Senior Backend Engineer (Java & Node.js) for AI Tools

Randstad Polska Sp. z oo; Kraków; Hybrid; PLN 200,000 - 320,000; Full time

Benefits offered by this job

B2B contract

Hybrid Work Model

Working hours 9:00–17:00 CET in Kraków

Job summary

Randstad Polska Sp. z oo in Kraków is seeking a Senior Software Engineer (Dual Backend) to design, build, and maintain high-performance internal engineering platforms and developer tooling supporting Future State Architecture initiatives.

You will split backend responsibilities between Java and Node.js (TypeScript) while integrating Agentic AI, MCP and autonomous developer workflows. You will work in a hybrid Kraków environment, collaborating with global teams to orchestrate APIs, ensure

Qualifications

• 7+ years of backend engineering experience in Java and Node.js (TypeScript).
• Deep PostgreSQL data modeling and scalable API design.
• Experience building internal developer platforms or tooling for enterprise architecture.

Responsibilities

• Design, build and maintain internal tooling supporting Future State Architecture initiatives across CTO platforms.
• Develop backend services and APIs using Node.js and/or Java.
• Integrate applications with PostgreSQL and other enterprise data sources.
• Collaborate with architects and stakeholders to translate business needs into technical solutions.
• Contribute to code reviews, DevOps practices, and operational support.

Skills

Java

Node.js

TypeScript

PostgreSQL

API design

Backend architecture

DevOps (CI/CD)

Job description

Randstad Polska Sp. z oo in Kraków is seeking a Senior Software Engineer (Dual Backend) to design, build, and maintain high-performance internal engineering platforms and developer tooling supporting Future State Architecture initiatives.

You will split backend responsibilities between Java and Node.js (TypeScript) while integrating Agentic AI, MCP and autonomous developer workflows. You will work in a hybrid Kraków environment, collaborating with global teams to orchestrate APIs, ensure