Senior Software Engineer (Platform & Backend)

Alongside is a Portuguese company that partners with international organizations to build and scale exceptional tech teams. Our client is a fast-growing SaaS company transforming the automotive dealership experience by automating administrative processes, streamlining sales workflows, and ensuring compliance. They are looking for a highly experienced Senior Software Engineer (Platform & Backend) to join their fully remote team. This is a hands-on engineering role for someone who enjoys solving complex technical challenges, taking ownership of architecture, and leading technical initiatives across the entire stack. This is not a people management role . Instead, you’ll act as a technical leader, driving architecture, owning critical parts of the platform, and leading projects from design through production. Responsabilities: Own and evolve major parts of the application architecture. Design, build and maintain scalable software across backend, frontend and infrastructure. Lead technical projects from design through production. Make architectural decisions and drive technical direction. Build and operate production systems with a strong focus on reliability, scalability and performance. Review code and promote engineering best practices. Troubleshoot production issues and improve platform resilience. Collaborate closely with product and engineering teams to deliver high-impact features. Extensive experience building and scaling SaaS products. Strong expertise in TypeScript , with solid experience across backend, frontend and cloud infrastructure . Strong backend engineering experience. Experience operating and maintaining production infrastructure in cloud environments. Proven experience designing software architecture and leading technical projects. Previous experience as a Tech Lead, Staff Engineer, Principal Engineer or Senior Software Engineer with architectural ownership . Comfortable working across the full stack and taking ownership from infrastructure through backend to frontend. Experience with AWS, Pulumi, Bun, React, Vite, GraphQL, PostgreSQL and Redis is a plus. Excellent communication skills and the ability to work autonomously in a fast-paced startup environment. Fully remote , based in Portugal. Salary range: 50k – 80k per year