T‑Systems is part of the Deutsche Telekom Group, with around 30.000 employees worldwide. We create technology with purpose to generate a positive impact on society. We are looking for curious talent, eager to learn, take on challenges, and contribute ideas that transform our customers’ experience.

We trust people: we offer autonomy, continuous support, and a collaborative environment where you can grow without limits. We are one global team, guided by respect, integrity, and a passion for doing better every day.

Job Description You will shape and operate around 64 critical tools used across B2B and wholesale customer connection processes, geo‑based network offer planning, calculation and order prozesses. Your work directly impacts how fast and reliably we connect customers to the digital world. Other tasks include the creation of individual tests, which are then kept up to date.We offer a diverse technical environment ranging from the remaining assistants to container‑based workflow systems and virtual machines – adecuado for engineers who enjoy modern tooling while shaping the next generation of our platform.

Responsibilities and Duties

Mercury (NOR-Pass existing)

Activity description and concrete tasks:

As we retire more and more of our legacy front‑end assistants (FEA), our landscape is shifting toward a streamlined set of modern workflow and service components.

Design and implement features,



enhance existing services, update components such as the geo‑server and Mercury plugins, create automated tests, and contribute reusable modules for our global engineering ecosystem.

Qualifications Must-have requirements

Proven experience with Java

Experience with Vue.js, Nuxt, and CSS / SCSS

Solid understanding of Linux and CaaS environments

Experience with PostgreSQL is a plus

High reliability and strong quality mindset

Self-driven, proactive work style with clear communication

Strong team collaboration skills

Experience with testing tools such as Selenium, Gherkin, PyTest, Playwright, or Supertest / Jest is a plus

Additional Information Work environment & flexibility

International, dynamic and collaborative environment

T‑Social: social initiatives (sports, community, health, ...)

Wellbeing & time off

26+ working days of vacation per year

Free access to specialist services (medical, legal, wellness)

100% salary coverage during medical leave

Telemedicine Life and accident insurance Social fund

Customized training: access to Coursera to learn whatever you want, whenever you want

Weekly language classes (English, Spanish & German)

International Mentoring Sessions & Experience Days

And many more advantages of being part of T-Systems!

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📌 Full-stack Developer (m/f/d) (Madrid)
🏢 T-Systems Iberia
📍 Madrid