Full Stack Engineer

Infinity Quest; Kraków; Hybrid; PLN 90,000 - 130,000; Full time

Job summary

Infinity Quest Limited is hiring a Full stack Software Engineer in KrakowHybrid, with two onsite days weekly. The role focuses on building internal tooling for future state architecture, backend services, and UI components for architects and engineering teams.

You will work with Node.js/Java, PostgreSQL, and autonomous AI agent orchestration to deliver reliable, secure platforms. Collaborating with global stakeholders, you will ensure security, performance, observability, testing and

Qualifications

• Strong software engineering capability in Node.js and/or Java.
• Relational database expertise, particularly PostgreSQL.
• Web UI development experience (modern JavaScript/TypeScript frameworks).
• Agentic application engineering knowledge, including orchestration of autonomous AI agents.
• Integration patterns (MCP, tool/function calling, API design).
• Production engineering mindset: security, resilience, performance, observability, automated testing.

Responsibilities

• Design, build and maintain internal tooling for Future State Architecture (FSA).
• Develop backend services and APIs using Node.js and/or Java with PostgreSQL integration.
• Build web UI components for architects and engineering teams.
• Apply agentic engineering to orchestrate autonomous AI agents.
• Implement robust integration patterns to connect tools across the architecture.
• Collaborate with architects and stakeholders to translate needs into designs.
• Ensure security, performance, resilience, testing, and documentation.
• Contribute to toolchain improvements and live service operations.

Skills

Node.js

Java

PostgreSQL

API design

AI agents

Security

Observability

English

Job description

Role: Full stack Software Engineer

Role Location: Krakow, Poland (Hybrid) (2 days/week onsite is Mandatory)

Duration: 12 Months Contract with possibility of renewal

Description:-

Roles and RESPONSIBILITIES

• Design, build and maintain internal tooling that supports Future State Architecture (FSA) across CTO Platforms, with a focus on production-grade reliability and usability.
• Develop backend services and APIs using Node.js and/or Java, integrating with relational databases (especially PostgreSQL) and other enterprise data sources.
• Build and enhance web UI components to enable intuitive workflows for architects and engineering teams using the tooling.
• Apply agentic engineering practices to orchestrate autonomous AI agents that can build, test and deploy software, ensuring appropriate controls and observability.
• Implement robust integration patterns (e.g., MCP and tool/function calling) to connect tools safely and consistently across the architecture ecosystem.
• Collaborate with architects, platform engineers and stakeholders to translate future-state architecture needs into clear technical designs and deliverables.
• Ensure solutions meet Client engineering standards, including security, performance, resilience, testing, and documentation expectations.
• Contribute to continuous improvement of the toolchain and ways of working, including code reviews, automation and operational support for live services

SKILLS & EXPERIENCE REQUIRED

• Strong software engineering capability in Node.js and/or Java
• Relational database expertise, particularly PostgreSQL (data modelling, query optimisation)
• Web UI development experience (modern JavaScript/TypeScript frameworks)
• Agentic application engineering knowledge, including orchestration of autonomous AI agents
• Integration pattern expertise (e.g., MCP, tool/function calling, API design)
• Production engineering mindset (security, resilience, performance, observability, automated testing)
• Solution design and architecture skills for internal platforms and tooling
• Strong English communication skills and stakeholder collaboration in a global environment