Senior FullStack Engineer (C#/React) - Ecommerce (Brazil)

ABOUT TRUELOGIC At Truelogic we are a leading provider of nearshore staff augmentation services headquartered in New York. For over two decades, we’ve been delivering top-tier technology solutions to companies of all sizes, from innovative startups to industry leaders, helping them achieve their digital transformation goals. Our team of 600+ highly skilled tech professionals, based in Latin America, drives digital disruption by partnering with U.S. companies on their most impactful projects. Whether collaborating with Fortune 500 giants or scaling startups, we deliver results that make a difference. By applying for this position, you’re taking the first step in joining a dynamic team that values your expertise and aspirations. We aim to align your skills with opportunities that foster exceptional career growth and success while contributing to transformative projects that shape the future. OUR CLIENT Leading SaaS platform that provides integrated software solutions for service-based businesses across industries such as Home Services, Health, and Fitness. Supporting over 600,000 businesses globally, our client delivers tools for operations, payments, marketing, and customer engagement. This role is part of one of their products, a highly rated mobile platform that enables contractors to manage estimates, invoicing, payments, and projects from anywhere. JOB SUMMARY We are seeking a Senior Full Stack Software Engineer to help build, enhance, and scale a cloud-native SaaS platform serving a growing customer base. This role will work across the full technology stack, including React frontend development, C#/.NET backend services, AWS cloud infrastructure, APIs, databases, and microservices. The ideal candidate has experience designing scalable multi-tenant SaaS applications, modernizing systems, and contributing to highly available, distributed architectures while collaborating with cross-functional teams to deliver impactful solutions. RESPONSIBILITIES - Design, develop, and maintain cloud-native SaaS applications. - Build and enhance backend services using C# and .NET Core. - Develop modern frontend applications using React. - Design, implement, and maintain RESTful APIs and microservices. - Work with SQL and NoSQL databases to support application functionality and scalability. - Implement, optimize, and maintain AWS-based cloud infrastructure. - Collaborate with Product, QA, DevOps, and Engineering teams to deliver high-quality solutions. - Participate in architectural discussions and technical decision-making. - Mentor junior engineers and promote engineering best practices. - Maintain code quality through testing, code reviews, and continuous improvement. - Improve system performance, scalability, reliability, and operational efficiency. - Support modernization initiatives and cloud-native architecture adoption. QUALIFICATIONS AND JOB REQUIREMENTS - 5+ years of professional software engineering experience. - Strong experience with C# and .NET Core. - Strong experience with React. - Experience designing and developing RESTful APIs. - Experience building and maintaining microservices-based architectures. - Hands-on experience with AWS cloud services. - Strong knowledge of SQL databases such as PostgreSQL or SQL Server. - Experience with NoSQL databases such as MongoDB or DynamoDB. - Experience working with Docker and CI/CD pipelines. - Experience building and supporting SaaS products. - Experience working with multi-tenant architectures. - Strong understanding of software design, scalability, and performance optimization. - Excellent collaboration and communication skills. - Experience with Terraform and Infrastructure as Code. - Experience building serverless applications using AWS Lambda. - Knowledge of event-driven architectures and message queue systems. - Experience with DevOps tooling and cloud automation. - Experience designing and supporting scalable distributed systems. - Experience optimizing application performance an