Database: MySQL * Infrastructure: AWS, Git, CI/CD, PM2/Cluster **Requirements and Qualifications** What you must master: Backend & Architecture: * Scalability: stateless architecture, caching, queues, horizontal vs. vertical scaling * Production error handling: structured logging, circuit breaker, graceful shutdown * Separation of concerns, dependency inversion, loose coupling Databases: * SQL vs. NoSQL — knowing when to use each * Identifying performance bottlenecks * Transactions, concurrency, and race conditions APIs & Integrations: * REST vs. GraphQL — context matters * API versioning * Idempotency and error- and DX-aware design Frontend (True Full Stack): * State management in large applications * SSR vs. CSR vs. hybrid — knowing how to choose * Performance: what to measure and how to optimize Quality & Production: * Meaningful tests (not just high coverage) * Monitoring and observability * Responding to production incidents Soft Skills We Value: * Clear communication — both technical and non-technical * Ability to respectfully disagree with sound reasoning * Understanding that “perfect” and “delivered” depend on context * Capacity to teach and learn simultaneously * Thinking about maintainability, not just delivery **Additional Information** * CLT employment contract * Competitive salary (to be negotiated) * Health insurance plan * Meal voucher + Transportation voucher * Wellhub * Birthday day off This is what drives us at **77Sol**! From day one, our mission has been to transform the solar energy market in Brazil. We combine **technology, innovation, and sustainability** to connect entrepreneurs and consumers with intelligent solutions that make solar energy more accessible and viable. Today, we are a **sector benchmark**, and our growth reflects the impact we generate. We’ve been recognized among the **most innovative energy startups**, and ranked in the **Top 3 of Exame Magazine’s “Businesses in Expansion” Ranking**, highlighting us among the fastest-growing companies in 2022. Our presence at **Intersolar South America**, Latin America’s largest solar energy trade fair, reinforces our leadership in the sector. Additionally, our CEO was featured in **Forbes Under 30**, recognized as one of Brazil’s top entrepreneurs. We continue expanding our reach through **strategic partnerships** and a **growing team**. We cultivate a dynamic and collaborative environment where every individual can develop their potential and contribute to a more sustainable future. We are a diverse team spread across Brazil, working in a hybrid model, with an incredible space to exchange ideas, learn, and experience the **77 culture** up close. **If you want to join this mission and transform the energy market with us, check out our opportunities!** #VemSer77