Senior Software Developer (Brazil, Remote)

Description
Magentrix builds customer portal and partner relationship management (PRM) software for mid-market companies, integrated with Salesforce, Microsoft Dynamics and HubSpot.
We are hiring a Senior Software Developer to build and evolve the core Magentrix platform. You will work across a .NET / .NET Core backend and a Vue.js + Tailwind CSS frontend. AI-assisted development is central to how this team works: you will use Claude Code daily to design, build, test and ship features faster without lowering quality or security.
Role Details
Location: Fully remote, candidates based in Brazil only
Status: Full-time
Key Responsibilities
Platform Development
Design and build new product features end to end, from C# / .NET Core services and APIs to Vue.js interfaces.
Maintain and modernize existing .NET Framework code, including migration work toward .NET Core.
Build responsive, consistent UI components with Vue.js, TypeScript and Tailwind CSS.
Design data models and queries using SQL Server or PostgreSQL and Entity Framework.
Build and maintain REST APIs and integrations with Salesforce, Microsoft Dynamics and HubSpot.
AI-Assisted Engineering
Use Claude Code as a core daily tool for coding, refactoring, debugging, test generation and documentation.
Review, verify and own all AI-generated code before it ships.
Help shape team practices for AI coding: prompts, project context files, custom commands and review standards.
Prototype and evaluate AI-powered product features.
Quality & Security
Write clean, tested, maintainable code following secure coding practices across the SDLC.
Take part in code reviews, with attention to performance and security.
Troubleshoot production issues and resolve defects.
Report security incidents or vulnerabilities promptly, in line with company policy.
Collaboration
Work with product, UX and Professional Services to turn requirements into working features.
Contribute to technical design decisions and sprint planning in an Agile team.
Required Skills & Qualifications
7+ years of professional software development experience.
Bachelor's degree in Computer Science or a related field, or equivalent experience.
Expert-level C# with strong experience in both .NET Framework and .NET Core / modern .NET (ASP.NET MVC, Web API).
Strong experience with Vue.js (Vue 3 preferred), TypeScript, JavaScript, HTML5 and CSS3.
Hands-on experience building UIs with Tailwind CSS.
Extensive, hands-on experience with AI coding tools, especially Claude Code, used as part of a daily workflow on real projects. Be ready to show examples.
Solid SQL Server or PostgreSQL skills and experience with Entity Framework or another ORM.
Strong grasp of OOP, design patterns (MVC, dependency injection) and RESTful API design.
Working knowledge of secure coding principles (OWASP Top 10, authentication and authorization).
Experience with Git, code reviews and Agile delivery.
Clear written and spoken communication.
Nice to Have
Experience migrating applications from .NET Framework to .NET Core.
Experience with Claude Code customization: CLAUDE.md files, custom slash commands, hooks, subagents or MCP servers.
Experience building LLM-powered features (RAG, chatbots, agents) using the Anthropic or OpenAI APIs.
Experience with Salesforce, Microsoft Dynamics or HubSpot APIs.
Background in multi-tenant SaaS, customer portal or PRM products.
Familiarity with CI/CD pipelines and cloud hosting (Azure or AWS).
What We Offer
Company-provided Claude Code access and time to explore new AI tooling.
Direct impact on a product used by mid-market companies.
All staff must follow Magentrix information security policies and complete ongoing security awareness training.

Work arrangement
Yes