Senior FullStack Developer (P-168)

SMASH, Who we are? We are agents for tech professionals in Costa Rica and Colombia that help them build careers in the United States. We believe in long-lasting relationships with our talent. We invest time getting to know them and understanding what they seek as their professional next step. We aim to find the perfect match. As agents, we pair our talent with our US clients, not only by their technical skills but as a cultural fit. Our core competency is to find the right talent fast. We purposefully move away from the “contractor” or “outsourcing” type of relationship. Our clients don’t want contractors or “just a service.” Neither does our talent. Our Benefits Wellness Coverage Remote Work Birthday day off Recognition and rewards system Referrals Program Business skill coaching English classes for Smashers and relatives Learning opportunities This position is Remote to work with a US Company; you will require to have Citizenship or a work permit from CR, COL or Argentina to apply for this role. Role summary You will design, develop, and modernize enterprise web and desktop applications while providing technical leadership across the software development lifecycle. This role combines full-stack development, architecture, DevOps, and customer collaboration to deliver scalable, high-quality solutions using modern Microsoft and JavaScript technologies. Responsibilities Design, develop, and maintain enterprise web and desktop applications using .NET Core, Flask, Express.js, Angular, and Electron. Build responsive, scalable, and user-friendly front-end applications. Develop robust backend services and RESTful APIs. Design and optimize SQL Server, PostgreSQL, and MongoDB databases. Write clean, maintainable, and scalable code using C#, Python, JavaScript, and TypeScript. Lead technical design discussions and mentor junior developers. Perform code reviews and promote engineering best practices. Develop third-party integrations and ensure reliable interoperability between systems. Optimize application performance, scalability, security, and maintainability. Support production deployments, customer implementations, and critical software releases. Contribute to CI/CD pipelines, deployment automation, and DevOps initiatives. Utilize AI-assisted development tools such as GitHub Copilot, Cursor, Claude, or similar to improve development efficiency. Collaborate with cross-functional teams and participate in customer technical discussions when required. Stay current with emerging technologies and recommend improvements to products and engineering practices. Requirements – Must-haves Bachelor's degree in Computer Science, Information Technology, or a related field. 8+ years of Full Stack software development experience. Strong experience with .NET Core, Flask, and Express.js. Advanced experience with Angular (React experience is also valuable). Experience developing desktop applications with Electron. Strong programming skills in C#, Python, JavaScript, and TypeScript. Experience with SQL Server, PostgreSQL, and MongoDB. Experience designing and consuming RESTful APIs. Experience with Git and Azure DevOps. Experience with microservices architecture. Hands-on experience with Docker and Kubernetes. Strong understanding of software architecture, code quality, testing, and CI/CD practices. Excellent analytical, communication, and leadership skills. Nice-to-haves (optional) Experience with Microsoft Azure cloud services. Experience with AI-assisted development tools (GitHub Copilot, Cursor, Claude, ChatGPT, etc.). Experience supporting customer implementations and production environments. Experience in the travel and transportation industry. Languages English C1 Spanish C1