Technical System Designer

Job description

• 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.

Requirements

• 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.

We offer

• Benefits

Medical care, sports packages, parking at our Marynarska office and a special mobile plan offer are the basics for us. On our benefits platform, you'll find options to take care of your body, soul and mind - but most importantly, you choose what you use!

• Celebrations

You'll get an extra day off for your birthday or name day.

• Referral Program

Through our "Znam Talent" (I Know a Talent) Referral Program, you can invite your friends to work at T-Mobile and earn a bonus for it.

• Responsibility

We love helping others and are involved in many social initiatives. Our commitment has been recognized with, among others, the Polityka weekly's Golden CSR Leaf and in the Responsible Companies Ranking. You can be part of it too, for example through our "Joy of Helping" initiative!