Senior Software Engineer (Back End) - Plataforma WLv2

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Software Engineer Senior (Back End) - Plataforma WLv2 based in Brazil.

This role is an opportunity to join a high-impact fintech environment building a scalable, multi-tenant and multi-product financial platform powering corporate expenses and benefits solutions. The engineer will work on a modern backend architecture built in .NET 10, leveraging event-driven patterns, distributed processing, and cloud-native AWS services. The position involves designing and evolving complex financial workflows, ensuring reliability in a regulated domain. It is ideal for someone who thrives in distributed systems, enjoys solving deep architectural challenges, and values clean, maintainable code at scale. The environment is highly collaborative, with strong engineering standards and a focus on continuous delivery. You will contribute directly to the evolution of a platform used by large ecosystems across multiple industries.

Accountabilities

• Develop and evolve backend services for a multi-tenant, multi-product fintech platform built in .NET 10.
• Design and implement event-driven architectures using AWS (SQS, SNS) and messaging frameworks like MassTransit.
• Build and maintain scalable APIs using ASP.NET Core, supporting authentication, versioning, and middleware pipelines.
• Implement domain-driven and CQRS-based architectures with clear separation between commands, queries, and modules.
• Work with MongoDB to design document-oriented data models, indexes, and aggregation pipelines.
• Develop and maintain background processing workflows using Hangfire and distributed systems patterns.
• Collaborate with cross-functional teams to ensure system reliability, performance, and regulatory compliance.
• Contribute to system design decisions, technical documentation, and architectural evolution of the platform.
  
  

Requirements

• Strong experience with .NET 10 / C#, including async programming, LINQ, generics, and modern language features.
• Solid expertise with ASP.NET Core (controllers, middleware, filters, versioning strategies).
• Hands-on experience with MongoDB, including data modeling, aggregations, and performance optimization.
• Strong understanding of CQRS and Mediator patterns, including pipeline behaviors and separation of concerns.

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• Experience with MassTransit, AWS SQS/SNS, event-driven architectures, and distributed messaging.
• Knowledge of Hangfire or similar background job processing tools.
• Familiarity with DDD, Hexagonal Architecture, and modular/multi-tenant systems.
• Experience with AWS services (S3, Cognito, messaging infrastructure).
• Strong understanding of software quality practices, including unit testing (xUnit, Moq), FluentAssertions, and static analysis tools (SonarQube).
• Experience writing clean, well-documented code with OpenAPI/Swagger standards.
• Ability to work with distributed systems, asynchronous processing, and complex business rules.
  
  

Nice To Have

• Experience in fintech, payments, banking systems, or regulated financial environments.
• Knowledge of compliance topics such as LGPD or financial regulations.
• Experience with Redis, Docker, CI/CD pipelines, and observability tools.
• Exposure to .NET major version migrations or large-scale system modernization.
• Experience with API integration workflows, webhooks, and financial reconciliation systems.
  
  

Benefits

• Competitive PJ contract arrangement.

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• 100% remote work model.
• Extended healthcare coverage (including dependents, no monthly fee or copay).
• Dental assistance plan.
• Flexible meal/food allowance (Swile card).
• Childcare assistance for parents of young children.
• Financial support for parents of children with disabilities.
• Group life insurance coverage.
• Partnerships with wellness platforms (e.g., gym and wellbeing benefits).
• Travel and lifestyle partnership benefits.
• Learning-oriented environment with strong engineering culture and growth opportunities.
  
  

How Jobgether Works

We use an AI-powered matching process to ensure your application is reviewed quickly, objectively, and fairly against the role's core requirements. Our system identifies the top-fitting candidates, and this shortlist is then shared directly with the hiring company. The final decision and next steps (interviews, assessments) are managed by their internal team.

We appreciate your interest and wish you the best!

Why Apply Through Jobgether?

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We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.