Technical System Designer

MagentaTeam; Województwo mazowieckie; On-site; PLN 180,000 - 240,000; Full time

Benefits offered by this job

Sports packages

Medical care

Life insurance

Free parking and gym at office

Work equipment and phone withUnlimited

Special offers for T-Mobile products

Partner discounts

Company events and well-being programs

Job summary

MagentaTeam in Warsaw seeks a technical designer to translate requirements into robust architectural designs and to analyze existing code for improvements. You will collaborate with analysts, architects, and developers while supporting implementation across frontend and backend systems.

The role emphasizes security, data protection, and the ability to assess impact of changes on processes. You will work within an Agile team to continuously improve delivery and document critical decisions for

Qualifications

• 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 requests through a system.
• Translate acceptance criteria into a feasible technical design aligned with system architecture.
• Experience analyzing existing code and designing extensions to established mechanisms.
• Knowledge of frontend and backend web application architecture, data flows, REST/JSON contracts, and integration with other systems.
• Design flexible, configurable solutions and assess impact on related processes.
• Diagnose technical and performance issues and recommend optimizations.
• Knowledge of authentication, authorization, and data protection principles in design.
• Hands‑on experience using AI tools for code analysis, design, implementation, testing, or documentation.
• Document technical decisions and collaborate with analysts, developers, architects, and stakeholders.

Responsibilities

• 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 solutions and leverage proven mechanisms.
• Design solutions with business analysts, solution architects, developers, and admins, and support implementation.
• Conduct targeted analysis of performance, identify causes, and recommend optimizations.
• Evaluate new technologies and tools, prepare recommendations, and contribute to adoption decisions.
• Strengthen data and system security by designing secure solutions and coordinating with relevant teams.
• Use AI tools to analyze, design, and document changes while critically evaluating output.
• Collaborate with other departments to understand technology needs and scope changes.
• Work in an Agile team, solve technical problems, and continuously improve processes.
• Document design decisions and communicate scope, risks, and quality to stakeholders.
• Shape development strategy by identifying architectural needs and proposing directions for change.

Skills

Technical design

Architectural changes

Code reading

System analysis

Agile collaboration

Documentation

AI integration

Tools

REST/JSON contracts

Frontend & backend architecture

Microservices

Containerized apps

API documentation tools

Flow diagrams

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.

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.

Sports packages, medical care, life insurance - on preferential conditions

Possibility to participate in development webinars, Festiwal Rozwoju, access to learning platforms

Free parking spot and gym at the office (Warsaw, Marynarska), work equipment and phone with an unlimited offer (also for private use), special offer for T-Mobile products, as well as discounts from our partners

Even more magenta: company events, internal contests, well‑being and volunteering programs, Znam Talent - referral program, sports initiatives, DE&I employee resource groups

Our recruitment process

In our recruitment process, you can expect honesty and transparency. We consider each candidacy carefully and fairly, without any exceptions. We don't look at your race, skin color, sexual orientation, gender identity, nationality, disability status, beliefs, appearance or religion. It's your competencies that count.

We also guarantee that you will always receive feedback when participating in recruitment for #MagentaTeam

We will call you to tell you more about this position and to confirm your availability and expectations.

We will invite you to a meeting - this is the perfect moment to verify mutual expectations and get to know each other. We will be happy to get to know what motivates you, hear about your successes and expectations for your new job. During the conversation, you will learn more about our company, team and the tasks we have prepared for you from your direct superior or teammate.

Success? Welcome to T-Mobile!We will give you access to the onboarding platform where you will provide your contract details and learn more about the company. You will also receive all necessary information about your first day and direct contact to your supervisor(s)/buddy. Welcome to #MagentaTeam!