Sonia

Senior Full-Stack Engineer (all) at Sonia. We’re looking for a Senior Full-Stack Engineer to help us build modern, high-performing web applications. You’ll play a key role in shaping our architecture, mentoring team members, and contributing to the scalability of our product.

Responsibilities

• Design and implement robust, scalable full-stack web applications
• Write clean, maintainable, and testable code following best practices
• Collaborate on architecture decisions and long-term technical planning
• Optimize application performance and improve system reliability
• Mentor junior developers and support their growth
• Conduct code reviews and share constructive feedback
• Contribute to technical documentation and knowledge sharing

Qualifications

• 8+ years of professional software development experience
• Strong expertise in TypeScript / JavaScript and Node.js
• Proven experience with React and modern front-end development
• Solid understanding of full-stack development principles
• Hands-on experience with ORM tools, especially Prisma
• Experience in backend development with Node.js
• Familiarity with RESTful API design and implementation
• Understanding of CI/CD pipelines
• Proficiency with Git version control
• Experience with database design and data modeling

Nice to Have

• Experience with Remix or other SSR frameworks
• Familiarity with Chakra UI
• Experience with testing frameworks (e.g., Playwright, Vitest)

Benefits

• An engineering-driven culture with modern tools and clean code practices
• A product-focused environment where quality and performance matter
• A collaborative team that values learning, pragmatism, and ownership
• Attractive compensation aligned with your skills
• Flexible work arrangements, full remote within Germany or Luxembourg possible
• 30 days of vacation per year

About the role

If you're passionate about web development and want to work with cutting-edge technologies, we'd love to hear from you!

I'm Margarita and will be guiding you through the application process.