Candidate's location - Latin America (remote)

Role Overview 
We’re seeking a Senior Back-End Engineer to help shape and evolve the core systems that power our platform. In this role, you’ll design and build reliable, scalable, and high-performance services that serve as the backbone of our products. 

You’ll work closely with other engineers, product managers, and front-end teams to transform ideas into production-ready solutions. This is a hands-on role for someone passionate about clean architecture, distributed systems, and modern cloud technologies. 

Key Responsibilities 

• Design and develop robust back-end services and APIs using .NET Core.
• Apply Domain-Driven Design (DDD) and CQRS to structure complex business logic effectively.
• Build and maintain microservices that are scalable, testable, and easy to evolve.
• ​Implement Entity Framework Core for ORM and database management.
• ​Work with both document (e.g., MongoDB, DynamoDB) and relational (e.g., MySQL, PostgreSQL) databases.
• ​Develop serverless and event-driven solutions using AWS Lambda, EventBridge, and queues (SNS/SQS).
• ​Implement efficient caching strategies with in-memory caches and Redis to improve performance.​ 
• ​Package and distribute reusable code via custom NuGet packages and private feeds.​ 
• ​Follow Clean Architecture principles to ensure modularity and maintainability.​ 
• ​Write high-quality unit tests using xUnit and participate in peer code reviews.​ 
• ​Collaborate with other engineers to define and uphold coding standards and best practices.​ 

Qualifications & Skills 

• 5+ years of professional experience building back-end systems with .NET Core. 
• Strong understanding of DDD, CQRS, and Clean Architecture. 
• Proven experience working with microservices and distributed system design. 
• Proficiency in Entity Framework Core and database optimization techniques. 
• Practical experience with AWS Lambda, EventBridge, and message queues (SNS/SQS or similar). 
• Familiarity with caching technologies (in-memory, Redis). 
• Experience building and consuming custom NuGet packages and managing internal feeds. 
• Deep understanding of RESTful API design and versioning best practices. 
• Strong testing background with frameworks such as xUnit. 
• Excellent collaboration and communication skills in a remote-first team. 
• A pragmatic mindset focused on delivering the right solution, not just the perfect one. 

Bonus Points 

• Background in fintech, payments, HR tech, HR benefits, or other compliance-driven industries. 
• Experience with Infrastructure as Code (IaC) tools such as AWS CDK or Terraform. 
• Familiarity with CI/CD pipelines, Docker, and Kubernetes. 
• Experience building or maintaining large-scale event-driven architectures. 
• Exposure to AI-assisted development tools such as Windsurf, Cursor, or similar. 
• Experience developing with MCP (Model Context Protocol) or LLM-based applications