Senior Backend Developer (TypeScript + NestJS + AWS)

Senior Backend Developer (TypeScript + NestJS + AWS)

Level: Senior, Middle

Location: Poland, Europe

• TypeScript
• NestJS
• AWS

We are looking for a skilled Middle+/ Senior Backend Developers to join our team and take delivery responsibility for the further development and operation of a central platform services within the Global Accounting environment.

This role offers the challenge of working with a real-world, established ecosystem. Your scope will include a balance of maintaining legacy services, building new features, and driving the sustainable modernization of its architecture.

We value a pragmatic approach, technical curiosity, and an operational mindset.

What You Will Do:

• Build new features and backend services while sustainably modernizing historically grown architectures.
• Dive into existing legacy code to understand, support, and successfully upgrade it.
• Take operational responsibility for your services, analyzing production systems and ensuring their stability.
• Independently troubleshoot production applications and resolve technical challenges.
• Actively contribute architectural and process improvement proposals.

Must-Haves:

• High seniority level in TypeScript, NestJS, and AWS.
• Practical experience with production cloud systems, DevOps practices, and application troubleshooting.
• Proven track record of working with legacy code, reverse engineering, and migrating older systems to modern standards.
• A realistic, solution-oriented approach to complex, historically grown software architectures.
• Experience taking full end-to-end ownership of existing services.

Nice-to-Have:

• Experience or basic skills in React to help with minor full-stack tasks when needed.