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Network Engineer - IMS & VoLTE

Remote, Madrid·Added today (last checked 5 Nov)

UST

96 open roles

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Our summary

Hours: Jornada intensiva on Fridays and in summer
Payments: 12 or 14 salary payments a year
Work mode: Remote (Madrid)
Experience: 2+ years
Benefits: Private health insurance, life insurance, flexible pay plan, meal vouchers, gym access

Visa options

The ad doesn’t mention sponsorship
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Skills

Nice to have

Linux

This job advert was originally written in Spanish.

Pay & benefits

What you'll get

-23 working days of vacation, plus December 24th and 31st off.

Numerous social benefits (health insurance, remote work assistance, life insurance, and accident insurance).
Flexible compensation program (meal vouchers, childcare vouchers, transport vouchers, online English classes, health insurance for your family...).
Free access to several training platforms.
Stability and professional career development.
We have an employee referral bonus plan in place.
Possibility to choose to receive your salary in 12 or 14 payments.
Work-life balance measures (flexible hours, remote work, specialist advice (psychologist, nutritionist, personal trainer), intensive workday on Fridays and during the summer, depending on the project).
UST Club platform discounts and gym discounts.

If you want to know more, do not hesitate to sign up and we will contact you to provide more information about the position! We are waiting for you!

At UST, we are committed to equal opportunities in our selection processes and do not engage in any type of discrimination based on race, gender, disability, age, religion, sexual orientation, or nationality. We are committed to disability and support the incorporation of people with a disability certificate.

The role

We are still looking for talent... and we would love for you to join our team!

To get to know us a little better, UST is a North American multinational certified as a Top Employer and Great Place to Work with more than 35,000 employees globally and presence in more than 35 countries. We are leaders in digital technology services and provide large-scale technological solutions to large companies.

What you'll do

We are looking for a Network Engineer specializing in IMS and VoLTE to join the IoT Platforms team of our client, a leader in the telecommunications sector.

The selected person will actively participate in the evolution, operation, and optimization of communication platforms, which support advanced IoT connectivity services, ensuring at all times the availability, performance, and scalability of the network solutions.

You will work in a complex and highly critical technological environment, collaborating with multidisciplinary teams and participating in key projects related to voice and signaling services over mobile networks.

100% remote collaboration from Spain.

Participate in the design and integration of IMS and VoLTE services as part of the Mobile Network Engineering team.
Perform validation tests of the services to be implemented in pre-production environments.
Execute the integration and production deployment of previously integrated and validated IMS/VoLTE services.
Carry out the monitoring of performance, capacity, and availability of the network systems associated with IMS and VoLTE.
Perform analysis, diagnosis, and troubleshooting of network problems in pre-production and production environments.
Collaborate closely with multidisciplinary teams: Core Network, Infrastructure, Security, and Operations.
Prepare and maintain technical documentation, operating procedures, and service reporting.
Contribute to automation initiatives, continuous improvement, and optimization of network operations.
What we expect from you:

Bring from 2-3 years of professional experience

Solid knowledge of IMS (IP Multimedia Subsystem) architectures.

Experience or knowledge in VoLTE / VoIP / SIP.

Knowledge of 4G and 5G Core mobile networks.

Handling of signaling protocols: SIP, Diameter
Knowledge of IP networks: Routing, DNS, NAT, TCP/IP
Experience in trace analysis and network troubleshooting.

Familiarity with Linux environments.

Knowledge of virtualization and Cloud technologies.

Valuable: English B2

Hiring process

3 steps3 interviews1–2 weeks in all

Learning about who you are
With recruitment team
Conversation about your background and experience; for some roles, a sense of your technical proficiency.
Understanding what makes you tick
What motivates you, your working style and personality, and whether you would thrive in UST and client team dynamics.
Final interview
With future peers, sometimes leadership or the client
Informal chat with your future peers about team fit; depending on the role, members of the leadership team or the client may join.

UST replies within 24 hours of the final interview.
Timing depends on everyone's availability.

About UST

UST is a global digital transformation and IT services company headquartered in Aliso Viejo, California, USA. With over 30,000 employees worldwide, UST partners with major corporations across industries such as banking, healthcare, retail, and manufacturing to deliver technology solutions, including cloud, data analytics, and application development. The company has a strong global footprint with delivery centers across North America, Europe, Asia, and Latin America.

In Spain, UST has a significant presence in Málaga, where it operates a technology and innovation hub. The Málaga office is a key delivery center for European clients, offering roles in software engineering, data, and digital services. UST is known for its collaborative culture and investment in employee development, making it an attractive option for international professionals seeking to work in Spain's growing tech ecosystem.

Industry: Technology
Founded: 1999
Employees: 30,000
Headquarters: Alameda, USA
In Spain: Málaga

Good to know if you are moving

UST's Málaga office is part of a growing tech hub in southern Spain, offering a Mediterranean lifestyle with lower cost of living compared to Madrid or Barcelona.
The company provides visa and relocation support for international hires, as part of its global mobility programs.
UST emphasizes continuous learning and offers certifications and training in cloud, data, and engineering.
Málaga has a growing international community and is well-connected by air to major European cities, making it easy for expats to travel.
UST has a diverse workforce with employees from many nationalities, and English is commonly used in the Málaga office.

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