Job Summary: A strategic professional to evolve and scale APIs and integrated systems within a high-volume ecosystem, serving as a technical reference and proposing architectural improvements. Key Highlights: 1. Strategic role in the evolution, stability, and scalability of APIs and systems. 2. Strong exposure to real operational challenges with high business impact. 3. Genuine opportunity to influence technical decisions and autonomy to make them. **Job Description:** The new hire will play a strategic role in the **evolution, stability, and scalability** of APIs and integrated systems, operating within a high-volume call ecosystem involving multiple platforms and direct operational dependency. **Responsibilities** * Serve as the **technical reference** for APIs and system integrations. * Develop, evolve, and maintain **REST APIs**, focusing on performance, security, and scalability. * Analyze the impact of changes in environments with **high systemic coupling**. * Actively engage in **incident investigation**, log analysis, and production issue diagnosis. * Collaborate closely with **product, operations, and external partner teams**. * Propose medium- and long-term architectural improvements. * Support technical decisions without requiring constant leadership direction. * Ensure best practices in versioning, observability, and technical governance. **Mandatory Technical Requirements** * Solid experience as a **backend developer**. * Practical experience with: * REST APIs * System integrations * Relational databases (**SQL Server / PostgreSQL or similar**) * Consistent knowledge of: * Version control (Git) * Production environments and deployment pipelines * API security best practices * Ability to **analyze legacy code** and evolve it without disruptive large-scale refactoring. * Experience working in **critical production environments**. **Desirable** * Experience with: * Azure (or similar cloud platform) * .NET / C# * MongoDB or other NoSQL databases * Observability (logs, metrics, tracing) * Environments where **multiple APIs consume each other**. **Behavioral Profile** * High autonomy and strong sense of responsibility. * Clear communication, especially during incidents. * Ability to make pragmatic technical decisions (not “PowerPoint architecture”). * Collaborative mindset—no “hero” or centralizing tendencies. * Comfort operating amid **ambiguity and imperfect systems**. * Ownership mindset focused on stability and business impact. **What Sets This Role Apart** * This is not a “feature factory” position. * Strong exposure to real operational challenges. * High day-to-day business impact. * Direct interaction with internal technical teams and external vendors. * Genuine opportunity to influence technical decisions. **Expected Seniority Level** * We are not seeking someone merely technically faster, but rather someone who: * **Understands systemic impact** * Anticipates problems * Knows when to simplify Type of position: Freelance / PJ Contract duration: 12 months Compensation: R$9,000.00 per month