Senior Backend Developer (TypeScript + NestJS + AWS)
Summary
Qulix is hiring Middle+/Senior backend developers in Poland to build, operate, and modernize central platform services in a global accounting environment. Day-to-day work spans TypeScript, NestJS, and AWS, with heavy focus on maintaining legacy code, troubleshooting production systems, and driving sustainable architectural modernization.
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.