Senior FullStack Developer

Description

Job Summary: We are seeking a Senior FullStack Developer to work in a complex environment involving legacy systems, with a focus on stabilization, evolution, and refactoring of critical integrations. Key Highlights: 1. Experience with legacy systems and critical integrations. 2. Technical accountability and focus on system stabilization. 3. Autonomy to conduct technical analyses and implement solutions. **SENIOR FULLSTACK DEVELOPER** Location Hybrid – São Paulo/SP (3 days per week onsite) Employment Model Contractor (PJ) **About the Challenge** We are looking for a Senior FullStack Developer to work in a hybrid model in São Paulo, within a corporate environment featuring a strong presence of legacy systems and critical integrations undergoing refactoring. This position targets professionals with experience in complex environments, capable of assuming technical accountability and focusing on the stabilization and evolution of existing systems. The main challenge involves maintaining the legacy environment, supporting resolution of issues related to integrations, and contributing to the implementation of new integration processes between platforms—ensuring system stability and availability. The professional will also support Marketing team requests related to institutional websites. **Responsibilities** Maintenance and evolution of legacy systems developed in .NET. Implementation of APIs using Orchestrator and Groovy. Advanced code debugging and root cause analysis of incidents. Fixing failures in system-to-system integrations. Close collaboration with systems teams and business areas. Active participation in technical meetings and prioritization processes. Proposing technical improvements that reduce operational risks and increase application stability. **Technical Requirements** Solid experience with .NET Framework and/or .NET Core. Strong proficiency in C\#. Knowledge or experience with Orchestrator and Groovy. Proven experience with legacy systems. Hands-on experience with integrations using REST, SOAP, APIs, or Web Services. Knowledge of SQL Server, including complex queries, stored procedures, and troubleshooting. Practical experience with debugging and log analysis. Ability to quickly read and understand existing code. Knowledge of WordPress. **Nice-to-Haves** Knowledge of Digibee. Knowledge of Java. **Behavioral Profile** Ownership mindset toward assumed technical responsibilities. High availability and commitment to system stability. Ability to work in a hybrid and collaborative environment. Autonomy to conduct analyses and implement solutions without constant direction. Prioritization ability and performance under pressure. Clear communication regarding technical blockers and risks. Results-oriented and problem-solving focused. Seniority will be assessed primarily based on: Autonomy in conducting technical analyses and implementing solutions. Ability to stabilize critical environments. Reduction of technical escalations. Effective root cause resolution. **Expectations for the First 60 Days** Functional mastery of the system. Technical fluency in integrations. Proactive stance in technical decisions and environment improvements. This opportunity is ideal for professionals who: Have worked in complex environments and successfully organized and stabilized systems. Have experience with legacy systems and critical integrations. Can rapidly assume technical accountability. Seek to work in a technically demanding environment. **Benefits (Contractor – PJ) – FMX** Wellhub: access to gyms and physical and mental wellness programs. Starbem: consultations with psychologists, psychiatrists, nutritionists, and other specialists. Avus: discounts on medications and medical appointments, with coverage for up to 4 dependents at no additional cost. Clube iFood: discounts and benefits at partner establishments. Paid leave, as agreed contractually. Monthly bonus (via iFood Benefícios): recognition for performance and results.