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Staff Engineer - .NET/AI

WEX Inc.

Job Overview

Location

Brazil - Remote

Job Type

Full-time

Full Job Description

📋 Description

• As a Staff Engineer - .NET/AI at WEX Inc., you will play a pivotal role in building the next generation of employer benefits solutions by combining deep software engineering expertise with emerging AI technologies to solve complex business problems.
• Day to day, you will collaborate with stakeholders to understand customer challenges, design and implement scalable microservices using C# and .NET, develop AI-powered features including RAG-based applications and agentic workflows, write comprehensive tests, monitor production systems, and mentor peers while driving technical excellence across distributed teams.
• You will join WEX’s Benefits Technology team, which focuses on simplifying benefits administration for clients through innovative, reliable, and secure technology solutions, operating in a collaborative, agile environment that values ownership, continuous learning, and technical leadership.
• In this role, you will deepen your expertise in cloud-native development, AI integration, and distributed systems while gaining hands-on experience with cutting-edge technologies like LangChain, vector databases, and the Model Context Protocol, positioning you as a technical leader in AI-enabled enterprise software.

🎯 Requirements

• Strong hands-on experience in software development, architecture, deployment, and production operations using modern backend languages such as C#
• Proficiency in React and experience building and consuming REST APIs
• Experience with cloud platforms (AWS/Azure), Kubernetes, Docker, and CI/CD pipelines
• Familiarity with LLM concepts, RAG-based applications, vector databases (e.g., Pinecone, Milvus), and agentic workflows including tool use and state management
• Proven ability to lead and mentor engineering teams, communicate technical trade-offs effectively, and collaborate across geographically distributed teams

🏖️ Benefits

• Opportunity to work on innovative AI-powered benefits solutions at scale
• Remote work flexibility based in Brazil
• Exposure to cutting-edge technologies including LangChain, Kubernetes, and cloud-native AI frameworks
• Culture of continuous learning and professional growth in AI and cloud technologies
• Collaborative, agile environment with emphasis on ownership, mentorship, and technical excellence

Skills & Technologies

React

ASP.NET

PostgreSQL

MySQL

MongoDB

Senior

Remote

Degree Required

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WEX Inc.

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About WEX Inc.

WEX Inc. is a global commerce platform headquartered in Portland, Maine, providing payment processing and business solutions across fleet, travel, and healthcare sectors. Founded in 1983, the company offers fuel cards, corporate payments, virtual cards, and benefits administration technology that simplifies complex transactions, enhances security, and delivers data-driven insights for businesses of all sizes. WEX serves customers in North America, South America, Asia-Pacific, and Europe, enabling efficient fleet operations, streamlined travel booking, and improved healthcare benefit management through innovative payment systems and software.

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