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- Work mode
- Hybrid, / Madrid
- Contract
- Internship contract, part-time hours
- English
- Required
- Education
- University degree
Visa options
The ad rules out sponsorship
The advert says visa sponsorship isn’t available for this role.
Skills
This job advert was originally written in Spanish.
Requirements
What we're looking for
- Students of Computer Engineering, Telecommunications Engineering, or similar.
- Possibility of signing an internship agreement with your educational center or through our external collaborator.
- English B2.
- Above all, a desire to learn and contribute.
Pay & benefits
What you'll get
- Modality: Hybrid. In-person on Tuesday, Wednesday, and Thursday at our Madrid offices (Chamberí area) and Monday and Friday via remote work.
- Duration: 3 months. (evaluating continuity)
- Study grant based on dedication (proportional to weekly hours), according to the internship agreement.
- Great growth possibilities in a real, dynamic learning environment with the possibility of participating in relevant projects.
- Mentoring and support from the team.
The role
AtZaleos we develop software forreal-time communications (RTC) systems.
Our mission is clear: to help companies guarantee secure, stable, and always-available communications.
We work in critical environments where reliability is not optional:
Voice AI: we improve the telephony layer of conversational agents and intelligent voice platforms.
Enterprise communications: we develop software for VoIP, CPaaS, and cloud PBX platforms.
Emergency systems: extensive experience designing and developing the Core Services for emergency call networks in the USA.
Since2015,we have helped companies across different sectors keep their RTC communications always up and running, with a culture centered on engineering, quality, and technical responsibility.
A student >who wants to do their internship with us, who feels aligned with our business values and, above all, who wants to grow and develop their professional career at Zaleos.
What you'll do
- Development of software skills for telecommunications: SIP / IMS protocols.
- Software development with high quality standards. Development of systems and DevOps skills (Linux, Docker, CI).
- Use of Open Source tools and libraries in a GNU/Linux environment.
- Participation in team dynamics: meetings, presentations, pair programming, agile methodologies.
- Participation and learning in a high technical level environment oriented towards software quality and process efficiency.
Above all, you will have the opportunity to learn in a real environment, participating in projects that generate impact and working hand-in-hand with experienced professionals.
How we work
At Zaleos, we take engineering seriously. Our culture combinesprinciples Agile, Lean, and DevOps, with an obsession for technical resilience, architectural clarity, and continuous improvement.
Our technical principles—The Tao of Zaleos— are the foundation of everything we do:
Resiliency – Always up, always ready.
We design for fault tolerance and continuous availability.Strategic Modularity – Low Coupling, High Cohesion.
We create clear, cohesive modules with minimal dependency.Immutability – Certainty through consistency.
We automate and control everything that is deployed, without improvisation.Everything as Code – What is not version-tracked is lost.
Everything important is under version control.Pragmatism – Effective solutions over perfect ideals.
We prioritize useful solutions over perfect ones.
Why Zaleos?
Because hereengineering has purpose. Every project has animpact>on our customers' real-time communications> and ensures the world's critical communications keep working.
If you are passionate about technology, motivated by technical challenges, and value quality over quantity, this is your place.
About Zaleos
Zaleos is a Spanish technology company specializing in digital identity verification and fraud prevention solutions. The company provides businesses with tools to verify customer identities, manage compliance, and reduce fraud through advanced analytics and automation. Zaleos operates primarily in the Spanish market, serving clients across banking, fintech, and other regulated industries, and has established itself as a recognized player in the identity verification space.
- Employees
- 100
- Headquarters
- Madrid, Spain
- In Spain
- Madrid
Good to know if you are moving
- Zaleos is headquartered in Madrid, offering a central location in Spain's capital with a growing tech ecosystem.
- The company operates in the identity verification and fraud prevention sector, which is highly relevant for professionals with backgrounds in cybersecurity, data, and compliance.
- As a Spanish company, Zaleos provides an opportunity to work in a local environment while engaging with international clients and regulations.
- The company uses Personio for its careers page, indicating a structured HR process that may be familiar to international applicants.
In their own words
About the company & team
At Zaleos, we share a culture based on trust, autonomy, and technical excellence. Each team member acts with responsibility and professional judgment, providing solutions and caring for product quality.
Our values:
Total Integrity
Transparency, responsibility, and trust, even when things are not going well.Ownership
Each person acts with autonomy and a sense of ownership over their work.Excellence
We deliver clean, stable, and maintainable systems that we can be proud of.
Location
Zaleos · Madrid
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