About the Role: Key Responsibilities: - Build responsive web frontends using ASP.NET Core MVC or other modern.NET-based web frameworks. - Architect and optimize database structures, indexes, functions, stored procedures and queries using Microsoft SQL Server. - Integrate with external APIs (REST, SOAP) and build automation services for event handling, notifications, data ingestion, and more. - Reference existing Delphi code as needed to understand current workflows and guide development of modern replacements. - Participate in technical planning, code reviews, and remote team collaboration using Git and a structured development workflow. - Own the full delivery of agreed-upon milestones: define your preferred workflow, tools, and daily schedule to meet functional and quality targets. - Provide and maintain your own development environment (PC, IDE, Internet) and bear any operating costs associated with delivering the work. Required Qualifications: - Deep knowledge of Microsoft SQL Server: schema design, stored procedures, functions, indexes, performance tuning, and complex queries. - Hands-on experience with WinUI 3, or strong experience in WPF/UWP and a willingness to work with WinUI going forward. - Proficiency with ASP.NET Core MVC, Razor Pages, or Blazor for web development. - Solid understanding of object-oriented design, async programming, and dependency injection. - Proficiency in JavaScript and jQuery for dynamic front-end functionality in ASP.NET MVC/Razor environments. - Familiarity with background jobs, webhooks, and RESTful service integration. - Familiarity with background services, event processing, and real-time systems. - All project documentation must be exclusively in English. Proficiency in written English is therefore an essential function of this engagement. - Meetings and code reviews can be conducted in Portuguese, so proficiency in spoken English is not mandatory but good to have. - Legally able to invoice as a Brazilian corporate entity and to remit all applicable taxes independently. - Proven track record as an independent contractor or consultant, managing deadlines without direct supervision. - Reliable computer hardware and high-speed Internet suitable for remote development and video calls. Nice to Have: - Exposure to Delphi codebases. - Background in telecom, call center systems, cloud PBX systems, or CRM platforms. - Familiarity with Win32 interop, Chromium integration, or low-level Windows automation. - Familiarity with modern front-end frameworks such as React, Vue, or Blazor. - Experience juggling multiple client projects or running a small software business. Tipo de vaga: Tempo integral, Autônomo / PJ Duração do contrato: 12 meses Pagamento: R$22,00 - R$32,00 por hora Carga horária prevista: no mínimo 30 horas por semana Experiência: - criar e consumir REST APIs (obrigatório) - desenvolvimento frontend com WinUI/MVVM (preferencial) - Microsoft SQL Server (obrigatório) - ASP.NET Core MVC, Razor Pages, ou Blazor (obrigatório) - JavaScript e jQuery (obrigatório) - Delphi (preferencial) Idioma: - Inglês (preferencial)