**Location:**Barcelona, CT, ES **Professional Profile:** Defense and Security **Required Experience:** More than 2 years of experience **Work Mode:** Hybrid **At Indra Group, we protect what matters most.** We lead the development of cutting-edge technological solutions that strengthen national and international security. Join our European projects team! As part of our positioning as a leading company in the defense sector, we aim to reinforce our team with a **C# .NET Backend Developer**, to join a strategic R&D project. **What will you do?** ✅ **Design and develop** core solutions for orchestrating multi-domain **WHAT-IF** scenarios. ✅ Implement **request/response-oriented services** and event-driven applications. ✅ Collaborate on **service integration and exposure** in distributed environments. ✅ Contribute to the development of **real-time simulation systems**. ✅ Work with architectures based on **Docker** and **Kubernetes**. ✅ Integrate technologies such as **gRPC (protobuf)** and **PUB/SUB** systems (NATS, Kafka, Solace). ✅ Ensure **code quality** and good practices in structured programming. **What are we looking for in you?** **Backend development experience with C# and .NET**. Valuable knowledge in: * Real-time simulation systems. * Development of request/response services. * Containers and orchestration (**Docker, Kubernetes**). * Event-driven applications and structured programming. * **gRPC** protocols and **PUB/SUB** systems (NATS, Kafka, Solace). Education in **Engineering** or **Higher Vocational Training in Programming**. Advanced English (spoken and written). Prior experience in the video game industry or similar environments will be valued. Certifications in related technologies are a plus. **What we offer you** **Stability and Future**: Long-term projects at a leading defense company with over 50,000 professionals. **Innovative and High-Impact Projects**: You’ll work with cutting-edge technologies, with national and international impact. **Close and Transparent Environment**: Direct communication and collaborative atmosphere. **Autonomy and Flexibility**: Hybrid model adapted to your pace. **Personalized Career Plan** and **continuous training** (Open University, Udemy for Business). **Exclusive Benefits**: Discounts on gyms, leisure, restaurants, and more. **Competitive Compensation** and flexible reward plans. **How does our selection process work?**Profile review * : We assess your experience and skills to determine if you match our requirements. First contact (5–10 min) * : If you receive a call from an unknown number, it’s our team! It will be a quick conversation to get to know you and address any questions. Technical interview : You’ll meet the team, who will explain the project and daily tasks. We’ll also explore your technical knowledge. Additionally, brief psychological and English competency tests may be conducted (if necessary). Offer and welcome * : If everything goes well, you’ll join our team and begin this new stage together! **Estimated Time: 1–2 weeks.** *Our commitment is to foster workplaces where people are treated with respect and dignity, promoting professional development of staff and ensuring equal opportunities in recruitment, training, and promotion, offering a work environment free from discrimination based on gender, age, disability, sexual orientation, gender identity or expression, religion, ethnicity, marital status, or any other personal or social circumstance.* INDRA is a Top Employer 2025! Join a company certified as one of Spain’s best employers, thanks to our comprehensive HR management and the conditions we offer our professionals.