System/Application Architect - One Portal Tribe

Location: Warszawa, ul. Marynarska 12

Type of contract: Direct B2B

Type of cooperation: Hybrid (to be decided)

Recruitment online!

We invite you to cooperate with the international SCRUM team responsible for T-Mobile's self-service business customers, where you will help shape the system’s development strategy by identifying architectural needs, proposing directions for change, and contributing to decision-making.

What tasks await you?

• Translate requirements and acceptance criteria into technical designs that define system behavior, data flows, inter-system contracts, component responsibilities, and error handling.

• Analyze existing code and application behavior to validate proposed solutions and make effective use of proven mechanisms.

• Design solutions in collaboration with business analysts, solution architects, developers, and application administrators, and support the team during implementation.

• Conduct targeted analysis of application and IT infrastructure performance, identify the causes of issues, and recommend optimizations.

• Evaluate new technologies and IT tools, prepare recommendations, and contribute to decisions about their adoption within the system.

• Help strengthen data and system security by designing secure solutions, identifying risks, and coordinating actions with the relevant teams.

• Use AI tools in practice to analyze, design, and document changes, while critically verifying their output.

• Work with other departments to understand their technology needs and agree on the scope of changes.

• Work in an Agile team, solve technical problems, and continuously improve ways of working.

• Document design decisions and communicate the scope of changes, risks, and solution quality to stakeholders.

• Help shape the system’s development strategy by identifying architectural needs, proposing directions for change, and contributing to decision-making.

What skills will be appreciated?

• At least 3 years of experience in the technical design of IT systems or significant architectural changes.

• At least 2 years of hands-on commercial software development experience, with the ability to read code and trace the actual flow of a request through a system.

• Ability to translate acceptance criteria into a feasible technical design that aligns with the system architecture.

• Experience analyzing existing code and designing extensions to established mechanisms.

• Practical knowledge of frontend and backend web application architecture, including data flows between them, REST/JSON contract design, and integration with other systems.

• Ability to design flexible, configurable solutions and assess the impact of changes on related processes.

• Experience diagnosing technical and performance issues and recommending application and infrastructure optimizations.

• Knowledge of authentication, authorization, and data protection principles in application design.

• Hands-on experience using AI tools for code analysis, design, implementation, testing, or documentation, and the ability to critically evaluate their output.

• Ability to clearly document technical decisions and collaborate with analysts, developers, architects, and other stakeholders.

Nice to have:

• Experience with microservices architecture and containerized applications.

• Familiarity with tools for documenting and testing APIs and creating flow diagrams.

• Knowledge of the AI SDLC and principles for safely integrating AI into the software development lifecycle.

• Experience improving team workflows with AI, for example, in code analysis, technical design preparation, or change reviews.