Our client is a U.S.-based company. They are seeking a highly skilled Senior Software Engineer to design, develop, and optimize the core APIs and data services powering our flagship SaaS platform. This role focuses requires expertise in TypeScript/JavaScript, C#/.NET and Azure cloud development practices. You will also help set technical direction, mentor other engineers, and ensure our software meets the highest standards for performance, scalability, and security.Key Responsibilities:- Design and develop RESTful APIs and backend services using .NET/C# on Azure Web Apps- Model and manage SQL data structures (Azure SQL) to support complex engineering workflows.- Build responsive, accessible UI screens in HTML and TypeScript, leveraging the Webix control platform to deliver clean, maintainable front-end components- Implement security best practices including IAM role configuration, least-privilege access, and API authentication/authorization.- Write and maintain test automation to ensure code quality and reduce regression risk.- Participate in DevOps practices including CI/CD pipeline maintenance, infrastructure-as-code (YAML), and application monitoring using telemetry tools Application Insights and KUSTO language.- Leverage AI-powered assistants and developer tools to reduce repetitive work, improve code quality, and accelerate delivery.- Collaborate cross-functionally with international teams including Product Managers, UX designers, test engineers, and DevOps.- Mentor team members on best practices in software architecture, design patterns, and coding standards.- Conduct code reviews to ensure adherence to established guidelines.Required Qualifications:- BA/BS degree in a technical field or equivalent practical experience- 5+ years of professional experience developing SaaS applications.- 2+ years in .NET/C# for developing RESTful APIs.- 2+ years Web API, JSON, and TypeScript consuming RESTful APIs- Proficiency in version control tools (e.G., Git) and Agile development practices.- Experience with SQL databases such as SQL Server / Oracle- Ability to work independently in short delivery cycles with minimal rework.- Strong understanding of software architecture and design patterns.Preferred Qualifications:- Knowledge of Webix UI platform- Strong experience with Microsoft Azure cloud infrastructure. Certifications beneficial: AZ-204, AZ-900- Experience with DevOps Pipelines, YAML.- Experience using OpenAI or other AI API Platforms- Familiarity with AI-assisted coding tools (Cursor or similar).- Knowledge of monitoring/logging tools (App Insights, CloudWatch, DataDog).- Experience with performance profilingThis is a CLT Role at R$18,000/month