Senior Backend Engineer (TS, NestJS, AWS) - Own & Modernize

Qulix Systems; Wrocław; On-site; PLN 180,000 - 260,000; Full time

Job summary

Qulix Systems is seeking a Senior Backend Developer (TypeScript + NestJS + AWS) in Poland/Europe to own delivery of central platform services and drive ongoing modernization of the architecture.

You will build features, dive into legacy code, and take operational responsibility for your services, ensuring stability and ongoing improvements across the stack. The role emphasizes pragmatic problem solving and cloud/DevOps proficiency.

Qualifications

• Senior-level expertise in TypeScript, NestJS, and AWS.
• Experience with production cloud systems and troubleshooting.
• Proven track record migrating legacy code to modern architectures.
• Able to take end-to-end ownership of services.

Responsibilities

• Build new features and backend services while modernizing legacy architectures.
• Dive into existing code to understand, support, and upgrade it.
• Take operational ownership and analyze production systems for stability.
• Independently troubleshoot production applications and resolve issues.
• Propose architectural and process improvements.

Skills

TypeScript

NestJS

AWS

DevOps practices

Job description

Qulix Systems is seeking a Senior Backend Developer (TypeScript + NestJS + AWS) in Poland/Europe to own delivery of central platform services and drive ongoing modernization of the architecture.

You will build features, dive into legacy code, and take operational responsibility for your services, ensuring stability and ongoing improvements across the stack. The role emphasizes pragmatic problem solving and cloud/DevOps proficiency.