Senior Full Stack Developer – Contractor

About the role

We are looking for a Senior Full Stack Developer to join Kisi’s product team on a contract basis. You will help expand our cloud‑based access‑control platform, building modern web applications that connect people with physical spaces.

Key responsibilities

• Collaborate with product and engineering managers to align development with business goals.
• Architect, design and implement scalable, responsive web applications using modern frameworks.
• Monitor performance metrics and apply web‑performance best practices.
• Identify, fix bugs and performance issues through automated unit, integration and end‑to‑end testing.
• Address security vulnerabilities, apply updates and maintain security documentation.
• Mentor junior developers and interns, conduct code reviews and guide complex tasks.

Required profile

• 5+ years of professional software development experience.
• Strong communication skills, able to explain technical concepts to both technical and non‑technical stakeholders.
• Excellent organizational and project‑management abilities.
• Commitment to continuous learning and staying current with emerging trends.

Required skills

• Ruby
• TypeScript
• Modern frontend development tools (e.g., React, Vue, or similar)
• Experience with relational database systems