Senior Backend Developer

About the role & project

Work with a partner on a next-generation passwordless authentication platform used by millions worldwide. The product focuses on secure digital identity, combining biometrics, document verification, and data processing to enable seamless, one-tap access. Security is central to the product.

The Senior Backend Engineer takes end-to-end ownership, from design and implementation through to production. The role involves building systems where performance, scalability, and security matter, with a hands-on focus on strong engineering fundamentals, quality, autonomy, thoughtful engineering, and production behavior.

The work model is hybrid, with regular in-office syncs to stay aligned as a team.

Preferred Skills & Qualifications

• 6–8+ years of commercial experience as a backend or backend-focused full-stack developer
• Strong proficiency in TypeScript
• Solid experience with Node.js (NestJS)
• Good understanding of secure backend design principles, including authentication, authorization, data protection, and API security
• Experience with GCP or other cloud platforms
• Strong knowledge of SQL and NoSQL databases
• Solid understanding of HTTP, REST APIs, and web communication patterns
• Experience with backend testing frameworks and testing strategies
• Ability to use AI tools effectively and responsibly in day-to-day development
• Very good command of English and Polish

What you will find

• Real ownership and influence on the products you build
• Focus on business value over technical perfection
• Continuous feedback and open communication
• Regular 1:1s and a mentoring program to support growth
• Internal workshops and knowledge sharing across teams
• Flexible working hours, with start times between 7:00 and 10:00
• Hybrid model with regular in-studio syncs twice a month
• High-quality equipment, including a MacBook and testing devices
• Individual training budget
• English classes in small groups

Benefits

• Private medical care (Compensa)
• MultiSport
• Team gatherings and shared moments beyond work