📍Office : Toulouse ⏳Length : 6 months 📅Start date : February/March 2026 💰Compensation : Paid internship 🌍Who are we ? We are CYSEC, a fast growing European information security company based in Luxembourg, Switzerland, France and Italy. We bring security solutions to protect sensitive information and datalinks, on Earth and in Space. We develop and offer three different innovative products securing: 🛰️ARCA SATLINK - The space data link between the Ground Station and the Satellite 📡ARCA SATCOM - The satcom link providing internet connectivity to end users through satellites 💻ARCA Trusted OS - IT execution environments on untrusted or third party infrastructures We’re a team of engineers and software security experts, combining deep technical expertise with hands-on industry experience. Our mission is to deliver agile, cutting-edge security solutions tailored for even the most exotic infrastructures and we're always ready to tackle the toughest challenges. As a proud multinational and multilingual team, we believe that true innovation and excellence are driven by diversity and inclusion. Join us in shaping the future of cybersecurity. Find out more at: www.cysec.com 🔎Context ARCA SATLINK is a two-part solution, ARCA SATLINK Ground and ARCA SATLINK Space are designed to secure communications between ground stations and satellites. It leverages the state-of-the-art CCSDS Space Data Link Security Protocol to protect space data links. With the rapid growth in satellite deployments, securing telecommands, telemetry and payload communications has become more critical than ever. In this role, you’ll contribute to the development of advanced cryptographic software that safeguards the data exchange between satellites and ground infrastructure. 🎯Your Mission Join us in contributing to the development of our ARCA SATLINK solution. 👩💻What We’re Looking For Are you an experienced developer with a passion for space and security? Are you motivated, result-driven, and excited by the opportunity to bring innovation to the fast-evolving space ecosystem? If so, we want to hear from you. ✅Core proficiency: Strong programming skills in C and/or Rust, with attention to memory safety, concurrency, and performance Experience with embedded / low-level development (cross-compilation, working with constrained or real-time systems) 🛠️Comfortable with: Git APIs Docker Secure coding practices 🌟Nice to have: Unit testing & fuzzing for cryptographic code FPGA / Xilinx hardware experience Knowledge of applied cryptography (encryption, authentication, key distribution) If you're ready to take your skills to orbit and help shape the future of secure space communications, this role is made for you. 🤝Work environment & your Team You'll be joining a team of passionate engineers with a strong background in security and software development. Collaboration, curiosity, and a problem-solving mindset are at the core of how we work. We're deeply committed to delivering high-quality, secure solutions and we do it together, supporting each other every step of the way. At the same time, you’ll be in an environment that encourages continuous learning, hands-on experience, and meaningful contributions to impactful projects. Our office is based in the heart of Toulouse, easily accessible by public transport and surrounded by delicious lunch spots and after-work hangouts making it a vibrant and enjoyable place to work. 🔥 Our benefits 🍽️ Meal vouchers 🚇 100% reimbursement of public transport subscription 🏋️ Access to the building’s gym ☕ Coffee machine available for your daily caffeine boost